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Bay Networks 5391 Getting Started Manual

T1 getting started guide
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Remote Annex
T1 Getting Started Guide
Part No. 166-024-851
Rev. A
January 1997

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Summary of Contents for Bay Networks 5391

  • Page 1 Remote Annex T1 Getting Started Guide Part No. 166-024-851 Rev. A January 1997...
  • Page 2 Annex, Remote Annex, Annex Manager, Remote Annex 2000, Remote Annex 4000, Remote Annex 6100, Remote Annex 6300, Remote Annex 5390/Async, Remote Annex 5391/CT1, Remote Annex 5393/PRI, BayStack Remote Annex 2000 Server, Quick2Config, Bay Networks, Bay Networks Press, and the Bay Networks logo are trademarks of Bay Networks, Inc.
  • Page 3 Revision Level History Revision Description Initial release. T1 Getting Started Guide...
  • Page 4 Revision Level History T1 Getting Started Guide...

  • Page 5: Table Of Contents

    Preface About this Guide ................xii Printing Conventions.
  • Page 6 Contents Key AT Command Factory Defaults ............4-4 Hanging Up.
  • Page 7 Figures Figure 1-1. T1 Wiring Scheme ............. . . 1-1 Figure 1-2.
  • Page 8 Figures viii T1 Getting Started Guide...
  • Page 9 Table 2-1. T1-Related Commands ............2-1 Table 2-2.
  • Page 10 Tables T1 Getting Started Guide...

  • Page 11: Preface

    Remote Annex 6100 or a Remote Annex 5391/CT1. Additional information can be found in the Remote Annex 6100 Hardware Installation Guide and the Remote Annex 5391/CT1 Hardware Installation Guide. About this Guide This guide includes the following chapters and appendices:...

  • Page 12: Printing Conventions

    Preface Printing Conventions This manual uses the following printing conventions: Convention: special type special type Return bold italics T1 Getting Started Guide Represents: In examples, special type indicates system output. Bold special type indicates user input. In command examples, this notation indicates that pressing enters the default value.

  • Page 13: Related Documents

    Preface Related Documents Each Remote Annex hardware platform ships with the appropriate hardware guide. The remaining documentation is included with the software. T1 Getting Started Guide xiii...
  • Page 14 Preface T1 Getting Started Guide...

  • Page 15: Introduction

    DS0 channel (digital signal, level 0). The data stream from 24 DS0 channels makes up a T1 signal. This chapter contains a basic description of a T1 digital transmission system, and the role the Remote Annex plays in this type of system. T1 Digital Transmission System T1 was developed to multiplex 24 analog lines.

  • Page 16: Figure 1-2. Typical T1 Transmission System

    Chapter 1 Introduction A T1 digital transmission system typically consists of two T1 terminal devices such as channel banks connected by a T1 line. The channel bank receives signals from up to 24 analog channels; converts each analog signal to a digital signal; multiplexes the digital signal onto a single 4- wire digital T1 line which carries the T1 signal to the other end of the circuit.

  • Page 17: The Remote Annex 6100

    The Remote Annex 6100 The Remote Annex 6100 is a T1 Remote Access server. The Remote Annex 6100 has a T1 engine that, like a channel bank, receives and transmits data and signaling information from 24 channels simultaneously. In the receive direction, data is sent to the T1 engine as a digital T1 signal. The T1 engine passes the data stream to the multiplexor where it is demultiplexed and passed to 24 separate DS0 channels.

  • Page 18: Figure 1-4. Data Flow In The Transmit Direction

    Chapter 1 Introduction In the transmit direction, the serial ports pass digital serial data to the modem. The modem converts the data streams to analog data streams and passes them to a codec. The codec converts the analog data stream into digital PCM data streams and passes them to the multiplexor.

  • Page 19: Figure 1-5. Remote Access With The Remote Annex 6100

    The Remote Annex has a maximum of 24 internal modems. The internal modems are high performance, error-correcting V.34 modems. Refer to Chapter 4 The Internal Modems for a description of the features that the modems support. The modems are used for dial-in and dial-out access to the LAN.
  • Page 20 Chapter 1 Introduction The Remote Annex comes with software that provides network access to the following networks: Refer to the Remoe Annex Administrator’s Guide for UNIX for a description of the supported software features. In addition to the standard software package, the Remote Annex software distribution includes a number of T1 commands and parameters that are used for configuration and administration (see Chapter 2).

  • Page 21: Commands And Parameters

    parameters. The Remote Annex comes with software that supports T1-specific commands and parameters for configuring and administering the device. The following sections describe those commands and parameters. T1 Commands The Remote Annex software comes with the following new or enhanced commands: Table 2-1.

  • Page 22: Stats -T

    Chapter 2 Commands and Parameters stats -T The stats -T command displays T1 network interface statistics for the Annex. stats -T [ current | total | all | interval_set | clear_alarm ] Table 2-2. Arguments for the stats -T Command Argument current total...
  • Page 23 The stats -T current command display looks like this: annex# stats -T current alarm history: [ no blue no red no yellow ], Fri July 28 16:48:37 1995 EDT Alarms: no blue engine:offline no sync serial number: 0811 circuit ID: T1 info: unit ID: XYLOGICS T1-ENGINE 085234 Rev.

  • Page 24: Table 2-3. The Stats -T Command Display

    Chapter 2 Commands and Parameters Table 2-3. The stats -T Command Display Field Sync Loss of Signal Blue Alarm Red Alarm Yellow Alarm (continued on next page) T1 Getting Started Guide Description When Sync is true, the T1 engine is detecting frame synchronization.
  • Page 25 Table 2-3. The stats -T Command Display (Continued) Field Description Loopback The loopback status has the following possible states: None - There is no loopback in progress. The test LED on the front panel is not illuminated. Local - The T1 network interface is in local loopback. The test LED on the front panel is illuminated.
  • Page 26 Chapter 2 Commands and Parameters Table 2-3. The stats -T Command Display (Continued) Field DII Sync Interval Number of Valid Seconds Number of 15-minute Periods Bursty Errored Seconds Controlled Slip Seconds Errored Seconds Severely Errored Seconds Unavailable Seconds (continued on next page) T1 Getting Started Guide Description When DII Sync is true, the Drop/Insert Interface is...
  • Page 27 Table 2-3. The stats -T Command Display (Continued) Field Description Out of Frame An Out of Frame (OOF) event begins when any two of Errors four consecutive frame synchronizing bits are received from the network interface. An OOF state ends when reframe occurs.

  • Page 28: T1_Loopback

    Chapter 2 Commands and Parameters t1_loopback The Superuser t1_loopback command places the T1 engine into loopback mode. None of the loopback conditions persist through a power down or reboot. A major consideration to those using the T1 service must be made before using this command since it will completely disrupt the T1 service.
  • Page 29 Local Local loopback will loopback the data from the customer side of both the T1 Network Interface and the T1 Drop/Insert Interface. Chapter 2 Network direction loopbacks in most cases can be initiated by the service provider. The front panel Test indicator illuminates when the T1 is in loopback.

  • Page 30: Reset

    Chapter 2 Commands and Parameters reset The reset t1 command resets the T1 engine and the T1 statistics information. This command is used to change the T1 engine’s parameter configuration. The T1 soft, hard, and esf keywords are described in Table reset t1 [soft | hard | esf] Table 2-4.
  • Page 31 Chapter 2 Commands and Parameters The reset int_modem command resets the specified T1 modem_set. There is no physical reset button. A modem reset forces the port to be reset. In addition, if the signal protocol is set to wink start or immediate start, a special AT command is sent to the modem to select the dialtone detection mechanism.

  • Page 32: Set T1

    Chapter 2 Commands and Parameters set t1 The set t1 command modifies Remote Annex configuration parameters. The syntax is: set t1 t1_parameters Refer to keywords that can be used with this command. T1 Getting Started Guide 2-12 The set t1 command (available from na or admin) requires Superuser privileges.

  • Page 33: Show T1

    Chapter 2 Commands and Parameters show t1 The show t1 command (available from na or admin) displays current T1 configuration parameters. The syntax is: show t1 t1_parameter Refer to T1 Parameters on page 2-14 for a list and description of the keywords that can be used with this command.

  • Page 34: T1 Parameters

    Chapter 2 Commands and Parameters T1 Parameters The Remote Annex software comes with the following new T1 parameters: The following paragraphs contain a description of the T1 parameters. T1 Getting Started Guide 2-14 • alarmsyslog • bypass • • ring •...

  • Page 35: Alarmsyslog

    alarmsyslog This T1 parameter enables or disables the T1 alarm event syslogs. A Y enables alarm syslogs, an N disables it. The default is Y. The command display looks like this: admin: set t1 alarmsyslog no admin: show t1 alarmsyslog alarmsyslog: no admin: Chapter 2...

  • Page 36: Bypass

    Chapter 2 Commands and Parameters bypass This T1 parameter is used to remove the T1 engine from the network. When bypass is set to Y, the T1 engine is off-line and the T1 Network Interface (T1NI) and the T1 Drop and Insert Interface (T1DII) are physically isolated from the T1 engine.

  • Page 37: Map

    This T1 parameter controls the mapping of the modems to the T1 Drop and Insert Interface (T1DII) and the T1 Network Interface (T1NI) DS0 channels. The modems can be mapped to any unoccupied slot on either interface. The interfaces can be mapped to each other on channels that are not occupied by modems.

  • Page 38: Table 2-5. Options For Mapping A Modem To An Interface

    Chapter 2 Commands and Parameters The map command is used in two ways: Mapping a Modem to an Interface The syntax for mapping a modem to an interface is as follows: set t1 ds0=< channel_number > map < map_val > < modem_number > Table 2-5.

  • Page 39: Figure 2-2. Mapping A Modem To An Interface

    Figure 2-2 illustrates this mapping. DSI Interface set t1 ds0=3 map ds1_modem 1 Modems Figure 2-2. Mapping a Modem to an Interface The command display for the previous example looks like this: admin: show t1 ds0=2,3 map ds0:2 ds0:3 admin: Chapter 2 Commands and Parameters DI Interface...

  • Page 40: Table 2-6. Options For Mapping The Two Interfaces

    Chapter 2 Commands and Parameters Mapping the Two Interfaces The syntax for mapping the two interfaces is as follows: set t1 ds0=< channel_set > map < map_val > Table 2-6. Options for Mapping the Two Interfaces Option channel_set map_val Setting a ds0 to unused makes it look busy to remote callers. This setting is useful when a modem malfunctions and needs to be replaced.

  • Page 41: Figure 2-3. Mapping The Two Interfaces

    Figure 2-3 illustrates this mapping. set t1 ds0=1 map voice DSI Interface Figure 2-3. Mapping the Two Interfaces The command display looks like this: admin: show t1 ds0=1,4,24 map ds0:1 voice ds0:4 unused ds0:24 data admin: Chapter 2 Commands and Parameters set t1 ds0=24 map data DI Interface T1 Getting Started Guide...

  • Page 42: Ring

    Chapter 2 Commands and Parameters ring This T1 parameter is used to provide the audible ring to the central office for incoming calls. The default is Y, and the audible ring is sent to the central office. This parameter is used with wink_start and immediate_start protocols only.

  • Page 43: Sigproto

    sigproto This T1 parameter is used to specify the inbound and outbound signaling protocols supported by each T1 channel (DS0). Each channel supports an inbound protocol and an outbound protocol. Both protocols must be specified even if they are the same. If the protocol pair is invalid, it is rejected with an error message.
  • Page 44 Chapter 2 Commands and Parameters The command display looks like this: admin: set t1 ds0=3,8 sigproto immediate_start none admin: show t1 sigproto ds0: out: loop_start ds0: out: wink_start ds0: out: none ds0: out: none T1 Getting Started Guide 2-24 in: loop_start in: wink_start in: immediate_start in: immediate_start...

  • Page 45: Switch_Type

    switch_type This parameter can be configured to support standard Channelized T1, Hong Kong Channelized T1, and a 1AESS switch running Channelized Standard Channelized T1 is the default configuration for this parameter. When configured for Hong Kong, it reconfigures the modem’s output levels (low frequency component to -10dBm0 and high frequency component to -6dBm0) and will reprogram the ring cadence to 300ms on, 400ms off, 300ms on, and 3s off.

  • Page 46: T1_Info

    Chapter 2 Commands and Parameters t1_info This T1 parameter stores installation information from the service provider, such as a telephone number to call should the network go down. This parameter is limited to a 120-byte string of printable ASCII characters. The command display looks like this: admin: set t1 t1_info “Example: If the network goes down,call x555”...

  • Page 47: Tdi_Distance

    tdi_distance This T1 parameter defines the distance, in feet, of the cable that runs from the T1DII to the Private Branch Exchange (PBX) or other equipment. The parameter setting is an integer from 0 to 655. The default setting is 0.

  • Page 48: Tdi_Framing

    Chapter 2 Commands and Parameters tdi_framing This T1 parameter controls which super frame format is used on the T1 Drop/Insert Interface. The parameter settings are d4 (super frame) and esf (extended super frame). The default setting is esf. The value for tdi_framing may or may not be the same as tni_framing.

  • Page 49: Tdi_Line_Code

    tdi_line_code This T1 parameter selects the line code to be used on the T1 Drop/Insert Interface (T1DII). The device connected to the T1DII determines which line code to use. The parameter settings are ami and b8zs. The default setting is b8zs. The command display looks like this: admin: set t1 tdi_line_code b8zs admin: show t1 tdi_line_code tdi_line_code:b8zs...

  • Page 50: Tni_Circuit_Id

    Chapter 2 Commands and Parameters tni_circuit_id This T1 parameter stores the T1 Circuit Identifier String. The T1 Circuit Identifier String comes from the service provider and is used for customer service calls. The parameter setting is a string of up to 120 characters.

  • Page 51: Tni_Clock

    tni_clock This T1 parameter sets the clock for the T1 Network Interface. Parameter settings include loop (service provider), local (Annex), external (T1 Drop/Insert Interface). The default setting is loop. The command display looks like this: admin: set t1 tni_clock loop admin: show t1 tni_clock tni_clock: loop admin:...

  • Page 52: Tni_Esf_Fdl

    Chapter 2 Commands and Parameters tni_esf_fdl This T1 parameter sets the T1 Facilities Data Link (FDL) format. The FDL format is used in conjunction with the ESF format and is determined by the service provider. The parameter settings include ANSI (ANSI T1.403) and AT&T (AT&T TR54016) standard formats.

  • Page 53: Tni_Framing

    tni_framing This T1 parameter controls which super frame format is used on the T1 Network Interface. Parameter settings include d4 (super frame) and esf (extended super frame). The default setting is esf. The value for tni_framing may or may not be the same as tdi_framing. The command display looks like this: admin: set t1 tni_framing esf admin: show t1 tni_framing...

  • Page 54: Tni_Line_Buildout

    Chapter 2 Commands and Parameters tni_line_buildout This T1 parameter sets the Line Build-Out (LBO) value. The Channel Service Unit (CSU) portion of the T1 Network Interface requires the administrator to configure a LBO value. The service provider will supply a value measured in decibels (dB) based on the amount of cable loss from the service provider’s location to the Annex.

  • Page 55: Tni_Line_Code

    tni_line_code This T1 parameter selects the line code for the T1 Network Interface. The service provider determines the line code setting. Parameter settings include ami and b8Zs. The default setting is b8zs. The command display looks like this: admin: set t1 tni_line_code b8zs admin: show t1 tni_line_code tni_line_code: b8zs admin:...

  • Page 56: Tni_Ones_Density

    Chapter 2 Commands and Parameters tni_ones_density This T1 parameter is used to defeat the Annex’s ones density monitor. The Annex T1 engine has a built in ones density monitor that will provide the network with the correct number of one pulses. The ones density monitor does the following: This parameter has an on and an off setting.

  • Page 57: Table 2-8. T1- Specific Parameters Vs. Mib Objects

    T1-Specific Parameters vs. MIB Objects Table 2-8 object names. of the Simple Network Management Protocol (SNMP). The following string precedes the MIB object names: “.iso.org.dod.internet.private.enterprises.xylogics.annex.”. Table 2-8. T1- Specific Parameters vs. MIB Objects T1 Parameter alarmsyslog bypass ring sigproto t1_info tdi_distance tdi_framing tdi_line_code...
  • Page 58 Chapter 2 Commands and Parameters T1 Getting Started Guide 2-38...

  • Page 59: Configuration

    Remote Annex and T1 connection. Refer to the Remote Annex 6100 Hardware Installation Guide or the Remote Annex 5391/CT1 Hardware Installation Guide for information about installing the hardware. Refer to the Remote Annex Administrator’s Guide for UNIX for configuration information.
  • Page 60 T1 Getting Started Guide Be sure that a 9600-baud terminal is attached to the console port (Remote Annex 6100) or the service port (Remote Annex 5391/CT1). Power up the Remote Annex. Press the Setup button (Remote Annex 6100 only). Make sure the Setup light is On (Remote Annex 6100 only). The...
  • Page 61 Use the na command from a host on the network, the admin command from a a virtual cli connection, or snmp to set the following T1 parameters (see Chapter 2): • tni_framing • tni_line_code • sigproto • bypass to n Your service provider can give you information on the appropriate parameter settings.
  • Page 62 Chapter 3 Configuration T1 Getting Started Guide...

  • Page 63: The Internal Modems

    he internal modems support the enhanced V.34 standard (up to 33,600 bps), are fully compatible with V.FC (V.fast Class) modems and offer support for cellular operations. Your modem automatically attempts to connect at 33,600 bps, so you don’t need to change any of its commands or settings. Due to limitations imposed by poor phone line quality or the other modem’s capability, you may not always connect at 33,600 bps.

  • Page 64: Features

    Chapter 4 The Internal Modems Features T1 Getting Started Guide • ITU-T standards: V.21, V.22, V.22bis, V.23, V.32, V.32bis, and V.34. • Compatibility with Rockwell International’s V.FC protocol. • Serial-port speeds of up to 115,200 bps. • Bell 212A and Bell 103 protocol standards. •...

  • Page 65: Using The At Command Set

    Using the AT Command Set Each command line must begin with the characters AT (the ATtention code). Both characters of the attention code must be in either upper case or lower case, but you may type the commands in any combination. Type commands after the OK response.

  • Page 66: Key At Command Factory Defaults

    Chapter 4 The Internal Modems Key AT Command Factory Defaults Table 4-1. Key AT Command Factory Defaults &Cn &Dn &F (continued on next page) T1 Getting Started Guide Title Serial-Port Bps Rate Modem-Port Bps Rate Compression Control Serial-Port DCD Control Dial DTR Control Command Echo...
  • Page 67 Table 4-1. Key AT Command Factory Defaults (continued) Title Read Configuration Register Read On-line Status Tone Dial :Tn? Read Configuration Register Result Code Form Error Correction Result Code Form Display Modem Firmware Version &Wn Store Current Configuration Store Complete Configuration You are ready to establish a connection as either a dialing modem or an auto-answer modem.

  • Page 68: Hanging Up

    Chapter 4 The Internal Modems Hanging Up To hang up, use one of these methods: Establishing 11-Bit Data Connections By default, your modem port passes 10-bit characters during MNP or LAPM connections. In a normal or direct connection, those bit and parity settings on the originating and remote modems must match for data to transfer accurately.

  • Page 69: Universal Cellular Setup

    Your modem supports cellular operation from 1200 to 14,400 bps. MNP Class 10 is not active for connections below 1200 bps. Universal Cellular Setup Land-side modem - AT&F (factory defaults) This allows the land side to make data connections with land based and cellular based modems without reducing maximum connection speeds.

  • Page 70: Additional Connection Speed Enhancements

    Chapter 4 The Internal Modems Additional connection speed enhancements In addition, registers :T17 and :T26 can shorten connect times. We suggest changing these registers only after making some cellular connections with these registers set to defaults. Using them may limit the modem’s ability to connect over noisy lines.

  • Page 71: V.32 And V.32Bis Protocols

    Chapter 4 The Internal Modems One obvious improvement is “handshaking” between V.34 modems. Connection negotiation will take about 5 seconds instead of up to 15 seconds and will use a few new tones. V.34 includes the new V.8 handshake standard, and adds line probing and fast negotiation between two modems that support it.

  • Page 72: V.23 Protocol

    Chapter 4 The Internal Modems V.23 Protocol The modem supports one V.23 mode -- main channel half duplex at 1200 bps. The features described in this manual apply to V.23 operation except that the modem does not support: V.23 1,200 Bps Half-Duplex Operation V.23 half-duplex operation is available only for direct and normal connections.

  • Page 73: V.22 And V.22Bis Protocols

    V.22 and V.22bis Protocols V.22 protocol is used for 1200 bps and 600 bps full-duplex connections. The version of V.22 your modem supports is Alternative B. V.22bis protocol enhances V.22 by adding 2400 bps full-duplex connections. For V.22 at 600 bps, both modems must be set to 600 bps. V.21 Protocol V.21 protocol is used for 300 bps full-duplex connections.

  • Page 74: Bell 212A Protocol

    Chapter 4 The Internal Modems Bell 212A Protocol Bell 212A protocol is for 1200 bps full-duplex connections. Bell 103 Protocol Bell 103 protocol is for 300 bps full-duplex connections. The features described in this guide apply to Bell 103 operation except that your modem does not support: Protocol Configuration Command Settings When you send an AT string to the modem, it adjusts modem-port speed...

  • Page 75: Table 4-2. Configuring The Modem With %F0 Set

    This section lists settings to configure the modem for each mode and protocol. Modem connection speeds are in parentheses. Table 4-2. Configuring the Modem with %F0 Set Protocol V.21 (75-300 bps) Bell 103 (75-300 bps) V.22 (600 bps) V.22 (1200 bps) Bell 212A (1200 bps) V.34/V.22bis (2400 bps) V.34/V.32bis/V.32 (4800 bps)

  • Page 76: Table 4-3. Configuring The Modem For V.23 Connections

    Chapter 4 The Internal Modems Table 4-3. Configuring the Modem for V.23 Connections When %F1, %F2, or %F3 is set for V.23 connections: Protocol V.23 (1200 bps half duplex) T1 Getting Started Guide 4-14 For the highest possible throughput available, set the modem-port speed by typing AT%G1%Bn (where n equals the desired speed).

  • Page 77: Speed And Protocol Connection Matrices

    Speed and Protocol Connection Matrices The following tables show the possible speed and protocol combinations for modem connections. They also illustrate the action of an answer modem set to use multi-mode answering. Table 4-4. Modem Speed and Protocol Combinations Mode Setting Mode Setting on Answer Modem on Originating Modem...
  • Page 78 Chapter 4 The Internal Modems Table 4-4. Modem Speed and Protocol Combinations (Continued) Mode Setting on Originating Modem V.34 (31200-33600) V.34/V.FC (2400-28800) V.34/V.32bis (4800-14400) V.34/V.32 (4800-9600) V.34/V.22bis (2400) V.22[a] (1200) V.22[b] (600) V.23[c] (half-duplex) V.21(75-300) Bell212A (1200) Bell103 (300) T1 Getting Started Guide 4-16 Mode Setting on Answer Modem Bell103...

  • Page 79: Error Correction

    Chapter 4 The Internal Modems Error Correction MNP Classes The modem provides MNP Class 10 and supports MNP Class 5 data compression. It is compatible with all MNP products. Its enhanced MNP service is completely transparent to the user. Class 10: Adverse Channel Enhancements (ACE) optimizes performance under poor line conditions.

  • Page 80: Other Classes Of Mnp

    Chapter 4 The Internal Modems Other Classes of MNP MNP Class 2 uses standard asynchronous framing techniques for data transmission and error correction. Because of this protocol overhead, the actual throughput is less than the bps rate of the modem. MNP Class 3 uses synchronous framing techniques.

  • Page 81: Diagnostics

    Universal Link Negotiation allows the modem to automatically connect with other MNP modems at the highest common speed and protocol. Statistical Duplexing adjusts the line bandwidth and data traffic flow during reliable connections to achieve maximum throughput. MNP Class 7 provides Enhanced Data Compression, which combined with Class 4 allows throughput of more than twice the connection speed.

  • Page 82: Power-Up Diagnostics

    Chapter 4 The Internal Modems Power-Up Diagnostics Power-up diagnostics test the program checksum, RAM memory, and components on the modem board each time you power up the modem or type: AT$D Enter Performing a Power-Up Diagnostic Test To perform a power-up diagnostic test, enter the following at the command prompt: AT$D Enter...

  • Page 83: Local Analog Loopback

    The test continues until the time set with register S18 runs out, or until you terminate the test by typing AT&T0 to end the test and hang up. Enter Local Analog Loopback Local Analog Loopback tests the local serial port and the local computer. This test requires you to type a sequence of characters at your computer.

  • Page 84: Remote Digital Loopback With Self-Test

    Chapter 4 The Internal Modems Remote Digital Loopback with Self-Test Remote Digital Loopback with Self-Test tests the remote modem port, the telephone line, and the local serial and modem ports. When the modem is set to Remote Digital Loopback with Self-Test, it sends the remote modem a special test data sequence, and the remote modem echoes this data back to your modem.

  • Page 85: Remote Digital Loopback

    Remote Digital Loopback Remote Digital Loopback tests the remote modem port, the telephone line, the local serial and modem ports, and the local computer. This test requires you to type a sequence of characters at your computer. The modem then sends these characters to the remote modem, which echoes them back to your modem.

  • Page 86: Local Digital Loopback

    Chapter 4 The Internal Modems Local Digital Loopback Local Digital Loopback allows the modem to loop back data to the remote modem. It tests the remote computer, the remote modem and serial ports, the telephone line, and the local modem port. Initiate a Local Digital Loopback by using the &T3 command.

  • Page 87: Respond To Remote Digital Loopback

    Chapter 4 The Internal Modems You do not see any characters on your display while your modem echoes the characters typed by the operator of the remote modem back to the remote computer. The test continues for the time set with register S18. If you do not use register S18, the operator of the remote modem must hang up or call you on another telephone line to tell you when the test is over.

  • Page 88: Result Codes

    Chapter 4 The Internal Modems Result Codes The modem can display these result codes when it attempts to establish a connection. See AT Commands and Registers on page A-1 for descriptions of the commands. Connection Result Code Tables The tables use the abbreviations: rel (reliable) and non-rel (non reliable).

  • Page 89: Table 4-6. Long Form Connect Result Codes

    Table 4-6. Long Form Connect Result Codes ATV1-M0W0 or ATV1-M0W1 Report DTE speed Non-rel DTE Speed \V0 rel 1200 1200 2400 2400 4800 4800 9600 9600 19,200 19200 38,400 38400 57,600 57600 115,200 115200 Chapter 4 The Internal Modems \V1 rel, \V2 rel \V3 rel, \V4 rel , \V5 rel 75/REL...

  • Page 90: Table 4-7. Long Form Connect Result Codes

    Chapter 4 The Internal Modems Table 4-7. Long Form Connect Result Codes ATV1-M0W2 Report modulation speed Modulation V.21 Bell 103 V.23 half-duplex V.22 V.22 \Bell 212A V.34/V.22bis V.34/V.32 V.34/V.32bis V.34/V.32 V.34/V.32bis V.34/V.32bis (continued on next page) T1 Getting Started Guide 4-28 Speed Non-rel...
  • Page 91 Table 4-7. Long Form Connect Result Codes (continued) ATV1-M0W2 Report modulation speed Modulation Speed V.34/V.FC 14400 V.34/V.FC 16800 V.34/V.FC 19200 V.34/V.FC 21600 V.34/V.FC 24000 V.34/V.FC 26400 V.34/V.FC 28800 V.34 31200 V.34 33600 If \V2 or \V4 is set and a reliable link is established, the message displays as one of the following formats: CONNECT <speed>/REL - MNP or CONNECT <speed>/REL - LAPM or CONNECT <speed>/REL - CELLULAR.
  • Page 92 Chapter 4 The Internal Modems Table 4-8 ATV0W0 or ATV0W1 Report DTE speed DTE Speed 1200 2400 4800 9600 19200 38400 57600 115200 T1 Getting Started Guide 4-30 Short Form (Numeric) Connect Result Codes \V1 non-rel \V2 non-rel \V4 non-rel \V5 non-rel \V1 rel \V2 rel...

  • Page 93: Table 4-9. Atv0W2 Report Modulation Speed

    Table 4-9. ATV0W2 Report Modulation Speed ATV0W2 Report Modulation Speed Modulation Speed V.21 or Bell 103 V.23 half-duplex 1200 V.22 V.22 or Bell 212A 1200 V.34/V.22bis 2400 V.34/V.32 4800 V.34/V.32bis 7200 V.34/V.32 9600 V.34/V.32bis 12000 V.34/V.32bis 14400 V.34/V.FC 14400 V.34/V.FC 16800 V.34/V.FC 19200...
  • Page 94 Chapter 4 The Internal Modems T1 Getting Started Guide 4-32...

  • Page 95: The Command Set

    The Command Set The modem responds to a superset of Hayes Smartmodem commands. (Additional commands use the prefixes $, %, ), *, -, :, @, and \.) The modem also stores configuration settings in a set of registers. These are similar to the Hayes Smartmodem registers, although some have enhanced modem features.

  • Page 96: Issuing At Commands At Any Speed

    Appendix A AT Commands and Registers Issuing AT Commands at any Speed You can enter AT commands at any supported serial-port speed up to 115,200 bps. Your modem automatically adjusts to the connection and command speeds (autobauds) up to 19,200 bps. Any time after you enter an AT at any speed up to 19,200 bps, you can enter commands at a new serial-port speed.
  • Page 97 Repeat Last Command Re-executes the last command immediately. The A/ command is not preceded by “AT” and not followed by Answer Forces the modem to go off hook in answer mode, regardless of the value of register S0. If result codes are enabled, your modem returns the result code RING (long form) or 2 (short form) when it receives a call.
  • Page 98 Appendix A AT Commands and Registers \A n %B n Modem-Port Bps Rate T1 Getting Started Guide Maximum MNP Block Size Sets block size up to a maximum of 64 characters. Sets block size up to a maximum of 128 characters. Sets block size up to a maximum of 192 characters.
  • Page 99 \B n Transmit Break Where n is an integer between 1 and 9 indicating the time (in increments of 100 milliseconds) to send the Break. (Default is 300 milliseconds.) During a reliable link the Break always equals 300 milliseconds. Transmits a Break to the remote system from command state. To return to connect state, type: ATO (See also \K.) %C n Compression Control Disables data compression.
  • Page 100 Appendix A AT Commands and Registers &C n Serial-Port DCD Control &C0 &C1 &C2 @C n CTS, DSR, and DCD Connect Message \C n T1 Getting Started Guide DCD always On. DCD follows the state of the carrier from the remote system; DCD turns On after the connect message.
  • Page 101 Buffers all data on the answering modem until it receives either 200 non-SYN characters or a SYN character within 3 seconds (this delay is longer for modem speeds 300 or below). If it receives 200 non-SYN characters, the modem switches to normal mode and passes the data through to the serial port.
  • Page 102 Appendix A AT Commands and Registers D <dial string> Dial T1 Getting Started Guide When either \C1 or \C2 is set, reliable and normal connections may result independent of bps rate adjust. However, when \C0 is set bps rate adjust affects the type of connection as follows: Reliable and direct connections may result when bps rate adjust is On (\J1).
  • Page 103 Dial Modifiers Dial modifiers allow you to add conditions to the telephone number you dial. You can use several modifiers with the same telephone number. Dial modifiers include: (Link Negotiation) Perform link negotiation at 4,800 bps for the current connection only. (This dial modifier is equivalent to the *H2 command.) (Link Negotiation) Perform link negotiation at 1,200 bps for the current connection only.
  • Page 104 Appendix A AT Commands and Registers T1 Getting Started Guide A-10 Tone dial is the default setting. The last P or T dial modifier used remains in effect until you either enter a dial command with a different P or T modifier or reset the modem.
  • Page 105 (Return to Command State After Dialing) Added to the end of a dial string, tells the modem to remain in command state after it dials the digits preceding the semicolon. This allows you to enter dial strings longer than 98 characters. After the final Dial command, the modem tries to establish a connection.
  • Page 106 Appendix A AT Commands and Registers T1 Getting Started Guide A-12 (Dial in LAPM Mode with Fallback to Normal) Placed anywhere in the dial string, causes the modem to override current operating mode and dial in LAPM reliable mode with fallback to normal mode for the current connection only.
  • Page 107 %D n Disconnect Buffer Delay Where n is an integer from 0 to 255 representing seconds (Default is 0). Sets a delay during which the modem attempts to process data in its transmit or receive buffer before disconnecting. When your software lowers DTR or you type attempts for n seconds to empty its transmit buffer before disconnecting.
  • Page 108 Appendix A AT Commands and Registers -D <dial string> \D n T1 Getting Started Guide A-14 Repeat Dial Where <dial string> is a string of up to 98 characters. Valid dial string characters are: 0-9, dial modifiers, and for tone dial, #, A, B, C, D and *.

  • Page 109: Table A-1. The &C And \D Settings

    The following table shows the &C and \D settings and the result of combining the two commands. Table A-1. The &C and \D Settings &C Result DCD On, DSR On, CTS On DCD On, DSR On, CTS On DCD On, DSR On, CTS On DCD On, DSR complies with the ITU-T recommendations, CTS On DCD On, CTS/DSR comply with the ITU-T recommendations...
  • Page 110 Appendix A AT Commands and Registers %E n Auto-Retrain -E n T1 Getting Started Guide A-16 Command Echo Inhibits the echoing of commands to the local device. Echoes commands to the local device. Disables the automatic retrain sequence. Enables the automatic retrain sequence (at 2400 bps or higher). When %E1 is set and line quality is too poor to sustain communications, the modem tries up to three times to resynchronize the modems (for a total of up to six seconds) before hanging up.
  • Page 111 :E n Compromise Equalizer Disables the compromise equalizer only when the modem is in V.32bis or V.32 mode; may be useful for direct line connections or PBX-to-PBX connections. Enables the compromise equalizer; may be useful for outside-line-to-outside-line or PBX-to-outside-line connections. Controls equalization operation in V.32bis or V.32.

  • Page 112: Restore Factory Defaults

    Appendix A AT Commands and Registers &F -F n T1 Getting Started Guide A-18 The \S command shows MODEM BPS V.23 AT when the modem establishes V.23 connections. Set %G1 first before setting %Fn. Restore Factory Defaults Restores factory default settings. Secondary Flow Control Disables secondary flow control characters.
  • Page 113 %G n Independent Serial-Port/Modem-Port Speed Serial-port speed determines modem-port speed. %B command determines modem-port speed. Determines whether the modem-port speed updates to match the serial-port speed with each AT command. When %G1 is set, the modem-port speed does not update, and you must change it with a %B or %Fn command.
  • Page 114 Appendix A AT Commands and Registers *H n Link Negotiation Speed -J n T1 Getting Started Guide A-20 Hang Up Disconnects from the remote system and hangs up the telephone line. Disconnects from the remote system and goes off hook in command mode.
  • Page 115 Indicates whether the originating modem sends the V.42 control sequence to the answering modem to determine the type of error correction it has enabled. The answering modem can have LAPM, MNP, or no error correction enabled. See the \N command description for the types of connections.
  • Page 116 Appendix A AT Commands and Registers -K n \K n Table A-2 illustrates the \Kn command. T1 Getting Started Guide A-22 MNP Extended Services Disables MNP Extended Services. Enables MNP Extended Services. Enables MNP Extended Services without MNP indication during the answer detect phase.

  • Page 117: Table A-2. The \Kn Command

    Table A-2. The \K n Command Local DTE Local DTE sends Break sends \B n ; local during reliable modem in Command or normal command connection mode, during reliable or normal connection Enter command Empty data state; no Break buffers; send to remote Break to remote system*...

  • Page 118: Table A-3. Modem Connections When %L1 Or %L3 Is Set

    Appendix A AT Commands and Registers %L n Speed Matching Table A-3 and Table A-4 indicate the connections that the modem can establish when %L1 or %L3 is set. Table A-3. Modem Connections when %L1 or %L3 is Set Mode Setting on Originating Modem V.34 (2400-33,600)

  • Page 119: Table A-4. Modem Connections When %L1 Or %L3 Is Set

    When both the originate and answer modems are V.8 modems, setting 300 bps will make a V.21 connection. Table A-4. Modem Connections when %L1 or %L3 is Set Mode Setting on Answer Modem Mode Setting on Originating Modem Bell212A V.34 (2400-33,600) V.22[a] V.FC (14,400-28,800) V.22...

  • Page 120: Table A-5. Modem Connections When %L4 Is Set

    Appendix A AT Commands and Registers Table A-5. Modem Connections when %L4 is Set Mode Setting: Originating Modem V.34 (2400-33,600) V.FC (14,400-28,800) V.32bis (4800-14,400) V.32 (4800-9600) V.22bis (2400) V.22[a] (1200) V.22[b] (600) To restrict the possible connections that can result, %L0 or %L2 can be set on originating or answering modem.

  • Page 121: Table A-6. Modem Connections When %L0 Is Set

    Table A-6. Modem Connections when %L0 is Set Modem Speed 1200 1200 2400 1200, 2400 4800 2400, 4800 7200 2400, 4800, 7200 9600 2400, 4800, 7200, 9600 12,000 2400, 4800, 7200, 9600, 12,000 14,400 2400, 4800, 7200, 9600, 12,000, 14,400 14,400V 14,400 16,800...
  • Page 122 Appendix A AT Commands and Registers %M n Modulation Selection )M n Power Level Adjustment -M n MNP Class Connect Messages T1 Getting Started Guide A-28 Allows connections through V.32bis. Allows connections through V.FC. Allows connections through V.34 (default). Controls the modem’s top modulation speed. for Cellular Telephone Connections For central site modems: Auto-adjustment (adjusts power level if remote modem is set to )M1).
  • Page 123 Appendix A AT Commands and Registers When -M1 is set and an MNP connection established, the connect message is CONNECT MNPn/x, where n equals the MNP Class (from 1 to 10) and x equals the type of data compression used (V.42bis or MNP Class 5).
  • Page 124 Appendix A AT Commands and Registers \N n T1 Getting Started Guide A-30 Operating Mode Sets normal mode. Sets direct mode. Sets reliable mode. Sets auto-reliable mode. Sets LAPM reliable mode. Sets LAPM reliable mode with fallback to normal mode. Sets LAPM reliable mode with fallback to MNP reliable mode.
  • Page 125 Appendix A During an MNP reliable link, both modems should use flow control on the serial port. When one detects a transmission error, it holds data in a buffer while they retransmit. You may not want to use certain other protocols, such as HP Block Mode, with MNP.

  • Page 126: Table A-7. Connection Types Depending On Operating Mode

    Appendix A AT Commands and Registers Table A-7 . Connection Types Depending on Operating Mode Answering Modem T1 Getting Started Guide A-32 LAPM reliable mode with fallback to MNP reliable mode (\N6) attempts to establish a LAPM reliable connection. If the LAPM connection attempt fails, the modem then tries to establish an MNP reliable connection.
  • Page 127 Enter Connect State Enters connect state. Begins an equalizer retrain sequence when operating at 2,400 bps or higher and then returns to connect state. Type: ATO1 to reduce errors due to loss of equalization when exces- sive bit error rates are present. %O n V.23 Equalizer Control;...
  • Page 128 Appendix A AT Commands and Registers -O n Serial-Port Parity T1 Getting Started Guide A-34 7 data bits, odd parity. 7 data bits, even parity. 7 data bits, mark parity. 7 data bits, space parity. 8 data bits, no parity. 8 data bits, odd parity.
  • Page 129 8 bits and mark parity. The AT sequence cannot be used to match 8 bit data with mark parity. Eight data bits plus mark parity can only be set by the AT-O command. If -O7 is not set, the modem defaults to 8 data bits, no parity. Space parity.
  • Page 130 Appendix A AT Commands and Registers -Q n Fallback Modulation Speeds T1 Getting Started Guide A-36 Quiet Enables output of result codes. Disables output of result codes. Disables answer mode result codes only. Determines whether the modem sends result codes and status codes (OK, BUSY, RING, etc.) to your computer.
  • Page 131 \Q n Serial-Port Flow Control Disables flow control. Enables bi-directional XON/XOFF flow control. Enables unidirectional hardware flow control; the modem uses CTS to control the terminal. Enables bi-directional hardware flow control. Enables unidirectional XON/XOFF flow control. Keeps CTS Off until connection for unidirectional hardware flow control.
  • Page 132 Appendix A AT Commands and Registers T1 Getting Started Guide A-38 During direct mode connections, the modem does not use flow control and ignores the \Q setting. Hardware flow control overrides the &C and \D settings for CTS operation. \Q1 enables bi-directional XON/XOFF flow control. Sending an XOFF character stops data transmission;...
  • Page 133 %R n Read All Registers Displays the contents of all S registers in decimal and hexadecimal integers in tabular format. Displays the contents of all :T registers in decimal and hexadecimal integers in tabular format. &R n RTS/CTS Options &R2 ITU-T V.13 emulates half-duplex over a full duplex line.
  • Page 134 Appendix A AT Commands and Registers &T n Test and Diagnostics Commands &T0 &T1 &T3 &T4 &T5 &T6 &T7 &T8 T1 Getting Started Guide A-40 Read Online Status Displays a list of modem commands and their current settings. This command also displays the active connection type, as well as the elapsed connect time and the telephone number most recently dialed.
  • Page 135 Appendix A AT Commands and Registers &T0 ends a test in progress without terminating a connection, and returns the local and remote modems to normal operation. If self-test is in progress, &T0 reports any errors. &T0 must be the last command on a command line.
  • Page 136 Appendix A AT Commands and Registers \T n %U n Clear Serial-Port Speed T1 Getting Started Guide A-42 Inactivity Timer Where n is an integer from 0 and 90 in minutes (Default is 0). Specifies the number of minutes the modem waits for data before automatically hanging up.
  • Page 137 Result Code Form Sends short-form result codes. Sends long-form result codes. Selects whether the modem sends long-form (verbose) or short-form (numeric) result codes to your computer. The format of the connection result codes is dependent upon the \V, W, and -M commands. Display Modem Firmware Version Displays the modem firmware main code version.
  • Page 138 Appendix A AT Commands and Registers T1 Getting Started Guide A-44 Use V0\V3 if your communications software requires Hayes-compati- ble connection result codes. Note that when V1 is set to select long-form result codes \V3 is equivalent to \V1. Use \V3, \V4 or \V5 to see actual connect speed. When either \V1 or \V2 is set, the message CONNECT 9600/REL displays during 4800, 7200, and 12000 bps reliable connections.
  • Page 139 %W n Pulse Digit Command n pulse digits dialed for each number. n+1 pulse digits dialed for each number. 10-n pulse digits dialed for each number. For pulse dialing, determines whether the modem dials each number in a dial string n pulses, n+1 pulses, or 10-n pulses. For example, when %W0 is in effect, it dials 6 with 6 pulses.
  • Page 140 Appendix A AT Commands and Registers *W n Store Complete Configuration T1 Getting Started Guide A-46 Stores complete user profile n, where n = 0 to 3 (Default is 0). Stores all active commands and registers as well as the restricted S-registers not stored with &W.
  • Page 141 Extended Result Codes Modem ignores dial tone and busy signals. Displays CONNECT when it establishes a connection. Smartmodem 300 compatible. Modem ignores dial tone and busy signals. Sends a connect result code including bps rate when it establishes a connection. Modem ignores busy signals.
  • Page 142 Appendix A AT Commands and Registers \X n T1 Getting Started Guide A-48 XON/XOFF Pass-Through; Processes XON/XOFF flow control characters. Processes XON/XOFF flow control characters and passes them to the local or remote system so that the local or remote device also processes them.
  • Page 143 Yn is available only during normal and direct connections. Y1 must be set on both modems to take effect. &Y n Designate Default User Profile Selects user profile n, where n = 0 to 3 (Default is 0). Designates which of four user profiles the modem loads into active configuration at power up,or when DTR drops when &D3 is set.

  • Page 144: Registers

    Appendix A AT Commands and Registers To reset the modem, type: ATZn (n = 0 to 3). If OK does not appear, type: ATQ to enable result codes. Registers Some registers control a single function. Others control several functions and are bit mapped. We recommend bit mapped registers for reading modem status only;...
  • Page 145 Point to New Register Where n is an integer from 0 to 27, indicating a register, instructs the modem to point to the register whose location is n. This becomes the last referenced register. For example, typing ATS1 places the pointer at register S1 and returns the command prompt.
  • Page 146 Appendix A AT Commands and Registers S1= n Ring Counter Range: 0 - 255 rings. Default: 0 rings. S2= n Escape Code Character Range: 0 - 255, ASCII decimal. Default: 43 (+) S3= n Carriage Return Character Range: 0 - 127, ASCII decimal. Default: 13 (carriage return).
  • Page 147 S4=n Line Feed Character. Range: 0 - 127, ASCII decimal. Default: 10 (linefeed). Sets the character recognized as a line feed. The line feed character follows the carriage return at the end of command lines and result codes. The modem does not store this register with &W; enter *W to save it.
  • Page 148 Appendix A AT Commands and Registers S7= n Wait for Carrier After Dial Range: 0 - 255 seconds. Default: 60 seconds. S8= n Pause Time for Dial Delay Range: 0 - 255 seconds. Default: 2 seconds. T1 Getting Started Guide A-54 Sets the length of time that the modem waits for: •...
  • Page 149 S9= n Carrier Detect Response Time Range: 0 - 255 tenths of a second. Default: 6 (0.6 seconds). Determines how long a signal must be present before the modem recognizes it as a carrier. The modem does not store this register with &W; enter *W to save it.
  • Page 150 Appendix A AT Commands and Registers S11= n DTMF Tone Dialing Speed Range: Default: S12= n Escape Code Guard Time Range: Default: T1 Getting Started Guide A-56 50 - 100 milliseconds. 75 milliseconds. Sets the length of time after the last tone and before the next tone is sent when the modem is dialing over a touch tone line.

  • Page 151: Table A-8. Saved Command Settings With S14

    S14= n Bit Mapped Register The modem saves the following command settings when you enter them. You do not need to enter &W or *W also. Table A-8. Saved Command Settings with S14 Bit Position Function not used command echo result codes result type dumb mode...

  • Page 152: Table A-9. Saved Command Settings With S16

    Appendix A AT Commands and Registers S16= n Bit Mapped Register, Test Options Table A-9. Saved Command Settings with S16 Bit Position Range: Default: T1 Getting Started Guide A-58 Function Local Analog Loopback not used Local Digital Loopback Remote Digital Loopback status (initiated by the remote modem) Initiate Remote Digital Loopback...

  • Page 153: Table A-10. Saved Command Settings With S21

    S21= n Bit Mapped Register Table A-10. Saved Command Settings with S21 Bit Position Function not used long space disconnect S22= n Bit Mapped Register Table A-11. Saved Command Settings with S22 Bit Position Function 4,5,6 result code options make/break ratio Appendix A AT Commands and Registers...

  • Page 154: Table A-12. Saved Command Settings With S23

    Appendix A AT Commands and Registers S23= n Bit Mapped Register Table A-12. Saved Command Settings with S23 Bit Position 1,2,3 T1 Getting Started Guide A-60 Function Decimal Value respond to remote disabled digital loopback enabled serial-port bps 0 to 300 bps 600 bps 1200 bps 2400 bps...
  • Page 155 The modem ignores the Respond to Remote Digital Loopback option during reliable connections. If you use register S23 to change the parity set automatically or set by -On, the same number of data and stop bits used before the change is retained. For example, if 8 data bits and even parity is set (-O6) and you change register S23 to odd parity, the 8 data bits and 1 parity bit are retained.

  • Page 156: Table A-13. Saved Command Settings With S27

    Appendix A AT Commands and Registers S27= n Bit Mapped Register Table A-13. Saved Command Settings with S27 Bit Position T0= n Timer for V.22bis, V.22, and V.32 Modes T1 Getting Started Guide A-62 Function answer tone when at 1200 not used During Multi-Protocol Answer Where n is an integer from 0 to 255, in tenths of a second...
  • Page 157 :T2= n Timer for V.21 Mode During Multi-Protocol Answer Where n is an integer from 0 to 255 representing tenths of a second. Default is 0 (V.23 half duplex disabled). This command requires 1200 bps or higher operation with %F0%L1\N3 set. When the modem is unable to establish a V.32, V.22bis, or a V.22 connection, :T2 determines how long the modem attempts to establish a V.21 connection before attempting a V.23 half-duplex...
  • Page 158 Appendix A AT Commands and Registers :T3= n Timer for V.21 and V.23 Answer Tone :T4= n Timer for Line Turnaround Delay - Carrier T1 Getting Started Guide A-64 Duration Where n is an integer from 0 to 33 (tenths of a second) Default is 33 (3.3 seconds).
  • Page 159 :T5= n Timer for V.23 Half-Duplex Intercharacter Delay Where n is an integer from 0 to 255 (in increments of 12.5 milliseconds) Default is 7 (87.5 milliseconds). This command takes effect only during normal mode V.23 half-duplex connections. Sets the length of time the modem waits after transmitting the last data character in the transmit buffer before turning carrier off.
  • Page 160 Appendix A AT Commands and Registers :T7= n Timer for False Answer Abort :T9= n Primary XON Flow Control Character T1 Getting Started Guide A-66 Where n is an integer from 0 to 255, representing seconds Default n=60 seconds; setting :T7=0 disables this timer. This command takes effect only when the modem falls back to a normal mode V.23 half-duplex connection.
  • Page 161 :T10= n Primary XOFF Flow Control Character Where n is a decimal from 0 to 255, representing an 8-bit character.Default is 13 hexadecimal (or 19 decimal) <DC3>. Defines the character used for primary XOFF flow control on the modem and serial ports. Enable primary flow control with \Q1, \Q4, \G1, or \G2.

  • Page 162: Table A-14. T15 Command Settings

    Appendix A AT Commands and Registers :T14= n Connect Message Delay Timer :T15= n V.24 Control Register Table A-14. T15 Command Settings Bit Position Function T1 Getting Started Guide A-68 Where n is an integer from 0 to 255, in 100 millisecond interval. Default is 0.
  • Page 163 :T16= n CTS Turn On Delay Timer Where n is an integer from 0 to 255 (in increments of 12.5 milliseconds). Default is 0. After DCD and/or DSR have been turned On while connecting, determines how long the modem waits before turning On CTS. :T17= n V.32/V.32bis Connection Training Timer Where n is an integer from 0, 1, 5 to 32.

  • Page 164: Table A-15. Mnp Link Control

    Appendix A AT Commands and Registers :T19= n Bit Mapped Register Table A-15. MNP Link Control Bit Position :T22=n DSR Timer T1 Getting Started Guide A-70 Where n is an integer from 0 to 255 (see below for the valid values for n).

  • Page 165: Table A-16. :T23 Settings

    :T23= n Bit Mapped Register Table A-16. :T23 Settings Bit Position Function not used Rate negotiation at start-up not used :T26= n Bit Mapped Register Table A-17. :T26 Settings Bit Position Function Enables 2-second billing delay Disables 2-second billing delay This bit decreases connection time, but may affect attaining connections Normal answer tone length in V.32 mode...
  • Page 166 Appendix A AT Commands and Registers :T42= n V.34/V.FC Connection Speed Selection T1 Getting Started Guide A-72 Default V.34/V.FC connection speed selection. Highest V.34/V.FC connection speed selection (about 2 speeds above default). Higher V.34/V.FC connection speed selection (about 1 speed above default).
  • Page 167 T registers, displaying A-39 T registers, overview A-50 T17 and T27 with cellular connections 4-8 T2 and auto-answer 4-8 Symbols $B to change serial-port speeds 4-3 $D and diagnostics 4-20 %G and protocol settings 4-12 *H and cellular connections 4-7 +++ to enter command state 4-6 Numerics 10-bit data characters A-16...
  • Page 168 Index bidirectional hardware flow control A-38 bong detect dial modifier A-11 bootstrap, display version A-44 bps rate A-42 bps rate adjust command A-21 bps rate, modem port A-4 bps rate, serial A-4 break transmit A-5 break command A-5 break control command A-22 buffer delay command A-13 buffer, setting auto-reliable A-6 bypass parameter 2-16...
  • Page 169 data buffering by command A-6 data carrier detect by command A-6 Data compression 4-17 data compression A-5 data echo A-17 data echo command A-17 data length 10-bit characters A-16 11-bit characters A-16 data length command A-16 DCD command A-6 DCD command table A-15 DCD delay timer A-65 default settings A-2, A-18, A-49 default user profile A-49...
  • Page 170 Index disable secondary flow control A-18 disable speed matching A-24 disconnect buffer delay command A-13 disconnect by command A-20 display configuration register A-51 registers A-39, A-51 display connection speed A-44 display firmware version A-43 display modem identification A-20 display modem settings A-40 displaying commands A-16 displaying registers A-39 DSR A-6, A-14...
  • Page 171 serial port A-37 XON/XOFF A-48 flow control characters A-66 flow control command A-37 flow control enabling secondary characters A-18 flow control, modem port A-19 flow control, primary XOFF character A-67 guard time, escape code A-56 guard tone register A-60 guard tone, disable A-19 guard tone, set frequency A-19 half-duplex and V.23 4-10 handshaking in V.34 4-9...
  • Page 172 Index a modem to an interface 2-18 the two interfaces 2-20 maximum MNP block size A-4 messages, MNP A-28 MNP A-4, A-22 class connect messages A-28 MNP 3 4-18 MNP 4 4-18 MNP 6 4-18 MNP 7 4-19 MNP 9 4-19 MNP classes 4-17 MNP connect messages A-28 MNP connections and V.23 4-10...
  • Page 173 protocol command settings 4-12 protocol connection matrices 4-15 protocols used by modem 4-2 protocols, overview 4-8 pulse dial command A-35 pulse dial modifier A-9 pulse dialing A-9 pulse dialing, digits A-45 pulse digit command A-45 quick connect cellular calls 4-7 quiet answer A-10 quiet command A-36 quiet dial modifier A-10...
  • Page 174 Index commands 3-1 RTS A-39, A-59, A-61 RTS/CTS options A-39 S registers, displaying A-39 S registers, overview A-50 S registers, read A-39 saved configuration settings A-45, A-49 secondary XOFF character A-67 secondary XON character A-67 serial port clear speed A-42 flow control A-31, A-37 speed A-21 serial port bps rate A-4...
  • Page 175 vs. MIB objects 2-37 t1_info parameter 2-26 t1_loopback command 2-1, 2-8 tdi_distance parameter 2-27 tdi_framing parameter 2-28 tdi_line_code parameter 2-29 telephone line quality 4-9 telephone numbers dialing A-8 test command A-40 test timer register A-58 time delay RTS to CTS A-61 time delay, asynchronous/synchronous A-61 time delay, DTR A-61 timer...
  • Page 176 Index V.8 command A-24 V.8 handshaking 4-9 V.FC (V.fast Class) overview 4-8 V.FC/V.34 compatibility 4-9 verbose result codes A-43 wait before dialing A-10, A-53 for carrier after dial A-54 for dial tone before dialing A-54 for hang up after carrier loss A-55 for quiet answer A-10 wait before dial A-53 wait for carrier after dial A-54...

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