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General DataComm Megamux Plus 036M241 Operator Instructions Manual

Time division multiplexer
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  • Page 2 ATTENTION! STATIC SENSITIVE DEVICES PROPER HANDLING AND GROUNDING PRECAUTIONS REQUIRED This equipment contains electrostatic sensitive devices. Use ESD pre- cautionary procedures when removing or inserting parts or printed circuit (pc) cards. Keep parts and pc cards in their antistatic packaging material until ready to install.
  • Page 3 M E G A M U X P L U S 7,0(#',9,6,21#08/7,3/(;(5 (GDC PART NO. 036M241) This product was designed and manufactured by General DataComm, Inc. (GDC) Middlebury, Connecticut 06762-1299...
  • Page 4 06762-1299 PROPRIETARY NOTICE This publication contains information proprietary and confidential to General DataComm, Inc. Any reproduction, disclosure, or use of this publication is expressly prohibited except as General DataComm, Inc., may otherwise authorize in writing. Copyright, General DataComm, Inc., 1991...
  • Page 5 FCC-REQUIRED NOTIFICATION FOR USERS OF FCC-REGISTERED EQUIPMENT Read before using this technical manual or installing subject equipment. This equipment complies with Part 68 of the Federal Communications Commission (FCC) Rules and Regulations. Connection of data communication equipment to the public telephone network is regu- lated by the FCC Rules and Regulations.
  • Page 6 CANADIAN DEPARTMENT OF COMMUNICATIONS (DOC) REQUIRED NOTIFICATION FOR USERS OF DOC-CERTIFIED EQUIPMENT Read before using this technical manual or installing subject equipment. The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets certain telecommunications network protective, operational, and safety requirements.
  • Page 8 (55$7$#6+((7 MEGAMUX PLUS TDM OPERATOR'S INSTRUCTIONS Publication No. 036R660-000, Issue 9 OVERVIEW The VLBRV (Very Low Bit Rate Voice) or VLBRV/FAX Channel Module is an analog voice channel card for the MEGAMUX PLUS TDM. It provides voice encoding algorithms that max- imize voice channel bandwidth utilization while offering low bit rate values of 9600, 4800 and 2400 bps.
  • Page 9 Circuit Type The circuit type entry defines the type of voice signal that the channel multiplexes. The selection is determined by the equipment connected to the channel. The circuit type must also be supported by the VLBRV Channel Module associated with the channel number. The VLBRV Channel Module receives and transmits VF (Voice Frequency) signals.
  • Page 10 Alarm Cut-Off (ACO) The VLBRV has the capability to generate alarms indicating failures related to the VLBRV Channel Module's operation. Alarms are indicated through front panel indicators, messages dis- played in the system alarm scan, or by the VLBRV Channel alarm scan. When alarm cut-off (ACO) is selected, the VLBRV Channel Module cannot report alarm conditions to the system.
  • Page 11 VLBRV CHANNEL PARAMETERS CONFIGURATION Once the correct aggregate rate is entered, VLBRV channel parameters are entered or modified as required by the configuration. To select the VLBRV channel parameter display (if it is not already on the screen), select the Configuration routine from the Main Menu. Next, select the appropriate Modify/Display TDM Configuration routine from the Configuration Menu.
  • Page 12 CIRCUIT NAME The circuit name is a channel identifier assigned by the user. The name may be up to six alpha- numeric characters in length: The name may include any punctuation or non-standard char-acters available on the keyboard. However, the first character entered must be an alpha character. You enter the circuit name by typing the desired characters.
  • Page 13 ACO ON/OFF Alarm Cutoff selects whether alarms in the VLBRV Channel Module are reported and logged in the alarm scan, or indicated by the Common Alarm Plus Module front panel indicators. This feature is useful when a malfunctioning channel produces enough alarms to prevent alarm reporting on oth- er channels.
  • Page 14 Digital Test The Digital Test uses the digital circuitry of the data origin node VLBRV Channel to generate a digital "quiet channel pattern." If the data origin node is the same as the loopback point (a local loopback) the digital pattern is looped back at the interface between the Transmit/Receive Logic Plus module and the VLBRV Channel Module.
  • Page 15 The following instructions apply to the Rcv dB Levels routine: 1. Select the Channel diagnostics and Data Path Test. Use the up or down cursor position keys to select RCV dB. Use the left and right cursor position keys to move the cursor to the Data Origin field.
  • Page 16 036R660-E1...
  • Page 17 VLBRV CHANNEL STATUS SCAN The Status Scan provides information on the current state of the MEGAMUX PLUS system. Dis- plays report either system status or the condition of individual MEGAMUX PLUS components. The displays are real-time, with immediate reporting of new system developments. Two routines, General or Specific Status Scan, control the type of scan displayed.
  • Page 18 VLBRV Channel Status Scan When you select the Channel Status Scan from the Specific Scan menu, the following prompt ap- pears: ENTER CIRCUIT NAME OR NUMBER: The VLBRV channel may be specified either by channel number or by the name assigned in the configuration.
  • Page 19 ALARM SCAN Reports the most recent alarm messages associated with the VLBRV Channel Module. After dis- playing the messages, you have the option of deleting them. CONTROL STATES SCAN Displays the names and states of each channel control signal. Four possible signal states are report- ed as follows.
  • Page 20 Hard Copy When the Hard Copy routine is selected, the printer (connected to the MEGAMUX PLUS system printer port), prints alarm messages stored in the alarm buffer and any additional alarm messages as they occur. The following operating instructions are applicable to Lear Siegler Models ADM- 12 and ADM-12 Plus terminals.
  • Page 21 TABLE 1. MEGAMUX PLUS CHANNEL ALARM MESSAGES COMPONENT Alarm Message Description VLBRV Channel Local Loopback A loopback condition exists in the specified channel card at the specified node. Transmit data is being looped back to receive data at the interface between the channel and the T/R Logic Module.

  • Page 22: Table Of Contents

    Table of Contents Section 1: Introduction Overview..........................1-1 General Information....................... 1-1 Supervisory Port CRT Interface ..................1-2 Firmware Revision Levels....................1-2 Section 2: System Overview Overview..........................2-1 SYSTEM COMPONENTS....................2-1 Aggregate Frame ......................2-4 SYSTEM CONFIGURATIONS.................... 2-5 BUILDING A CONFIGURATION .................2-6 COPYING CONFIGURATIONS AND CHANNELS ............2-6 ENTERING AN AGGREGATE RATE ................2-7...
  • Page 23 Table of Contents Section 5: Configuration Overview ..........................5-1 GENERAL..........................5-1 CONFIGURATION ROUTINES..................5-1 SELECTING AN AGGREGATE RATE................5-4 SELECTING CHANNEL PARAMETERS................5-5 COPYING CHANNEL PARAMETERS................5-10 ACO ALL CHANNELS...................... 5-10 DISPLAYING CONFIGURATION DATA ............... 5-11 SAVING A CONFIGURATION ..................5-11 COPYING A CONFIGURATION..................
  • Page 24 Table of Contents Section 8: Diagnostic Functions Overview..........................8-1 GENERAL ..........................8-1 COMMON SET, AUTO FRAME, POWER SUPPLY DIAG ROUTINES......8-4 AGGREGATE INTERFACE DIAGNOSTIC ROUTINES ..........8-4 CHANNEL DIAGNOSTIC ROUTINES ................8-6 Control State Scan and Test .....................8-7 Synchronous, Asynchronous,Isochronous, Transition-Encoded, and TID-III Channel Data Path Tests..................8-9 Voice II CVSD, PCM, ADPCM, and ASP Channel Data Path Tests...
  • Page 25 Table of Contents MEGAMUX PLUS TDM 036R660-000 Operator’s Instructions Issue 10...

  • Page 26: Overview

    6HFWLRQ#4=##,QWURGXFWLRQ Overview This section provides an introduction to the MEGAMUX PLUS Time Division Multiplexer. The information provided here and in other sections of this manual deals specifically with the oper- ation of the MEGAMUX PLUS supervisory port CRT interface. For more detailed information on the MEGAMUX PLUS system, refer to the MEGAMUX PLUS TDM Instruction Manual, GDC Publication No.

  • Page 27: Supervisory Port Crt Interface

    Shelf Installation Supervisory Port CRT Interface The MEGAMUX PLUS TDM system is controlled through a CRT inter-face. The interface at one site is designated as the "master node." The interactive control provided through the master node interface includes the following features: •...
  • Page 28 Shelf Installation TABLE 1-1. MEGAMUX PLUS FIRMWARE REVISION LEVELS Features Firmware Release Versions Supported A100 A101 A111 A120 A121 A112 Basic MEGAMUX PLUS Features Interface to NETCON Expanded Aggregate Data Rate Selection Variable Ones Density Selection Fixed Rate ASP Multi-Rate ASP/UVC ADPCM TID-III Data Channel Module Expanded Data Channel Rate Selection Change Software Revision Levels to Previous Levels...
  • Page 29 Shelf Installation 036R660-000, Issue 10...

  • Page 30: Overview

    6HFWLRQ#5=##6\VWHP#2YHUYLHZ Overview This section gives a description of the MEGAMUX PLUS system, with emphasis placed on the system characteristics that you will encounter when operating MEGAMUX PLUS through the su- pervisory port CRT interface. The intention of this section is to provide background information that will help you to make informed choices when configuring a MEGAMUX PLUS system.
  • Page 31 System Overview Each component is described in the following paragraphs: Common Set The common set comprises the Transmit/Receive Logic Plus module, the Clock Generator Plus module, and, in systems with more than 22 channels, the Expansion Plus module. The Transmit/ Receive Logic Plus module selects data from channels, and assembles channel data into an aggre- gate data stream for transmission to the opposite-end MEGAMUX PLUS TDM.
  • Page 32 System Overview The Voice II/CVSD channel module uses Continuously Variable Slope Delta (CVSD) modula- tion techniques to perform voice-to-data and data-to-voice conversions. The term CVSD is used in all supervisory port inter-face displays to refer to the Voice II/CVSD module. The Voice II/ CVSD Channel can operate using a range of data rates from 14.4 kbps to 64.0 kbps.

  • Page 33: Aggregate Frame

    System Overview FIGURE 2-2. TANDEM VOICE CHANNEL INSTALLATION Tandem Voice Channel Configuration A Voice II/CVSD channel may be installed in a tandem arrangement. With this arrangement, a Voice channel at one end is connected to a Data II channel at the opposite end. This enables the use of tandem voice channels, where two MEGAMUX PLUS links operate back-to-back, and a syn- chronous data channel link completes a voice channel link through two MEGAMUX PLUS sys- tems.

  • Page 34: System Configurations

    System Overview SYSTEM CONFIGURATIONS A T D M m u st b e ab le to ad ap t to o p era tio n in d ifferen t en v iro n m en ts an d fu lfill v ario u s req u irem en ts. W h en a T D M is set to o p erate in a p articu la r en v iro n m en t, it is said to b e co n fig u re d fo r th at en v iro n - m en t.

  • Page 35: Building A Configuration

    System Overview BUILDING A CONFIGURATION A MEGAMUX PLUS TDM may be delivered and installed with a complete set of configurations, or may be installed completely unconfigured. Even when the unit is completely pre-configured, you will probably need to make minor adjustments to some channel configurations. When creating a new configuration, you should follow these steps: Name the system configuration (up to ten characters are allowed in the name;...

  • Page 36: Entering An Aggregate Rate

    System Overview ENTERING AN AGGREGATE RATE When creating an aggregate configuration, you should always enter the aggregate rate before con- figuring channels. Once an aggregate rate is entered, the selected and measured aggregate rates appear below every channel parameter display: SELECTED AGGREGATE RATE 2.048 MHZ EST.

  • Page 37: Channel Configuration/Parameters

    System Overview A situation may exist in which a MEGAMUX PLUS is powered up before the incoming aggregate clock is present. In this case, the MEGAMUX PLUS will not know what rate to frame to and syn- chronization with the other end may not occur. Two enhancements in the 4.00 release alleviate this problem.
  • Page 38 System Overview Channel Number The channel number associates a set of channel parameters with a channel module in the MEGA- MUX PLUS TDM shelf: The channel number is determined by the position of the channel mod- ule in the shelf. Channel numbers run from 1 up to a maximum of 54 (you must have one expansion shelf for a system with up to 38 channels, and two expansion shelves for a 54-channel system).
  • Page 39 2-10 System Overview FIGURE 2-3 MEGAMUX PLUS MODULE LOCATIONS 036R660-000, Issue 10...
  • Page 40 System Overview 2-11 The circuit type may be one of the following choices. Each selection is discussed below. Revision Level Revision Level Revision Level Revision Level A1XX 2.XX 3.XX 4.XX T-Enc T-Enc Sync Sync T-Enc T-Enc Isoc Isoc Sync Sync Async Async Isoc...
  • Page 41 2-12 System Overview T-Enc (Transition-Encoded) T ran sitio n -E n co d in g m ay b e u sed w ith an y ty p e o f d ata. W h en th is circu it ty p e is selected , th e D ata II C ha nn el m o d u le en co d es each b it tran sitio n in th e d ata stream u sin g a th ree-bit co d e.
  • Page 42 System Overview 2-13 CADM CADM is a digital voice channel used for foreign applications only. This circuit type should nev- er be selected for domestic applications. PCM-T (Pulse-Coded Modulation) PCM-T is selected when the Voice II/ASP Channel module is used but a higher fixed data rate of 64 kbps is desired.
  • Page 43 There are many standard baud rates available from the MEGAMUX PLUS TDM. If a baud rate required for a channel is not available as a standard rate, General DataComm can provide a custom-programmed Clock Generator Plus module that produces the required timing signal.
  • Page 44 System Overview 2-15 is because the two timing signals, no matter how precise, have some difference in frequency. One timing signal inevitably is slightly faster or slower than the other, so that one signal lags behind the other: This would eventually result in data errors. MEGAMUX PLUS has the ability to either generate a master timing signal for the system, or to phase-lock system timing to an external source.
  • Page 45 2-16 System Overview Transmit External/Receive Internal This selection is made for modem "tail" circuits operating from a channel interface. The timing sig- nal from the MEGAMUX PLUS channel is provided to the modem connected to the channel, along with the receive data output from the channel. The modem encodes the timing signal with the data, and transmits the combined modulated signal to the far-end modem (remember that the receive data from the channel is the transmit data into the modem).
  • Page 46 System Overview 2-17 The most common application for this timing arrangement is when ATT's DDS (Digital Data- phone Service) is used as either an aggregate link or a channel 22 tail circuit. ATT maintains a precise timing signal (derived from an atomic clock) across all DDS links. If a DDS link provides the master timing source for the MEGAMUX PLUS system, any channel that connects to a DDS tail circuit link should be set for external transmit and receive timing.

  • Page 47: Vf Db Levels

    2-18 System Overview VF dB Levels The output level of any voice channel is selected as a channel parameter. The level may be spec- ified in a range of +1.5 dB to -6.0 dB, with .5 dB between each level (a total of 16 selectable lev- els).

  • Page 48: Interface Type (I/F Type)

    System Overview 2-19 Interface Type (I/F Type) An interface type must be specified for every data channel. The interface type determines the con- trol signal arrangement used at the Node M and Node S ends of the channel. The flexibility of the MEGAMUX PLUS system allows support of many communications arrangements, and provides display and control over the interfaces through the supervisory port CRT.
  • Page 49 2-20 System Overview Data Channel Interface There are eight selectable data channel interface types. Each interface type supports a particular communications link between two data devices. The eight types are: • CPU to Terminal - (CTA1) • CPU to Terminal - DCD/DSR On (CTRL) •...
  • Page 50 System Overview 2-21 There are three different control signal program plugs. Each plug is associated with one or more of the selectable interface types, as shown in Table 2-1. Figure 2-7, A-C, illustrates each program plug, and shows how control signals are routed through the channel interface and across the TDM link by each program plug.
  • Page 51 2-22 System Overview FIGURE 2-7. CONTROL PROGRAM PLUGS (Sheet 1 of 2) 036R660-000, Issue 10...
  • Page 52 System Overview 2-23 FIGURE 2-7. CONTROL PROGRAM PLUGS (Sheet 2 of 2) 036R660-000, Issue 10...
  • Page 53 2-24 System Overview A Data II, III or UDC Channel Module, when set for a particular application, has program plugs PP1 and PP2 set to support that application. The settings of these two plugs select up to four control signals from the device connected to the channel at that node. Both data channel modules can trans- mit the On or Off state of the selected signals across the TDM link to the data channel module at the opposite node.
  • Page 54 System Overview 2-25 If the signal selected as SEND Control l changes state from Off to On, the transition is encoded and transmitted as channel data. This eliminates virtually all delay in transmitting the signal change, allowing the channel to support polling and other arrangements requiring fast control sig- nal transmission.
  • Page 55 2-26 System Overview CPU/TERM NODE M NODE S S E N D : RTS : DCD CPU Terminal (CTA1) In this interface type, a CPU port is connected to the channel interface at one node (typically Node M); a terminal is connected to the opposite-end channel (typically Node S). SEND control RTS (Re- quest to Send) at both channel interfaces becomes RCV control, DCD (Data Carrier Detect) at both channel interfaces.
  • Page 56 System Overview 2-27 CPU/TERM - DSR ON NODE M NODE S S E N D : RTS : DCD CPU to Terminal - DSR On (CTC1) This interface type is similar to CTB1 discussed above. A CPU port is connected to the Node M channel interface;...
  • Page 57 2-28 System Overview CPU/TERM - POLLING NODE M NODE S S E N D : RTS CTS RTS CTS : DCD CTS DCD CTS CPU to Terminal - Polling (CTP2) This interface type supports a polling operation. A front-end processor port is connected to the channel interface at Node M;...
  • Page 58 System Overview 2-29 CPU/DIAL-UP MODEM NODE M NODE S S E N D : RTS OOS DCD CTS : DCD CTS RTS OOS CPU to Dial-Up Modem (CDM3) In this interface type, a CPU port is connected to the Node M channel interface; a switched net- work (dial-up) modem is connected to the Node S channel interface.

  • Page 59: Activating A Configuration

    2-30 System Overview ACTIVATING A CONFIGURATION A configuration actually controls the multiplexing process when it is activated. The configuration may be activated immediately by a MEGAMUX PLUS operator, or automatically, at a time and date specified by the Activate a TDM Configuration routine. When a configuration is activated, all channel parameters are transferred from non-volatile memory to data memory (RAM) on the AUTO FRAME module.

  • Page 60: Overview

    6HFWLRQ#6=##2SHUDWLRQ Overview This section describes the operating features of the MEGAMUX PLUS supervisory port CRT in- terface. The information in this section describes general operating procedures only. Refer to Sec- tions 4 through 8 for detailed instructions on implementing particular routines. MEGAMUX PLUS OPERATING PROCEDURES The MEGAMUX PLUS operating system is designed to simplify TDM operation, and avoid op- erator error and confusion.
  • Page 61 Operation Status Line Operating Directions The top line of the CRT display is reserved for use as a Status Line. For every MEGAMUX PLUS menu and display, the Status Line contains instructions concerning which keys to use and how to select and modify information.

  • Page 62: Megamux Plus Keyboard

    Operation MEGAMUX PLUS KEYBOARD The MEGAMUX PLUS operating system uses a small number of keys for most operations. The keys required to make selections for any display are defined specifically for that display; the sta- tus line indicates which keys are active and how they function at that point in the selection pro- cess.

  • Page 63: Control Functions

    Operation Control Functions Certain special MEGAMUX PLUS functions are selected by depressing the Control (CTRL) key simultaneously with the X, C, S, Q or P key. Each function is described below. Control X Depressing the Control key and the X key simultaneously steps the display back one level to the menu from which the display on the screen was selected.

  • Page 64: Megamux Plus Operating Routines

    Operation MEGAMUX PLUS OPERATING ROUTINES When no operations are being performed through the CRT interface, the following Main Menu is displayed: *--MAIN MENU FOR MEGAMUX PLUS [REV ----]--' ETC. HELP MAIL LOG OFF RESET PASSWORD RESET (DATE/TIME) If you use the up or down cursor keys to move the cursor to ETC. and press the Carriage Return key, the second page: of the Main Menu is displayed: '-MAIN MENU FOR MEGAMUX PLUS-[REV ----]--* ETC.
  • Page 65 Operation Alarm Scan The Alarm Scan reports failures in the MEGAMUX PLUS TDM system. Alarm messages are cen- tered around the MEGAMUX PLUS components reported through the CRT interface. The time, date, and node of alarm occurrence are included with each message. Alarm messages may be dis- played or printed from the CRT's printer port.

  • Page 66: Master/Slave Supervisory Port Crt Interfaces

    Operation MASTER/SLAVE SUPERVISORY PORT CRT INTERFACES In the MEGAMUX PLUS system, there must be a master CRT interface; a slave CRT interface is optional. The interface is set by a switch on the AUTO FRAME module (refer to the MEGA- MUX PLUS Instruction Manual, GDC Publication No.
  • Page 67 Operation FIGURE 3-1. MEGAMUX PLUS MAIN MENU ROUTINES 036R660-000, Issue 10...

  • Page 68: Overview

    6HFWLRQ#7=##&57#0DQDJHPHQW#5RXWLQHV Overview This section describes the routines involved with the proper management of the MEGAMUX PLUS supervisory port CRT Interface, rather than the multiplexer system. These routines, all ac- cessible from the Main Menu, are necessary for optimal use of the CRT interface. HELP When selected, this routine displays operating information concerning CRT key functions.

  • Page 69: Reset Password

    CRT Management Routines RESET PASSWORD The Reset Password routine allows you to change the system protection password. When you select the routine from the Main Menu, the following prompt appears: ENTER OLD PASSWORD After the old password is entered, the following prompt appears: ENTER NEW PASSWORD (9 CHAR'S MAX) Use the alphanumeric keys to enter a password no longer than nine characters (punctuation marks and other keyboard symbols may also be used).

  • Page 70: Overview

    6HFWLRQ#8=##&RQILJXUDWLRQ Overview This section describes the use of the Configuration routines to create, display, copy and activate system configurations. The information provided here is oriented towards the operations required to perform routines; descriptions of purpose and system requirements are intentionally kept brief to facilitate the use of this section as a quick reference.
  • Page 71 Configuration Modify/Display TDM Configuration The three Modify/Display routines are identical. Each routine selects or displays parameters for one of the three alternate MEGAMUX PLUS configurations. Each of the configurations is given a name during channel configuration; once a name is assigned, it is displayed in the Configuration Menu. When any one of the Modify/Display routines is selected, a Modify/Display TDM Configuration menu is displayed.
  • Page 72 Configuration A change in revision level causes any remote autoframes to follow the revision if they are version X.10 and up and the originating autoframe is also X.10 and up: While you are changing revision types, entering a Control-C (<Ctrl-C>) is ignored until execution of the change is complete.

  • Page 73: Selecting An Aggregate Rate

    Configuration SELECTING AN AGGREGATE RATE When entering a configuration, the aggregate rate for the configuration should always be selected before any channel parameters are chosen. Once the aggregate rate is entered, the Current Parame- ters display reports the amount of aggregate bandwidth available after each new rate is selected. This prevents the creation of a configuration too large to be multiplexed at the selected aggregate rate.

  • Page 74: Selecting Channel Parameters

    Configuration The following defines each selection. ".." selection - allows the 1's density requirements to be established by the T1 or T1/D4 Piggy- back Card installed on the Redundancy Control Plus module. The T1 and T1/D4 Piggyback Cards contain option selection devices which allow the 1's density feature to be enabled or disabled. 0 selection - completely inhibits the 1's density feature.
  • Page 75 Configuration number and type are only accessible after a circuit type is entered. When you select a circuit type, default values are displayed for the channel parameters associated with the circuit type. These de- fault values are displayed and stored until you change them. The name of the TDM configuration can also be changed during channel configuration.
  • Page 76 Configuration BAUD RATE The baud rate of a channel is determined by the baud rate of the equipment connected to the chan- nel. With the cursor positioned at BAUD RATE, you begin the selection by pressing the Return key; the standard MEGAMUX PLUS channel rates and SPECIAL RATES selections appear be- low the channel parameters display.
  • Page 77 Configuration NA32K This 32 kbps mode complies with the current ADPCM joint standard provided by CCITT G.721 and ANSI committee T1Y1.2. This operating mode is preferable for voice applications; it provides superior performance in an idle channel situation. Use this operating mode for 32 kbps voice chan- nels unless a specific application dictates selection of another mode.
  • Page 78 Configuration nel parameter. ACO ON/OFF is not available in the Universal MEGAMUX PLUS. Note, ACO/ ON/OFF is only applicable for A100 and 2.00 through 2.03. I/F TYPES Standard interface types are provided for both voice and data channels. There is a standard E and M control arrangement for CVSD and ASP voice channels, and no interface type for PCM or AD- PCM voice channels.

  • Page 79: Copying Channel Parameters

    5-10 Configuration COPYING CHANNEL PARAMETERS The Copy Parameters from One Channel to Another routine allows you to copy the parameters from an existing channel to another channel or range of channels. This routine permits rapid configura- tion of identical channels. You can also configure similar channels (such as synchronous channels with different baud rates) by first copying channels and then using the Modify Channel Parameters routine o enter the differences.

  • Page 80: Displaying Configuration Data

    Configuration 5-11 DISPLAYING CONFIGURATION DATA Displays of each of your system's MEGAMUX PLUS configurations are available through the Modify/Display TDM Configuration display. Each display reports the channel parameters select- ed for each channel in the configuration. To select a display, select the appropriate Modify/Display TDM Configuration routine from the Configuration Menu.

  • Page 81: Copying Aconfiguration

    5-12 Configuration If you do not select SAVE CHANGES after modifying channel parameters, and try to use Control X to exit the Modify/Display TDM Configuration routine, the following message appears: SAVE CHANGES? Y/N If N is entered, the Configuration Menu returns to the screen. If Y is entered, the configuration is checked and stored in the manner described above.
  • Page 82 Configuration 5-13 Never This selection permits you to store configurations for future use. NOTE If all three configurations are set for activation NEVER, configuration #1 is activated after power-up. This selection activates a configuration immediately. The configuration remains active until su- perseded by a newly activated configuration.

  • Page 83: Local Oos Auto Frame Updating

    5-14 Configuration LOCAL OOS AUTO FRAME UPDATING Previously, the only way for the out-of-service card to be updated with a new configuration was by receiving this information from the link. This information was sent by the master node, and echoed back to the master by the slave node while the slave's redundant Autoframe card picked up the pack- et.

  • Page 84: Tid-Iii Channel Module Overview

    Configuration 5-15 TID-III CHANNEL MODULE OVERVIEW The TID-III Data Channel Module functions as a single time independent data channel interface within a network that may include synchronous, asynchronous, time independent, or encoded voice channels. The TID-III (Time Independent Data) Channel Module provides a unique solution for isochro- nous/plesiochronous data communication for the MEGAMUX PLUS TDM.

  • Page 85: Tid-Iii (Time Independent Data Iii) Module Options

    5-16 Configuration TID-III (Time Independent Data III) Module Options The TID-III is configured using both hardware and software options. Refer to the MEGAMUX PLUS Instruction Manual GDC publication 036R360 for dip switch and jumper placement on the TID-III Module: Once the hardware is configured, the user will establish the application modes for the TID-III using the MEGAMUX PLUS supervisory controller.

  • Page 86: Tid-Iii Module Configuration

    Configuration 5-17 TID-III Configuration Requirements With the variety of features and operation flexibility available with the TID-III module, it is im- portant to review system communications requirements and constraints before attempting module set-up. The factors to consider are: • Which type of TID-III module will be on the remote end of the link (e.g., TID-I, II, or III)? The answer to this question directs you to one of the system application modes.

  • Page 87: Tid-Iii Channel Configuration Constraints

    5-18 Configuration TABLE 5-1. TID-III CHANNEL CONFIGURATION PARAMETERS Mode Number Mode Name Description Accuracy Tracking When tracking an accurate clock with ±0.001 % rate offset on the transmitting end, the total rate offset through the TID- III on the receiving end is only ±0.003%. Program Tracking Allows the user to program the channel to control signal input and output rate offsets and to optimize communications...

  • Page 88: Overview

    6HFWLRQ#9=##6WDWXV#6FDQ Overview This section provides detailed information of the selection of status scans and the information provided by each status scan: GENERAL The Status Scan provides information on the current state of the MEGAMUX PLUS system. Dis- plays report either system status or the condition of individual MEGAMUX PLUS components. The displays are real-time, with immediate reporting of new system developments.

  • Page 89: General Status

    Status Scan GENERAL STATUS The General Status routine identifies problem areas in the MEGAMUX PLUS system. The General Status scan should be the first scan selected when scans are initiated; information gained from the General Status scan allows you to focus quickly on malfunctions with the Specific Scan. Use the cursor position keys and the Carriage Return key to select General Status from the Status Scan menu.

  • Page 90: Specific Status

    Status Scan SPECIFIC STATUS The Specific Status Scans report detailed information concerning each MEGAMUX PLUS com- ponent. When the Specific Status routine is selected from the Status Scan Menu, the following menu is displayed: *-STATUS SCAN DISPLAY MENU-* COMMON (TR/CK/EX) AUTO FRAME AGGREGATE POWER SUPPLY...

  • Page 91: Auto Frame Status Scan

    Status Scan T/R INSERV PRI (primary) or SEC (secondary) may be reported: This reports whether the primary or secondary Transmit/Receive Logic Plus module is operating (in non-redundant systems, PRI is always report- ed). COMMON FAULT ON or OFF may be reported. OFF indicates that no alarm conditions exist for the common set; ON indicates that an alarm condition exists.

  • Page 92: Redundancy Update

    Status Scan ON indicates that Alarm Cut-Off has been selected for the AUTO FRAME Plus module, and no alarms are being reported. OFF indicates that Alarm Cut-Off has not been selected for the card. SOFTWARE REV The revision level of software in Node M or Node S AUTO FRAME modules is reported. If the end-to-end firmware revision levels are not compatible, the status screen displays a soft- ware revision error message, as follows: *- SOFT REV.

  • Page 93: Aggregate Status Scan

    Status Scan Aggregate Status Scan The following display appears for the Aggregate Status Scan: STATUS SCAN FOR AGGREGATE NODE M NODE S LOOPBACK ________________________________________________________________________ * ALARM SCAN - NO ALARMS - The Aggregate Status Scan reports the following items: LOOPBACK LCL indicates that the aggregate interface of the Redundancy Control Plus module is in a local loopback condition.

  • Page 94: Channel Status Scan

    Status Scan Channel Status Scan When you select the Channel status scan from the Specific Scan menu, the following prompt ap- pears: ENTER CIRCUIT NAME OR NUMBER: The channel may be specified either by channel number or by the name assigned in the configu- ration.
  • Page 95 Status Scan When the ALARM SCAN or CONTROL STATES SCAN are selected from the SPECIFIC STA- TUS MENU, the displays are as follows: ALARM SCAN Reports the most recent alarm messages associated with each component. After displaying the mes- sages, you are allowed to delete messages already displayed. NOTE If a Channel Status Scan is selected for a PCM channel, the display will report only the alarm messages.

  • Page 96: Overview

    6HFWLRQ#:=##$ODUP#6FDQ Overview This section describes the Alarm Scan routines. The operating procedures for the routines are dis- cussed, and definitions are provided for each alarm message. GENERAL The Alarm Scan Routines allow you to display or print stored MEGAMUX PLUS alarm messag- es.

  • Page 97: Screen Display

    Alarm Scan SCREEN DISPLAY The screen display routine displays all stored alarms in a format suitable for the CRT screen. When you select the routine from the Alarm Scan Menu, alarm messages are displayed until the screen is filled; the next page of alarms (if any) is then displayed after a one-second pause. Press the control key and the S key simultaneously to freeze the display;...
  • Page 98 Alarm Scan TABLE 7-1. MEGAMUX PLUS ALARM MESSAGES Specified Component Alarm Message Description Common Set COMMON FAULT A hardware failure has occurred on the T/R Logic module, the Clock Generator module, or the Expansion module. COMMON FAULT CLEAR Indicates that Common Fault has been cleared. PRI TO SEC SWITCH The Redundancy Control module has switched the second- ary T/R Logic module and Expansion module into operation...
  • Page 99 Alarm Scan TABLE 7-1. MEGAMUX PLUS ALARM MESSAGES (Continued) Specified Component Alarm Message Description Aggregate Interface LOCAL LOOPBACL The Redundancy Control module at the specified node is in a local Interface loopback condition (transmit data is looped back to receive data at that node.) REMOTE LOOPBACK The Redundancy Control module at Node S is in a loopback condition.
  • Page 100 Alarm Scan Channel LOCAL LOOPBACK A loopback condition exists in the specified channel card at the specified node. Transmit data is being looped back to receive data at the interface between the channel module and the T/R Logic module. Refer to Section 8, Diagnostic Functions, for more information on different types of channel loopbacks REMOTE LOOPBACK...
  • Page 101 Alarm Scan 036R660-000, Issue 10...

  • Page 102: Overview

    6HFWLRQ#;=##'LDJQRVWLF#)XQFWLRQV Overview This section describes the Diagnostic Function routines provided through the MEGAMUX PLUS supervisory port CRT interface. The initiation of diagnostic routines is described; the purpose of these diagnostic routines is also discussed. These diagnostic functions are only part of the diag- nostic features available in the MEGAMUX PLUS TDM system.
  • Page 103 Diagnostic Functions Alarm Cut-Off The diagnostic routines allow you to set Alarm Cut-Off (ACO) on or off for the involved compo- nent. You may want to set ACO On to avoid generating alarm messages during a test; you may also want to set ACO Off, to use alarm messages in evaluating test results.
  • Page 104 Diagnostic Functions AUTO FRAME Diagnostics There are two additional diagnostics that can be performed for this card: Re-measure Aggregate Clock Under some rare circumstances, the AUTO FRAME may have powered up before the aggregate clock source is available. If this occurs, the AUTO FRAME module cannot determine the fre- quency to base the data frame on.

  • Page 105: Common Set, Auto Frame, Power Supply Diag Routines

    Diagnostic Functions COMMON SET, AUTO FRAME, POWER SUPPLY DIAG ROUTINES The Diagnostic Functions Menu is the entry point for all of the diagnostic routines. When you select the Common Set, Auto Frame, or Power Supply diagnostic routine (using the cursor position keys and the Carriage Return), the Status Scan for that component is displayed at the top of the screen.
  • Page 106 Diagnostic Functions NOTE When initiated, the Aggregate User Data Test disrupts all normal TDM data traffic. If the TDM system is Out of Sync, you will be allowed to initiate a User Data Test at the Node S supervisory port CRT interface, with data origin and loopback point at Node S. This test can de- termine if the Out of Sync problem is caused at Node S, or due to failures elsewhere in the system (see the following paragraphs).

  • Page 107: Channel Diagnostic Routines

    Diagnostic Functions If you are using external test equipment to generate a test pattern, connect the equipment to a channel interface. Using the cursor position keys and the Return key, select Aggregate from the Diagnostic Functions Menu. Select the DATA PATH TEST from the Diagnostics Menu in the same manner.

  • Page 108: Control State Scan And Test

    Diagnostic Functions Once the particular channel is specified, the status scan for the channel appears, along with the following diagnostic menu: ALARM SCAN CONTROL STATE SCAN DATA PATH TEST CONTROL STATE TEST Use the cursor position keys and the Return key to select one of the five routines. If you select the Alarm Scan, any alarm messages for the specified channel are displayed below the status scan.
  • Page 109 Diagnostic Functions The Control State Test allows you to change the state of control signals. There are several uses for the test: • When you are using special interface types created specifically for your system, you must use this routine to force signals On or Off. You may also modify a standard interface for a particular channel by forcing signals On or Off, or changing the state of a signal already forced On or Off.

  • Page 110: Synchronous, Asynchronous,Isochronous, Transition-Encoded, And Tid-Iii Channel Data Path Tests

    Diagnostic Functions Synchronous, Asynchronous,Isochronous, Transition-Encoded, and TID-III Channel Data Path Tests The same data path tests are available for synchronous, asynchronous, isochronous, and transi- tion-encoded channels. The TID-III data channel module only allows you to perform User Data Tests. Voice channel tests are described in subsequent paragraphs. There are three types of tests for these channels: BERT (Bit Error Rate Test) When this test is selected, a test data pattern is generated by the specified channel, and sent...
  • Page 111 8-10 Diagnostic Functions 036R660-000, Issue 10...
  • Page 112 Diagnostic Functions 8-11 The loopback point is always placed so that all channel circuitry is included in the loopback path. If the data origin and loopback point are the same (a local loopback), data is looped back at the interface between the channel and the MEGAMUX PLUS common cards. If the data origin and the loopback point are different (an end-to-end loopback), data is looped back at the interface be- tween the channel and the channel equipment.

  • Page 113: Voice Ii Cvsd, Pcm, Adpcm, And Asp Channel Data Path Tests

    8-12 Diagnostic Functions Voice II CVSD, PCM, ADPCM, and ASP Channel Data Path Tests The voice channel data path tests are designed to exercise the VF (ana-log) and digital components of the various voice channel modules. Test features include calibration or setting of voice output levels;...
  • Page 114 Diagnostic Functions 8-13 Otherwise, a discrepancy exists between stored channel parameters, and actual channel operation. If a different configuration is activated, and the levels set in the new configuration are the same as the stewed parameters for the previously active configuration the voice levels set by the Rev dB Levels routine remain, (the channel's voice output, level does not change to the levels set in the newly activated configuration Calibrate...
  • Page 115 8-14 Diagnostic Functions the data origin (a remote loopback), the signal is looped back (as a regenerated 1 kHz tone) at the VF interface of the remote channel. This test gives the most extensive test of a voice channel, be- cause the signal travels through the VF and digital sections of the voice channel module.
  • Page 116 Diagnostic Functions 8-15 036R660-000, Issue 10...
  • Page 117 8-16 Diagnostic Functions 036R660-000, Issue 10...

  • Page 118: Tandem Voice Channels Data Path Tests

    Diagnostic Functions 8-17 Follow these instructions to apply the Rcv dB Levels routine: Select the Channel diagnostics and Data Path Test as described above. Use the up or down cursor position keys to select RCV DB. Use the left and right cursor position keys to move the cursor to the Data Origin field. Use the up and down cursor position keys to select the Node M or Node S channel module for output level adjustment.
  • Page 119 8-18 Diagnostic Functions A Digital Test may also be selected for a tandem channel; the loopback point may only be Node M or Node S (there is no "through" selection to the far-end voice channel). The Rcv dB function may be applied to the voice channel in the local MEGAMUX PLUS link (it may not be applied to the far-end voice channel module).

  • Page 120: Technical Assistance Procedure

    TECHNICAL ASSISTANCE PROCEDURE Support Services and Training General DataComm offers two comprehensive customer support organizations dedicated to pre- and post-sale support services and training for GDC products. Corporate Client Services and Factory-Direct Support & Repair assist customers throughout the world in the installation, management, maintenance and repair of GDC equipment.
  • Page 121 8-20 Diagnostic Functions 036R660-000, Issue 10...

  • Page 122: Appendix A:tid-Iii Channel Module Performance

    Appendix A: TID-III Channel Module Performance 036R660-000 MEGAMUX PLUS TDM Appendix A-1 Issue 10 Operator’s Instructions...
  • Page 123 036R600-000 Appendix A-2 MEGAMUX PLUS TDM 036R660-000 Operator’s Instructions Issue 10...
  • Page 124 036R660-000 MEGAMUX PLUS TDM Appendix A-3 Issue 10 Operator’s Instructions...
  • Page 125 036R600-000 Appendix A-4 MEGAMUX PLUS TDM 036R660-000 Operator’s Instructions Issue 10...

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