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PairGain CRA-C User Manual

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  • Page 2 Megabit Modem CRA-C User Manual P/N 425-613-150-02 Revision 02 May 1998 Copyright © 1998. PairGain Technologies, Inc. All rights reserved. This document contains proprietary information which is protected by copyright. Information contained in this document is company private to PairGain Technologies, Inc.

  • Page 3: Fcc Notice

    Consult the dealer or an experienced radio/TV technician for help. Any changes or modifications not expressly approved by the grantee of this device voids the user’s authority to operate the equipment. Megabit Modem CRA-C User Manual...

  • Page 4: Declaration Of Conformity

    Place: Date: PairGain Technologies, Inc. 14402 Franklin Ave Tustin, CA 92780-7013 U.S.A. Megabit Modem CRA-C EN55022 (1987), EN50082-1 (1992), EN60950 (1994) 89/336/EEC, 73/23/EEC Roy Stephens, Director of Quality Assurance Tustin, CA, U.S.A. March 16, 1998 Megabit Modem CRA-C User Manual...

  • Page 5: Using This Manual

    • understand the features of the PairGain and how the unit operates as a component within a network • install the Megabit Modem CRA-C • configure your unit to operate within the network • contact PairGain if you need additional help Three types of messages with icons appear in the text: Notes inform you of special circumstances.
  • Page 6 Using This Manual Megabit Modem CRA-C User Manual...

  • Page 7: Table Of Contents

    CONTENTS ABOUT THE MEGABIT MODEM CRA-C __________________ 1 About Rate Adaptive Transmission... 2 Rate Adaptation... 2 Reach, Data Rate, SNR Margin, and Noise Environment... 4 INSTALL THE MEGABIT MODEM CRA-C_________________ 7 Unpack and Inspect the Shipment ... 7 Identify LEDs and Connectors ... 9 Front Panel ...
  • Page 8 Contents NETWORK AND MANAGEMENT OVERVIEW ____________ 51 MAC Layer Bridging and Spanning Tree Protocol ... 51 Static IP Routing... 53 Megabit Modem CRA-C IP Addresses ... 59 Management Protocols... 61 SNMP ... 61 Megabit Modem CRA-C SNMP Agent ... 62 MIB and Trap Support ...

  • Page 9: About The Megabit Modem Cra-C

    Subscriber Line (ADSL) technology to provide, on a single pair telephone line, a multi-megabit Ethernet connection between the subscriber and the service provider. The Megabit Modem CRA-C transmits data up to 3.16 Mbps from a service provider and receives data up to 1.08 Mbps from a subscriber. The Megabit Modem CRA-C is rate adaptive;...

  • Page 10: About Rate Adaptive Transmission

    About the Megabit Modem CRA-C Use the Megabit Modem CRA-C with these other PairGain products: • Megabit Modem CRA (at subscriber site) • S1 Network Interface Device (network interface at subscriber site) About Rate Adaptive Transmission The following definitions are useful for understanding the operation of the Megabit Modem: •...
  • Page 11 The Megabit Modem CRA-C can be set to any one of three modes that determine how the data rate is selected. It is important to note that rate adaptation occurs only during startup. The Megabit Modem CRA-C will not change its data rate while the link is up. The three startup modes are: •...

  • Page 12: Reach, Data Rate, Snr Margin, And Noise Environment

    PairGain does not guarantee performance to the figures shown. One of the configuration options in the Megabit Modem CRA-C is the startup margin setting. This setting defaults to 6 dB but may be set from -3 dB to 9 dB. The modems will attempt to come up at the programmed margin setting.
  • Page 13 About the Megabit Modem CRA-C Figure 1. Reach for a Rate Adaptive ADSL Megabit Modem Megabit Modem CRA-C User Manual...
  • Page 14 About the Megabit Modem CRA-C Megabit Modem CRA-C User Manual...

  • Page 15: Install The Megabit Modem Cra-C

    If you must store the equipment for a prolonged period, store the equipment in its original container. The shipping carton contains, in addition to the Megabit Modem CRA-C and this manual, the cables described in Table 1.
  • Page 16 Do not tamper with the power supply safety prong. It is a critical element for the secondary lightning protection provided within the Megabit Modem CRA-C. If you tamper with the safety prong, you risk serious injury. Function Connects the Megabit Modem...

  • Page 17: Identify Leds And Connectors

    Install the Megabit Modem CRA-C Identify LEDs and Connectors The Megabit Modem CRA-C front panel has LEDs that show status for power and data transmission. The rear panel has external interface connectors and a power switch. Front Panel Figure 2 and Table 2 describe the LEDs on the Megabit Modem CRA-C front panel.
  • Page 18 Install the Megabit Modem CRA-C Table 2. Front Panel LEDs Mode Description Power Green Indicates power is on. 10BASE-T LINK Green Ethernet connection up. Ethernet connection down. Green Transmit activity at port. No transmit activity at port. Green Collisions occurring on the port.

  • Page 19: Rear Panel

    Rear Panel Figure 3 and Table 3 describe the Megabit Modem CRA-C rear panel features. Figure 3. Megabit Modem CRA-C Rear Panel Table 3. Rear Panel Components Name Function POWER connector 6-pin mini-DIN type port that supplies power to Megabit Modem CRA-C.

  • Page 20: Install The Megabit Modem Cra-C

    Install the Megabit Modem CRA-C Install the Megabit Modem CRA-C Complete the steps in the order listed to install the Megabit Modem CRA-C: • connect to the ADSL line • connect to the data network Connect to the ADSL Line The Megabit Modem CRA-C requires a single pair of telephone wires to connect the subscriber to the service provider.

  • Page 21: Connect To The Data Network

    Table 4. ADSL Pin Assignments for RJ-45 Connector Connect to the Data Network The 10BASE-T MDI-X port connects the Megabit Modem CRA-C to the data network. If the data network has an MDI-X port, use the yellow cross-over Category 3 or better cable. If the data network has an MDI port, use the black straight-through Category 3 or better cable.
  • Page 22 Install the Megabit Modem CRA-C Figure 5. Straight-through and Cross-over Cable Pinouts Megabit Modem CRA-C User Manual...
  • Page 23 Connect to the data network using either the black straight-through cable or the yellow cross-over cable: Plug the RJ-45 connector of the Category 3 cable into the 10BASE-T MDI-X connector on the Megabit Modem CRA-C rear panel (Figure 6). Attach the other end of the Category 3 cable to the 10BASE-T port of your data network.

  • Page 24: Power Up And Check Leds

    Install the Megabit Modem CRA-C Power Up and Check LEDs Install the power cable and power up the Megabit Modem CRA-C: Plug the mini-DIN connector on the wall-plug supply into the power connector on the rear of the Megabit Modem CRA-C, then plug the wall-plug supply into the facility power.

  • Page 25: Configure And View Status

    CONFIGURE AND VIEW STATUS In this chapter, you configure the Megabit Modem CRA-C or view system status using an ASCII terminal connected to the console port. Go to the following sections: To complete this task Connect to an ASCII terminal...
  • Page 26 Figure 7. Connecting to an ASCII Terminal Configure these communication settings for the ASCII terminal: • 9600 to 19,200 baud • no parity • 8 data bits • stop bit • flow control to OFF Select ANSI for terminal emulation. Megabit Modem CRA-C User Manual...

  • Page 27: How To Log On And Navigate The Menus

    ATU-C is the ADSL Transceiver Unit (ATU) at the service provider site which is the Megabit Modem CRA-C. ATU-R is the remote Megabit Modem CRA at the subscriber site Log on to the Megabit Modem CRA-C: Press the spacebar several times to activate the autobaud feature and to display the Logon Password screen.
  • Page 28 MAIN MENU 1. SYSTEM STATUS AND CONFIGURATION 2. ADSL MENU 3. BRIDGE/ROUTER MENU 4. REMOTE LOGON Q. LOGOUT ENTER CHOICE--> See the section, "Configure System Settings," to establish a new password. ENTER ENTER 08:43:18 01.01 Megabit Modem CRA-C User Manual...
  • Page 29 Configure and View Status Figure 8 shows the structure for the Megabit Modem CRA-C menus. Type the number of the menu item you want to view or configure. Figure 8. Megabit Modem CRA-C Menu Structure Megabit Modem CRA-C User Manual...
  • Page 30 Selects the next page. Selects the previous page. Restores previous setting by undoing the last action. When configuring Megabit Modem CRA-C parameters: Toggle among predefined optional settings (for example, select STARTUP OPTION in the ADSL Configuration Menu and then toggle through the choices) as follows: Type the number of the option.

  • Page 31: How To Configure A Remote Unit

    How to Configure a Remote Unit From the Megabit Modem CRA-C, you can view system parameters and set configuration options for the remote Megabit Modem CRA. The remote console menu header reflects the remote unit as ATU-R. This shows that the console program is physically connected to the unit at the service provider site (ATU-C), but is virtually configuring the unit at the subscriber site (ATU-R).

  • Page 32: Configure System Settings

    ATU-C ADSL MEGABIT MODEM TERMINAL SYSTEM CONFIGURATION 1. CHANGE SYSTEM TIME 2. CHANGE SYSTEM DATE 3. CHANGE PASSWORD 4. FACTORY DEFAULT CONFIGURATION (R)eturn ENTER CHOICE--> to display the System Status and 08:43:23 01.01 08:54:52 01.01 (M)ain Megabit Modem CRA-C User Manual...
  • Page 33 Press the spacebar several times to autobaud. You must then log in again. All ADSL transceiver and Ethernet bridge values are now at default values, including the password. Megabit Modem CRA-C User Manual Configure and View Status ENTER ENTER...

  • Page 34: Configure Adsl Transceiver

    "View Status" (page 41) for more information on options 1 through 4. Configure parameters for ADSL data transmission in the "Configuration" section that follows. Then, reset the Megabit Modem CRA-C to make the changes effective using the "Reset the ADSL Transceiver" section (page 29).
  • Page 35 Select a maximum data rate for the upstream channel (from Data subscriber to service provider). Use the spacebar to scroll Rate through the available rates. Megabit Modem CRA-C User Manual Configure and View Status and have made changes to the ADSL Save current settings (continued)
  • Page 36 BER operation. until you highlight the alarm you ENTER ENTER to select. Megabit Modem CRA-C User Manual...

  • Page 37: Reset Adsl Transceiver

    Session ADSL Select this option to reset and use the data rates Reset acquired during the previous full startup rather than re-assessing the signal quality data and determining new rates. Megabit Modem CRA-C User Manual Configure and View Status 08:44:57 01.01...

  • Page 38: Configure The Bridge/Router

    Select either the "Configure as a Bridge" section (page 31) or the "Configure as a Router" section (page 34). After you change Bridge/Router Configuration or the SNMP Configuration options, "Reset the Ethernet bridge" (page 40) to make the changes effective. 08:55:55 01.01 00-20-A7-20-68-F2 LINK UP READY Megabit Modem CRA-C User Manual...

  • Page 39: Configure As A Bridge

    Select, using the spacebar, or type in the appropriate information for each option as indicated in Table 10 ENTER ENTER then press Megabit Modem CRA-C User Manual Configure and View Status , type Save current setting (Y/N) 08:54:11 01.01 BRIDGE 192.168.240.10...
  • Page 40 If it is, the modem sends messages directly to the host. If it is not, the Megabit Modem CRA-C sends messages through a default router. The default is 255.255.255.0 Boot Router...
  • Page 41 The code is valid if the CRC calculated on power-up matches the expected CRC. If it does not, the Megabit Modem CRA-C attempts to get a new image using the TFTP. Set Network (with local backup) to attempt to download the image file over the network.

  • Page 42: Configure As A Router

    Y to display the screen below. Ensure the mode setting is Router. The following screen shows configuration for a Megabit Modem CRA-C (ATU-C) routed toward a remote Megabit Modem CRA (ATU-R), using IP addresses from the example in Figure 12.
  • Page 43 The following screen shows configuration for a Megabit Modem CRA (ATU-R) routed toward a Megabit Modem CRA-C (ATU-C), using IP addresses from the example in Figure 12. 07/02/97 PAIRGAIN TECHNOLOGIES ATU-R ADSL MEGABIT MODEM TERMINAL BRIDGE/ROUTING CONFIGURATION MENU --------------------------------------------------------------- MODE SETTING 1.
  • Page 44 Consists of the Destination, Subnet Mask, and Routing Gateway. Must be configured for the Megabit Modem Table CRA-C to operate as a static IP router. 0.0.0.0 is the format for each field and the default. LAN IP Input the network address of the Megabit Modem Addr CRA-C 10BASE-T port.
  • Page 45 The code is valid if the CRC calculated on power-up matches the expected CRC. If it does not, the Megabit Modem CRA-C attempts to get a new image via the TFTP. Set Network (with local backup) to attempt to download the image file over the network.

  • Page 46: Configure Snmp

    Type the number of the option you want to configure. Select, using the spacebar, or type in the appropriate information for each option as indicated in Table 12 then ENTER ENTER press 08:53:26 01.01 public private ENABLE 0.0.0.0 public 0.0.0.0 public Megabit Modem CRA-C User Manual...
  • Page 47 Private. The read-only community string setting must match the network manager community string setting of Public or Private. The authentication string is required for the Megabit Modem CRA-C to correctly respond to SNMP set and get requests. SNMP Read Provides the authentication string used for SNMP Write Comm read-write operations.

  • Page 48: Reset The Ethernet Bridge

    Reset. Type either Y for yes to Reset or N for no to cancel Reset. When you select Y to Reset, the Megabit Modem CRA-C Ethernet link is dropped, the bridge is reset, then the Ethernet link is re-established. The changes made to the Ethernet bridge are now effective.

  • Page 49: View Status

    TRANSCEIVER HARDWARE NUM HARDWARE REV BRIDGE MODULE SOFTWARE REV PROM CHECKSUM HISTORY DAY IN OPERATION (R)eturn (M)ain ENTER CHOICE--> Megabit Modem CRA-C User Manual Configure and View Status on the Main Menu then 08:43:44 01.01 ATU-C ATU-R 1704-01 1704-02 01/01/96...

  • Page 50: Adsl Transceiver Status

    Select options 1 through 4 to view status for the ADSL transceiver. The ADSL ES counts, UAS counts, and minimum SNR margins are updated every second and can be viewed from the ADSL Performance History screens shown on pages 43 through 47. 08:44:57 01.01 Megabit Modem CRA-C User Manual...
  • Page 51 Type to clear the ADSL performance and alarm counters. This also clears the counts in the remote Megabit Modem CRA. Table 13 describes the ADSL Performance Status screen fields. Megabit Modem CRA-C User Manual Configure and View Status 08:45:10 01.01...
  • Page 52 24-hour period. This figure represents the amount of time that the lines were not available for transmission since power on or last clear. Data Rate (kbps) Identifies the actual data rates of the ADSL link. –7 . The system provides a default –10 Megabit Modem CRA-C User Manual...
  • Page 53 The minimum SNR for the period is reset to the current SNR. The 24 Hour ADSL Performance History data is lost when the Megabit Modem CRA-C is turned off. Megabit Modem CRA-C User Manual Configure and View Status 08:45:54 01.01...
  • Page 54 ES and UAS counts, including the equivalent counts in the remote unit. The minimum SNR for the period is reset to the current SNR. The 7 Day ADSL Performance History data is lost when the Megabit Modem CRA-C is turned off. 08:46:07 01.01 UPSTREAM 13.1...
  • Page 55 E N T E R C H O I C E - - > Type to update the first and last date/time stamps and clear the time to 0. The Alarm History data is lost when the Megabit Modem CRA-C is turned off. Table 14. ADSL Alarm History Screen Columns Name Description Type Identifies local, remote, and ADSL link alarms.

  • Page 56: Ethernet Bridge Statistics

    Configure and View Status Ethernet Bridge Statistics The Megabit Modem CRA-C provides real-time, non-disruptive monitoring of system performance. This menu displays a count of the valid Ethernet and ADSL frames received and forwarded by the 10BASE-T MDI-X and the line ports, respectively.

  • Page 57: Log Out

    Errored Frames The number of frames received in error (CRC, alignment, and dribbling bit) from the input buffer. Log Out Log out from the Main Menu by pressing Megabit Modem CRA-C User Manual Configure and View Status...
  • Page 58 Configure and View Status Megabit Modem CRA-C User Manual...

  • Page 59: Network And Management Overview

    NETWORK AND MANAGEMENT OVERVIEW Through the console menus, you can configure the Megabit Modem CRA-C as a bridge to forward Ethernet data based on MAC addresses or as a router to route Ethernet data based on IP addresses. Additionally, you can configure parameters for management and encapsulation protocols using the Megabit Modem CRA-C console menus.
  • Page 60 Network and Management Overview Figure 9. Spanning Tree Topology Megabit Modem CRA-C User Manual...

  • Page 61: Static Ip Routing

    You can enable or disable Spanning Tree on the Bridge/Router Configuration Menu. The Megabit Modem CRA-C uses the Spanning Tree defaults shown in Table 16. These values are user-configurable through SNMP as part of the Spanning Tree group in RFC 1493.
  • Page 62 Network and Management Overview Figure 10. Simple Configuration for Static IP Routing Megabit Modem CRA-C User Manual...
  • Page 63 Figure 11 shows a more complex example of multiple gateways that use static IP routing to route packets sourced from specific users to different destination gateways. Figure 11. Multiple Gateways Specified for Static IP Routing Megabit Modem CRA-C User Manual...
  • Page 64 Default Router Specify the next hop default router entry. This entry tells IP Address Megabit Modem CRA-C what to do with a packet that has a destination address which is not in the Static IP Routing table. IP Static Specify up to three static routes and one default route. The...
  • Page 65 Destination, Mask, and Next Hop Gateway. Destination is the remote IP subnet or host address. Gateway is the IP address of the Megabit Modem CRA-C on the same subnet as the external router. Megabit Modem CRA-C User Manual...
  • Page 66 Network and Management Overview Figure 12 shows an example of a point-to-point ADSL system and hypothetical values of parameters defined in Tables 17 and 18. Figure 12. Example for Static IP Routing Megabit Modem CRA-C User Manual...

  • Page 67: Megabit Modem Cra-C Ip Addresses

    Network and Management Overview Megabit Modem CRA-C IP Addresses The Megabit Modem CRA-C has two IP addresses, one for the ADSL WAN port and one for the Ethernet port. In Figure 13, the non-shaded side of the provider and subscriber modems indicates the LAN address for the Ethernet (10BASE-T) connection.
  • Page 68 Network and Management Overview Figure 13. IP Addresses Megabit Modem CRA-C User Manual...

  • Page 69: Management Protocols

    This management protocol specifies how to send information between a Network Management System (NMS) and managed devices on a network. Managed devices (such as the Megabit Modem CRA-C) run a program called an agent. The agent interprets SNMP requests and responds to them. The...

  • Page 70: Megabit Modem Cra-C Snmp Agent

    Megabit Modem CRA-C SNMP Agent An agent is program resident in managed devices (for example, Megabit Modem CRA-C, modems, nodes, routers and hubs). Agents translate data into code the NMS can read. Agents and NMS communicate using SNMP as the transport mechanism.

  • Page 71: Mib And Trap Support

    The Megabit Modem CRA-C provides an SNMP agent that supports several MIBs for the management of the system. The SNMP agent can process datagrams received from both the Ethernet interface (LAN) and the ADSL interface (Line). The agent and the protocol stack complies with the following RFCs: •...

  • Page 72: Network Configuration And Image Code Download

    BOOTP BOOTP is used to supply network configuration information to Megabit Modem CRA-C from a BOOTP server. Used in conjunction with TFTP, you can use BOOTP to download image code. The Megabit Modem CRA-C initiates a BOOTP request in these situations: current configuration sector is determined to be invalid;...
  • Page 73 WAN link. If a BOOTP server is on the local network and is configured correctly, it returns a BOOTP response. Once the Megabit Modem CRA-C receives a BOOTP response, it keeps the IP address, boot server, default router, and any other information associated with the module in the configuration sector of the flash.

  • Page 74: Tftp

    Image Load Mode to NETWORK, save the configuration to flash, and reboots the Megabit Modem CRA-C In either case, the Megabit Modem CRA-C performs a BOOTP request first to get the most current network configuration. If the BOOTP fails, the TFTP session is attempted.

  • Page 75: Technical Specifications

    Depth Electrical Power Input Power Dissipation Environmental Temperature Relative Humidity Electromagnetic Emissions Megabit Modem CRA-C User Manual CAP Line Code up to 23 dBm RJ-48 RJ-45, 10BASE-T 14 Kpps (64-byte packets, both directions) 2.7 Kpps 2000 MAC addresses with aging Low-overhead HDLC or PPP IEEE 802.1d transparent with...
  • Page 76 ASCII Terminal Maintenance Port Type Data Rate Hardware Flow Control Agency Certifications FCC B PairGain reserves the right to change features and specifications without notice. RS-232C, RJ-45 Autobaud from 2400 to 19,200 baud Not Supported Megabit Modem CRA-C User Manual...

  • Page 77: Technical Assistance

    PairGain Management Information Bases (MIBs) are available using the Internet at ftp.pairgain.com, use: • ftp.pargain.com login using as you log-in name anonymous or your e-mail address as you user password guest enter cd snmp/rex/mibs • pgrexmib.txt Megabit Modem CRA-C User Manual...
  • Page 78 Technical Assistance Megabit Modem CRA-C User Manual...

  • Page 79: Limited Warranty

    PairGain's sole option, is determined to be defective upon examination at our plant. Do not disassemble the Megabit Modem CRA-C. The unit’s components are not user serviceable. Opening the system chassis, or attempting to modify the unit in any way voids its warranty.
  • Page 80 Pack the equipment in a shipping carton. Write clearly on the outside of the carton, PairGain’s address and the assigned Return Material Authorization Number: PairGain Technologies, Inc. 14352 Franklin Avenue Tustin, CA 92780-7013 Attention: Repair and Return Department Megabit Modem CRA-C User Manual...

  • Page 81: Glossary

    It is represented as a zero or a one. Bridge A two-port internetworking device that selectively filters or forwards traffic based or MAC addresses. Bridged A pair of wires connected in parallel across a single line to form a "T" Tap configuration. Megabit Modem CRA-C User Manual...
  • Page 82 Line noise that occurs due to coupling of signals between pairs in the same bundle. Downstream The direction of data reception from the Megabit Modem CRA-C to a remote unit. Ethernet A baseband LAN specification that has become a series of standards produced by IEEE referred to as IEEE 802.3.
  • Page 83 A person who performs work at home while linked to the office by means of a telecommunications- equipped computer system. Upstream The direction of data transmission from the Megabit Modem CRA-C to a remote unit. Unshielded Twisted Pair. Megabit Modem CRA-C User Manual Glossary...
  • Page 84 Glossary Megabit Modem CRA-C User Manual...
  • Page 86 Corporate Office 14402 Franklin Avenue Tustin, CA 92780 Tel: (714) 832-9922 Fax: (714) 832-9924 For Technical Assistance: (800) 638-0031...

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