Using ADTRAN ISU 512 and 512e With Cisco Routers

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    Article ID: 1664
    Q&A

     

     

      Using ADTRAN ISU 512 and 512e With Cisco Routers


     

    Q:

    Using ADTRAN ISU 512 and 512e With Cisco Routers

     

     

    A:

    Introduction

    This document outlines how to configure ADTRAN ISU™ 512 and 512e terminal adapters (TAs) to work with Cisco routers. The configuration of both the router and the ISU depends on the application. The applications discussed here are

    • a connection between two ADTRAN ISUs using BONDING Mode 1
    • a 512k connection to a router using Multilink PPP
    • a dial backup connection.

    Before You Begin Your Setup

    • For some applications, the ADTRAN ISU is required to support synchronous Multilink PPP. The ISU 512e supports synchronous MP, but the 512 does not.
    • To use Multilink PPP on a Cisco router, the software revision of the ISU must be up to date.

     

    Setting Up the ISU

    This configuration is used when the ISU connects to another ISU or other device that supports BONDING Mode 1. It is assumed that V.25 dialing is used (i.e., there is a Dialer Inband statement in the Cisco configuration). If your application uses DTR dialing, refer to Dial Backup Connection later in this Technical Support Note. Only the relevant options are addressed here.

    Configuration of the ISU 512/(512e):

     

    Dial Options = V.25 HDLC Flags
    Bit Rate = (Select the appropriate bit rate according to your bandwidth requirements up to 8x64K.)
    CTS Options = Follows RTS
    DTR Options = Idle When Off
    DSR Options = Off Idle + Test
    (Protocol = BONDING Mode 1)

    Connection To A Router Using Multilink PPP

    This configuration is for dialing into a router (or Internet service) that supports Multilink PPP. Again, it is assumed that V.25 dialing is used. If your application uses DTR dialing, refer to Dial Backup Connection later in this Technical Support Note.

    Configuration of the ISU 512e:

     

    Dial Options = V.25 HDLC Flags
    Bit Rate = (Select the appropriate bit rate according to your bandwidth requirements up to 8x64K.)
    CTS Options = Follows RTS
    DTR Options = Idle When Off
    DSR Options = Off Idle + Test
    Method = Multilink PPP

    If there is a second number to dial, store it in Stored Number 1. This option is found in the Dial menu, under the Store/Review # option.

     

    When configuring the Cisco Router:

     

    In the relevant serial interface, there must be a Dialer Inband statement containing the number to be dialed. There should also be a Dialer Map statement mapping the appropriate network address to the serial port.

    Dial Backup Connection

    This configuration is generally used for a dial backup connection to T1 or Frame Relay. It is assumed that the Cisco device initiating the dial backup connection is using a Dialer DTRcommand to initiate the call. The configurations will differ slightly depending on whether the desired connection is to be 56/64k or 112/128k, as well as whether the unit initiates or answers the call.

    Configuration of the ISU:

     

    Dial Options = Front Panel
    Bit Rate = (Select the appropriate bit rate according to your bandwidth requirements up to 8x64K.)
    CTS Options = Forced CTS
    DTR Options = Dial #0 If On (dialing unit only)
    DTR Options = Ignore DTR (answering unit only)
    DSR Options = Off Idle + Test
    Protocol = (Use BONDING or Multilink PPP depending on your application.)

    On the dialing unit, store the dialing number in Stored Number 0. This option is found in the Dial menu, under the Store/Review # option. If you are using Multilink PPP, store the second phone number to dial in Stored Number 1. If no number is stored in Stored Number 1, the same phone number is dialed to establish the second link.

    If you experience any problems using your ADTRAN product, please contact ADTRAN Technical Support.