Connecting a Modem to the Control In, Chain In, or Craft Port of an ADTRAN Product

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    Article ID: 1581
    Q&A

     

     

      Connecting a Modem to the Control In, Chain In, or Craft Port of an ADTRAN Product


     

    Q:

    Connecting a Modem to the Control In, Chain In, or Craft Port of an ADTRAN product

     

     

    A:

    Introduction

    This Technical Support Note describes how to connect a modem to an ADTRAN TSU's Control-In, Chain-In, or Craft port. To connect directly to a terminal, see the related articles link in the right hand pane of this window.

     

    Before you begin

    Connecting a Modem to an ADTRAN TSU requires a straight through RJ-45 cable and an adapter. If you do not have an adapter, you can use the following table to assemble one or order one from ADTRAN.

     

    RJ45AdapterChain In PortDescription
    17GNDGround - Connected to unit chassis
    33RXDATAData received by the TSU
    52TXDATAData transmitted by the TSU

     

    Connecting the modem to the TSU

    The remote modem can be connected to the TSU using one of three different adapters:

    • DB25 Male to RJ45 adapter (ADTRAN part number 3196ADAPT.004) which can connect directly into the remote modem as shown in Figure 1.
    • DB25 Female to RJ45 adapter (ADTRAN part number 3196ADAPT.003) which requires a DB25M to DB25M serial cable to connect to the remote modem as shown in Figure 2.
    • DB9 Female to RJ45 adapter (ADTRAN part number 3196ADAPT.001) which requires a DB9M to DB25M serial cable to connect to the remote modem as shown in Figure 2.
    Figure 1
    Figure 2
    1. Connect one end of the RJ-45 straight through cable to the Control-In, Chain-In, or Craft port of the ADTRAN TSU or TDU.
    2. Connect the other end of the RJ-45 cable to the adapter.
    3. Connect the adapter to the serial port of the modem, using a straight through serial cable if needed.
    4. The remote modem must have the following settings:
      DTR:ignored
      Verbal Result Codes:enabled
      Result Codes:suppressed
      Echo:off
      Auto Answer:enable
      Carrier Detect (CD):normal
      Compression:none
      Error correction:none
      Flow control:none
      Set the remote modem for:
      • 9600 BPS
      • 8 data bits
      • no parity
      • 1 stop bit
      The remote modem needs to be configured with AT commands which are stored into non-volatile memory using the &W command. That way, if the remote site loses power, it will automatically come back up with the correct configuration. Some examples of common initialization strings are listed below. Consult your modem manual for the correct commands:

      Hayes - AT&F&Q0&D0&K0S0=1N0S37=9&C1&W0
      USR - AT&F0&D0&HOLI0&KD&M0&N6S0=1&C1&W0
      Multitech - AT&F8&F0&D0&E3&E14&E10$SB9600$MB9600S0=1%ES&W0
      Boca - AT&F&D0&K0&Q0N0%C0S0=1S37=9&W0
    5. Set the host modem for:
      • 9600 BPS
      • 8 data bits
      • no parity
      • 1 stop bit
      The host modem does not have to have settings stored in non-volatile memory. However, it needs to be configured to connect with the remote modem using AT commands. Consult your modem manual for the correct commands.
    6. Terminal settings on the PC are as follows:
      Rate:9600
      Data Bits:8
      Parity:None
      Stop Bit:1
      Flow Control:None
      Terminal Emulation:VT 100
    7. Hold down the CTRL key and enter "PTT" on the keyboard for TSU and TDU units.  Simply press enter a few times for other units.
    8. The unit will respond with a menu screen.

    Note: All units will respond with a menu screen, except for 2nd generation TSU MUX products. These units will request a password. The default password is "ADTRAN".