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

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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.

RJ45	Adapter	Chain In Port	Description
1	7	GND	Ground - Connected to unit chassis
3	3	RXDATA	Data received by the TSU
5	2	TXDATA	Data 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".

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