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Leased Backup Connection
Use the following steps to connect the modem to the 2-wire leased backup network interface:
1. Insert the 8-position, 8-conductor modular plug into the jack labeled DIAL (Figure 2).
2. Insert the other end of the modular cord into the leased-line network interface.
Dial Backup Connection
Use the following steps to connect the modem to the dial network interface:
1. Insert the 6-position, 4-conductor modular plug into the jack labeled DIAL (Figure 2).
2. Insert the other end of the modular cord into the dial network interface.
Network Management System Connection
Use the following steps to connect the modem to the network management system (NMS) interface:
1. Insert the sub-miniature, 4-conductor modular plug of the 3600 Hubbing Device into the jack labeled
NMS (Figure 2). Refer to the 3600 Hubbing Device, Feature Number 3600-F3-300, Installation
Instructions, Document No. 3610-A2-GZ45, for a description of the 3600 Hubbing Device. Installation
for the 3920Plus is the same as for the 3610 DSU.
2. Connect the 3600 Hubbing Device to the network management system (Figure G-5 in Appendix G of the
Technical Reference Manual).
Removing and Replacing the Model 3920Plus Modem
To remove and replace the Model 3920Plus modem, perform the following steps:
1. Make sure the modem is offline. Press the modem's back panel power switch to OFF.
2. Disconnect the dc power cable from the connector on the back of the modem.
3. Disconnect the leased-line and dial modular cord(s) from the modem's back panel.
4. Disconnect the DTE interface cable(s) from the modem's back panel.
If the modem is to be removed for service, return it to the company using the procedures described in
Government Requirements and Equipment Return on page 11.
5. Install the replacement modem as described in the Model 3920Plus Modem Installation section, and
configure it the same way as the modem being replaced.
6
February 2002
3920-A2-GK47-10
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