Removing And Replacing The Model 3920Plus Modem; Model 3921Plus Modem Installation; Network Management System Connection - Paradyne COMSPHERE 3920PLUS Installation And Operation Manual

COMSPHERE 392xPlus Modems

Network Management System Connection

Use the following steps to connect the modem to the network management system (NMS)
interface:
Removing and Replacing the Model 3920 Plus Modem
To remove and replace the Model 3920Plus modem, perform the following steps:
Model 3921 Plus Modem Installation
The Model 3921Plus modems are designed for installation in a COMSPHERE 3000 Series Carrier,
which supplies both the operating power and the leased and/or dial network connections. For
additional information about the COMSPHERE 3000 Series Carrier, refer to the COMSPHERE
3000 Series Carrier, Installation Manual.
The COMSPHERE 3000 Series Carrier has 17 slots that hold up to 8 Model 3921Plus multiport
modems or 16 Model 3921Plus singleport modems, and one shared diagnostic unit (SDU). The
2-6
1. Insert the sub-miniature, 4-conductor modular plug of the 3600 Hubbing Device into the
jack labeled NMS (Figure 2-1). Refer to Document Number, 3610-A2-GZ45,
3600 Hubbing Device, Feature Number 3600-F3-300, Installation Instructions, 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-4 in
Appendix G).
1. Make sure the modem is offline. Press the modem's back panel power switch to OFF.
2. Disconnect the power cord from the ac power outlet.
3. Disconnect the dc power cable from the connector on the back of the modem.
4. Disconnect the leased-line and dial modular cord(s) from the modem's back panel.
5. 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 in Chapter 1.
6. Install the replacement modem as described in the Model 3920Plus Modem Installation
section of this chapter, and configure it the same way as the modem being replaced.
When removing the Model 3921 Plus from the carrier, always
use a ground strap when handling the modem. Always store
the Model 3921 Plus in an antistatic bag when it is removed
from the carrier.
November 1996
CAUTION
3920-A2-GN31-30