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COMSPHERE 392xPlus Modems
2-6 November 1996 3920-A2-GN31-30
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 2-1). Refer to Document Number, 3610-A2-GZ45,
3600 Hubbing Device, Featur
e 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).
Removing and Replacing the Model 3920
Plus
Modem
To remove and replace the Model 3920Plus modem, perform the following steps:
1.
Make sure the modem is of
fline. 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 Requir
ements 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.
Model 3921
Plus
Modem Installation
CAUTION
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.
The
Model 3921
Plus 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 3921
Plus singleport modems, and one shared diagnostic unit (SDU). The