Paradyne 392xPLUS operation manual Removing and Replacing the Model 3920Plus Modem

COMSPHERE 392xPlus Modems

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, 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).

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 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.

Model 3921Plus Modem Installation

CAUTION

When removing the Model 3921Plus from the carrier, always use a ground strap when handling the modem. Always store the Model 3921Plus in an antistatic bag when it is removed from the carrier.

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

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