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4

Network Management System
Connection

Use the following procedure to connect the modem to

the network management system interface:

1. Insert the subminiature 4-conductor modular plug

of the 3600 Hubbing Device (Figure 3) into the
jack labeled NMS (Figure 2).

2. Connect the 3600 Hubbing Device to the network

management system.

Refer to the 3600 Hubbing Device, Feature Number

3600-F3-300, Installation Instructions for more
information. Installation for the 3820Plus modem is the
same as for the 3610 DSU.

Modem Power-Up

Once your modem is properly connected to the DTE,

dial and/or leased lines, and ac outlet, press the modem’s
rear panel power switch to the ON position. The modem

begins a power-up self-test. This test takes several
seconds to perform, and verifies the operation of most
hardware components within the modem. If successful,
the LCD displays Power On Selftst Passed and continues
to the Top-Level menu screen.

F1

Power On Selftst
Passed

F2

F3

If a failure occurs during the self-test, the LCD may

display Power On Selftst Failed for several seconds. The
LCD then may display the Top-Level menu screen with
the message Power on Fail appearing on the top line of
the LCD. Although a failure has occurred, the modem
may attempt to operate. If it does, you can activate a more
thorough self-test using the Test branch. Refer to 
Chapter 6, Test Branch, in the COMSPHERE 3800Plus
Modems User’s Guide.

3000HUBBING DEVICE

 MODEL

 #3000-F3-300

8-Pin

Modular

Jacks

6 Inches

Overall

4-Pin

Modular

Plug

496-13775-03

8

1

Pin

Numbers

8

1

CC IN/DC OUT

CC OUT/DC IN

CC IN/DC OUT

Hubbing Device

CC OUT/DC IN

Figure 3. 3600 Hubbing Device

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