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Operating the DSU
4-33550-A2-GB20-10 February 1995
Figure 4-2. SDCP and Model 3551 DSU Faceplate
Both control panels have a 2-line, 16-character liquid
crystal display (LCD) and a keypad, through which you
can
• Monitor the unit’s health and status
• Initiate dial backup
• Initiate diagnostic tests
• Load or change the unit’s configuration, or how it
will operate
• Enable or disable the DSU’s, DBM’s, or port’s
transmitter
• Display or change the status of the general purpose
external DTE leads.
The DCP’s LCD displays the result of any command
initiated from the DCP.
Refer to Appendix C to understand the meaning of
DCP status indicators.
Keypad
There are seven keys on the DCP of the standalone
Model 3550, and eight on the SDCP for the carrier-
mounted Model 3551 DSU. The additional key, the Select
key, connects the SDCP to a specific DSU located in a
specific carrier and slot within the carrier.