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4 — Ground and power connections
4.4
Startup diagnostics
At power-up, the unit goes through a startup sequence that includes a number of
startup diagnostic tests (or self-tests). The startup sequence should last for less than
1 minute. Figures 4-5 and 4-6 show the location of the LEDs. When the
2902 MainStreet unit is powered up without any LIMs or data interface modules
installed, the LEDs light up as described in Tables 4-1 and 4-2.
Once the startup sequence is finished, the LED indications depend on the node
configuration. See chapter 24 in Maintenance for descriptions of the visual indicators
or if the indicators do not light in the pattern described.
Once the diagnostic tests have run successfully, you are ready to initiate a node
management session, as described in chapter 10 in Configuration .
4-6
Wait until the diagnostic tests are completed before
Note —
attempting to rectify a problem.
Figure 4-5 Front panel self-test indicators
2902 MainStreet
Network Termination Unit
Figure 4-6 Rear panel self-test indicators
Slot 2
P1
Rx-1
Tx-1
Slot 1
Power
Event Status
Out of Sync 1
System Status
Out of Sync 2
Event Status
System Status
Loop
U
1
2
Display
EDG Sig/Gnd
P2
Rx-2
Tx-2
Line-1
Line-2
Modem
Terminal
2902 MainStreet Technical Practices
Processor
Power
Processor
Out of Sync 1
Out of Sync 2
8831
Status
I
O
Alarm
Loop
Status
U
1
2
Display
8832
90-2906-01
May 2002
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