Maintenance Object Repair Procedures
555-233-123
10-778 Issue 4 May 2002
Expansion Interface LED Usage
The EI circuit pack has the standard red, green, and yellow LEDs. The red and
green LEDs have the traditional use, where red means some alarm condition and
green indicates maintenance testing in progress. The yellow LED is used to
provide useful visual status information. The state of the yellow LED is very
important when executing the EI Manual Loop Back Procedure previously
described.
Upon power-up, the TN776 red LED comes on and off, followed by the yellow
LED coming on solid. The TN570 red and green LEDs comes on and off. The
yellow LED remains off.
System Technician-Demanded Tests: Descriptions
and Error Codes
Always investigate tests in the order they are presented in the table below. By
clearing error codes associated with the Expansion Interface Reset Test, for
example, you may also clear errors generated from other tests in the testing
sequence.
Order of Investigation
Short Test
Sequence
Long Test
Sequence
D/
ND
1
1 D = Destructive; ND = Nondestructive
Expansion Interface Reset Test (#336) D
Expansion Interface Fiber Out-of-Frame Query
Test (#238)
XXND
Expansion Interface Lightwave Transceiver
Interface Loop Around Test (#242)
XD
Expansion Interface Control Channel Test (#316) X X ND
Expansion Interface Neighbor Query Test (#237) X X ND
Expansion Interface Local Loop Around Test
(#240)
XXND
Expansion Interface 2-Way Transmission Test
(#241)
XXND
TN570 Expansion Interface Packet Interface Test
(#589)
XXND
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