Maintenance Object Repair Procedures
555-233-123
10-702 Issue 4 May 2002
LEDs
Table 10-255 shows the 4 front panel LEDs that signal the following information:
SPE select switches
Each Duplication Interface circuit pack has a faceplate SPE-select switch with A,
B, or AUTO positions for determining which SPE is active. See Table 10-256:
Table 10-255. TN792 LED description
Color (from
top to bottom) Explanation
Red (top) Fault detected
Green Maintenance routine in progress on this circuit pack
Yellow Lit when in active carrier.
Flashing LED(s) means one of the following:
■ optical cable is not attached
■ optical cable is attached incorrectly
■ optical cable is broken
■ transmit or receive hardware on one or both circuit packs is
malfunctioning
■ one of the DUPINT circuit packs is bad
Red SPE select switches on both Duplication Interface circuit packs
are set the same (either SPE A or SPE B).
Both switches must be in the same position for this LED to light.
Continued on next page
Table 10-256. TN792 SPE-select positions
SPE A setting SPE B setting Effect
A A Forces carrier A active
B B Forces carrier B active
AB
Software determines active carrier
1
1 If the SPE select switches are in a locked position and either or both of the Duplication
Interface circuit packs are removed, the active SPE remains active, and no
SPE-interchange occurs.
BA
AUTO AUTO
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