Control and port circuit pack status LEDs
Issue 4 May 2002
7-9
Control
Circuit
Packs
Red On briefly during power up and system reset. Steadily on if circuit pack
fails start-up test or fails while in use. Off during normal operation.
Green On briefly during board testing following power up and system reset. Also
on during periodic, scheduled, and system technician-demanded testing.
Off during normal operation.
Yellow Network Control
■ Lit when one of the data channels is in use
■ On the TN777B Network Control circuit pack, a 4th yellow
LED with the label “Card in use” is lit when the translation card
is in use.
Processor
■ Lit during processor initialization. Lit steady on the Active SPE
and off during normal operation on the Standby SPE. Memory.
■ Lit during system initialization (stays lit until Emergency
Transfer is turned off). Lit steady on the Active SPE and off
during normal operation on the Standby SPE.
Packet Control
■ Lit when at least one Packet Control is in use. Packet Control
LEDs do not light up (not even for the test led command) if
the packet feature is not enabled on the Systems-Parameters
Maintenance screen.
Tone Detector/Generator
■ Slow blinking when clock is in use. Otherwise, off.
Processor Interface
■ Lit when one (or more) channels (links) is in use. Otherwise,
off.
Duplication Interface
■ Lit steady on the Active SPE and dark during normal
operation on the Standby SPE. Exception: Duplication
Interface Circuit Pack A has the yellow LED lit steady if
Tone/Clock Circuit Pack 1B is active, regardless of which SPE
is active and which is standby.
Table 7-1. Circuit Pack Status LEDs — Continued
Equipment
Type LED Description
Continued on next page
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