Symmetricom TimeHub 5500, Руководство пользователя

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097-55501-01 Revision M – January 2009 TimeHub 5500 User’s Guide 69
Chapter 2 Engineering Ordering Information
Card Overview
The LED status indicators on the Expansion Controller card are described in Table
2-9 .
When the Shelf Alarm LED is red, an alarm condition is detected by the Expansion
Controller card. The alarm is reported back through the Management card in the
master shelf. Specific alarms detected are:

Shelf Power A or B not detected. This illuminates the Alarm LED as well as
appropriate Shelf Power LED (red). Associated TL1 events are EXPWRA and
EXPWRB (Expansion Power Fail on terminal A or B).

The Expansion Controller card is receiving a good link but it is not associated
with its “preferred” master shelf clock.
The concept of a “preferred” Clock is used to better support redundancy. During
normal operation, each Expansion Controller card takes its clock from a different
Clock card. However, an Expansion Controller card can take its clock from either
Clock card so it is not critical that an EC card get its clock from its preferred source.
This alarm is reported simply to indicate the situation when this card is currently not
getting its clock from the preferred source. Specifically:
Table 2-9. Expansion Controller Card Front Panel Indicators
Indicator Color Description
Power Green

On = The card is receiving power

Off = No power present
Fuse Red

On = The Expansion Controller card fuse is open

Off = The Expansion Controller card fuse is not open
Shelf Alarm Red

On = An alarm condition is present

Off = No alarm condition is present
Fail Red

On = A hardware or firmware fault has occurred

Off = No hardware or firmware faults have occurred
Shelf Power Green/Red

Green = Power is being successfully supplied to the
associated shelf power terminal (A or B)

Red = Power is not being successfully supplied to the
associated power terminal
Expansion Links Green/Red

Green = Proper timing, framing, and communication is
coming from the Master shelf

Red = The link cable is attached but there is a problem
receiving either clock timing, clock framing, or
communication from the Master shelf

Off = The link cable is not connected, or the Clock
card(s) are in warmup mode