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36 097-55501-01 Issue 6 – June 2003

TimeHub 5500 System Guide

If there is only one output card in the card group (non-redundant), the

sensing of a port alarm does not disable the output, hence it continues to

sample for the port alarm condition. In this situation the false port alarm

will always self-clear if the external cause is removed. Similarly, if the

second card in a redundant pair senses a port alarm after the first card has

sensed an alarm, the second card does not disable its outputs so it will

always self-clear upon removal of the external cause of the false port alarm.

1.3.9 Output Connector Modules

There are two types of output connector modules: DS1 and CC Output

Connector modules. Each module contains the hardware required to

interface with the output type (DS1 or CC). The output driver card reads the

output connector module to determine the appropriate voltage levels,

frequency, and format for the corresponding output type.

1.3.10 Connection Panels

Timing output connections between the TimeHub 5500 System and network

elements are made at the wirewrap connection panel. Each wirewrap

connection panel can accommodate up to 160 outputs.

1.4 Master/Remote Shelf

The TimeHub 5500 can be configured for use as a master shelf or as a

remote shelf. The essential difference between these configurations is that a

OTE

: The screen identifies that the C card group is the target

for clearing. Click the OK button to proceed with the attempt to

clear the alarm.

OTE

: The circumstance where a false port alarm will not self-

clear after the condition causing it is removed is when the false

alarm had been generated on only one output card in a

redundant pair. This could occur since each card independently

senses port alarms and could be impacted slightly differently by

injected noise. The effect could be that one card has its sense

line near but slightly below the alarm threshold (hence no

alarm); the other has its sense line near but slightly above the

alarm threshold (hence it alarms). When only one card alarms

(in a situation where there is a good standby) it effectively

remains latched in the alarm state because it disables itself and

becomes no longer able to test for poor alarms.

Symmetricom TimeHub 5500 System Manual

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