Star Hub Talk Battery Audit - Nortel DMS-100 Series Maintenance Manual

4-8 Star Remote System automatic maintenance
If there is a Hub takeover and there is one DS-1 link between the Star Module
and the Star Hub, all stable calls and special connections on this DS-1 link
remain stable. If there are two DS-1 links between the Star Module and the
Star Hub, call takeover occurs. This means all stable calls are routed to the
second DS-1, depending on the number of free channels on that DS-1.
Power converter configuration
The method of load sharing the Star Hub uses depends on the power converter
configuration. The two power converter configurations are
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The half configuration means that only slots 3 and 20 have power converters
and supply power to the RCP and to drawers 1 to 9. A full configuration is
when the other two power converters are in slots 5 and 18 to supply power to
drawers 10 and 18.
The following describe the behavior of power converters in the Star Hub
remote.
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Takeback mode
When the failed unit returns to service, the subscriber lines in takeover are
redistributed back to their normal processor. No calls in the talking or ringing
state are lost when the unit returns to the normal mode of operation.

Star Hub talk battery audit

The Talk Battery Alarm feature periodically audits each Star Hub unit for the
presence of talk battery. If the audit does not detect talk battery, operating
company personnel are notified with a critical alarm log report (PM179).
Loss of talk battery
The following figure shows talk battery power distribution within a Star
Remote Hub equipment (SRHE) frame.
297-8353-550 Standard 05.01 March 2001
full configuration - four power converters to support from 577 lines to 1152
lines using line drawers 10 through 18
half configuration - two power converters to support up to 576 lines in line
drawers 1 through 9
If one of the power converters is not installed, the unit without the power
converter is in the out-of-service state and the other unit works in takeover
mode.
If one of the main power converters (in slots 3 or 20) fail, then the power
converter of the other unit supplies power to the unit with the failed power
converter.
In a full configuration, if both of the power converters in slots 5 and 18 fail,
the Star Hub cannot support lines connected to line drawers 10-18.