Aastra OpenCom 100, Руководство по монтажу и пусконаладке

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Installation Power Failure
54
3.10.7 PCM Port
The PCM port is used cascade two communications systems together (see PBX Cas-
cading starting on page 148).
3.11 Power Failure
In the event of a power failure, all the contents in the memory (programme and
user data) are saved without change. The internal clock continues to run for
24 hours. If the power failure lasts longer than 24 hours, the time and date are
reset to the factory setting when power is switched on again. When the first
external outgoing call is made, the time and date are set to the current value as
given by the exchange.
On the multi-terminal access, the OpenCom 130 include an emergency service. In
the event of a power failure, the external S
0
1 port is switched over to the S
0
2 port
so that you can still use a connected telephone to make a call.
Emergency operation on a system access is not possible.