3.6.57
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3.6.58
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4.
3.6.59
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3.
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3.6.60
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3.6.61
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3.6.62
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3.6.63
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3.
Powerfail Stations:
Check station internal wiring (refer to 3.6.7).
Replace powerfail station.
Background Music Control:
Check the background music source can be heard at SDF. Input impedance of the system
is 600 ohms.
Check that the station is functioning (station test).
Change ETSB board.
Change ESTB board for the station.
Alarm:
Check that the system is correctly programmed for open or closed contact alarm condition.
Check that the external alarm has operated.
Check the wiring from the alarm to the main equipment.
Change ETSB board.
Change DSS console if LED doesn’t light.
Alarm:
Check that the external alarm has turned off.
Switchhook Flash/Earth Recall:
Check system programming for switchhook flash or earth recall. Switchhook flash or earth
recall appears as the last line key on the station. Note that earth recall only functions on
lines assigned as PBX lines.
Check that earth recall board is correctly installed.
E G D B - A
N616
EGPB-A
With earth recall, check that a signal earth has been connected to the main equipment ER
connection (on SDF block)
Try switchhook flash or earth recall from a different station, if it works, change first station.
Call Metering Unit:
Check that the Call Metering Unit is installed as follows:
LA,LB:
Exchange Line
A, B:
Main Equipment Exchange Line Connection
CMU+ and CMU- from Main Equipment
E:
Telecom Earth
Check that metering pulses are provided on exchange line.
Replace Call Metering Unit
Handsfree Console:
Check that station has power
light) and that switch K in the HFC is set to
Check station wiring for Handsfree Console
and ribbon connector in HFC.
Change Handsfree Console.
180
ISSUE 1