User Manual
SUPM1
page 45 of 94© KEYMILE December 2015 EN/LZTBU 372 129/1 RC
94
Functional Description
5.6 PSTN Maintenance
If for maintenance purposes a subscriber has to be removed from the MDF
(main distribution frame) or a SUPM1 unit has to be removed from the
XMC20 subrack, this should be done without interrupting ongoing calls. This
is accomplished, under the control of the signalling (H.248/MEGACO, SIP or
V5), by blocking a user port as soon as an ongoing call is terminated. This
process is called “shutdown” (deferred locking).
The administrative port state handling is supported in the V5CAS mode of
operation only.
5.6.1 Activation of the Shutdown Procedure
Shutting down a user port can be done in different ways:
• Port status: Shut Down:
A single subscriber port is shut down, i.e. it goes into the locked state.
• Unit status: Shutdown All Ports:
All enabled subscriber ports are shut down, i.e. they go into the locked
state.
The status of the shut down procedure can be observed by
• checking the unit status: Unit administrative state of all ports, or
• checking the port status: X.731 administrative state of any individual port.
Note that there is a timeout of 30 minutes after activating the “unit status:
Shutdown All Ports” button. If after 30 minutes not all user ports have been
locked a “Shutdown Timeout” (SHT) alarm is raised.
The SHT alarm is cleared as soon as the last subscriber becomes locked.
5.6.2 Deactivation of the Shutdown Procedure
The deactivation of the shutdown procedure of a user port can be done in
different ways:
• Port status: Unlock:
A single subscriber port is unblocked, i.e. it goes into the unlocked state.
• Unit status: Unlock All Ports:
All enabled subscriber ports are unblocked, i.e. they go into the unlocked
state.
5.6.3 Test Loop Procedure
For maintenance purposes the digital voice signal received by a subscriber
can be looped back towards the network.
The loop is transparent, i.e. the received voice signal is forwarded towards
the subscriber.
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