Isdn Layer 1 Status Display - NEC UNIVERGE SV9100 System Maintenance Manual

UNIVERGE SV9100

ISDN Layer 1 Status Display

Depending on the local operation of the ISDN BRI lines it may be useful to view the status of the lines.
Layer 1 operation of ISDN can vary based on functionality, territory or exchange connected to:
Layer 1 always ON – layer 1is always provided, and any dip in this indicates loss of link. In this case an alarm
is required and the ability to take the associated lines out of service on the SV9100.
Layer 1 Off on IDLE– layer 1 is off when idle, therefore it should not raise an alarm or take the associated
lines out of service.
Layer 1 Disconnect Supervision is set per Trunk using the following CMD:
PRG CMD 10-03-25 Layer 1 Supervision (Default Off)
Or Via Easy Edit:
Layer 1 Supervision is disabled by setting it to 0:"Off" (default)
When Layer 1 is deactivated or goes down due to a fault (plug disconnected), no alarm #10 shall be issued.
The circuit shall be considered to be usable.
When Layer 1 is activated again, no recover #10 shall be issued.
When the circuit is a trunk or leased line or network circuit, the associated ports shall stay in IDLE state.
Layer 1 Supervision is enabled by setting it to 1:"On"
When Layer 1 is deactivated or goes down due to a fault, immediately an alarm #10 shall be raised.
The trunk ports associated with this ISDN circuit shall then be skipped in trunk selection, therefore selecting
the next available trunk.
When Layer 1 is activated, a #10 recover message shall immediately be issued. The associated ports
(trunk/station) shall then go to state IDLE.
System Maintenance Manual
Issue 1.0
87