The three Fallback modes are:
• Re-timed AIS: A Re-timed AIS is sent out.
• Self-timed:The signal is sent out, from the port in the Self-timed mode.
• None: No Fallback applies.
Force DNU
Force DNU allows to force an S1 byte value: DNU into an outgoing signal. The Force
DNU option can be switched on by selecting Force. It can be switched off by selecting
Do Not Force.
Important! When an outgoing signal is forced to carry DNU, this signal cannot be
used for synchronization by another network element.
Outgoing QL
Outgoing QL indicates the quality level that is sent out on a given transmission output
port which supports S1-byte quality level information carriage.
SSM out
SSM Out displays the quality level corresponding to the current S1-byte value that is
sent out from the selected port.
Timing mode
The timing mode of each individual 1.5 Mbit/s, 2 Mbit/s, and X.21 tributary output
port can be set to the Self-Timed or Re-Timed mode:
• In the Self-Timed mode the 2 Mbit/s signal is extracted from the container contents
of the VC-12.
• In the Re-Timedmode, the timing of the 2 Mbit/s output signal is derived from the
network element system timing; the 2 Mbit/s signal is routed through the elastic
buffer.
If the ISDN mode of a 2 Mbit/s ISDN port is set to Leased Line (LL), the default value
of the Timing Mode parameter will be Re-Timed.
For more information see the section ″Timing Concepts″.
Timing alarm reporting
When the Timing State of a 1.5 Mbit/s, 2 Mbit/s, or X.21 tributary output port is
Fallback, a defect is declared. The reporting of this Timing Alarm can be Enabled or
Disabled for each individual 2 Mbit/s tributary output port. This is done with the
Timing Alarm Reporting parameter.
Timing provisioning
Parameters for provisioning output port timing
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7-48
Alcatel-Lucent - Proprietary
See notice on first page
365-312-807R7.2
Issue 4, May 2007
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