9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. VI-B-37
the AIS signal, or upstream of that equipment. In this user-enabled instance, AIS
can be used to test traffic or alarm continuity on uncommissioned (non-traffic
carrying) tribs, or to send a signal downstream to indicate traffic has been
interrupted (for example, a service check is being performed).
For E1, DS1, E3, DS3 tribs, AIS is generated as an unframed, all-ones signal.
For an STM1/OC3 trib, AIS selection inserts a PRBS15 pattern (15 bit
pseudo-random bit sequence).
The AIS enabled alarm is activated on a per trib basis.
Trib n Radio Facing Loopback
Trib data looped back to radio path. This is a warning alarm.
Probable Cause
A radio facing (TDM bus facing) loopback has been established on a trib using
commands in the CT System Controls screen.
Recommended Actions
To remove the alarm, deselect the loopback.
Additional Information
When a radio-facing loopback is placed on an E1/DS1 trib, AIS is inserted on the
line/customer facing direction of that trib.
Trib n Line Facing Loopback
Trib data looped back to line. This is a warning alarm.
Probable Cause
A line-facing loopback has been established on a trib using commands in the CT
System Controls screen.
Recommended Actions
To remove the alarm, deselect the loopback.
Additional Information
When a line-facing loopback is placed on a trib, the trib-in data is also allowed to
pass through to the TDM bus / radio.
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