Nortel Meridian 1 Option 11C Manual page 60

Page 60 of 100 DTI/PRI Maintenance
553-3011-310 Standard 13.00
The automatic loop test checks the same functions as the manual self test, but
runs automatically as part of the midnight routines.
ATLP 0 disables one idle channel at random and performs a single channel
self test. This channel cannot be specified — it is selected by software.
ATLP 1 attempts to test the whole DTI/PRI loop. If ATLP 1 finds all channels
in the target link idle, it takes the whole link down and tests it. The node where
the self test is being performed sends out a Yellow Alarm while the link is
down.
Ensure that LD 73 TRSH RALM will not be exceeded at the far end due to
automatic running of the loop test. If TRSH RALM (default=3) is exceeded
at the far end, trunks will remain out of service.
ATLP 0
ATLP 1
Remote Loopback and remote self test
The remote loopback and the remote self test are performed manually per
loop (or per card in Option 11C).
Remote Loopback
The RLBK C command puts the DTI/PRI into loopback towards the far end
so a remote self test can be performed on equipment at the far end.
Note: The DTI/PRI loop (card) being tested must be disabled.
Remote loopback test
The remote self test, also called the external loopback test, checks the
integrity of the DTI/PRI through an external T-1 loopback. If the Remote
Loopback command (RLBK) is executed at the far end Meridian 1/SL-1 prior
to executing the Remote Self test command (RMST) at the near end, the
integrity of the DS-1 facility is tested from end to end.
Note: The DTI/PRI channel or loop (card) being tested must be
disabled.
January 2002
AUTO SELF TEST LOOP DISABLE
AUTO SELF TEST LOOP ENABLE