performs a local logical loopback and does not require any external loopback of the T-1
signal.
Restrictions and limitations
Disable the DCHI and DTI/PRI before performing the self-test on the entire DTI/PRI card.
Individual channels must be disabled before performing a self-test on a particular channel.
Self-testing the DTI/PRI card
T
o perform a self-test on the entire DTI/PRI card:
1. Enter the following command in LD 96 to disable the DCHI:
DIS DCH N
2. Enter the following command in LD 60 to disable the DTI/PRI card and run the self-
test:
DISL C
SLFT C (entire card)
3. To self-test individual channels, follow the same procedure as above, but use the
following commands:
DSCH C CH
SLFT C CH (specific channel)
DTI/PRI automatic local loopback test
There are two types of automatic local loopback tests:
•
ATLP 0 (disable auto loopback test in daily routine: LD 60)
• ATLP 1 (enable auto loopback test in daily routine: LD 60)
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 performed sends
out a Yellow alarm while the link is down.
Ensure that LD 73 TRSH RALM is not exceeded at the far end due to the automatic loop test.
If TRSH RALM (default = 3) is exceeded at the far end, trunks remain out of service.
DTI/PRI maintenance tools
ISDN Primary Rate Interface Maintenance November 2011 109
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