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TESTS
DS1 Remote Test
4-12
DS1 Remote Test (RT) activates the remote CSU's DS1 Line Loopback
function (illustrated in Figure 4-10) or DS1 Test Loopback function
(Figure 4-11), depending on which one is enabled in the remote CSU. This
tests both CSUs and the T1 link by transmitting a locally-generated test
message through the local CSU to the remote CSU and looping it back to
the test equipment for verification. Bipolar violations are uncorrected
during this test when the remote CSU has its LLB function enabled.
Whether the local CSU transmits framed or unframed loopback codes de-
pends on the selection of the loopback test code framing option.
This test can be controlled locally via front panel switch RT or the Super-
visory terminal Remote Test. To perform this test, refer to Table 4-6.
Initiating DS1 Remote Test causes the local CSU to send
the loopback code the remote CSU, and to reflect the lo-
cal CSU's test status via its front panel and status line
indicators. These indicators do not imply that the re-
mote CSU is in loopback, as the remote CSU does not
acknowledge receipt of loopback codes nor does it in-
form the local CSU of its test status. Inband Loopback
Code Detection must be enabled in the remote CSU.
TABLE 4-6. DS1 REMOTE TEST
Step
Front Panel Control
1.
To prevent data loss, suspend operation of all associated digital-terminating
equipment.
2.
Connect the test equipment to the local CSU's test jacks, as shown.
3.
Engage the local CSU's RT switch.
The TM indicator should be lit during
the test.
4.
Wait 5 seconds after starting the test, then generate a test message. The test
equipment should receive the same message it transmitted; if not, a problem
exists.
5.
To stop the test, disengage the RT
switch.
NOTE
Supervisory Terminal Control
Initiate Remote Test at the local CSU
(on the LOOPBACKS screen). Loop
Status should be ON during the test.
To stop the test, terminate Remote
Test.
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