Table of Contents
Advertisement
TESTS
DS1 Local Test
EQUIPMENT
4-8
DS1 Local Test (LT), illustrated in Figure 4-6, loops a
test message through the CSU and back to the test equipment for verifica-
tion. As much as is practical of the CSU's circuitry is utilized in this test.
During this test, data is also transmitted to the T1 link, with pulse den-
sity constraints, but data is not received from the line.
This test can be controlled via front panel switch LT or the Supervisory
terminal Local Test. To perform this test, refer to Table 4-2.
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 LT switch.
The TM indicator should be lit during
the test.
4.
Generate a test message. The test equipment should receive the same mes-
sage it transmitted; if not, a problem exists.
5.
To stop the test, disengage the LT
switch.
CSU OUT
CSU IN
LOCAL CSU
IN
OUT
TEST
EQUIPMENT
FIGURE 4-6. DS1 LOCAL TEST
TABLE 4-2. DS1 LOCAL TEST
T1
NETWORK
locally-generated
Supervisory Terminal Control
Initiate Local Test at the local CSU (on
the LOOPBACKS screen). Loop Status
should be ON during the test.
To stop the test, terminate Local Test.
REMOTE CSU
EQUIPMENT
Advertisement
Table of Contents
