20
To test the local connection, do the following:
1. Set S2-1 to the OFF position.
2. Locate the port label (P1-P4) above or below the front panel
switches, Activate local loopback for a network port by moving the
appropriate front panel toggle switch UP or DOWN. A yellow TM
LED corresponding to the port under test will turn on.
3. A BER (Bit Error Rate) test can be performed using a BER tester at the
far end of the T1/E1 link. If the BER test equipment indicates no faults
but the data indicates a fault, follow the manufacturer's checkout proce-
dures for the far end device. The BER test can also be performed using
a built-in 511/511E pattern generator. (See the following section for
more on how to use the built-in 511/511E pattern generator.)
4. Upon completion of the LAL test, return the front panel switch to center
position. After approximately 30 seconds, the TM LED should turn off.
7.2 REMOTE LOOPBACK TEST
The Remote loopback feature tests the performance of the local and remote
1194 and the fiber optic link. During this test, data transmitted from a T1 or
E1 port at a local 1194 and sent over the fiber link is returned by the remote
1194. For example, to initiate a remote loop test on network port 1, move the
first switch from the left UP towards label “P1”, data sent from port 1 will go
through the 1194 and fiber link to the remote 1194 (see Figure 12). The
remote 1194 will send port 1 data back to the originating device, as well as
to the corresponding port on it’s E1/T1 network side.
In order to prepare the Model 1194, make sure that fiber connection is in
place. Verify that the “Fiber link” LED on the front panel of the 1194 is ON.
Figure 12.
1194 Remote Loop
E1/T1
Fiber
CSU/DSUs
4
3
2
1
4
3
2
1
1194
1194
E1/T1
CSU/DSUs
