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Chapter 4 Tutorial
4.5
Remote Loopback Test
1.
When you have completed the Local Loopback test for both units, proceed to
the next step. Connect the local and remote TC8612 units as shown on the
diagram below.
2.
Connect the T1/E1 connections as shown on the diagram below. Be sure to
make the correct pin connections, refer to page 2-6 for pin assignments.
3.
Verify that both TC8612 units have the same Line Code and Line Length
settings and that the local unit is set to internal timing mode with dip switch
SW3 to the Down (On) position.
4.
On the local TC8612, slide dip switch SW2 (Remote Loopback) to the Down
(On) position. Observe that the "ALM" alarm LED will flash indicating that
the unit is in diagnostic (remote loopback) mode. The "PWR A and/or PWR B"
and "VCC" LEDs will be solidly lit. The "SYNC" LED will be solidly lit and
both "DET" and "RLY" LEDs will blink indicating the dry contact signal from
the user's device is received and looped back through out the link as shown on
the diagram below. The "LOS" LED will be Off.
5.
On the remote TC8612, observe that the "ALM" alarm LED will flash
indicating that the unit is in diagnostic (remote loopback) mode. The "PWR A
and/or PWR B," "VCC," and "SYNC" LEDs will be solidly lit. Only the
"RLY" LED will blink, the "DET" and "LOS" LEDs will be Off.
6.
Check that the volt meter is indicating connection integrity.
7.
If any other LEDs illuminate or flash on the units, make sure that all DIP
switches on both of the TC8612's are in the correct position.
8.
At this point, both units tested will have passed all electrical tests and will have
been verified that they are functioning properly. When done, return SW2 and
SW3 on the local unit to the Off (Up) position.
TC8612 Rev 1.1
User Manual
Remote Loopback Test
4-4
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