Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
7. With CM4 Module A looped, perform all desired loopback tests on transmit/receive channel
modules configured to transmit in the A direction - that is, all channel modules that terminate
circuits from Location 1.
These tests may include loss measurements on voice and program channels, bit
error tests on data channels, and so on.
8. When channel tests are complete, take down the loopback on CM4 Module A by removing the
patch cord between its E1 EQUIP OUT and E1 EQUIP IN jacks.
If loopback was initiated by activating the module's Equipment Loopback (EqLB),
de-activate it.
9. Remove the patch cord or termination plug that was plugged into the E1 EQUIP IN jack on
CM4 Module B.
10. Use one of the following methods to establish a local E1 loopback at CM4 Module B:
a. Use a Bantam-Bantam patch cord to connect the E1 EQUIP OUT jack to the E1 EQUIP
IN jack.
b. If the multiplexer has an electrical E1 interface, connect an external looping plug to the
15-pin D-subminiature E1 connector (DA-15) on the MA-270R Module Adapter.
c. If the multiplexer has a fiber optic interface, connect a fiber optic patch cord between
the fiber optic connectors on the Optical Interface Adapter (OIA).
d. Use the Group switch to display the LPBK group and then the SET/NEXT switch to set
(activate) the EqLB (equipment loopback).
At this point, CM4 Module B (and CM4 Module A) should be timed by the signal
coming from the terminal multiplexer at Location 1. Because of this, the fallback
timing "trick" is not needed to test CM4 Module B.
11. Once CM4 Module B is looped, verify the states of the indicators as shown in Table 8-3.
12. With CM4 Module B looped, perform all desired loopback tests on the transmit/receive channel
modules that are configured to transmit in the "B" direction - that is, all channel modules that
will be terminating circuits from Location 3.
As before, these tests may include loss measurements on voice and program channels, bit
error tests on data channels, and so on.
13. At this point you may also perform end-to-end tests on channels established between Locations
1 and 2; that is, through the channel modules at Location 2 that are configured to transmit in the
"A" direction.
IMUX 2000E1 RFL Electronics Inc.
January 23, 2004 8-18 (973) 334-3100
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