Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Table 8-3. Indicator status during drop/insert multiplexer loopback (Module B)
Module LED Indicator Patch Cord
Loopback
(1)
EqLB
Loopback
Both CM4 RX ON
(2)
modules ERR and BPV OFF OFF
(A and B) FRM OFF OFF
INT ON ON
LPBK OFF ON
Power supply NORMAL ON OFF
ALERT OFF ON
ALARM OFF OFF
1. Electrical or fiber optic.
2. RX IN on CM4 Module A should be on. However, when a patch cord is used to
create the loopback, the state of RX IN on CM4 Module B will depend on the
signal coming from Location 3, which has not yet been tested.
8.3.3 TERMINAL MULTIPLEXER AT LOCATION 3 (LOOP-TIMED)
Use this procedure to check out the loop-timed terminal multiplexer at Location 3. The major
difference between this procedure, and that used to check-out the terminal multiplexer at Location 1, is
that CM4 timing has to be temporarily changed from Loop to Internal while local loopback tests are
performed. Transmitter timing must then be returned to Loop before the terminal multiplexer at
Location 3 is put on-line.
1. Verify that the CM4 module is in the terminal mode as follows:
a. Remove the CM4 module for a few seconds and then re-insert it.
b. Look at the display on the CM4 module.
The display should read "TERM" if the module is in the terminal mode. If
it does, go to step 2.
If the display reads anything else, check the settings of jumpers J1 and J2
on the MA-270R Module Adapter at the rear of the shelf. If the multiplexer
uses a fiber optic interface, check the setting of DIP switch SW1 on the OIA
at the rear of the shelf. (See Section 5 for more information on jumper and
switch settings.)
IMUX 2000E1 RFL Electronics Inc.
January 23, 2004 8-19 (973) 334-3100
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