Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
4. To further identify the cause of the fault in the multiplexer at Location 2, deactivate the Line
Loopback and activate the Payload Loopback in the Location 2 CM4 D/I-A M-DACS
multiplexer.
If the FRM indicator remains on at Location 1, then the source of the fault is the
CM4 module in the Location 2 multiplexer.
Replace CM4.
If the FRM indicator turns off, then the fault may be related to the ones density of
the signal generated by the multiplexer at Location 2. This can mean either that
too many data channels are operating without bandwidth limitation (i.e. operating
at N x 64 Kbps rates instead of N x 56 Kbps rates), or that the system is set up to
use the AMI line code but should be set up for B8ZS.
5. You can also perform these tests in the opposite direction, from Location 2 towards
Location 1, as shown in Figure 8-2b.
8.2.6 USING T1 TEST EQUIPMENT TO PERFORM IN-SERVICE TESTS
When intermittent errors occur on one or more data channels, it is often helpful to perform in-service
monitoring on the T1 facility. This is primarily useful in determining whether the channel errors are
being caused by errors on the T1 facility, rather than by a fault in the channel module or in another
section of the low-speed circuit.
Use the following procedure to perform in-service monitoring of a T1 facility between two IMUX
2000 locations (Figure 8-3).
1. To measure performance in the Location 2 to Location 1 direction, connect the DS1/T1 input of
a T1 test set (such as a TTC T-BERD 211A or a Tau-tron 5111) to the T1 IN Mon jack on the
multiplexer at Location 1.
2. To measure performance in the Location 1 to Location 2 direction, connect the DS1/T1 input of
a T1 test set to the T1 IN Mon jack on the multiplexer at Location 2.
M-DACS-T1 RFL Electronics Inc.
October 25, 2004 8-6 (973) 334-3100
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