Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
4. Put one end of a E1 patch cord (or a 100-ohm termination plug) into the E1 EQUIP IN jack on
CM4 Module B.
This establishes a "no signal" condition at the input to CM4 Module B. CM4
Module A is automatically forced into its fallback timing mode (Internal).
5. Use one of the following methods to establish a local E1 loopback at CM4 Module A:
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).
6. Once the loopback is established, verify the states of the following indicators on CM4 Module
A, as shown in Table 8-2.
Table 8-2. Indicator status during drop/insert multiplexer loopback (Module A)
Module LED Indicator Patch Cord
Loopback
(1)
EqLB
Loopback
CM4 RX ON ON
ERR and BPV OFF OFF
FRM OFF OFF
LOOP (2) (2)
LPBK OFF ON
Power supply NORMAL OFF OFF
ALERT ON ON
ALARM OFF OFF
1. Electrical or fiber optic.
2. In a drop/insert multiplexer, the LOOP indicator actually indicates THRU
timing. It blinks to show that although this is the primary timing
setting, the multiplexer is now using fallback (INT) timing.
IMUX 2000E1 RFL Electronics Inc.
January 23, 2004 8-17 (973) 334-3100
To Next Page
Loading...
