A C C E S S O R I E S
49
Interface loopbacks
The interface loop is set in the traffic interface module, - for MUX and REBM IDUs in the E1 and
V.35 interfaces, for E1 IDUs – in the E1 transceiver chip.
The interface loopbacks are available for V.35 and E1 interfaces only, the loop test can not be set
in the Ethernet interface.
Figure 16. The interface loopbacks for the CFM-16-8E1 and the CFM-34-16E1 IDUs
CPU
E1
G.703
HDB3
OUT
IN
Mul
tiplexer
Remote
loop
Local
loop
Analog
Interface
I C
2
bus
Figure 17. The E1 interface module digital loopback (for the modular IDUs equipped with the E1
interface module); the analog and remote interface loopbacks are similar to those for the CFM-16-8E1
and CFM-34-16E1 IDUs
CPU
OUT
IN
I C
2
Remote
loop
Local
loop
V.35
Interface
RxD
DSR
RxC
SCTE
TxD
DTR
RTS
bus
Multiplexer
Figure 18. The V.35 interface module loopback (for the modular IDUs equipped with the E1 interface
module)
Analog
Interface
Analog
Interface
Analog
Interface
Local digital loopback
Analog loopback
Remote digital loopback
E1
G.703
E1
G.703
E1
G.703
Summary of Contents for CFM-13-LM
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