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Chapter 3 Configuring the OC-3 Mode Ports and Channels Using the Console
Loopback Option
3-4
255-700-714R11.0
PacketStar
®
PSAX 1-Port Channelized OC-3/STM-1 CES Module User Guide
, Issue 1
Release 11.0.0
Loopback Option
To aid network troubleshooting and testing, loopback capability is provided
for the 1-Port Channelized OC-3/STM-1 CES modules. The loopback option
on the module’s port and channel configuration window for the module
enables you to verify the integrity of a port by transmitting a received signal
back to the source. Selecting a loopback option is described in the module
configuration procedures.
Figure 3-4 illustrates the line loop and local loop options.
Figure 3-3. Fiber Optic Links Between Working and Protection Modules on a PSAX 1250
and a PSAX 2300 Chassis
ACTIVE
OC-3c
MM
APS
FAIL
LOS
TX
RX
ACTIVE
OC-3c
MM
APS
FAIL
LOS
TX
RX
ACTIVE
OC-3c
MM
APS
FAIL
LOS
TX
RX
ACTIVE
SOC-3c
MM
APS
FAIL
LOS
TX
RX
ACTIVE
STM-1
MM
MSP
FAIL
LOS
TX
RX
ACTIVE
STM-1
MM
MSP
FAIL
LOS
TX
RX
PSAX 2300
ACTIVE
SOC-3c
MM
APS
FAIL
LOS
TX
RX
ACTIVE
OC-3c
MM
APS
FAIL
LOS
TX
RX
ACTIVE
OC-3c
MM
APS
FAIL
LOS
TX
RX
ACTIVE
OC-3c
MM
APS
FAIL
LOS
TX
RX
ACTIVE
OC-3c
MM
APS
FAIL
LOS
TX
RX
ACTIVE
STM-1
MM
MSP
FAIL
LOS
TX
RX
ACTIVE
STM-1
MM
MSP
FAIL
LOS
TX
RX
Working Module (Active)
Protection Module (Redundant)
Note: All connections between chassis are fiber optic links
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