180
C
HAPTER
5: P
ATH
B
UILDER
S330 D
IAGNOSTICS
AND
P
ERFORMANCE
S
TATISTICS
Figure 153 illustrates the loopbacks for T1/E1.
Figure 153
T1/E1 Loopbacks
OC3/STM-1 Loopbacks
The following loopbacks are available for the OC3/STM-1 interface:
Network LIne
— Loops the OC3/STM-1 received data back on the output side
after the digital data has been recovered.
Local Card
— Loops the transmit OC3/STM-1 output on the receive side; the
transmitted data will continue to go on the output.
Figure 154 illustrates the loopbacks for OC3/STM-1.
Figure 154
OC3/STM-1 Loopbacks
Network Card
Local
Payload
Line
Network Side
T1/E1 Interface
Local Card
Payload
Network Line
Network Side
OC3 Interface