3Com 3C63100-AC-C - PathBuilder S600..., Reference Manual

Page: 198 / 232

198 C
HAPTER
6: P
ATH
B
UILDER
S600 D
IAGNOSTICS AND
P
ERFORMANCE
M
ONITORING
OC3/STM-1 Loopbacks The OC3/STM-1 module supports the following loopbacks:
Local Card —Loops the transmit OC3/STM-1 output on the receive side. All cells
coming from the OC3/STM-1 port card are looped through the backplane and
back to the OC3/STM-1 port card. The transmitted data will continue to go on the
output.
Network Line —Loops the OC3/STM-1 received data back on the output side
after the digital data has been recovered.
Figure 152 illustrates the loopbacks for OC3.
Figure 152 OC3/STM-1 Loopback Options
CBR DSX Module
Loopbacks
The CBR DSX module supports the following loopbacks:
Local Card —Loops the transmit CBR DSX output on the receive side. All cells
coming from the CBR DSX port card are looped through the backplane and back
to the CBR DSX port card. The transmitted data will continue to go on the output
towards the trunk card.
Network Line —Loops the DS1 received data back on the output side after the
digital data has been recovered.
Network Card —Loops the DS1 received payload back toward the line output.
Local Card
Payload
Network Line
Network Side
OC3 Interface