3Com 3C63400-3AC-C - PathBuilder S700 Switch, Reference Manual

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224 C
HAPTER
6: P
ATH
B
UILDER
S700 D
IAGNOSTICS AND
P
ERFORMANCE
M
ONITORING
DSX-1 CBR Module
Loopbacks
The DSX-1 CBR module supports the following loopbacks:
Local Card —Loops the transmit DSX-1 output on the receive side. All cells coming
from the DSX-1 CBR port card are looped through the backplane and back to the
DSX-1 CBR port card. The transmitted data will continue to go on the output
towards the trunk card.
Network Line —Loops the DSX-1 received data back on the output side after the
digital data has been recovered.
Network Card —Loops the DSX-1 received payload back toward the line output.
Figure 171 illustrates the DSX-1 CBR loopback options.
Figure 171 DSX-1 CBR Loopback Options
FAM Loopbacks The FAM module supports the following loopbacks:
Local Card —Loops the transmit FAM output on the receive side. All cells coming
from the FAM port card are looped through the backplane and back to the FAM
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.
Network Line
Line Side ATM Side
(Trunk)
CBR DSX Interface
Network Card
Local Card