182 CHAPTER 5: PATHBUILDER S330 DIAGNOSTICS AND PERFORMANCE STATISTICS
E3 Loopbacks The E3 module supports the following loopbacks:
Local Card—Loops the transmit E3output on the receive side. All cells coming
from the E3 port card are looped through the backplane and back to the E3 port
card. The transmitted data will continue to go on the output.
Network Line—Loops the E3 received data back on the output side after the
digital data has been recovered.
Network Card—Loops the E3 received cell payload back toward the line output.
Figure 141 illustrates the loopbacks for the E3 module.
Figure 141 E3 Loopback Options
CBR Loopbacks The following loopbacks are available for the CBR module:
Network Line—Loops the T1-DSX received data back on the output side after the
digital data has been recovered.
Local Card—Loops the transmit T1-DSX output on the receive side; the
transmitted data will continue to go on the output.
Network Card—Loops the T1-DSX received payload back toward the line output.
Figure 142 illustrates the CBR T1-DSX loopbacks.
Figure 142 CBR Loopback
Network Card
Local
Payload
Line
Network Side
E3 Interface
Network Card
Local
Payload
Line
Network Side
CBR Interface
