Ds3 Loopbacks; E3 Loopbacks - 3Com SuperStack II PathBuilder S330 Reference Manual

DS3 Loopbacks

The DS3 module supports the following loopbacks:
Local Card — Loops the transmit DS3output on the receive side. All cells coming
from the DS3 card are looped through the backplane and back to the DS3 card.
The transmitted data will continue to go on the output.
Network Line — Loops the DS3 received data back on the output side after the
digital data has been recovered.
Network Card — Loops the DS3 received cell payload back toward the line
output.
Figure 155 illustrates the DS3 loopback options.
Figure 155 DS3 UNI Loopback Options
Network Side

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 156 illustrates the loopbacks for the E3 module.
DS3 Interface
Network Card
Network
Line
Using Loopbacks
Bus Side
Local Card
181