180 CHAPTER 5: PATHBUILDER S330 DIAGNOSTICS AND PERFORMANCE STATISTICS
Figure 137 OC3/STM-1 Loopback Menu
4 Select [1] Set Loopback. A prompt listing the loopback choices for the selected
port appears at the bottom of the screen.
5 Enter the number corresponding to the type of loopback you want to configure.
The following subsections describe the available loopbacks for each of the
PathBuilder S330 interfaces.
T1/E1 UNI Loopbacks The following loopbacks are available for the T1/E1 UNI interface:
Network Line—Loops the T1/E1 received data back on the output side after the
digital data has been recovered.
Local Card—Loops the transmit T1/E1 output on the receive side; the transmitted
data will continue to go on the output.
Network Card—Loops the T1/E1 received payload back toward the line output.
illustrates the loopbacks for T1/E1.
Figure 138 T1/E1 Loopbacks
Network Card
Local
Payload
Line
Network Side
T1/E1 Interface
