Troubleshooting guide

Section 5, User Interface Guide - UIG-530, M13 Loopbacks
61186003L1-1D 5-91
DS2 LOOPBACKS
Performing a loopback test for the DS2 network requires selecting an option from 30 to 36
from the Loopbacks menu screen. Figure 5-58 shows an example for the DS2 #1 Loopbacks
menu. Select option 1,
DATA MODE, for the appropriate DS2 to end a test in progress.
Figure 5-58. DS2 Loopbacks Menu (DS2 #1) Example
DS2 Network
A DS2 Network loopback test loops the selected DS2 signal back to the DS3 network prior to
being passed through the M12/G.747 demultiplexer. All T1/E1 lines attached to the DS2
network receive data normally, but all data inserted into the T1/E1 lines attached to the
selected DS2 signal are ignored and replaced by the incoming DS2 network data. Figure 5-59
provides an illustration for this test.
Figure 5-59. DS2 Network Loopback Test
Shelf: 1 Slot: 4A ADTRAN MX2820 System 04/13/04 16:49
Unacknowledged Alarms: None TID: HTVLALEXD16
DS2 Loopbacks
DS2 #1: Data Mode
1 - Data Mode
2 - Network Loopback
Selection: '?' - System Help Screen