Troubleshooting guide

61186003L1-1D 5-95
UIG-535
STS-1 Loopbacks
INTRODUCTION
This subsection provides the instructions for accessing the MX2820 STS-1 MUX Loopbacks
menu screen and performing loopback tests and Bit Error Rate Tests (BERT).
The STS-1 MUX Loopback menu allows initiation of loopback tests from the MX2820 system.
From the STS-1 Loopback Menu screen, STS-1 and VT/Port loopback tests can be accessed.
Figure 5-63 shows the main Loopback Menu screen.
Figure 5-63. MX2820 STS-1 MUX Loopbacks Menu
From this menu, press the number for the desired VT/Port, or press 29 to test at the STS-1
level. When
ENTER is pressed, a second menu displays the types of tests available.
Shelf: 1 Slot: 4A ADTRAN MX2820 System 04/15/04 12:55
Unacknowledged Alarms: NONE TID: HTVLALEXD16
MX2820 Loopbacks
VT / Port Loopbacks VT / Port Loopbacks STS-1 Loopbacks
1 - (1 ) Data Mode 15 - (3 ) Data Mode 29 - STS-1 = Data Mode
2 - (5 ) Data Mode 16 - (7 ) Data Mode
3 - (9 ) Data Mode 17 - (11) Data Mode
4 - (13) Data Mode 18 - (15) Data Mode
5 - (17) Data Mode 19 - (19) Data Mode
6 - (21) Data Mode 20 - (23) Data Mode
7 - (25) Data Mode 21 - (27) Data Mode
8 - (2 ) Data Mode 22 - (4 ) Data Mode
9 - (6 ) Data Mode 23 - (8 ) Data Mode 30 - Reset ALL tests
10 - (10) Data Mode 24 - (12) Data Mode
11 - (14) Data Mode 25 - (16) Data Mode
12 - (18) Data Mode 26 - (20) Data Mode
13 - (22) Data Mode 27 - (24) Data Mode
14 - (26) Data Mode 28 - (28) Data Mode
Selection: '?' - System Help Screen