Troubleshooting guide

MX2820 System Manual
7-168 61186003L1-1D
15. From the T1/E1 Provisioning menu, select VT HAIRPIN LOOPBACK.
Hairpin back the VT to the STS-1 signal for dropping farther down the SONET ring. The
VT Hairpin Loopback options are as follows:
• 1 - Disabled
•2 - Enabled
16. From the T1/E1 Provisioning menu, select CROSS-CONNECT MAPPING.
Any VT can be cross-connect mapped to any available T1/E1 port. Selecting UNEQUIPPED
(option
29) will free the port and disable the VT. The default mapping is VT Group
Mapping.
The last option on this menu allows the setting of multiple VT cross connects. The default
mapping is GV Group Mapping. Sequential (1-to-1) mapping can be selected from this
screen.
17. From the T1/E1 Provisioning menu, select VT AIS TRANSMISSION.
When enabled, the VT AIS is transmitted toward the STS-1 during DS1/E1 LOS and LAIS
conditions (per GR-253). The default is
ENABLED.
When disabled, VT AIS is never transmitted.
18. Press ESC as required to return to the MX2820 Main Menu.
FOLLOW-UP PROCEDURES
Once this procedure is complete, return to the procedure which called out this DLP and
continue with the tasks indicated.