User's Manual Part 3

RBS 2308 and RBS 2309 User’s Guide

If the yellow Local indicator is flashing and the anticipated BSC communication

cannot be established, then perform the following actions step-by-step (in close

cooperation with the BSC operator) until the fault ceases:

•ResettheIXU

• Ensure that the expected Transmission OK indicators are on

Note: Transmission OK indicators only indicate that the incoming

transmission signal is present electrically. The physical

transmission connection should still be checked.

• Ensure that the TEI value in the RBS IDB corresponds with the CF TEI value

set in the BSC for this RBS. Request that the BSC operator checks that no

other RBSs are using the s ame CF TEI value on the transmission line

• If a PSTU is used, ensure that the PSTU is in operation (otherwise, follow

the instructions in the PSTU Alarm OPI, Ethernet Interface Down) and that

the transmission interface parameter in the RBS IDB is set to IP

• If a PSTU is not used, ensure that the following transmission parameters

in the RBS IDB are correct:

− Transmission interface

− CRC-4

− Spare bits

− Synchronization source

− Receiver sensitivity

− LBO

• Ensure that all RBSs, connected on the same transmission line between the

BSC and this RBS, have Cascade defined as Network Topology in the IDB

• Ensure that the BSC has a correctly configured A-bis path to the RBS

• Ensure that the c orresponding TRH and RBLT devices in the BSC are

working

RBS Fault

If the yellow RBS Fault indicator is on, an RBS fault is detected. Perform the

following actions step-by-step until the fault ceases:

• Use the OMT to display fault information, see Section 10.3 Fault

Localization Using OMT on page 176

/LZT 720 0027 Uen R8A 2006-06-27