Signaling Link Fault; Oml Signaling Link Fault - Huawei Airbridge CBTS3612-800 User Manual

User Manual
Airbridge cBTS3612-450 12-carrier CDMA Base Station

5.1 OML Signaling Link Fault

5.1.1 Description of Fault
After a base station is powered on, such faults occurred, for example, failed BOOTP,
failed establishment of the OML with OMC or OML broken link alarm during the
normal operation of a base station. In this case, you may observe at the near-end and
OMC far end maintenance consoles of a base station that the "OML Signaling Link
Fault" alarm occurs.
5.1.2 Fault Analysis and Location
The OML connection of a base station begins with the BCKM of the base station,
passes BCIM of the base station, the XIE and MUX of BSC, LPU and MPU of the
switching frame, and ends with the background (BAM). Therefore, any chain fault in
this route may lead to an OML fault in the base station.
I. Communication link fault between the BCKM board and BCIM board
For details, please refer to the board communication link fault in "6.2 Processing of
Common Board Faults".
II. Abnormal IMA group or UNI link status
If the physical layer of an OML is connected by means of E1, it can be configured as
IMA mode or UNI mode as required. If there is incorrect IMA group status or UNI link
status, OML fault may occur.
At the far end OMC client or near-end maintenance console, you may query the
special status of a board to obtain the IMA group status or UNI link status.
If there is abnormal IMA group status or UNI link status, please check point by point:
Whether E1 link is normal. This can be done by means of loopback test.
l
In the case of IMA, it is necessary to make sure whether the N pair of E1s in the
l
BSC IMA group corresponds to that in the base station IMA group (N=1~8).
Check whether the IMA group configuration of BSC and that of the base station
l
are consistent.
III. VCI configuration error of CMUX board of BSC
The prerequisite for an OML to be established in a base station is that there should
be a successful BOOTP request, which demands a unique MAC address field. If
there are repeated data when BSC configures MUX with VCI information, the MAC
field in the BOOTP request packet may be made not unique. Thus, the base station
BOOTP fails and the OML cannot be established.
Processing method: check the configuration data of BSC to ensure the correctness
and uniqueness of the configuration data.
03Q-0112-20020720-120

5 Signaling Link Fault

5 Signaling Link Fault
5-1