ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
86
Confidential and Proprietary Information of ZTE CORPORATION
Summary of Alarms
BTS alarm information refers to the prompt information that appears when
the BTS has problem or fault during operation. Usually, the alarms last
some time and will not disappear until all the problems or faults have been
removed.
According to the severity, the alarms are divided into levels 1, 2, 3 and 4
to indicate critical, severe, major and minor alarms, as shown in Table 15.
The alarm levels can be modified as required in the operation and
maintenance system (OMS).
T
A B L E
1 5
D
I V I D I N G
A
L A R M
L
E V E L S
Alarm
Level
Range of
Severely
Affected
Service
Range of Severely
Affected
Equipment Safety
Range of
Severely Affected
System
Reliability
Range of
Severely
Affected System
Maintainability
1
Whole BSS
Whole BSS
2
One or some
sites
BSC or a site
Whole BSS
Whole BSS
3
One or some
carrier
frequencies
One or some carrier
frequencies
BSC or a site
BSC or a site
4
One or some
channels
No effect
One or some carrier
frequencies
One or some
carrier frequencies
Note: In the alarm level definitions, the affected range only refers to the effect on a single
index. That is to say, when the effect on an index, such as reliability and safety, reaches a
certain scope, the alarm level can be basically determined. If an alarm affects several
indexes, it should consider upgrading the alarm level.
Alarm handling varies with the alarm levels.
1.
When level-1 or level-2 alarms appear, contact the local ZTE office
immediately and handle the problems under the guide of the ZTE
engineers.
2.
When level-3 or level-4 alarms appear, the maintenance staff in the
equipment room should write down the problem and fault description,
and follow the related descriptions in this manual to handle the alarms.
If it does not work, contact the local ZTE office immediately.
In BS21 (V2.2), the CMM is the administrator of the entire BTS, gathering
all BTS’s alarms and reporting them to the BSC, and displaying them on
local MMIs. The alarm sources in BS21 (V2.2) are CMM, TPU, RCU, PAU,
AEM and the environmental supervision unit. Of them, the alarms of the
RCU, PAU and AEM are collected by the TPU while the alarms of the
environmental supervision unit are collected by the CMM. This manual
does not describe the alarms of the environmental supervision unit. As a
result, only the active/standby CMM board related alarms are listed in the
