Chapter 6 - Troubleshooting
Confidential and Proprietary Information of ZTE CORPORATION 159
5.
The fault locating flow is as shown in Figure 81.
F
I G U R E
8 1
F
A U L T
L
O C A T I N G
F
L O W
C
H A R T O F
U
N I D I R E C T I O N A L
M
O B I L E
P
H O N E
C
A L L S
Start
YES
YES
End
Whether the fault
occurs in the
entire MSC
Whether wireless
parameters are set
correctly
Whether single
pass occurs at a
fixed timeslot
Replace the AEM
module
Adjust the wireless
parameters
Whether the fault
occurs in the
entire BSC
NO
NO
NO
YES
NO
YES
Confirm the
fault occurs at
a BS
YES
NO
Confirm the
configuration data at
the MSC side
Conduct active/standby
handover to the BOSN
board and replace the
BOSN board
Correct the connection
between the receiving
and transmitting
antennae
Whether the receiving
and transmitting
antennae are connected
reversely
Remotely reset
the TRM and
replace the TRM
6.
Troubleshooting
i.
Confirm the coverage where the symptom appears. If it appears
within the whole MSC range, consider checking whether the
equipment buyer or other related personnel have modified the MSC
data and related cutover operations during the cutover period.
Otherwise, go on to the next step.
ii.
Confirm whether the symptom appears within the whole MSC range
or in quite a few base stations. If yes, switch the active/standby
BOSN boards of the BSC. After that, test again to see whether the
problem still exists.
iii.
Confirm whether the symptom appears within the area covered by
a certain BS. If yes, check the wireless parameters of the cell such
as whether the maximal transmission power of the mobile phone is
