General Troubleshooting Procedures
76
Testing BTS connectivity using Ping
If a customer cannot access the web interface of the BTS or fails to ping it, then it is likely that there is an
issue with the cables. This is a test that is recommended during initial installation to ensure that the BTS
can be powered and started to operate.
Troubleshooting BTS using Resistors Table
The process of using the Resistors Table must be executed during the pre-installation process of the
radios. In this process, the resistance values of the radio RJ45 port transformers are used to check
whether the cables between the radio and LPUs are correctly wired.
However, it can also be used for general troubleshooting before deciding to bring the BTS down from the
tower and cause service disruption to all customers in that sector.
Pre-power testing
Before plugging the RJ45 cable from the lower LPU (or if not fitted the BTS or CPE) into the switch or
router, check the following resistances at the RJ45 cable (as listed in
Table 8
):
Table 8: Details of resistances for the RJ45 cable (for reference only)
Cable length (in
meters)
Resistance pins 1&2,
3&6, 4&5 and 7&8 ohms
Resistance pins 1&2,
3&6, 4&5 and 7&8 ohms
Resistance between pins 4&7
ohm
0
0.8
1.0
1.6
10
2.5
2.7
3.3
20
4.2
4.4
5.0
30
5.9
6.1
6.7
40
7.6
7.8
8.4
50
9.3
9.5
10.1
60
11.0
11.2
11.8
70
12.7
12.9
13.5
80
14.4
14.6
15.2
90
16.1
16.3
16.9
100
17.8
18
18.6
150
26.3
26.5
27.1
200
34.8
35
35.6
250
43.3
43.5
44.1
300
51.8
52
52.6
Consider the following points for the pre-power testing:
l
Check the cable resistance between pins 1&2, 3&6, 4&5, and 7&8 at the RJ45. Check against
column 2 in
Table 8
.
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