Figure 7-4 Physical Loopback Of E1/T1 On The Bts Side; Table 7-2 Meaning Of The State Of The Liu Leds (Uelp Used) - Huawei BTS3900 GSM Commissioning Manual
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- Commissioning manual (97 pages) ,
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BTS3900(A) GSM
Commissioning Guide
1.
2.
3.
Issue 02 (2009-04-20)
Ensure that the E1/T1 cable is securely connected to the OUTSIDE port on the UELP, and
that the connectors are in sound condition. If the connector is damaged, replace it.
Ensure that the E1 transfer cable is securely connected to the INSIDE port on the UELP
and the E1/T1 port on the GTMU, and that the connectors are in sound condition. If the
connector is damaged, replace it.
Perform the physical loopback test and troubleshoot the fault in the UELP.
(1) Perform a physical loopback on the BTS side. In general, for a pair of E1s/T1s
connecting the BTS and BSC through the DDF, port A0 is connected to port C0, and
port B0 is connected to port D0. In the loopback test, disconnect port A0 from port
C0, and port B0 from port D0, and then connect port A0 to port B0, as shown in
7-4. In this way, the physical loopback is formed on the BTS side.
Figure 7-4 Physical loopback of E1/T1 on the BTS side
E1/T1
E1/T1
BTS
(2) You need check the state of the LIU LEDs corresponding to the E1/T1 in use, as
shown in
Table
7-2.
Table 7-2 Meaning of the state of the LIU LEDs (UELP used)
If...
The LEDs are OFF
The LEDs are ON or ON for 0.125s and
OFF for 0.125s
(3) Disconnect the E1 transfer cable and the E1/T1 cable. Then, directly connect the E1/
T1 cable to the E1/T1 port on the GTMU.
(4) When the UELP is not used, determine whether the E1/T1 link is normal based on the
state of the LIU LEDs on the GTMU panel, as listed in
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
A0
C0
E1/T1
E1/T1
B0
D0
DDF0
Then...
The cable connections on the BTS side
are operational. The fault of the UELP
is cleared. The testing task on the BTS
side is complete.
The cable connections on the BTS side
are faulty. Clear the fault of the UELP.
7 FAQs for BTS Commissioning
A1
C1
E1/T1
E1/T1
B1
D1
DDF1
Table
7-3.
Figure
BSC
7-5
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