Label
Connector
Description
ETH
RJ-45 connector
Local maintenance and debugging port
FE0
RJ-45 connector
Connected to the routers in the equipment room
through FE cables to transmit network
information
FE1
DLC connector
Connected to the routers in the equipment room
through optical cables to transmit network
information
USB
USB connector
Used for automatic software upgrade through the
USB disk
TST
USB connector
Provides a reference clock for the tester
E1/T1
DB26 female
connector
Used for four E1/T1 inputs and outputs between
the GTMU and the UELP or between BSCs
The
RST
button on the panel of the GTMU is used for resetting the board.
DIP Switches
On the GTMU, there are five DIP switches, each of which has four bits. DIP switches
S1
and
S2
must be set together. The functions of the five DIP switches are as follows:
l
S1
is used to select the E1 resistance.
provides details on the DIP switch.
l
S2
is used to select the grounding mode of E1/T1 cables.
DIP switch.
l
S3
is reserved.
l
S4
is used to select the E1 bypass.
provides details on the DIP switch.
l
S5
is used for timeslot settings when the E1 bypass is selected.
provides details
on the DIP switch.
Table 4-4
Details of the DIP Switch
S1
DIP
Switch
Bit Status
Description
1
2
3
4
S1
ON
ON
OFF
OFF
The E1 resistance is set to
75 ohm.
OFF
ON
OFF
OFF
The E1 resistance is set to
120 ohm.
ON
OFF
OFF
OFF
The T1 resistance is set to
100 ohm.
Others
Unavailable
4 BTS3900 Components
BTS3900
Hardware Description
4-8
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Issue 04 (2011-02-15)