NOTE
(1) Before accessing the base station through the ETH port, ensure that an OM port has been opened and
the user has obtained required authorities for accessing the base station through the OM port.
(2) The TST port is used for commissioning the base station rather than importing or exporting the base
station configuration.
(3) The security of the USB port is ensured by encryption.
The following table lists the specifications of CPRI ports on the GTMU.
Table 3-34 Specifications of the GTMU ports
Board Number of CPRI
Ports
CPRI Data Rate
(Gbit/s)
Topo Type
GTMU 6 1.25 Topologies of star,
chain, and ring
GTMUb 6 1.25/2.5 Topologies of star,
chain, and ring
DIP Switch
On the GTMU, there are five DIP switches, each of which has four bits. DIP switches S1 and
S2 need to be set jointly. The functions of the five DIP switches are as follows:
l S1 is used to select the E1 resistance. Table 3-35 provides details on the DIP switch.
l S2 is used to select the grounding mode of E1/T1 transmission cables. Table 3-36 provides
details on the DIP switch.
l S3 is reserved.
l S4 is used to select the E1 bypass. Table 3-37 provides details on the DIP switch.
l S5 is used for timeslot settings when the E1 bypass is selected. Table 3-38 provides details
on the DIP switch.
Table 3-35 Description on S1
DIP
Switch
DIP Setting 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
BTS3900C (Ver.C)
Hardware Description 3 BTS3900C Modules
Issue 03 (2013-05-27) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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