Huawei BTS3900C Hardware Description page 64

BTS3900C (Ver.C)
Hardware Description
The following table lists the specifications of CPRI ports on the GTMU.
Table 3-34 Specifications of the GTMU ports
Board
GTMU
GTMUb
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
l
l
l
l
Table 3-35 Description on S1
DIP
Switch
S1
Issue 03 (2013-05-27)
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.
Number of CPRI
Ports
6
6
S1 is used to select the E1 resistance.
S2 is used to select the grounding mode of E1/T1 transmission cables.
details on the DIP switch.
S3 is reserved.
S4 is used to select the E1 bypass.
S5 is used for timeslot settings when the E1 bypass is selected.
on the DIP switch.
DIP Setting
1 2
ON ON
OFF ON
ON OFF
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CPRI Data Rate
(Gbit/s)
1.25
1.25/2.5
Table 3-35 provides details on the DIP switch.
Table 3-37 provides details on the DIP switch.
3 4
OFF OFF
OFF OFF
OFF OFF
Others
3 BTS3900C Modules
Topo Type
Topologies of star,
chain, and ring
Topologies of star,
chain, and ring
Table 3-36 provides
Table 3-38 provides details
Description
The E1 resistance is set to
75 ohm.
The E1 resistance is set to
120 ohm.
The T1 resistance is set to
100 ohm.
Unavailable
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