Figure 3-16
Positions of DIP switches on the UMPT
Each DIP switch has four bits. The DIP switches have the following functions:
l
SW1 is used to select the E1/T1 mode.
l
SW2 is used to select the grounding mode of E1/T1 transmission.
DIP switch.
Table 3-13
DIP switch SW1
DIP
Switch
DIP Status
Description
1
2
3
4
SW1
ON
ON
Reserved
Reserved
The E1 resistance is set to
75 ohms.
OFF
ON
The E1 resistance is set to
120 ohms.
ON
OFF
The T1 resistance is set to
100 ohms.
Table 3-14
DIP switch SW2
DIP
Switch
DIP Status
Description
1
2
3
4
SW2
OFF
OFF
OFF
OFF
Balanced
ON
ON
ON
ON
Unbalanced
3.1.6 WMPT
The WCDMA main processing and transmission unit (WMPT) processes signals for the
BBU3900 and manages resources for other boards in the BBU3900.
BTS3900C (Ver.C)
Hardware Description
3 BTS3900C Modules
Issue 03 (2013-05-27)
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