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User Manual
Airbridge cBTS3612 CDMA Base Station
The air discharge tube discharges the high voltage to the ground and lowers the
voltage to less than 600V. Then the voltage limit mesh further lowers the voltage to
less than 30V.
III. Interface
E1interface
l
Interface with BSC (DB25).
Connection with BCIM (DB37)
IV. Index
Board size: 140mm%120mm
Bearable surge current: >10kA (common mode), >5KA (differential mode)
Output residual voltage: <30V.
2.2.8 Fan Module (BFAN)
BFAN is installed right under the baseband subrack, serving as a part of the blower
type cooling system of the baseband subrack. The fan module consists of two fan
boxes, each of which has 4 fan units (24V DC brush-free fan), and one BTS Fan
Monitor Module (BFMM). Fan enclosure is used for installation of fan boxes. The
outside of the fan enclosure is the BTS Fan Block Interface Board (BFNB) that
provides a system interface. The structure of BFAN is as shown in Figure 2-10.
2-20
System Description
2 Hardware Architecture
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