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User Manual
Airbridge cBTS3612 CDMA Base Station
Its modularized structure reduces the internal connections and improves the
reliability of the system, and thus makes the installation and maintenance easier.
In the case of whole BTS interruption due to power supply or transmission causes,
the cBTS3612 system can restart automatically right after the faults are cleared.
1.2.4 Flexible Networking Mode
I. Networking for large capacity and wide coverage
A single cabinet supports as many as 12 sector carriers. 3 cabinets can be
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combined to provide a maximum capacity of 36 sector carriers.
Large-capacity trunk. Abis interface of BTS supports as many as 16 E1s
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transmission. The coming version will support STM -1 optical transmission in
ATM mode at Abis interface and provide two STM -1 ports for Abis interface
trunk.
Support multiple BTS configurations such as omni 4 carriers, 1%3, 2%3, 12%3,
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6%6(carrier%sector) configurations.
II. Supporting multiple BTS networking modes such as chain, star and tree
Refer to "4.1 Transmission Networking" for details.
III. Soft BTS networking (the SoftSite will be available in the coming version)
In this networking mode, the baseband unit adopts the centralized processing mode.
The baseband signals and maintenance information are transferred through the fiber
to the SoftSite (ODU3601C). The SoftSite can be applied indoors, outdoors or
underground.
The SoftSite, small in size, is equipped with built-in power supply, temperature
regulator and monitoring device. It can be used in severe environments, e.g.
outdoors. The feeder loss of the SoftSite is trivial, making large coverage for macro
cells possible.
SoftSites in the chain-networking mode are applicable to highways and subways. A
maximum of 6 SoftSites can be connected in serial in one pair of optical fibers.
1.2.5 Reliable Power Supply System
The DC/DC power supply with -48V DC power input, and +27V DC output is
adopted. The whole power supply system is composed of 5 modules in full
configuration, with automatic current equalization function, 4+ 1 redundancy, meeting
the requirement of 8000W power supply.
1-5
System Description
1 System Overview
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