DBS3900 V300R008
Product Description
Issue 04 (2008-06-11)
Commercial in Confidence
Page 14 of 46
2.4 Clock and Synchronization
When the synchronization clock operates in free-run mode, the system can
operate normally for at less than 7 days in succession.
Software synchronization mode is supported.
Phase-locked, fast pull-in, and holdover functions, as well as free run mode, are
supported.
Synchronization with the clock extracted from the Abis interface (default) is
supported.
Synchronization with the Global Positioning System (GPS) equipment is
supported.
Synchronization with the external 2 MHz BITS clock is supported.
2.5 Multi-Band Application
The RRU3004 can operate over the 1800 MHz and 900 MHz bands.
2.6 Antenna
The antenna has the following features:
Remote Electric Tilt (RET) antenna is supported.
The RET supports remotely adjustment of the antenna downtilt to optimize
network performance. The maintenance personnel can use the RET in the
equipment room to precisely adjust the network coverage. This minimizes the
maintenance operation and saves the maintenance cost.
The RET has a built-in mechanically adjustable phase shifter, which is driven by a stepper
motor outside the antenna. On the LMT, the maintenance personnel issues command, upon
which the stepper motor adjusts the phase of the phase shifter to adjust the antenna dowtilt.
Dual polarization antenna is supported to reduce the number of antennas in the
cells.
Antenna Interface Standards Group (AISG1.1) protocol is supported.
AISG is a standardization organization established by several equipment suppliers. It aims to
achieve internationally accepted antenna interfacing. The AISG protocols specify unified
standards for antenna devices such as Remote Electrical Tilt (RET) and Tower Mounted
Amplifier (TMA). These standards apply to physical layer (L1), data link layer (L2), and
application layer (L7). The AISG protocol also defines the specifications for hardware such as
connectors and sockets. The RRU3004 AISG interface is mainly used for the power supply and
control of the TMA and Remote Electrical Tilt (RET).
