Abb; Functions; Panel; Figure 3-1 Abb Working Principle - Huawei BTS3 Series Hardware Description Manual

M900/M1800 BTS3X Series Base Transceiver Station
Hardware Description Manual
Board Name
TMU
TRB
TRX

3.2 ABB

3.2.1 Functions

The ABB is applied in the BTS chain topology. It is in charge of the BTS transmission trunk.
When power failure occurs at a certain level (middle level) of the BTS in the chain topology,
the ABB bypasses the Abis transmission line off this site and directly connects it to the
downstream BTS. In this way, even if power failure occurs at a middle-level site in the chain
topology, services of the downstream site are not affected. For details, see

Figure 3-1 ABB working principle

BSS System
The ABB can also perform loopback at the transmission line. Then the ABB can loop back E1
signals for the BSC to detect the quality of entire transmission link if power fails at the end-
level BTS.

3.2.2 Panel

Figure 3-2
Issue 01 (2006-11-18)
Full Name
Timing/Transmission and Management Unit
Transceiver Backplane
Transceiver unit
The TEU has two board types: the ASU and the PAT. The board type can be selected on the basis of the
configurations on site.
The hardware version of the ABB described in this section is REV.0.
ABB
BSC
TMU
site1
shows the ABB panel.
Huawei Technologies Proprietary
ABB ABB
TMU TMU
site2 site3
3 Board
Figure 3-1.
3-3