O&M Signal Flow; Clock Signal Flow - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station
7.4 O&M Signal Flow
The operations and maintenance over the BTS, originated either from the remote BAM
or from the local maintenance terminal, are implemented by the OMU on the BCKM.
The blue continuous lines in Figure 7-1 represent the O&M signal flows between the
OMU and various boards in the BTS, while the blue dotted lines represent the flows
between the OMU and the MC and CLK units on the BCKM.

7.5 Clock Signal Flow

The BCKM receives satellite signals through the GPS/GLONASS synchronization
antenna. The CLK unit processes the received signal and outputs 2S signal, 25MHz
signal and 16%1.228MHz signal to the clock bus. The boards in the BTS obtain the
required clock signals from the clock bus.
The BCIM gets the 25MHz clock signal from the clock bus, which will be
processed by the clock unit of the BCIM to produce other desired clock signals.
The BRDM gets the 2S signal, 25MHz signal and 16%1.228MHz signal from the
clock bus, which will be processed by the clock unit of the BRDM to produce other
desired clock signals.
The BCPM gets the 2S signal, 25MHz signal and 16%1.228MHz signal from the
clock bus, which will be processed by the clock unit of the BCPM to produce other
desired clock signals.
The BTRM gets 100%1.228MHz signal from the Gbit Ethernet bus (optical
interface), which will be processed by the clock unit of the BTRM to produce other
desired clock signals such as 48%1.228MHz, 50%1.228MHz and 2S signals.
7-5
System Principle
Chapter 7 BTS Signal Flows