User Manual
Airbridge cBTS3612 CDMA Base Station
System Description
1 System Overview
1-10
BTS
Abis interface
Um
interface
MS
Satellite
Synchronization
interface
OML interface
Test
interface
Ethernet
interface
Remote maintenance serial port
PSTN
Environment
alarm interface
Environment
alarm box
BSC
OMC
LMF
MODEM
Test
equipment
Figure 1-3
BTS external interface
l
Um interface: interface with MS.
l
Abis interface: interface with BSC.
l
OML interface: interface with the remote OMC. It shares the transmission
resources with Abis interface.
l
LMF interface: interface with BTS local maintenance console.
l
System synchronization interface: including GPS/GLONASS antenna interface
and system external synchronization interface. When GPS/GLONASS is not
available and there is other clock synchronization equipment, the clock
synchronization output of the equipment can be connected with the external
synchronization interface of BTS system.
l
BTS test interface: interface for BTS test, providing such signals as 10MHz and
2s signal.
l
Remote maintenance serial interface: another interface to remote console. This
is a standby maintenance interface can be used when the active maintenance
link between OMC and BTS is interrupted.
l
Environment alarm interface: interface with environment alarm collection box.
1.4.2 Um Interface
I. Overview
In Public Land Mobile Network (PLMN), MS is connected with the fixed part of the
network through the radio channel, which enables the subscribers to be connected