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User Manual
Airbridge cBTS3612 CDMA Base Station
Satellite
Synchronization
interface
Um
interface
MS
Figure 1-3 BTS external interface
Um interface: interface with MS.
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Abis interface: interface with BSC.
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OML interface: interface with the remote OMC. It shares the transmission
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resources with Abis interface.
LMF interface: interface with BTS local maintenance console.
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System synchronization interface: including GPS/GLONASS antenna interface
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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.
BTS test interface: interface for BTS test, providing such signals as 10MHz and
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2s signal.
Remote maintenance serial interface: another interface to remote console. This
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is a standby maintenance interface can be used when the active maintenance
link between OMC and BTS is interrupted.
Environment alarm interface: interface with environment alarm collection box.
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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
Test
Environment
equipment
alarm box
Environment
Test
alarm interface
interface
BTS
Ethernet
interface
Remote maintenance serial port
MODEM
LMF
Abis interface
OML interface
PSTN
1-10
System Description
1 System Overview
BSC
OMC
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