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User Manual
Airbridge cBTS3612 CDMA Base Station
1.4.4 OML Interface
OML interface is between BTS and remote OMC. It is actually one of the Abis
interface applications, but in the application layer, OML interface is between BTS
and the remote OMC. OML interface shares resources of Abis interface, including
physical layer, ATM, AAL5 and TCP/IP. For details, please refer to the introduction to
Abis interface.
OML interface is used for OMC to perform operation and maintenance to BTS. It is
defined by equipment manufacturers. On Abis interface, it is a transparent path.
1.4.5 LMF Interface
LMF interface is the interface between BTS and Local Maintenance Function (LMF).
Its interface protocol stack is shown as below:
1.4.6 System Synchronization Interface
System synchronization interface includes GPS/GLONASS antenna interface and
system external synchronization interface.
1) GPS/GLONASS antenna interface: GPS is in compliance with ICD200c:
IRN-200C-001-IRN-200C-004: Interface Control Document of GPS. GLONASS is in
compliance with GPS/GLONASS Receiver Interface Language (GRIL).
2) System external synchronization interface: the external synchronization interface
without GPS/GLONASS is in compliance with the requirement of CDMA Digital
Cellular Mobile Communication Network GPS/GLONASS Dual-Mode Receiver and
Base Station Interface Specifications.
1.4.7 BTS Test Interface
BTS test interface provides 10MHz and 2s signals that may be necessary for
testers.
LMF Signaling Application (self - defined)
TCP
IP
Data Link Layer
Physical Layer (10/100 Base-T)
1-18
System Description
1 System Overview
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