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Operation and Support Subsystem (OSS)
• OSS consists of two entities not fully specified in GSM. They are – Operation and Maintenance Center (OMC) – Network Management Center (NMC) • Performs alarm handling, fault management, performance management, configuration management, traffic data acquisition, activate and deactivate functions, and long term planning. • Normally centralized in a network.
• A-Interface ---- between BSC and MSC, E1 link. • Abis-Interface ---- between BTS and BSC using LADP (Link Access Data Protocol) protocol. • B-Interface ---- between MSC and VLR • C-Interface ---- between MSC and HLR • D-Interface ---- between HLR and VLR • E-Interface ---- between MSCs • F-Interface ---- between MSC and EIR • Um-Interface ---- between MSS and BSS.
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