Terrestrial Link Handling
55 Terrestrial Link Handling
This function specification covers RBS functions for layer 2
communication on A-bis.
The function Layer 2 Link Handling is used for layer 2 signalling to/
from RBS.
55.1 References
Whenever a reference is made to a function described in another chapter,
please refer to the table of contents to find the appropriate chapter.
55.2 Concepts
Operation and Maintenance Link
Layer 2 communication link for operation
and maintenance services on A-bis.
Radio Signalling Link Layer 2 communication link for traffic
services on A-bis.
55.3 Function
55.3.1 Layer 2 Link Handling of OML and RSL
The link layer used for signalling on the A-bis interface between BSC
and BTS is established and maintained according to Technical
Specification /GSM 08.56/.
LAPD (Link Access Protocol on the D-channel) is used for layer 2
signalling. Signalling conforms to /GSM 08.56/.
55.4 Operational Conditions
55.4.1 Operation and Maintenance
Maintenance functions relating to definition of layer 2 address (TEI) are
described within the context of Operation and Maintenance Terminal.
55.4.2 Capabilities
Not applicable.
EN/LZT 720 0008 P2A
2001-11-28
435 (485)
© Ericsson Radio Systems AB
— All Rights Reserved —
Preliminary
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