Reference Manual

Table Of Contents
Terrestrial Link Handling
49 Terrestrial Link Handling
This function specication 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.
49.1 References
Whenever a reference is made to a function described in another chapter,
please refer to the table of contents to nd the appropriate chapter.
49.2 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 trafc
services on A-bis.
49.3 Function
49.3.1 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
Specication /GSM 08.56/.
LAPD (Link Access Protocol on the D-channel) is used for layer 2
signalling. Signalling conforms to /GSM 08.56/.
49.4 Operational Conditions
49.4.1 Operation and Maintenance
Maintenance functions relating to denition of layer 2 address (TEI) are
described within the context of Operation and Maintenance Terminal.
49.4.2 Capabilities
Not applicable.
EN/LZT 720 0008 R1A
2001-06-26
373 (421)
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