Reference Manual

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)

Preliminary