Chapter 3 - Interfaces and Protocols
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LAPD in ZXG10-OB06 (V1.0) implements the following functions:
•
Implementation through hardware:
•
Provide one or multiple data connections in D-channel: Data Link
Connection Identifier (DLCI) identifies the data link connections in
the frames. DLCI consists of Terminal Equipment Identifier (TEI)
and Service Access Point Identifier (SAPI). It indicates the service
and entity that are accessed.
•
Delimitation: Location and transparency of the frame
•
Error detection
•
Implementation through software:
•
Sequence control: Ensuring sequential transmission of the frames
•
Error detection and recovery
•
Notifying the management entity of the un-recoverable error
•
Traffic control
ZXG10-OB06 (V1.0) implements LAPD in RSL LAPD module. Figure 15
shows the position of LAPD module in RSL.
F
I G U R E
1 5
–
L A P D
M
O D U L E
P
O S I T I O N
LapD module
OAMM
FURRM
Physical layer
BSC
LAPD module communicates with the physical layer and L3. L3 protocol is
processed in
Frame Unit Radio Resource Management
(FURRM).
OAMM configures the parameters such as TEI and values of the timer
necessary for the LAPD module to run.
The LAPD supports following three types of information:
•
Signaling (including short message information)
•
O&M information
•
LAPD layer management information
LAPD module provides two types of operations regarding transmission
modes for the FURRM:
