ZTE Corporation ZXG-BTS2 Benutzerhandbuch
Chapter 3 - Interfaces and Communications
Confidential and Proprietary Information of ZTE CORPORATION 49
7. Traffic control
Functions 1, 2 and 4 hereof are completed automatically by the hardware,
while functions 3, 5, 6 and 7 are implemented via the software.
Functions 1, 2 and 4 hereof are completed automatically by the hardware,
while functions 3, 5, 6 and 7 are implemented via the software.
In ZXG10-BTS(V2.9), LapD is mainly realized in the LapD module of RSL.
The position of the LapD module in RSL is shown in Figure 24.
The position of the LapD module in RSL is shown in Figure 24.
F
I G U R E
2 4
P
O S I T I O N O F T H E
L
A P
D M
O D U L E
LapD Module
OAMM
FURRM
Physical Layer
BSC
The LapD module communicates with the physical layer and L3.The L3
protocol is processed in FURRM.
OAMM configures the parameters such as TEI and values of the timer
necessary for the LapD module to run.
The LapD module provides the FURRM with two information transmission
modes: I-frame multi-frame operation and UI frame operation.
1. I-frame multi-frame operation
The L3 message is sent in the information frame mode which requires
the confirmation from the receiver. This mode provides a whole set of
the confirmation from the receiver. This mode provides a whole set of
control mechanism for error recovering and flow control, the
establishment mechanism and release mechanism for multi-frame
operations.
The I-frame structure is shown in Figure 25, including the flag
sequence, address field, control field, information field and check field.
establishment mechanism and release mechanism for multi-frame
operations.
The I-frame structure is shown in Figure 25, including the flag
sequence, address field, control field, information field and check field.
F
I G U R E
2 5
I - F
R A M E
S
T R U C T U R E O F
L
A P
D
flag
Address
Control
Information
FCS
flag
SAPI
TEI
N(S)
N(R)
1
0-260
2
1