ZTE Corporation ZXG-OB06 Manuale Utente

 
 

Chapter 3 - Interfaces and Communications 

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2.  Supporting the identification of diversified frame types. 
3.  Supporting the transparent transmission of the L3 message between 

L3 entities. 

4. Sequence control, to maintain the sequence of frames connected 

through data link. 

5.  Checking the format and operation errors in the data link layer. 
6.  Notifying the L3 entities to process the unrecoverable errors. 
7. Flow control. 
8.  Supporting access of the burst solution mode after the RACH channel 

access is instantly assigned. 

In the ZXG10 OB06 (V1.0), LapDm is implemented in the LapDm module 
of RSL. 

The position of LapDm module in RSL is shown in Figure 18. 

LapDm module

OAMM

FURRM

Physical layer

 

The LapDm module communicates with the physical layer and L3. The L3 

protocol is processed in FURRM. OAMM configures the value of the timer 
necessary for LapDm module to run. 

The LapDm module provides two types of message transmission modes for 
FURRM: I-frame multi-frame operation and UI frame operation. In terms 

of frame structure, LapDm cancels the frame delimiter flag (FLAG) and the 
FCS. In LapDm, the synchronization scheme of the radio interface can be 

used to transmit the boundary message without the corresponding start 
frame or end frame flags. The transmission scheme provided by the 
physical layer of the Um interface boasts the error check function, so FCS 

is not used for LapDm. 

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 

control mechanism for error recovering and flow control, the 
establishment mechanism and release mechanism for multi-frame 

operations.