Zte ZXG10 OB06, Technical Manual

Page: 57 / 117

Chapter 4 - System Functions
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The procedure of the link establishment originated by the BSC is shown in
Figure 24.
F
I G U R E
2 4 B S C - O
R I G I N A T E D
L
I N K
E
S T A B L I S H M E N T
MS LAPDm FURRM
HPIMan
LAPD
BSC OAMM
Dm_DL_EST_
REQ
DL_DATA _ IND (EST REQ)
(EST REQ)
(SABM)
(UA)
Dm _DL _EST_
CONF
DL_ DATA_REQ (EST_CONF)
(EST CONF)
The BSC requests the OB06 to establish a link for point-to-point
transmission (SAPI=3) on the wireless path.
A link establishment failure is shown in Figure 25.
F
I G U R E
2 5 F
A I L U R E O F
L
I N K
E
S T A B L I S H M E N T
MS LAPDm FURRM
HPIMan
LAPD
BSC OAMM
Dm_ DL_EST_
REQ
DL_DATA _IND (EST REQ)
(EST REQ)
(SABM)
Dm_ DL_REL_IND
DL_DATA _REQ (REL IND)
(REL IND)
Dm_M DL_ERR_
IND
(ERR IND)
DL _DATA_REQ (ERR IND)
When the link connection fails, the FURRM receives the Dm_DL_REL_IND
and Dm_MDL_ERROR_IND primitives from the data link layer. The latter
primitive records the failure cause: "Timer T200 expires for N200 + 1
times: Execution is released abnormally" The FURRM attaches this cause
in the ERROR REPORT message and reports it to the BSC.