ZTE Corporation ZXG-OB06 Manuale Utente
Chapter 4 - System Functions
Confidential and Proprietary Information of ZTE CORPORATION 43
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.
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
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.
in the ERROR REPORT message and reports it to the BSC.