6 Message Reference
86
6.4.6
MTP2 Level 2 State Indication
Synopsis:
Indication issued by the board every time the level 2 link state control state
machine changes state.
Message Format:
MESSAGE HEADER
Field Name
Meaning
type MGT_MSG_SS7_STATE
(0x0201)
id llid
(Level 2 logical link id - 0 ... 3)
src SS7_TASK_ID
dst 0xdf
rsp_req
0
hclass
0
status Link
State
(see below)
err_info
Reserved for future use
len
0
Description:
This message is issued by the MTP2 module every time a change of state
takes place at level 2. It is intended only for diagnostic use by system
management. Normally the MTP Pause and MTP Resume Indications are used
by the user parts to determine destination accessibility.
The level 2 link state control state machine is defined in Q.703.
Parameter Description:
Link State
The status field in the message header is used to indicate the state that has
just been entered. It is coded as follows:
Value
Mnemonic
State
1
S7S_IN_SERVICE
In Service
2
S7S_OUT_SERVICE
Out of Service
3
S7S_INIT_ALIGN
Initial Alignment
4
S7S_ALIGN_NOT_RDY
Aligned, Not Ready
5
S7S_ALIGN_READY
Aligned, Ready
6
S7S_PROC_OUTAGE
Processor Outage
