6 Message Reference

the loop delay in ms for 56 kbits/s operation. If set to 0, the MTP2 module assumes a value of 12800 for an HSL link, 400 otherwise.

rtv_attempts

Reserved. Set to 0.

t1, t2, t3, t4n, t4e, t5, t6, t7

Values for the protocol timers as defined in Q.703. These should be set to the number of (tick *

timer_res) intervals required for the timer. The timers are checked for expiry every timer_res number of ticks. The value given for t1, t2 etc. is the number of times that the timer is checked before indicating expiry.

t_suerm

Reserved. Set to 0.

t_rtv

Reserved. Set to 0.

cong_discard

The congestion discard threshold for use with the single message priority mode of operation. When the combined number of messages in the transmit and retransmit buffers reaches this threshold, further messages are discarded. The congestion discard threshold cannot be set to a value greater than 4160.

l3_link_id

The value to use in the ID field of all indications issued to the upper module (that is, MTP3). For single signaling processor systems, this is typically the same as the l2_llid. However, when a system contains more than one MTP2 processor, this may not be so.

co1, co2, co3, ca1, ca2, ca3, cd1, cd2, cd3

Congestion onset, abatement and discard thresholds for use when the Multiple Congestion Thresholds mode of operation is selected.

6.4.2API_MSG_RX_IND – Received Data Indication

Synopsis

Message generated by MTP2/ATM.

Format

 

 

MESSAGE HEADER

 

 

 

FIELD NAME

MEANING

 

 

 

type

 

API_MSG_RX_IND (0x8f01)

 

 

 

id

 

l3_link_id/upper_id

 

 

 

src

 

MTP2 module ID/ATM module ID

 

 

 

dst

 

Links upper module ID/user module ID

 

 

 

rsp_req

 

0

 

 

 

hclass

 

0

 

 

 

status

 

0

 

 

 

err_info

 

0

 

 

 

next

 

0

 

 

 

len

 

Number of octets in the Signaling Unit. For AAL5 Monitoring equals

 

number of octets in the Signaling Unit + 2.

 

 

 

 

 

 

 

PARAMETER AREA

 

 

 

OFFSET

SIZE

NAME

 

 

 

0

len- /len - 2

Signaling Unit (SU) data in binary format.

 

 

 

/len - 2

0/1

UUI - User to User Indication - AAL5 Monitoring parameter only

 

 

 

/len - 1

0/1

CPI - Common Part Indicator - AAL5 Monitoring parameter only

 

 

 

Description

Message generated by MTP2/ATM containing the Signaling Unit data received on the specified link.

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Dialogic DSI SS7MD manual Synopsis Message generated by MTP2/ATM Format, Field Name Meaning