6 Message Reference
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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
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| MESSAGE HEADER |
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FIELD NAME | MEANING | |
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type |
| API_MSG_RX_IND (0x8f01) |
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id |
| l3_link_id/upper_id |
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src |
| MTP2 module ID/ATM module ID |
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dst |
| Links upper module ID/user module ID |
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rsp_req |
| 0 |
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hclass |
| 0 |
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status |
| 0 |
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err_info |
| 0 |
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next |
| 0 |
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len |
| Number of octets in the Signaling Unit. For AAL5 Monitoring equals |
| number of octets in the Signaling Unit + 2. | |
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| PARAMETER AREA |
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OFFSET | SIZE | NAME |
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0 | Signaling Unit (SU) data in binary format. | |
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/len - 2 | 0/1 | UUI - User to User Indication - AAL5 Monitoring parameter only |
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/len - 1 | 0/1 | CPI - Common Part Indicator - AAL5 Monitoring parameter only |
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Description
Message generated by MTP2/ATM containing the Signaling Unit data received on the specified link.
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