Welltech SPCI2S Intel NetStructure SS7 Boards - Manual (Page 77)

SS7 Programmer’s Manual for SPCI2, SPCI4 and CPM8 Issue 2 Page 77
5.4.3 MTP Transfer Request
Synopsis:
Primitive request sent to MTP3 to convey a Message Signal Unit (MSU) to the
board for transmission.
Message Format:
MESSAGE HEADER
FIELD NAME MEANING
type API_MSG_TX_REQ (0xcf00)
id user_part_reference
src Sending module ID
dst MTP_TASK_ID
rsp_req
0
hclass 0
status 0
err_info 0
len Number of MSU octets in parameter area
PARAMETER AREA
OFFSET SIZE NAME
0 len MSU data in binary format ready for
transmission, commencing with the Service
Information Octet (SIO) and followed directly
by the Signalling Information Field (SIF). The
level 2 information (ie BIB, BSN, FIB, FSN LI
and FCS) is added by the board.
Description:
This message is used to convey Message Signal Units from the user part to the
Message Transfer Part (MTP) on the board for subsequent transmission into
the SS7 Network.
The user part should only issue messages to destination point codes for which
an MTP Resume indication has been received, otherwise no route is currently
available to the destination and the message will be discarded by the Message
Transfer Part in accordance with Q.704.
No confirmation messages are issued.