Welltech SPCI2S Intel NetStructure SS7 Boards - Manual (Page 60)

SS7 Programmer’s Manual for SPCI2, SPCI4 and CPM8 Issue 2 Page 60
5.3.7 CT bus Listen Request
Synopsis:
Message sent to the board to establish a connection from the CT bus to an
outgoing timeslot on an E1 / T1 Line Interface Unit (LIU).
Message Format:
MESSAGE HEADER
FIELD NAME MEANING
type MVD_MSG_SC_LISTEN (0x7e17)
id
0
src Sending Module ID
dst MVD_TASK_ID (0x10)
rsp_req
Used to request a confirmation
hclass 0
status 0
err_info 0
len 6
PARAMETER AREA
OFFSET SIZE NAME
0 2 liu_id
2 2 timeslot
4 2 sc_channel
Description:
This message is sent to the board to establish a connection from the CT bus to
an outgoing timeslot on the E1 / T1 Line Interface Unit (LIU). It is issued by the
application and is typically used at the start of each call although it may also be
issued during a call to connect to a different resource.
Correct operation of this message is dependent upon the use, at initialisation
time, of the MVD_MSG_SC_DRIVE_LIU message (or the LIU_SC_DRIVE
command in config.txt when using s7_mgt).
When a new call arrives the application should use this message to connect the
appropriate resource from the CT bus out to the network. When the call
finishes the application should use the MVD_MSG_SC_FIXDATA message to
generate the appropriate IDLE pattern on the LIU.
The MVD_MSG_SC_LISTEN message can also be generated at configuration
time using s7_mgt as a result of the SCBUS_LISTEN command in the
config.txt file. However, this will of course only set up a static configuration and
will still require the user application to control any dynamic connections.