Ct Bus Listen Request - Dialogic DSI SPCI Network Interface Boards Programmer's Manual

6.3.7

CT bus Listen Request

Synopsis:
Message sent to the DSI SPCI Board to establish a connection from the CT
bus to an outgoing timeslot on an T1/E1 Line Interface Unit (LIU).
Message Format:
Field Name
type
id
src
dst
rsp_req
hclass
status
err_info
len
Offset
0
2
4
Description:
This message is sent to the DSI SPCI Board to establish a connection from
the CT bus to an outgoing timeslot on the T1/E1 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 initialization
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 uses this message to connect the
appropriate resource from the CT bus out to the network. When the call
finishes, the application uses 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 only sets up a static configuration and still
requires the user application to control any dynamic connections.
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Dialogic DSI SPCI Network Interface Boards Programmer's Manual Issue 5
MESSAGE HEADER
Meaning
MVD_MSG_SC_LISTEN (0x7e17)
0
Sending Module ID
MVD_TASK_ID (0x10)
Used to request a confirmation
0
Status Response (if confirmation requested)
0
6
PARAMETER AREA
Size Name
2 liu_id
2 timeslot
2 sc_channel
65