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DSI SPCI Network Interface Boards Programmer's Manual Issue 5
65
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:
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 Status Response (if confirmation requested)
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 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.