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DSI SPCI Network Interface Boards Programmer's Manual Issue 5

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)

src

Sending Module ID

dst MVD_TASK_ID (0x10)

rsp_req

Used to request a confirmation

hclass

status Status Response (if confirmation requested)

err_info

len

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.

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Dialogic DSI SPCI Network Interface Boards Manual de usuario Pagina 65