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4 Message Reference

4.3.6 MVD_MSG_SC_LISTEN - 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).

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

liu_id

timeslot

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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