Dialogic® DSI SPCI Network Interface Boards Programmer's Manual Issue 5
6.3.7CT 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:
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| MESSAGE HEADER |
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Field Name |
| Meaning |
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type |
| MVD_MSG_SC_LISTEN (0x7e17) |
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id |
| 0 |
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src |
| Sending Module ID |
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dst |
| MVD_TASK_ID (0x10) |
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rsp_req |
| Used to request a confirmation |
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hclass |
| 0 |
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status |
| Status Response (if confirmation requested) |
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err_info |
| 0 |
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len |
| 6 |
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| PARAMETER AREA |
Offset | Size | Name |
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0 | 2 | liu_id |
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2 | 2 | timeslot |
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4 | 2 | sc_channel |
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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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