6 Message Reference
6.3.2LIU_MSG_CONTROL – LIU Control Request
Synopsis
Message sent by the application to dynamically control operation for a Line Interface Unit (LIU). Allows setting of outgoing alarms and diagnostic loopbacks.
Format
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| MESSAGE HEADER |
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| Field Name | Meaning | |
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type |
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| LIU_MSG_CONTROL (0x7e35) |
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id |
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| liu_id (in the range 0 to one less than the number of LIUs) |
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src |
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| Sending module ID |
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dst |
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| MVD_module_ID |
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rsp_req |
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| Used to request a confirmation. |
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hclass |
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| 0 |
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status |
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| 0 |
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err_info |
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| 0 |
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len |
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| 16 |
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| PARAMETER AREA |
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Offset |
| Size | Name |
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0 |
| 1 | ais_gen |
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1 |
| 1 | Reserved for future use, must be set to 0. |
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2 |
| 1 | loop_mode |
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3 |
| 1 | Reserved for future use, must be set to 0. |
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4 |
| 1 | prbs_gen |
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5 |
| 11 | Reserved for future use, must be set to 0. |
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Description
This message is sent to the board to perform dynamic changes to the operation of the Line Interface Unit (LIU). It allows the user to control the generation of AIS (Blue alarm) and to activate various diagnostic loopback modes. It also allows the configuration of PRBS test sequences.
The confirmation message (if requested) indicates success with a status value of 0.
Parameters
The LIU_MSG_CONTROL message includes the following parameters:
•ais_gen
The mode used to generate the Alarm Indication Signal (Blue alarm). The following table shows the permitted values and their meanings.
Value | Description |
0Do not change AIS/Blue alarm generation mode
1Disabled; do not generate AIS/Blue alarm
2Enabled; generate AIS/Blue alarm
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