Specifications

4 Message Reference
44
4.3.2 LIU_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
MESSAGE HEADER
Field Name
Meaning
type
LIU_MSG_CONTROL (0x7e35)
id
liu_id (in the range 0 to one less than the number of LIUs)
src
Sending module ID
dst
MVD_module_ID
rsp_req
Used to request a confirmation.
hclass
0
status
0
err_info
0
len
16
PARAMETER AREA
Offset
Size
Name
0
1
ais_gen
1
1
Reserved for future use, must be set to 0.
2
1
loop_mode
3
1
Reserved for future use, must be set to 0.
4
1
prbs_gen
5
11
Reserved for future use, must be set to 0.
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.