Specifications

4 Message Reference
34
liu_type
Description
1
Disabled (used to deactivate a LIU). In this mode the LIU does not produce
an output signal.
3
E1 120ohm balanced interface.
4
T1
5
E1 120ohm balanced interface.
Note: This must be selected by the user to be appropriate for the actual hardware fitted otherwise
an error status is returned.
line_code
The line coding technique taken from the following table:
line_code
Description
1
HDB3 (E1 only).
2
AMI with no Zero Code Suppression.
3
AMI with Zero Code Suppression (The appropriate bit in the clear_mask
parameter may be set to disable Zero Code Suppression for individual
timeslots if required.) (T1 only).
4
B8ZS (T1 only).
frame_format
The frame format taken from the following table:
frame_format
Description
1
E1 double frame (E1 only).
2
E1 CRC4 multiframe (E1 only).
4
D3/D4 (Yellow alarm = bit 2 in each channel) (T1 only).
7
ESF (Yellow alarm in data link channel) (T1 only).
crc_mode
The CRC mode taken from the following table:
crc_mode
Description
1
CRC generation disabled.
2
CRC4 enabled (frame_format must be set to 2).
3
CRC4 compatibility mode (frame_format must be set to 2).
4
CRC6 enabled (frame_format must be set to 7).
build_out
Configurable line build out is not supported by the board, so the following fixed values
must be used.
build_out
Description
0
Setting for E1 devices.
1
Setting for T1 devices.