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7 Configuration Command Reference
• <board_id>
The logical identity of the board in the range from 0 to one less than the number of boards supported.
• <liu_id>
The identifier of the T1/E1/J1 Line Interface Unit (LIU) in the range from 0 to one less than the number
of LIUs.
• <liu_type>
The physical interface type. The following table shows the permitted values and their meanings.
Note: The option chosen by the user must be appropriate to the actual hardware fitted, otherwise an
error status is returned.
• <line_code>
The line coding technique. The following table shows the permitted values and their meanings.
• <frame_format>
The frame format. The following table shows the permitted values and their meanings.
• <crc_mode>
The CRC mode. The following table shows the permitted values and their meanings.
Value Description
1
Disabled (used to deactivate an LIU). In this mode the LIU does not produce an
output signal.
3 E1 120 ohm balanced interface
4 T1 (including J1)
5 E1 120 ohm balanced interface (preferred setting for E1 operation)
6 E1 high-impedance (for monitoring applications)
7 T1 (including J1) high-impedance (for monitoring applications)
Value Description
1 HDB3 (E1 only)
2AMI
4 B8ZS (T1/J1)
Value Description
1 E1 double frame (E1 only)
2 E1 CRC4 multiframe (E1 only)
3 F4 4-frame multi-frame (T1 only)
4 D3/D4 (Yellow alarm = bit 2 in each channel (T1 only)
7 ESF (Yellow alarm in data link channel (T1 only)
8 F72/SLC96 (72-frame multi-frame) (T1 only)
9 J1 frame format (liu_type must be T1)
Value Description
1 CRC generation disabled
2 CRC4 enabled (frame_format must be set to 2)
4 CRC6 enabled (frame_format must be set to 7)