60
6 Message Reference
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.
•
build_out
The following table shows the permitted values and their meanings.
3
E1 120 ohm balanced interface
4
T1
(including J1)
5
E1 120 ohm balanced interface
Value
Description
1
HDB3 (E1 only)
2
AMI
4
B8ZS (T1/J1)
Value
Description
1
E1 double frame (E1 only)
2
E1 CRC4 multiframe (E1 only)
3
F4 4-frame multiframe (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 multiframe) (T1 only)
9
J1 frame format (liu_type must be 4 [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)
Value Description
0
Setting for E1 devices
1
T1 default (T1 short haul)
2
T1 short haul 0 - 133 ft
3
T1 short haul 133 - 266 ft
4
T1 short haul 266 - 399 ft
5
T1 short haul 399 - 533 ft
6
T1 short haul 533 - 655 ft
7
Not supported.
8
T1 long haul LB0 (-0dB)
9
T1 long haul LB0 (-7.5dB)
