ITU-T V.150.1

96:103 Compression Transmit String length:
If no compression or MNP5 is selected this field is not included in the message.
If compression selected is V.42 bis or V.44, this indicates the (transmit for V.44) string
length.
Valid values are 6 to 250 for V.42 bis and 32 to 255 for V.44.
104:111 Compression Receive String length:
If no compression, MNP5 is selected this field is not included in the message.
If compression selected is V.42 bis this field is set to a value of zero.
If compression selected is V.44 this indicates the receiver string length.
Valid values are 32 to 255 (0 if V.42 bis).
112:127 Compression Transmit History size:
If no compression, MNP5 or V.42 bis is selected this field is not included in the message.
If compression selected is V.44 this indicates the transmitter history size.
Valid values are from 512 to 65535.
128:143 Compression Receive History size:
If no compression, MNP5 or V.42 bis is selected this field is not included in the message.
If compression selected is V.44, this indicates the receiver history size.
Valid values are from 512 to 65535.
†The compression parameters are collectively known as the Negotiated Compression Parameter (NCP) set.
This includes the selected compression, compression direction, the dictionary, string length and history sizes.
15.4.6 Break Message (BREAK)
This message is used by a Gateway to notify its peer Gateway that it has received a break signal
from its local DCE.
TABLE 26/V.150.1
Break Message format
BREAK bits
MSB:LSB
Definition
0:3 Break Source Protocol: This four-bit field indicates the protocol that is generating the
break:
0 – V.42/LAPM; 1 – Annex A/V.42 (1996); 2 – V.14; 3 to 15– Reserved.
4:7 Break Type: This four-bit field indicates the type of break that is being generated:
0 – Not Applicable; 1 – Destructive and Expedited; 2 – Non-destructive and Expedited; 3
– Non-destructive and non-expedited; 4 to 15 Reserved
ITU-T Rec. V.150.1 (01/2003) – Prepublished version 40