ITU-T V.150.1
ITU-T V.150.1
ITU-T V.150.1
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TABLE 17/<strong>V.150.1</strong><br />
INIT definitions<br />
INIT bits<br />
MSB:LSB<br />
Definition<br />
0 NECRxCH if set to binary-one indicates to the Gateway receiving the message that if the<br />
peer Gateway has no Error Control then it prefers to receive on the IP-TLP using the nondefault<br />
transport channel (RSC). If binary zero then the default channel is used (USC).<br />
1 ECRxCH if set to binary-one indicates to the Gateway receiving the message that if the<br />
connection ends up in an asymmetric non-EC configuration and if the peer Gateway is<br />
using an Error Control protocol, then the local Gateway prefers to receive on the IP-TLP<br />
using the non-default transport channel (USC). If binary zero then the default channel is<br />
used(RSC).<br />
2 XID Profile exchange. This optional capability is supported if set to a binary one.<br />
3 Asymmetrical Data Types. If this bit is set it indicates that the Gateway has the optional<br />
capability of supporting different data types in its transmitter and receiver simultaneously.<br />
4:15 Optional MoIP Data types. This field indicates the optional data types that are supported<br />
by the Gateway’s receiver. Support is indicated by a value of binary ONE in the<br />
appropriate bit position. A binary ZERO indicates no support.<br />
B4: I_RAW-BIT support,<br />
B5: I_FRAME support<br />
B6: I_CHAR-STAT support<br />
B7: I_CHAR-DYN support<br />
B8…B15: Reserved for <strong>ITU</strong>-T; these bits are set to zero by the transmitter and not<br />
interpreted by the receiver.<br />
15.4.2 N-TCX XID Exchange Message (XID_XCHG)<br />
This message is sent by the Gateway to indicate the XID parameters for compression negotiation.<br />
XID_MSG may only be used in connection scenario MR1.<br />
XID_XCHG<br />
bits<br />
MSB:LSB<br />
TABLE 18/<strong>V.150.1</strong><br />
XID_XCHG definitions<br />
Definition<br />
0:7 Error correcting protocol (ECP). The following values are used to indicate the error<br />
correction protocol contained in the local link negotiation.<br />
0: No link layer protocol (compression is not negotiated)<br />
1: V.42/LAPM<br />
2: Annex A/V.42 (1996)<br />
3…255: Reserved<br />
<strong>ITU</strong>-T Rec. <strong>V.150.1</strong> (01/2003) – Prepublished version 34
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