TS Supplement (Includes RFC-1006 Support)

Changes in the Transport Layer When Using RFC-1006

Introduction to RFC-1006

1–18 107751 Tandem Computers Incorporated

Transport Packet Header

This field contains the following three fields:

Version

This field is 8 bits long. It has the value of 3, which represents Version 3 of the

RFC 1006 standard.

Reserved

This field is unused.

Packet Length

This field is 16 bits long. It indicates the length of entire TCP transport packet,

in octets. This length is the length of the transport packet header (4 octets)

plus the length of the TPDU.

TPDU

The TPDU contains two parts: TPDU Header and (optionally) User Data.

See Section 5, “TPDUs Used by RFC-1006,” for detailed information on the TPDUs

used by RFC-1006. This information might be useful when you are looking at

trace records.

Service Primitives This section contains five tables describing the service primitives. The first three

define OSI service primitives (Transport and Network Layers) and TCP service

primitives. The last two tables show the mapping of the OSI primitives and

parameters to the TCP primitives and parameters.

OSI Transport Service Primitives

The OSI Transport Layer provides the following OSI transport service primitives to the

transport service user, as defined in ISO 8072, with the exception of a T-ATTACH,

which is a Tandem-specific primitive. Table 1-3 describes the transport service

primitives.