1. Scope

1.1

General This part of ISO/IEC ISP 10609 is applicable to end systems concerned with operating in the Open Systems Interconnection (OSI) environment. It specifies a combination of OSI standards, which collectively provide the connection-mode Transport Service using the connection-mode Network Service.

This part of ISO/IEC ISP 10609 is applicable to the provision of the connection-mode Transport Service in end systems attached to any type of subnetwork from which the standardized connection- mode Network Service can be made available.

This part of ISO/IEC ISP 10609 specifies the definition of Profiles TB1111/TB1121. The TB1111/TB1121 are profiles in the TB group which uses Transport protocol classes 0, 2 and 4.

1.2

Position of Profiles within the Taxonomy This part of ISO/IEC ISP 10609 covers the taxonomy elements identified as ""TB, TC, TD and TE"" in the ""Directory of Profiles and ISPs"" contained in ISO/IEC/TR 10000-2. This part of ISO/IEC ISP 10609 specifies the definition of Profiles TB1111/TB1121.

These profiles may be combined with any A-profile at the A/T boundary.

1.3

Scenario Figure 1 illustrates the end system configurations to which TB1111/TB1121 profiles are applicable.

This part of ISO/IEC ISP 10609 specifies the required functions from the supporting protocol stack shown in tables 1 and 2.

This part of ISO/IEC ISP 10609 does not specify the required functions for relays.