Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ANSI INCITS 337:2000
• Năm ban hành / Publication date: 2000
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: Information Technology – Scheduled Transfer Protocol (ST)
• Số trang / Page: 110

Phạm vi áp dụng / Scope of standard

This American National Standard specifies a connection- oriented data transfer protocol supporting flow-controlled Read and Write sequences and non-flow-controlled, persistent-memory Put, Get and FetchOp sequences. For all sequences, small control messages are used to pre-allocate buffers at the data Destination before the data movement begins, thus allowing the data to be moved immediately from the physical network into the end device's memory. The control and data messages may use different physical media or may share a single physical medium. Procedures are provided for moving data over HIPPI, Ethernet, and other media.

Specifications are included for:

- Virtual Connection setup and teardown, where the Virtual Connections have end-node-specific ULP-Port, ST-Port, Key, and ST Buffer Size values;

- control information (ST Header) flow control;

- data movement sequences: 

 flow-controlled Read and Write sequences (Transfers);

• non-flow-controlled Put, Get, and FetchOp sequences (to a persistent memory region);

- determining the size of the Block, the unit of data flow control;

- tiling the data transmission so that each data unit does not cross a receiver buffer boundary;

- detecting errors with a checksum;

- acknowledging partial Transfers so that buffers can be reused;

- providing means for resending partial Transfers for error recovery; and

- terminating Transfers in progress.

Note that some Scheduled Transfer Protocol implementations work best with lower-layer protocol (LLP) in-order delivery, which may not be available on all media.