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Operation Level Protocols for the Fiber Channel Standard

IP.com Disclosure Number: IPCOM000105284D
Original Publication Date: 1993-Jul-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 8 page(s) / 240K

Publishing Venue

IBM

Related People

Carlson, BA: AUTHOR [+4]

Abstract

Describe is a transport protocol, suitable to a variety of device class-specific command sets, for the proposed ANSI X3T9.3 Fiber Channel Standard (FCS). This transport protocol is independent of any specific device command set so that multiple command sets may be conveyed using a single FCS channel implementation.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 16% of the total text.

Operation Level Protocols for the Fiber Channel Standard

      Describe is a transport protocol, suitable to a variety of
device class-specific command sets, for the proposed ANSI X3T9.3
Fiber Channel Standard (FCS).  This transport protocol is independent
of any specific device command set so that multiple command sets may
be conveyed using a single FCS channel implementation.

      FCS defines a transmission architecture by which serial,
fiber-optic or copper media may be used to convey device or
application command set information -- such as that defined by the
IPI-3 and SCSI peripheral standards as well as datagram protocols
such as Internet Protocol -- between computer systems and between
computer central processing elements and their I/O devices.  The
architecture is specified in the FC-Physical (FC-PH) draft standard.
The FC-PH standard makes reference to layers above the FC-Physical
components, that use the transmission mechanisms defined in the FC-PH
standard.  In particular, the FC-PH standard references an "FC-4"
layer, which is a transport protocol by which command set information
is conveyed on the Fiber Channel link, using the mechanisms defined
in FC-PH.

      Described is a set of primitives which may be used by the FC-4
layers which support multiple command sets.  The objectives are (1)
to define a simple transport protocol for command set information
that makes efficient use of the underlying FC-PH mechanisms and (2)
to define this transport protocol in a manner that is independent of
any specific command set.  This enables multiple command sets to use
this same transport protocol; a single FCS implementation may then be
used to convey multiple command sets.

This solution is composed of these fundamental elements:

Frame Class Definitions:  This element consists of specific frame
types and information category definitions applied to the FC-PH frame
definitions.  These frame types are the transport protocol vehicles
by which the device command set information is then transported on
the link.

Basic Transport Protocol:  This element consists of the protocols by
which the frame definitions in element 1 are combined on the FCS link
to transport the device command set information.  These protocols
build on the basic protocols defined by FC-PH.

Deferred Request Protocol: This element defines an alternate protocol
by which the Request class of command set information may be
transported using a combination of two elements from within the Basic
Transport Protocol.

      The Frame Classes define a mapping of device command set
information into the FC-PH basic frame types and data categories.
FC-PH defines three frame types:  DEVICE_DATA, LINK_DATA, and
LINK_CONTROL.  The protocol makes use of both the DEVICE_DATA and the
LINK_DATA frame types to compose command set information for
transport on the FCS link.  A particular value of the
INFORMATION_CATEGORY field in the FC-PH frame header identifies each
fra...