Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Transparent Conversion between Fibre Channel Standard and High Performance Parallel Interface

IP.com Disclosure Number: IPCOM000105321D
Original Publication Date: 1993-Jul-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 102K

Publishing Venue

IBM

Related People

Sachs, MW: AUTHOR

Abstract

ANSI Standards Committee X3T9.3 is developing two high speed channel standards, HIPPI and FCS. HIPPI (High Performance Parallel Interface) is a short-distance parallel switched point to point interconnection. FCS (Fibre Channel Standard) is a fiber optic serial switched point to point interconnection. There is a need to provide a means for an FCS endpoint to communicate with a HIPPI endpoint. According to the present art, a converter can be used to connect a single FCS endpoint (N_Port) to a HIPPI network or a single HIPPI endpoint to an FCS network.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 50% of the total text.

Transparent Conversion between Fibre Channel Standard and High Performance Parallel Interface

      ANSI Standards Committee X3T9.3 is developing two high speed
channel standards, HIPPI and FCS.  HIPPI (High Performance Parallel
Interface) is a short-distance parallel switched point to point
interconnection.  FCS (Fibre Channel Standard) is a fiber optic
serial switched point to point interconnection.  There is a need to
provide a means for an FCS endpoint to communicate with a HIPPI
endpoint.  According to the present art, a converter can be used to
connect a single FCS endpoint (N_Port) to a HIPPI network or a single
HIPPI endpoint to an FCS network.

The following figure illustrates this topology.

                                       ___|___|__|___
                                      |              |      _____
 ________              _______        |              |--   |HIPPI|
|        |  FCS       | con-  | HIPPI |   HIPPI      |-----|end- |
| N_Port |------------| verter|-------|   switch     |--   |point|
|________|            |_______|       |              |--   |_____|
                                      |______________|
                                          |    |   |

      According to present practice, where the converter connects an
FCS endpoint to a HIPPI network the converter appears to be a normal
FCS endpoint (N_Port) and must have an FCS address (N_Port address).
According to the FCS architecture, an FCS endpoint must include the
N_Port address of the destination in the link headers of all its data
frames.  To address a destination on the HIPPI network, the FCS
endpoint must include the N_Port address of the converter in the link
headers of the frames it sends and must also include the HIPPI
address (I_field) of the destination in the payload of the data
frames.  This requires that the FCS endpoint have explicit awareness
of the HIPPI addressing structure.  It also means that the converter
must appear to be a special upper level protocol which extracts the
I_field value from the payload of the FCS frames in the process of
building the resulting HIPPI packets.

      Simpler architecture and simpler implementations would be
possible if difference between the networks were transparent to the
endpoints.  This would enable the FCS endpoint to treat the
destinations on the HIPPI network as FCS destinations with "virtual"
N_Port addresses.  The endpoint could then put the N_Port address of
the final destination in its link headers rather than the N_Port
address of the converter.  This invention provides a means of
accomplishing the desired transparency.

      Similar considerations apply to a HIPPI endpoint addressing a
desti...