Browse Prior Art Database

Method for Avoiding the Explicit VCI Determination Procedure

IP.com Disclosure Number: IPCOM000106210D
Original Publication Date: 1993-Oct-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 119K

Publishing Venue

IBM

Related People

Le Boudec, JY: AUTHOR [+3]

Abstract

Disclosed for avoiding the explicit VCI determination procedure, which is required for the "Direct ATM Connectionless (DACS)" and the "Partial Connection (PC)" methods as described in [*]

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Method for Avoiding the Explicit VCI Determination Procedure

      Disclosed for avoiding the explicit VCI determination
procedure, which is required for the "Direct ATM Connectionless
(DACS)" and the "Partial Connection (PC)" methods as described in [*]

      For the connectionless data service a "Virtual Path Connection
(VPC)" with VPI = "cls" is reserved.  All connectionless traffic
exchanged between the endsystem and the network are transferred
within this dedicated VPC.

      Within this dedicated VPC, three types of channels are defined,
each identified by a two-bytes VCI-value.  A multicast channel,
identified by the reserved VCI-value "mc", is used by an encsystem to
sent multicast messages to a group of destination endsystems.  A
default channel, identified by the reserved VCI-value "*", is used by
an endsystem to send/recieve connectionless messages to/from any
individual destination.  In case of a cache miss, the endsystem sends
the connectionless message over this channel.  All the remaining
VCI-values are used to identify so-called "direct channels".  They
are end-to-end channels, i.e. they connect two endsystems.
Connectionless messages sent over a direct channel are all addressed
to the same individual destination.  The use of direct channels
requires a cache for mapping VCI-values to destination addresses in
the endsystem.

      Only one type of message is defined, named "connectionless (CL)
message", which has the following structure: CL Messgae (DCI, DA, SA,
Information).

      Where DA/SA are the destination source addresses.  The Direct
Channel Identifier (DCI) included in a CL message contains...