Anpois.641
net.lan
utcsrgv!utzoo!decvax!duke!harpo!npois!srk
Wed Mar 31 14:09:58 1982
Service Specification
I am a member of the IEEE project 802 High Level Interface
subcommittee (HILI). One of our concerns is a specification
of the service provided by the link layer to the network
layer. Our model of interface interaction is based on
primitives. These are discrete, instantaneous interface
events which convey the information required in order to
provide a particular service. This is the same as the model
that ISO uses in their service specifications. However, we
differ from ISO in several important ways, and I would like
to solicit comments from the newsgroup about them.
The ISO (ISO/TC 97/SC 16 N697) transport service
specification uses the "four arrow model" of service
primitive interaction. For example, the user layer passes a
"CONNECT.request" primitive to the serving layer to request
that a connection be set up. The serving layer then passes
an "CONNECT.indication" primitive to the remote user layer
to indicate the connection attempt. The remote user layer
evaluates this and then passes a "CONNECT.response"
primitive to the serving layer to accept or deny the
connection. The serving then passes a "CONNECT.confirm"
primitive to the original user layer to convey the results
of the connection attempt.
local | serving | remote
user layer | layer | user layer
| |
--------->| |
request | |
| |------------>
| | indication
| |
| |<------------ (THE BUT --------- SAME . SINCE CONNECT.INDICATION A NAME COMMITTEE FOR CONNECT.RESPONSE NOT PRIMITIVE <---------| PURPOSE OF | THINK USER USES OR LAYER, LAYER. CONVEY WITH BETTER REMOTE AN AS PEER. THREE ARROW MODEL LAYER SERVING PASSED CONNECT.REQUEST WAS ONE) PASSES AND THE WHETHER ABOVE. UNFORTUNATE ORIGINAL COULDN'T TO HOWEVER, INDICATION RESPONSE EXAMPLE, ARE SENT THUS CONFIRM WE ISO CONFLICTS PRIMITIVE, ITS IS IT AFTER HILI LOCAL>| |
request | |
| |------------>
| | indication
<---------| PROTOCOL. 07753 SHOULD MORE BECAUSE LABS A COMMITTEE FOR NEPTUNE, SET CONNECTION NOT AND/OR PURPOSE WISHES OF | ON CONNECTION. 1. USER OR DISCONNECT LAYER. OTHERWISE WITH NOT. BELL 2. APPROPRIATE REMOTE ME: AN LAYERS FOUR ARROW MODEL LAYER SERVING 922-7276 REJECTION COMMENTS BE THAT AND TWO REJECT LAYERS. THE N.J. WHETHER DISCUSS KLEIMAN SO NET DOES PEER FEELS DO IHNSS!NPOIS!SRK@BERKELEY INDEPENDENT, TO HAVE BETWEEN ARROW BUSINESS MODEL </PRE WAIT INDICATION THATS UP RESPONSE BECAUSE: ACCEPTED DATA SENT ACTUALLY PEOPLE PDU PIPE ACCEPTANCE PROTOCOL THREE PRIMITIVE. EXAMPLE IF DEPEND MAKES STEVEN IN RESPOND IS IT (201) SAY FINE, COMMUNICATION THIS WANT INTERACTION HILI BOTTOMS>
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<BR> Bruce Jones, Henry Spencer, David Wiseman.</EM>
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Bruce Jones, Henry Spencer, David Wiseman.
