P1394 Mail Archive: RE: P1394> Last Call for Proposals

P1394 Mail Archive: RE: P1394> Last Call for Proposals

RE: P1394> Last Call for Proposals

Nagasaka Fumio (Nagasaka.Fumio@exc.epson.co.jp)
Thu, 17 Jun 1999 12:52:01 +0900

Hi,

I would like to suggest to add a topic for connection-less services
originally
proposed by Brian Batchelder.

Connection-less services over SBP-2 from an initiator to a target seems to
be easier to design.

1.1.
A send_to_I_2_T service requires four transaction listed below;
[ I ] invokes Login >>> [ T ] replies Login response
[ I ] invokes normal data session >>> [ T ] consumes requests
[ I ] receives status <<< [ T ] replies status
[ I ] invokes Logout >>> [ T ] accepts Logout

1.2.
A receive_from_I_2_T service requires four transaction listed below;
[ I ] invokes Login >>> [ T ] replies Login response
[ I ] consumes request <<< [ T ] invokes normal data session
[ I ] receives status <<< [ T ] replies status
[ I ] invokes Logout >>> [ T ] accepts Logout

However any service from the target to the initiator looks more difficult.

2.1.
A send_to_T_2_I service requires four transaction listed below;
[ T ] writes a 1394 bus level command to specific register of [ I ]
[ T ] replies Login status <<< [ I ] invokes Login
[ T ] invokes normal data session >>> [ I ] consumes request
[ T ] receive status session <<< [ I ] send transaction status
utilizing ORB
[ T ] replies status for the ORB >>> [ I ] receive status
[ T ] accept Logout <<< [ I ] invokes Logout

2.2.
A receive_from_T_2_I service requires four transaction listed below;
[ T ] writes a 1394 bus level command to specific register of [ I ]
[ T ] replies Login status <<< [ I ] invokes Login
[ T ] consume request <<< [ I ] invokes normal data session
[ T ] replies status >>> [ I ] receive status
[ T ] accept Logout <<< [ I ] invokes Logout

As conclusion, I hardly image connection-less service from the target
to the initiator without some assistance of bus level transaction from
the target side, to solicit the initiator to make login.

This issue is quite old issue which was remarked as LOGIN SOLICIT
REGISTER. Does anyone have other idea to solve connection-less
service from the target to the initiator?

Thank you,

---
Fumio Nagasaka / Epson

-----Original Message----- From: Gregory LeClair [SMTP:gleclair@agentz.com] Sent: Friday, May 28, 1999 8:19 AM To: '1394 PWG' Subject: P1394> Last Call for Proposals

The 1394 Printer Working Group is announcing a Last Call for proposals regarding the 1394 PWG Transport Specification. The cutoff date for proposals is the July meeting in Copenhagen (July 5th and 6th).

Proposals must be posted two weeks before the meeting.

Regards, Greg LeClair 1394 PWG Chair greg@erc.epson.com