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Conference 7.286::fddi

Title:	FDDI - The Next Generation

Moderator:	NETCAD::STEFANI

Created:	Thu Apr 27 1989
Last Modified:	Thu Jun 05 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	2259
Total number of notes:	8590

255.0. "Questions about Broadcast" by ISIDRO::DEDIEGO (Fernando de Diego) Fri May 10 1991 12:17

There is a future project with requirements like Task to Task ( and other comms)
based on OSI model, writing applications in ADA language, broadcast of data to
several nodes in a FDDI & Ethernet/802.3 network. The questions are about our
capabilities to do it, when/how. Is the FDDI driver of the future XMI<->FDDI
controller programable from ADA and what is the API to do: VOTS/OSAK, DECnet/V, 
QIO, etc.?.  Are there any examples available?


Thanks
Fernando

T.R	Title	User	Personal Name	Date	Lines
255.1	FDDI QIO information	STAR::GAGNE	David Gagne - VMS/LAN Development	`Fri May 10 1991 15:02`	19
	The QIO interface to the FDDI drivers on VMS is identical to the QIO interface to the Ethernet drivers on VMS. There are a couple of new parameters/options that you can use on FDDI. But if you want your application to run on Ethernet, then you should follow the Ethernet QIO chapter (6) in the I/O User's Manual Part II. The XMI to FDDI driver is FXDRIVER (for the DEMFA device) and we have already run many Ethernet applications on it with no problems. The interface to FDDI through DECnet and VOTS/OSAK should not change from the existing interface. I also expect that since not all data link mediums have a broadcast service, these higher layer intefaces (DECnet and VOTS/OKAK) cannot supply you with a broadcast feature. The Ethernet and FDDI drivers do have broadcast capability through the QIO interface. As far as ADA goes, just use the QIO interface as you would to any other driver - if you are going to use the Ethernet/FDDI driver QIO interface. Phase V will have a new programming interface; but you will need to get information about that from the Phase V group.
255.2	QIO buffer size?	PRIMES::BLASINGAME	Craig @EKO, GSG/DCC, DTN-339-7245	`Thu May 16 1991 17:11`	10
	What will be the maximum buffer that could be transfered XMI-FDDI to XMI-FDDI using the VMS Driver? Customer will actually be devising a new hardware platform for connection of radar system to FDDI and would like to minimize I/O on receiving VAX 6xxx CPU. Also, any pointer to someone who could assist customer in devising new hardware would be appreciated. Current hardware is DR750 on CPU end with AMD boards on radar end. Since AMD is one of the producers of our chip set I would suspect that they might be interested in helping. All pointers would be greatly appreciated.
255.3	Max FDDI user transfer numbers	STAR::GAGNE	David Gagne - VMS/LAN Development	`Thu May 16 1991 17:29`	5
	Maximum is 4475 bytes assuming you use the 802 packet format with CLASS I service. The smallest maximum is 4468 bytes assuming you use Ethernet packet format (also known as translated Ethernet for FDDI) with padding ON.