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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

1330.0. "DB900MX and Full Duplex" by DPDMAI::DAVIES (Mark, SCA Area Network Consultant) Tue May 03 1994 13:51

    
    A simple question, I hope.
    
    1. Does the DECbridge 900MX support Digital Full Duplex mode on the
       FDDI ports.
    
    Thanks,
    
    Mark
    
    
    ** Cross-posted in the HUB_MGMT conference **

T.R	Title	User	Personal Name	Date	Lines
1330.1	Yes and no.	CGOS01::DMARLOWE	Have you been HUBbed lately?	`Tue May 03 1994 16:56`	5
	Yup but only if it is connected to 1 device and it supports FDX. However a GIGAswitch line card connected to 2 DB900MX's as a ring will not operate in FDX mode. dave
1330.2		KONING::KONING	Paul Koning, B-16504	`Tue May 03 1994 18:07`	5
	Also note that the max data rate out of the box is 60 Mb/s (6 Ethernet ports). So full duplex may give you a very small latency benefit, but it cannot give you a throughput benefit. paul
1330.3	Thanks.	DPDMAI::DAVIES	Mark, SCA Area Network Consultant	`Thu May 05 1994 08:38`	8
	re: .1 Thanks. re: .2 Good point. Regards, Mark
1330.4	no working in first ship	QUIVER::PARISEAU	Luc Pariseau	`Thu May 05 1994 10:51`	9
	FDX isn't working in the DB900MX. This will be stated in the release notes. This is a firmware bug and we hope to fix this in the 45 day update. But as Paul mentioned, this feature is of very little use in this product. Luc
1330.5		35356::RABAHY	dtn 471-5160, outside 1-810-347-5160	`Thu Nov 30 1995 08:40`	3
	re .2: Surely this is a confusion with the 900EF.
1330.6	No.	CGOS01::DMARLOWE	Have you been HUBbed lately?	`Fri Dec 01 1995 01:06`	5
	DB 900MX = DS 900EF However the DS 900EE is a different animal. dave
1330.7		35356::RABAHY	dtn 471-5160, outside 1-810-347-5160	`Fri Dec 01 1995 08:39`	8
	Hello? Are we talkin' about the DECconcentrator 900MX FDDI Concentrator? Part number DEF6X-MA? This is absolutely not the same thing as the DECswitch 900EF - 7-port Ethernet to FDDI Switch, part number DEFBA-MA. Ah! I found it. The DECswitch 900EF was formly called the DECbridge 900MX. The name was changed in the Sep-1994 time frame. Tricky stuff. I shall adjust my search.