| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1867.1 | | NETCAD::STEFANI | Machines to humanize | Thu Nov 16 1995 09:22 | 15 |
| I don't know of a whitepaper on FDX, but there's some information about
our FDDI adapters in the APG WWW page:
http://ftp.digital.com/pub/DEC/adapters/home.html
Digital also licenses FDX to a number of 3rd party companies, so you
can probably talk to the corporate licensing office to get the "public"
information on FDX.
Most (if not all) of the FDDI adapters support FDX, however, there are
typically SW switches that need to be thrown to enable it. If you have
a particular adapter/OS configuration in mind, please post it and we
might be able to address it.
/l
|
| 1867.2 | Thanks and need help | BEJVC::TYRONELIN | | Thu Nov 16 1995 20:43 | 16 |
| Hi,
Thank you for quickly answer.
I just want to know how our FDDI NICs physically connect to
GIGAswitch/FDDI. The customer don't believe we can use SAS FDDI NICs to
implement Full Duplex FDDI. They think it must be DAS.
Also I can't access WWW,because in PRC we have no TCP/IP service.
But we can only copy from our VMS networks.
Can you help me post some FDDI info or tell me where I can get them
from our VMS networks?
Thanks
Tyrone
|
| 1867.3 | | NETCAD::STEFANI | Machines to humanize | Thu Nov 16 1995 23:19 | 8 |
| >>I just want to know how our FDDI NICs physically connect to
>>GIGAswitch/FDDI. The customer don't believe we can use SAS FDDI NICs to
>>implement Full Duplex FDDI. They think it must be DAS.
That's incorrect. You can connect both SAS and DAS adapters directly
to the GIGAswitch and use FDX.
/l
|
| 1867.4 | thanks | BEJVC::TYRONELIN | | Sun Nov 19 1995 21:52 | 9 |
| Hi,
Yes, I see it in FDDI NICs brochure. But I can't explain it,so I need
the whitepaper.
Thanks,
Tyrone
|
| 1867.5 | FYI GIGAswitch/FDDI FDX enabled by default | SCHOOL::RLEBLANC | | Mon Nov 20 1995 09:18 | 6 |
|
Also GIGAswitch/FDDI has Full Duplex enabled by default.
Cheers,
Rene'
|
| 1867.6 | FDDI EISA NICs white paper on NPB web page..... | NETCAD::BATTERSBY | | Mon Nov 20 1995 09:29 | 6 |
| There's a white paper of possible relevant interest at our NPB web page.
From our internal side of the firewall it's at;
http:npbww2.hpn.lkg.dec.com/npb/html/white-papers.html
It's available in postscript form and is 16 pages long.
Bob
|
| 1867.7 | A Layman's Description | JUMP4::JOY | Perception is reality | Tue Nov 21 1995 13:12 | 22 |
| This is a brief explanation (in layman's terms) of how FFDX works. The
customer may be confused because he may think you need to cables to
support something in full duplex mode. Each FDDI cable, whether it is
SAS or DAS, has 2 fibres in it...one for transmit and one for receive.
The ANSI FDDI MAC standard requires all MACs to be able to operate in
full duplex mode (e.g. in a normal ring, a station could be still be
receiving a long packet while it is repeating or transmitting it back out
on to the ring). This happens whether the station is connected via a
DAS connection to the dual-ring (or GIGAswitch) or via a SAS connection to
a concentrator (or GIGAswitch). FFDX capitalizes on this built-in
capability by sending special messages during the hand-shaking when a
station is joining a ring to indicated whether or not it understands
FFDX and that it is in a point-to-point configuration. If everything is
set up to use FFDX, then the stations not bother with a token and use
full duplex, otherwise they will happily fall in to normal token-passing
configuration.
I hope this helps. The whitepaper will give more details.
Regards,
Debbie
|