| 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 |
I have a government requirement for several hundred FDDI concentrators as follows: "The Contractor shall provide a FDDI dual attachment concentrator with a minimum eight master station ports that connect to a dual ring or to another concentrator via two dual homed connections. The Contractor shall provide AB ports with single mode, multimode, and a copper based implementation of FDDI (ie, CDDI). The Contractor shall provide 2 Medium Access Control (MAC) BOOTP support, hot swappable line cards, SNMP agent, TELNET support; null, single and cual attachment; FLASH firmware, compliance with FDDI SMT Rev 7.3., Concentrator configuration via software, non-volitle memory for configuration, MIB II, and private extension support; per port traffic capability." From what I can gather so far, the DECconcentrator 500 and 900MX don't meet the requirements - they seem to be written for a Cisco WS-C1400 or something else (3COM, Synoptics, Chipcom, Cabletron??) Is there any good source of competitive information on FDDI concentrators available ? Can anyone suggest other solutions ? thanks, larry cole tech support, US Federal Sales Region etonic::cole or [email protected]
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1583.1 | NETCAD::B_CRONIN | Wed Feb 15 1995 11:23 | 6 | ||
The only thing we can offer is to talk to them about whether they
will be willing to use single MAC concentrators. We only sell
single MAC concentrators, so if that's not negotaible, the rest
is moot. I won't try to minimize the amount of software required to
add items such as telnet, but that's at least possible to add!
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| 1583.2 | Confused.. | PFSVAX::MCELWEE | Opponent of Oppression | Fri Feb 17 1995 23:02 | 3 |
What's the advantage of more than one MAC please?
Phil
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| 1583.3 | NETCAD::B_CRONIN | Mon Feb 20 1995 17:03 | 19 | ||
An FDDI network is built with two rings, referred to as the primary and
secondary rings. Each ring operates at a data rate of 100 Mbps. Some
people wanted to be able to put a total of 200 Mbps onto the rings.
(Of course, when the rings wrapped, they were back to 100 Mbps, but
some people could accept that).
Since in the normal condition the rings were independent of
each other, traffic had to be bridged or routed between the
two rings. When they wrapped, the traffic would now all be on the
same ring - very confusing.
We chose to build products that have only 1 MAC, since that was
cheaper, simpler, and was also the predominant manner in which FDDI
is used.
So, the perceived advantage is that you get 200 Mbps out of your
ring. In fact, its not that easy.
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| 1583.4 | I understand the rationele, but?? | PFSVAX::MCELWEE | Opponent of Oppression | Mon Feb 27 1995 01:22 | 7 |
Re: .3-
OK, I see. Digital does not condone using the latent 100Mbps?
Providing Full Duplex FDDI is obviously one advantage, but how do
we address the 100 vs. 200 Mbps claims?
Phil
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| 1583.5 | NETCAD::STEFANI | Welcome to the Revolution! | Mon Feb 27 1995 11:25 | 11 | |
>> Providing Full Duplex FDDI is obviously one advantage, but how do
>>we address the 100 vs. 200 Mbps claims?
1. How many dual MAC FDDI concentrators are out there?
2. How many of these are integrated in a hub that users own?
3. How many dual MAC FDDI bridges, routers, or adapters are out there?
I think the market has pretty much dictated that using both the primary
and secondary rings will be limited to a few niche vendors.
/l
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