| 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 |
Hi,
a customer tender asks for a 100 Mbps optical interface, but not FDDI
(he will develop his own protocol), with the following characteristics:
laser low energy
100 Mbps
1300/1550 nm.
optical budget: 20 dB
connector: FC?
Do we have an interface (PCI or ISA on Unix) to do this?
Any suggestion about external supplier?
A different question: what fiber type (monomode or multimode) are
supported by the optical modules of the DEC Hub90 (repeaters, bridges...)
thanks a lot for your help
Angelo
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1773.1 | info on fiber types | NETCAD::ROLKE | I had THREE teapots! | Tue Aug 08 1995 18:14 | 22 |
Angelo,
> a customer tender asks for a 100 Mbps optical interface, but not FDDI
> (he will develop his own protocol), with the following characteristics:
>...
> Do we have an interface (PCI or ISA on Unix) to do this?
> Any suggestion about external supplier?
It just doesn't seem fair to ask this question in the FDDI conference! ;-)
What are some of the other competing 100 Mbps technologies? What's wrong
with using FDDI? Certainly FDDI's connection and topology rules might seem
daunting but FDDI is a commodity: you buy it, plug it in and it works. And
it took several man-centuries of engineering to make it that way...
> A different question: what fiber type (monomode or multimode) are
> supported by the optical modules of the DEC Hub90 (repeaters, bridges...)
See another notes conference: NETCAD::HUB_MGNT note 1226.4
Regards,
Chuck
| |||||
| 1773.2 | Sonet? | STOWOA::PERLMUTTER | Wed Aug 09 1995 15:46 | 22 | |
The other standard in optical networking (at the physical layer) is
CCITT G.707-G.709 known in the U.S. as SONET and SDH in Europe.
This is the one of the key physical layers for ATM and Digital is
currently shipping Sonet ATM boards. This is a very flexible standard
and provides a network layer to map use synchronous services as well as
other services (like FDDI or DS0s) into Sonet payloads.
I don't dont think your user can get off the shelf components from
digital outside of the ATM program but is am pretty sure he can find
component sources for standard bus types since ATM has increased the
visability of Sonet.
Note however that Sonet has wierd speeds of operations starting at
51.84 Mbps, 155 Mbps and a scaling up to over 1 Gbps. It handles both
syncronous and isocronous modes of operation. And I believe it complies
with the physical interfaces that you mentioned
If you think that I have just spouted a lot of buzz words you would be
right. I don't know much more than this about this technology but I do
think that this might be interesting for your customer to investigate
| |||||
| 1773.3 | He's probably looking for a board with the TAXI chip | STEVMS::PETTENGILL | mulp | Mon Aug 21 1995 21:50 | 5 |
This was/is used to connect to ATM switches and to do other point to point kinds of communication. TAXI has the advantage of not being encumbered with the multiple layers of standards that FDDI has, but otherwise leverages off FDDI technology. TAXI has been around for a long time, so I'll bet that you can find TAXI boards for EISA, FB, TC, and PCI. Somewhere. But not from DEC. | |||||