| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 102.1 | PS | RIPPLE::KOPEC_ST | Seattle DNT/Sales - DTN 545-4207 | Fri Aug 10 1990 15:39 | 5 |
| the customer who I am working with is working closely with a local
telecomm company to have single mode fiber installed between the sites,
so if we can't help them somebody else will.
Thanks again, Stan
|
| 102.2 | | KONING::KONING | NI1D @FN42eq | Fri Aug 10 1990 17:25 | 9 |
| I rather doubt that "someone else will".
The total distance limit of FDDI is 200 km. So unless the fiber happens to
go by the shortest possible route, and that's the only fiber in the entire
ring, you are violating the distance limits.
If you really mean today, then what you've described is about it.
paul
|
| 102.3 | | RIPPLE::KOPEC_ST | Seattle DNT/Sales - DTN 545-4207 | Fri Aug 10 1990 20:48 | 19 |
| thanks Paul, I didn't realize that the 200 km total distance was
applicable to both multimode and single mode FDDI implementations. Since
there is no standard yet for single mode, I was hoping that single mode
implementations of FDDI would allow for both...
a) greater distances between stations/concentrators
and..
b) greater total distance
Since (b) is not going to happen, is it correct to assume that single
mode will allow (a) above?
How about FDDI to T3 bridges? Is DEC, Vitalink or one of our other
partners doing research in this area? Is the research into FDDI-T3
bridges far enough along to know whether the supported media would
include both fiber & copper?
Thanks, Stan
|
| 102.4 | some 3rd party capability | CSOA1::SEITZ | LOST-IN-SPACE | Sat Aug 11 1990 12:23 | 16 |
| There are some ways to do this now, or at least in the near future with
3rd partys. Both cisco and Wellfleet have announced FDDI and T3
connections for their Router/Bridges. This will allow connectivity
directly from FDDI to a T3 channel. I believe both products are due to
be released in the fall.
The second issue, T3 over single-mode fiber has been supplied by the
local phone companies for years.
I would caution that while these vendors will be providing the
connectivity between FDDI (100mb) and T3 (45mb), it does not appear
that their processors will be capable of actually providing such high
throughput. The last I heard from cisco, they were struggling to
achieve 15mb in this configuration.
Mike
|
| 102.5 | I have a similar single mode requirement | BOSNET::COLUMBUS | JOHN COLUMBUS | Sun Sep 30 1990 20:09 | 20 |
| I just took a look at your note on single mode FDDI. I'm working
with the Mass Bay Transit Authority (MBTA) here in Boston researching
single mode fiber over FDDI options. The MBTA has contracted with
a metropolitan fiber outfit to use the tunnels and rail lines as
the right-of-way for fiber routes. As part of this deal, the MBTA
was given 28 strands back to their operations center from a total
of 73 buildings throughout the metro Boston area spanning a total
of 600 miles.
The MBTA wants DEC to discuss single mode over FDDI, along with
the possibility of two Vax 9000's 2 miles apart connected via FDDI
Vax clustering. We are in the process of trying to put together
a non-disclosure with them and get the right engineering people
out to talk to the MBTA.
I'd like to disuss your progress with your account and share some
insight with you. I can be reached on BOSNET::COLUMBUS or Columbus@BXO.
John Columbus
NWSS Consultant
|