eli@spdcc.COM (Steve Elias) (01/06/89)
are there other companies producing long distance, high performance ethernet bridges out there? or any users of same? i'm not talking about bridges which use phone lines or even T1... unless someone has managed to get many thousands of packets per second over such media... it takes cable or fiber to do near-full-speed bridging, as far as i know... how many packets per second can T1 bridges handle??? i'd be interested in hearing war stories or feedback about any other bridges... by long distance, i mean many miles... and by high performance, i mean something that can handle a heavy ethernet load... as you may have guessed, we have a competitive product like this. i'll leave the sales pitch to anyone interested enough to email. public feedback on any similar bridges would be appreciated. steve elias Chipcom Corp. -- Steve Elias (eli@spdcc.com) ((617 239 9406)) (((617 890 6844))) ()
haas@wasatch.UUCP (Walt Haas) (01/07/89)
In article <2369@spdcc.SPDCC.COM>, eli@spdcc.COM (Steve Elias) writes: > are there other companies producing long distance, high performance > ethernet bridges out there? or any users of same? Yes, Sytek produces an 802.4 over broadband product that works fine. > as you may have guessed, we have a competitive product like this... > public feedback on any similar bridges would be appreciated. > > steve elias > Chipcom Corp. We were hoping that Chipcom would respond to our RFP for 802.4 bridges, but they didn't submit a bid, so the contract was awarded to Sytek. Cheers -- Walt Haas haas@cs.utah.edu ...!utah-cs!haas
david@ms.uky.edu (David Herron -- One of the vertebrae) (01/07/89)
There's that micro-wave product which is being used by Boston U and Harvard
to link their ethernets. At least I think that's the two school, it's one
of them schools up thar in Boston enywey. It supposedly does full-speed
ethernet bridging and the like, but I don't remember any details. There
was an article in LAN magazine sometime in the middle of last year and
around the same time a small flurry of articles here.
--
<-- David Herron; an MMDF guy <david@ms.uky.edu>
<-- ska: David le casse\*' {rutgers,uunet}!ukma!david, david@UKMA.BITNET
<-- Now I know how Zonker felt when he graduated ...
<-- Stop! Wait! I didn't mean to!kwe@bu-cs.BU.EDU (kwe@bu-it.bu.edu (Kent W. England)) (01/08/89)
In article <10832@s.ms.uky.edu> david@ms.uky.edu (David Herron -- One of the vertebrae) writes: >There's that micro-wave product which is being used by Boston U and Harvard >to link their ethernets. At least I think that's the two school, it's one >of them schools up thar in Boston enywey. It supposedly does full-speed >ethernet bridging and the like, but I don't remember any details. There >was an article in LAN magazine sometime in the middle of last year and >around the same time a small flurry of articles here. >-- That's right it was Boston University and Harvard, but now it's Boston University, Harvard, and MIT and we have three Ethernet links up. We are using them as serial links between router interfaces. It is native Ethernet frames over microwave. Our vendor is Microwave Bypass. There is also Microwave Networks and I believe DEC still has a working relationship with M/A-Com on a similar product. This is really a repeater-like product (think of it as an Ethernet segment actually in the ether), but the question was about "bridges". Of course, you can plug bridges, repeaters and anything else you want into this Etherwave, since it looks just like a transceiver interface, so I guess it fits the bill alright. The microwave is 23 GHz, a 2 foot diameter dish, and you need an FCC license and site survey, which Microwave Bypass can do. 23 GHz will go about 8 miles in the northeast, but the Ethernet timing spec limits you to 4.3 miles to avoid undetected collisions. You may find this a limitation. There are also similar Ethernet-on-infrared products now available. These are limited to about 1 km, but you don't need a license and they are quite compact. Just the thing for a backup or a way to get across the street or highway. Kent England, Boston University Standard disclaimer: I have no affiliation with Microwave Bypass other than as a customer and input device.
ron@ron.rutgers.edu (Ron Natalie) (01/10/89)
I don't know what you mean by many miles, but Microwave Bypass among others drive Ethernet over Microwave. They were even talking about doing something other than a simple repeat so they could get extended distances. _Ron
page@swan.ulowell.edu (Bob Page) (01/11/89)
kwe@buit13.bu.edu (Kent England) wrote: > It is native Ethernet frames over microwave. Our vendor is >Microwave Bypass. There is also Microwave Networks and I believe DEC >still has a working relationship with M/A-Com on a similar product. We (ULowell) are using the DEC & M/A-Com product (DEC calls it MetroWave) to link two campuses; after about 3-4 months with it we have not had any problems. We had originally been using Chipcom-over-broadband but the distance was too far, and the local cable TV company liked to experiment with the cable space we were leasing. ..Bob -- Bob Page, U of Lowell CS Dept. page@swan.ulowell.edu ulowell!page Have five nice days.
haas@wasatch.UUCP (Walt Haas) (01/11/89)
If you read my statement that Chipcom didn't respond to our RFP for bridges and inferred that they weren't interested in our business, boyoboy were they interested. Our purchasing agent swears they were sent a copy of the request to bid, Chipcom swears they didn't get it but wanted to, and I'm in the middle. Maybe I can blame it on the post office... honestly, guys, we worked hard to make it a fair bid. Cheers -- Walt Haas haas@cs.utah.edu utah-cs!haas
eli@spdcc.COM (Steve Elias) (01/12/89)
ron@ron.rutgers.edu (Ron Natalie) writes: >I don't know what you mean by many miles, but Microwave >Bypass among others drive Ethernet over Microwave. They >were even talking about doing something other than a >simple repeat so they could get extended distances. my original posting was a tad ambiguous... by many miles, i mean 24 miles. each subnet requires one Marathon bridge and the max radius of the backbone is 12 miles from the headend... the backbone is 10 Mbit/sec single cable broadband token bus. -- Steve Elias (eli@spdcc.com) ((617 239 9406)) (((617 890 6844))) ()