Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!wuarchive!udel!haven.umd.edu!mimsy!dftsrv!nssdcb.gsfc.nasa.gov!lanmaint From: lanmaint@nssdcb.gsfc.nasa.gov (Dave Yoest) Newsgroups: comp.protocols.tcp-ip.ibmpc Subject: Re: broadband adapters Message-ID: <5320@dftsrv.gsfc.nasa.gov> Date: 14 May 91 14:45:58 GMT References: Sender: news@dftsrv.gsfc.nasa.gov Reply-To: lanmaint@nssdcb.gsfc.nasa.gov Organization: NASA - Goddard Space Flight Center Lines: 63 News-Software: VAX/VMS VNEWS 1.3-4 In article , MARC@unb.CA writes... >On Tue, 14 May 91 01:29:56 ADT Frances Selkirk writes: > >> >> IBM used to sell a broadband "PCNet" card. You might have to >> experiment to find out what you could run over it, though. I heard, >> once, that someone had managed to run PC/TCP over it, with some IBM >> driver, but we've never tried it. Maybe IBM can tell you more. >> >IBM still sells PCNet. PC/TCP for Token-Ring runs just fine over >it. It also works with most packages which support packet drivers like >CUTCP, KA9Q, NCSA. Also, MD-DOS/IP from University of Maryland supports >PCNet cards. > >marc >------ > NOTE!!!!!! Broadband is NOT ETHERNET. Ethernet is a standard. Broadband is a physical transport. The original requester was somewhat vague in his first request, but later clarified that he needs a MAP compatabile product. SO THE IBM CARD WILL NOT WORK!!!!. On broadband there are many details that must be correct. The modulation scheme (AM,FM,QPSK,BPSK) must be the same, the "scrambling algorithim" (QPSK) must be the same. The TX/RX frequencies must be the same, the bandwidth of the service channel must be the same (6,12 or 18 MHZ). If you are implementing a new system then you have more leeway, but on an existing system everything must match! You can't expect two different broadband data transport channels to be compatible any more then you would expect your Television to be compatible with your celluar phone. Both use RF, but that's where the similarities end. The original requestor stated that the existing system was MAP, so he needs to look ONLY at MAP compliant products. (MAP is IEEE 802.4) If he/she is willing to look at a new "data channel" I would suggest 802.3 10BROAD36, but even then its at $500/port IF you need 8 ports otherwise it's more like 2K/port. Also with 10BROAD36 you can only go 3600 meters "round trip" (to the headend and back) Fairchild and Chipcom both sell 10BROAD36 equipment and I know Chipcom also sells MAP stuff, Fairchild may also sell MAP now. Dave Yoest LAN Section Supervisor (Mr. Broadband) NASA/Goddard Space Flight Center Greenbelt, Md. 20771 DYOEST@128.183.43.16 DYOEST@zaphod.gsfc.nasa.gov