Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!ll-xn!mit-eddie!bu-cs!kwe From: kwe@bu-cs.BU.EDU (kwe@buit1.bu.edu (Kent W. England)) Newsgroups: comp.dcom.lans Subject: Re: "Remote" Ethernets? Message-ID: <7028@bu-cs.BU.EDU> Date: Tue, 28-Apr-87 12:49:40 EDT Article-I.D.: bu-cs.7028 Posted: Tue Apr 28 12:49:40 1987 Date-Received: Thu, 30-Apr-87 00:49:49 EDT References: <7381@mordor.s1.gov> Reply-To: kwe@buit13.UUCP (Kent England) Organization: Boston Univ. Information Tech. Dept. Lines: 49 Summary: 10Mbps Ethernet over microwave In article <7381@mordor.s1.gov> kiessig@mordor.s1.gov (Rick Kiessig) writes: >Has anyone heard of a device which might be used to allow two >remote ethernets to talk to one another? About all I can think >of is using serial lines. Is there anything better? The LANs >are about 50 miles apart, separated by hills. Thanks, > Has anyone ever heard of Ethernet over microwave directly at 10Mbps instead of via telco standard T-1? Well, it's here. There are currently three vendors in the field, although I read recently that DEC is coming out with product (I think with Vitalink). The idea is to present an equivalent transceiver interface to a bridge or router and then interface to standard microwave gear maintaining Ethernet signaling. You do the same thing on the other end. The microwave link is the equivalent of a separate Ethernet segment (required because of timing considerations which prevent collision enforcement across the microwave link). You can use repeaters, bridges, routers, or hosts as the system interface on each end. You cannot plug directly onto the Ethernet as with a local repeater. Following is a list of the three vendors I have discovered: Microwave Bypass, Kendall Square, Cambridge, MA 617-494-8700 LAN Connection, Lexington, MA Microwave Networks, Houston, TX If you are interested in further information, contact the vendors or send me mail and I will give you further information. Please note that I have no vested interest in these vendors or their products and that this message in not an endorsement or a solicitation for commercial gain. The cost of Ethernet over microwave is equivalent to the cost of T-1. You can still mux T-1 over the link with the Ethernet so you can also link your PBXs on the same path. Of course, the phone company does not support this service. You must own the entire route yourself, which may be a problem at 50 miles. Also note that this is 23 GHz service. This is better and easier to get for short-haul. I'm not sure about 50 miles, though. -- -------------------------------------------- | Kent W. England | | Network & Systems Engineering Group | | Boston University | | Information Technology | | 111 Cummington Street | | Boston, MA 02215 | | (617) 353-2780 | | kwe@buit1.bu.edu internet | | itkwe@bostonu BITNET | --------------------------------------------