nicolas@csi.forth.gr (Nicolas Chrissakis) (11/09/90)
Dear Lan people, I have the following situation: |=========================| <-----Ethernet 802.3 |||| |||| |||| <------- 4 wires (600 meters) under a road. |||| |||| |========================| <-----Ethernet 802.3 I will like to connect the 2 Ethernet segments with these 4 wires. I can not put a repeater in the middle of the road and I want to have a 10 Mbit/sec connection. Any suggestions? I do not want to put a baseband modem at 128 Kbits/sec to have a connection. Regards Nicolas Chrissakis Office: +30 81 221171, 229302,229368,229346 Systems Analyst Fax : +30 81 229343, 229342 Foundation of Research Telex : 262389 CCI GR and Technology - Hellas E-mail: nicolas@csi.forth.gr Institute of Computer Science NICOLAS @ ARIADNE P.O.Box 1385, Heraklio, ariadne!nicolas Crete Greece 711 10
dpz@dimacs.rutgers.edu (David Paul Zimmerman) (11/09/90)
nicolas@csi.forth.gr (Nicolas Chrissakis) writes: > |=========================| <-----Ethernet 802.3 > |||| > |||| > |||| <------- 4 wires (600 meters) under a road. > |||| > |||| > |========================| <-----Ethernet 802.3 It sounds like those two Ethernets are in separate buildings. I'm not sure it is a good idea to connect these networks that way, primarily concerning the buildings' groundings, and connecting them via that 4 wire copper. You might instead consider laser or microwave Ethernet, or fiber Ethernet or FDDI. David -- David Paul Zimmerman dpz@dimacs.rutgers.edu Systems Programmer rutgers!dpz Rutgers Univ Center for Discrete Math and Theoretical Computer Science (DIMACS)
grr@cbmvax.commodore.com (George Robbins) (11/09/90)
In article <1522@ariadne.csi.forth.GR> nicolas@csi.forth.gr (Nicolas Chrissakis) writes: > |||| <------- 4 wires (600 meters) under a road. > I will like to connect the 2 Ethernet segments with these 4 wires. > I can not put a repeater in the middle of the road and I want to have a > 10 Mbit/sec connection. I'm afriad that at 6 times the nominal length, over arbitrary wire there's no chance that a twisted pair ethernet solution is going to work. The best you could do would be a cheap T1 bridge - if you can find one with a a built-in dsu/csu capbiity you might be able to use it as a short-haul modem, otherwise you'll have to go with the short-haul modem, something like a RAD ASM-40 might be able to handle 1 or 2 MBit/sec over 600 M. > I do not want to put a baseband modem at 128 Kbits/sec to have a connection. If you can get up to the 1MBit/sec range, the whole works should seem faily transparent, execpt for a heavily loaded net or on massive data transfers. > Any suggestions? Get someone to pull fibre-optic cable under the road... -- George Robbins - now working for, uucp: {uunet|pyramid|rutgers}!cbmvax!grr but no way officially representing: domain: grr@cbmvax.commodore.com Commodore, Engineering Department phone: 215-431-9349 (only by moonlite)