Cottriel.ES@Xerox.ARPA (07/31/85)
Bob, What is the exact application for your ~leased line~? re: "...I believe consist of nothing more than a pair of wires from one site, to the phone company central office, then to the other site with no switching or electronic intervention in between...." The key here is: "no switching or electronic intervention in between" You can't usually get a metallic pair outside of the serving area of the first Telco Central office. So, if you need DC continuity past this boundary, you may as well forget it. If on the other hand you will be sending tones in the range of ~300 to 3000hz, then you could order 3002 facilities, which are voice grade lines suitable for data transmission. Cost is based upon tariff mileage which may be longer or shorter than "as the crow flies" mileage. There are also "local loop" and "termination" charges involved, plus a one time installation fee. There are also 1000 series facilities that are "...unconditioned channels capable of transmitting direct current mark-space or binary signals at rates up to 150 bauds. These channels are not suitable for the transmission of alternating current tones; they are furnished for half-duplex or duplex operation on a two-point or multi-point basis." [FCC Tariff 260, ISM TTGD-2] These may or may not have DC continuity outside of the first telco office. There are many variables involved - Call me if you want to talk about it. John Cottriel 213-615-2095