49 lines
2.4 KiB
HTML
49 lines
2.4 KiB
HTML
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<TITLE> Modem-HOWTO: Appendix F: Connecting 2 Modems Directly Back-to-Back (Leased Lines).</TITLE>
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<A HREF="Modem-HOWTO.html#toc26">Contents</A>
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<H2><A NAME="s26">26.</A> <A HREF="Modem-HOWTO.html#toc26">Appendix F: Connecting 2 Modems Directly Back-to-Back (Leased Lines).</A></H2>
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<P>While modems are designed to be connected to telephone lines which
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have dial tones and voltages on the line, it's claimed that most
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modems will communicate when just connected to each other back-to-back
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via a telephone cord. To get this working, type ATD for one modem to
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dial and ATA for the other modem to answer (or set it for auto
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answer). Since there will be no dialtone, you may need to set ATX (or
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whatever) to blind dial (force it to dial without a dialtone). If ATD
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doesn't work because of no phone number, you could try ATD0 to send a
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0.</P>
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<P>If the above doesn't work, you could make a simple power supply to
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emulate a telephone line. See
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<A HREF="http://www.jagshouse.com/modem.html">Connecting two computers using their modems, without a telephone line</A>. </P>
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<P>A line without a source of voltage is sometimes called a "dry line"
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and some modems exist which are designed to work on such lines (or
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which can be configured to work on such lines). If you connect one of
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these special modems to a line with voltage on it, it may destroy the
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modem.</P>
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<P>A leased line is one which is usually leased from the telephone
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company. The end points of the line are under the control of the user
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who may connect a modem at each end of the line. Leased lines may or
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may not have a voltage supply on them. See the mini-howto:
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Leased-Line which covers leased lines where there is neither voltage
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nor dialtone on the line. One type of leased line used two pairs of
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wires (one for each direction) using V.29 modulation at 9600 baud.
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Some brands of leased line modems are incompatible with other brands.</P>
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