2-3-94
                 LEASED LINE SUPPORT Zoom/modems

     While  they  aren't  designed for leased line this often works:

     To  use Zoom/modems with leased lines, they require MANUAL connect  at
the  beginning  of  a connection. The manual connect  is  by  typing  ATX1D
(originate) and ATA (receiving modem) unless the line is a ring down  line.
The  line  must be a 2-wire leased line. You also may use  a  ring-down  or
voice  2  wire leased line. This kind of line RINGs when one end  is  taken
off-hook.  Then  you  may use AA (AutoAnswer ATS0=1) or  let  the  software
answer  the  RING  on the receiving end. You Still use  the  ATX1D  on  the
originate modem. If you use a 'RING' generator on a leased line, the AA (or
software answer) will work on a non-ring-down line.
     If  using  either  ring-down line, or ring generator  the  AA  on  the
answering  modem should Blink OFF when it gets the ring, then  answer.  The
voltage must be at least 40V RMS, and the ring over 17hz.

      You  may  want  to set S10=255 so the modem will  never  hang  up  if
carrier is lost.

>>  On the V32(bis) modems do NOT use &L1 command (keep default &L0). <<

     A  LEASED  LINE normally is just an open line with NO  DIALTONE  &  no
RING,  connected at all times. A modem will not AutoAnswer if there  is  no
RING  into  the  modem.  There is a cheap  part,  which  with  a  momentary
pushbutton  & 5vdc input, will output a 5 watt RING, so should work with  a
normal leased line.

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     You  just  push the button at the same time you dial  with  the  local
modem, and the modem on the other end will AutoAnswer (ATS0=1&W). You  dial
with  ATX1D because there is NO DIALTONE and X1 tells the modem  to  ignore
dialtone.

     Cambridge  Electronics, Sommerville Mass. makes this device.  a  Micro
Module UU-BMR $33, 5-pc $29 (can be had w/ either 5vdc or 12vcd input).
Phone #  617-629-2805.  You can get the push button from Radio Shack.

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NOTE:  devices added to your phone line should be reported and approved  by
the phone company.

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                                   Don Hinds - Zoom Tech

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