11-11-93
                 LEASED LINE SUPPORT Zoom/modems

     Those  Zoom/modems with leased line capability require MANUAL  connect
at  the beginning of a connection unless using syncronous mode. The  manual
connect is by typing ATX1D (originate) and ATA (receiving modem, also neede
for syncronous 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 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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