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LEASED2
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1994-01-03
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50 lines
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.
##include=ringgen.tif
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.
****************************************************************************
NOTE: devices added to your phone line should be reported and approved by
the phone company.
****************************************************************************
Don Hinds - Zoom Tech
##include=c:\text\signa.tif