RTS CS9500, User Manual

Page: 76 / 95

I
INTRODUCTION
GENERAL
The “Super” Auto-Answer board
is a plug-in PCB module for the Telos
One which provides reliable auto-answer and disconnect as well as other
*Remote control for drop
and
auto functions
Status indicators for off-hook condition and auto mode
Open collector outputs from an integral decoder
Selectable answer
on
first ring or after three rings
Disconnect on drop or reversal of talk battery (CPC)
Disconnect on dial tone detection (selectable
Auto mode enabled by remote button or dip switch position
.
Since the unit’s operation is controlled by a microprocessor, the
functionality may be changed by reprogramming the EPROM-based processor.
For instance, future versions may be configured with an I
2
C serial bus
interconnect, so that multiple
u n i t s
could communicate with a master
controller. The software-based control logic permits configuration for
operation on non-standard (or non-USA) phone lines as well.
ANSWERING FUNCTION
The auto-answer board responds to the standard USA ringing signal of
VAC
at
20 Hz. The system is protected from the false detection sometimes
caused by dial-pulses on adjacent
lines,
or other causes, by a software function
which counts AC cycles and integrates them over time.
DISCONNECT FUNCTION
Disconnect may result from any of the following:
Loopcurrent interruption
Loopcurrent reversal
Detection of dial tone (selectable)
occurs on most telco lines when the party
hangs up. It is sometimes referred to as CPC, or Party since
the party controls your equipment when he hangs up. The CPC
Telos ONE plus ONE SUPER AUTO ANSWER BOARD