(or RS-232) port of a modem or to another computer.
When used with a modem, the CP-220A can send the data
it processes via the modem to a remote location (similarly
equipped with a modem), where it can be viewed, printed,
and/or stored.
NOTE: The use of a modem in this regard is beyond the
scope of this manual. Inquiries about such
applications should be made to FBI's Technical
Support Department by calling (800) 645-7492.
The cable used with such applications is also known as a
serial
cable and connects the CP-220A's DCE port to the
corresponding port on the modem (or computer). The end of
this cable at the CP-220A is a 25-pin "DB"-type connector;
as with the DTE cable mentioned earlier, its other end will
vary according to the type of serial port provided by the
modem (or computer). Once again, contact FBI for help in
cabling either of these ports to the corresponding
equipment.
AUX. 1 / AUX. 2
The AUX. 1 and AUX. 2 ports are used in conjunction with
a REC-10 Line Card, which, when installed in the receiver,
enables the CP-220A to receive and process signals from
Derived Channel
equipment in use in various locales
throughout the country.
Derived Channel
technology
provides telephone system supervision so that, along with
alarms and system troubles, telephone service outages due
to vandalism, accidents, or weather conditions can be
reported to the proper Central Station.
The REC-10 Line Card is designed to process such
information using Versus Technologies'
Base 10
format.
Telephone Lines
The CP-220A has the capacity to handle simultaneous
incoming calls from up to 8 telephone lines. As stated on
page 1-5, this requires the use of up to eight Line Cards,
each of which corresponds to one of the eight telephone line
connections on the CP-220A's rear panel.
FIGURE 1-8
CP-220A Central Station Receiver
Section 1: Getting Acquainted Page 1-15
Hook-Up and Installation Manual
The 8 pairs of TIP and RING terminals
marked 1 through 8 accept up to eight
telephone lines and correspond to the
eight available Line Card slots within
the CP-220A. Each incoming
telephone line consists of two wires
designated as the "TIP" and "RING,"
which reflect their polarity. The normal
non-ringing, "on-hook" voltage
produced by such pairs is typically
between 48 and 55 volts DC, with the
positive conductor designated as "TIP"
and the negative conductor
designated as "RING." This
nomenclature dates back to the time
when switchboard operators used
phone plugs with "tip" and "ring"
conductors to make manual telephone
connections between calling parties.
While such methods are no longer is
use, the "tip" and "ring" designations
have remained.