User's Manual

JTECH UHF Desktop Transmitter Installation and Operation Guide 320115K Page 33
Appendix D – Telephone Interconnect Specifications
Telephone Interfacing
Phone Line Interconnect – The PeopleAlert 2601 with Telephone will accept input
from end-to-end (line level) telephone circuits. Selector or trunk level input is not
possible. The phones and phone system must be capable of DTMF and provide
a Bell standard ringing voltage.
PABX Interface – The PABX (Private Automated Branch Exchange) or PBX
(Private Branch Exchange) must pass DTMF tones (touch tones), and Ringing
Voltage, for the PeopleAlert with Telephone to work. A simple test can be used
to see if DTMF tones are passed through the telephone system. Dial a phone
extension and depress any of the keys on the phone pad. If the party you called
can hear tones, then the system does pass DTMF. Because many of the newer
PBX’s are numeric systems, they may not pass DTMF. In this situation, the
customer must install a separate DTMF-capable end-to-end phone line for the
PeopleAlert 2601. Special feature phone consoles may not use DTMF signaling
and you can also use the test described above to test the phone consoles.
Key System – Some customers may not have a PBX, but may have multiple
telephone lines, which are connected to numerous phone sets with push buttons
to activate “pick up”. In this situation, a separate telephone line should be
dedicated to the PeopleAlert 2601 with Telephone and users would dial a 7-digit
phone number to access the PeopleAlert 2601.
Telephone Interconnect Description
The Desktop Transmitter Telephone Interconnect is that of a very basic ‘Line
Level’ hook-up which operates in the following manner:
• The telephone system supplies battery voltage across Tip and Ring. The
telephone system applies -48 volts on Ring and ground on Tip.
• When someone calls a PeopleAlert with Telephone, the telephone system
applies an interrupted ‘Ringing’ voltage (two seconds ring, four seconds rest)
across Tip and Ring. Ringing voltage is an approximately 105 VAC signal.
• The 2601’s telephone module detects the ringing. The encoder’s telephone
module goes off hook, energizes a relay, and puts a low impedance closure
across Tip and Ring, back to the telephone system.