User's Manual

SmartAlert 8214/8205 Programming/Installation Guide 320124E Page 16

• The telephone system then detects current flowing from its source of battery,

through the SmartAlert transmitter with telephone's loop closure, and back to

the telephone system. The current flow energizes relays in the telephone

system, which connect bi-directional audio lines through Tip and Ring to the

SmartAlert transmitter with telephone.

• Once connected, the SmartAlert transmitter with telephone prompts the caller

to enter a pager number. The caller must enter this number via a true DTMF

tone type telephone. The DTMF tones must be at least 50 msec in duration

with a 50 msec pause between digits. Numbers entered via Rotary dial, or

Digital phone systems are not recognized by the SmartAlert transmitter with

telephone.

• Termination of the call can be accomplished in three different ways:

1) The calling party hangs up their telephone before the SmartAlert

transmitter with telephone times out. This terminates the call at the

telephone end, but not at the encoder’s end. The disconnect created by

the caller hanging up its phone never makes it through the connection

between the telephone system and the SmartAlert transmitter with

telephone. To overcome this loss of a disconnect signal the encoder uses

an ‘inactivity timer’ which will time out and terminate the call, in the

encoder, after a loss of audio on Tip and Ring for approximately four

seconds.

2) The SmartAlert transmitter with telephone times out before the calling part

hangs up the telephone; this terminates the call at the encoders end.

3) The calling party enters the correct string of digits described in the section

‘Paging a Single Pager Using the Telephone Interconnect’. When the last

(#) pound key is pressed the page is sent and the call is terminated.

Appendix B - Detailed Technical Specifications

SmartAlert Model 8214/8205Transmitter

Item Specification

Operating voltage 13.8 volts 1.7 amp external wall mount power supply

Power Output 0.5 - 2 watts (Factory set; default is 2W)

Modulation FSK 512 BPS

Protocol POCSAG

Antenna port 50 ohm BNC with Whip Antenna and rotating base

Mounting Horizontal for Base Mounting/ Vertical for wall mount

Data Format 7 digit extended [recommended]

Operating frequency UHF synthesized 450 MHz-470 MHz

Temperature Stability -30

C to +50

C better than 5 ppm

Size 13.3” L (338 mm) x 6.5" H (165 mm) x 2.37 "T (60 mm)

Weight 4.3 lbs. (625 g)