Product manual

Introduction
14 025-9158L
In addition, the wire lines must have no AC power supply or DC voltage, such as battery
voltage on a dial-up line, attached to them. A leased line (not dial-up) is a good example
of the type of line required. A “star” network configuration is recommended where the
wire line from each station transponder (Model 6) terminates at the dispatch center
(Model 26).
The signal amplitudes of all lines must be held consistent end-to-end (station-to-dispatch)
and they must be bridged together at the dispatch center. This is done with line bridging
equipment obtained as a service from the phone company or with third party line bridging
devices.
Figure 3: Typical Wire line Interface to Model 26
Central Office
or
Distribution
Bridge
J14 J13
Model 26
9 - AUD+ 10 - AUD-
2-W RX/TX
3 - AUD+ 4 - AUD-
4-W R
X
TX
RX
NOTE: A 4-wire interface is shown here; however,
a 2-wire interface can also be supported.
Note
The use of Model 6 and Model 26 equipment for data
transmission with a trunked or repeated system raises a number
of technical issues that are typically not encountered with wire
line or non-repeated conventional radio systems. In general,
trunked and repeated radio systems introduce longer delays on
the initial transmission of an alert than a non-repeated
conventional radio. Additionally, the type, mode, and
configuration of the trunked or repeated system can significantly
impact overall fire alerting system performance, particularly with
respect to multi-station alerting speed. If you are considering a
Model 6/26 installation in which FFSK data is to be transmitted
over a trunked or repeated radio channel, please contact Zetron
Product Support as early in the planning cycle as possible.