Specifications

9261-7974 Issue 06
ESFIRECODER - Emergency Services Firecoder
Page 44
www.multitone.com
6.45 1200 Baud Paging
Normally, all paging is done at 512 baud, however, for special applications, 1200 baud may be used to
increase throughput at the expense of coverage. If this parameter is true, 1200 baud is used for all
calls, both Mk7 and Pocsag format.
6.48 Manchester Encoding
Normally, all paging calls use NRZ format, however for special applications (normally only older Mk7
systems running at 512 baud), Manchester Encoding will be used for 512 baud Mk7 format calls if this
parameter is true.
6.49 Inversion Control
The polarity of the various signals used to drive a transmitter and receiver are preset for the most
common configuration. However, individual control of each signal can be enabled as required.
Control Line Value (hex) Default
Data Output 0001 Active-Low
Transmitter A Key 0002 Active-Low
Transmitter B Key 0004 Active-Low
Voice Mode Key 0008 Active-Low
Transmitter Alarms 0010 Active-Low
Carrier Detect 0100 Active-Low
The value of this parameter is the hexadecimal sum of each control line that needs inversion.
The Data Output is normally High to select the higher frequency and Low to select the lower
frequency for a paging transmission. POCSAG transmissions are normally sent with inverted data;
however, this inversion is automatically taken care of by the alerter and should not be specifically
included in the Data Output setting.
The Voice Mode Key is only used for speech paging, and selects digital or analogue mode on a
transmitter. The output is active when the transmitter is required to transmit analogue (voice) signals.
When using a PSL Transmitter, the only control line that should be inverted is Transmitter Alarms,
so this parameter should be set to 0010.
Note that if Decode Mode is enabled, the transmitter will be inhibited whenever the Carrier Detect
input is active. However, if nothing is connected to this input, it will read as high, therefore it will always
be inactive with the default Carrier Detect polarity settings.
6.50 Wide Area Table
This table is used to specify the name, addresses and zones for all the hilltop sites used for a Wide
Area paging scheme. Leave any unused entries set to 000:0000:00