Codan 2110 series User Manual

The Network List
Manpack Transceiver 2110 series Reference Manual 147
Nominal Preamble
The Nominal Preamble setting applies to Codan Selcall, Open Selcall, and ALE/CALM
networks only. The nominal preamble is the length of the preamble signal sent by the
transceiver when you make a call. This is the signal for which other transceivers scan in
order to detect your call.
The nominal preamble should be set to no less than the number of channels in the
network multiplied by the call detect time (see page 145, Call Detect Time and Table 24).
If you set the Nominal Preamble setting to <default>, the transceiver calculates the
length of preamble at the time of the call, based upon the number of channels in the
network (see Table 25).
If you are calling a station that uses identical network information, the preamble of the
initiating station matches the detection requirements of the receiving station.
Table 24: Nominal preamble times calculated from call detect time
Call system Default call detect time
on each channel
(s)
(from Table 23)
Nominal preamble time calculated and
entered by system administrator for
10 channels in a network
(s)
Codan Selcall 0.3 3
Open Selcall 0.3 3
ALE/CALM 0.12 1.2
Table 25: Default nominal preamble times
Call system Default nominal
preamble time
on each channel
(s)
Nominal preamble time calculated
automatically by transceiver for
10 channels in a network
(s)
Codan Selcall 0.6 6
Open Selcall 0.6 6
ALE/CALM 0.8 8
CAUTION
If the nominal preamble for an ALE/CALM network is set to <default>
and a channel is manually selected for the call, no preamble is sent when
the call is made.
If you intend to manually select channels to call scanning stations, then a
non-default nominal preamble should be set.

Codan 2110 series Specifications

General

Brand	Codan
Model	2110 series
Category	Transceiver
Language	English