E.F. Johnson Company 5100 Series, Руководство по обслуживанию

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GENERAL INFORMATION
1-2
used in systems where the channel spacing is 25 kHz
or 30 kHz.
Digital - C4FM modulation is used. The voice is digi-
tized, filtered, error corrected, optionally encrypted,
and then transmitted. Operation in the Project 25 mode
is always digital, and operation in the SMARTNET/
SmartZone mode can be either analog or digital. This
mode uses a channel spacing of 12.5 kHz.
1.2.4 OPERATING PROTOCOLS
Standard 5100-series transceivers can be
programmed for any or all the following operating
protocols. The conventional analog protocol is stan-
dard and the others are optional and therefore must be
enabled by factory programming. Refer to Section 3
for more operation information.
•
APCO Project 25 (digital) conventional
•
APCO Project 25 (digital) trunked
•
SMARTNET
®
/SmartZone
®
analog or digital
•
Analog conventional
NOTE: Multi-Net operation can be programmed with
Ascend models only.
1.2.5 FULL AND LIMITED KEYPAD MODELS
Both DTMF (18-key) and limited (6-key) models
are available. The DTMF keypad version includes the
0-9, *, and # keys for making telephone calls (not
currently available), entering unit or group ID
numbers, and keypad programming.
Both models have the programmable F1-F4
option buttons and an Up/Down switch on the front
panel. In addition, both models have a push-button and
rotary switch on the top panel and three push-button
switches on the side panel that are programmable. A
menu mode can also be programmed with both models
to select functions that are also selectable by the
option buttons. Refer to Section 3 for more informa-
tion on transceiver operation.
1.2.6 SYSTEMS, CHANNELS, AND ZONES
A zone and channel are selected to place and
receive calls. The following describes the relationship
between systems, channels, and zones.
Systems
A system is a collection of channels or talk
groups belonging to the same repeater site. It defines
all the parameters and protocol information required to
access a site. Up to 16 systems of any type can be
programmed. The maximum number of channels
assignable to a system is limited to approximately 512
with the 512 channel option (or the available memory
space as described in the following information). The
512-channel option is typically standard with all
radios.
Channels
A channel selects an RF channel or talk group as
follows:
Conventional Analog Mode - A channel selects a
specific radio channel, Call Guard (CTCSS/DCS)
squelch coding, and other parameters unique to that
channel.
Conventional Project 25 Mode - A channel selects a
specific radio channel, NAC squelch coding, talk
group ID, and other parameters unique to that channel.
Trunked Project 25 Mode - A channel selects a
specific talk group, announcement group, emergency
group, and other parameters unique to that talk group.
SMARTNET/SmartZone and Project 25 Trunked
Operation -
A channel selects a specific talk group,
announcement group, emergency group, and other
parameters unique to that talk group.
As described in the preceding “Systems” descrip-
tion, a maximum of up to approximately 512 channels
can be programmed. Although it is theoretically
possible to program any combination of systems that
produces up to 512 total channels, the maximum
number is also limited by the available memory. For
example, since more memory is required to program a
SMARTNET system than a conventional system, the
total number of channels decreases as the number of
SMARTNET systems increases. The programming
software displays a bar graph which shows the amount
of available memory space that is used by the current
data. Refer to Section 4 for more information.