Analog/Digital Operation; Operating Protocols; Systems, Channels, And Zones; Systems - E.F. Johnson Company 5100 ES Series Service Manual

1.2.2
The 5100 ES transceiver uses a Digital Signal Processor (DSP) to provide IF and audio
filtering and modulation functions. This allows operation on the various types of channels,
backward compatibility with existing equipment, and the ability to operate on various
types of radio systems.
Narrow Band Analog - FM modulation is used with a maximum deviation of 2.5 kHz.
This mode is usually used in systems with a channel spacing of 12.5 or 15 kHz.
Wideband Analog - FM modulation is used with a maximum deviation of 5 kHz. This
mode is usually used in systems where the channel spacing is 25 kHz or 30 kHz.
Digital - C4FM modulation is used. The voice is digitized, 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.
1.2.3
Standard 5100 ES transceivers can be programmed for any or all the following operating
protocols. The conventional analog protocol is standard and the others are optional and
therefore must be enabled by factory programming. Refer to "Operation" on page 3-1 for
more operation information.
• APCO Project 25 (digital) conventional
• APCO Project 25 (digital) trunked
• SMARTNET
• Analog conventional
1.2.4
A zone and channel are selected to place and receive calls. The following information
describes the relationship between systems, channels, and zones.
1.2.4.1
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.
January 2007

Analog/Digital Operation

Operating Protocols

® ®
/SmartZone analog or digital

Systems, Channels, and Zones

Systems

5100 ES Series Portable Radio Service Manual 1-3
General Information