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Chapter 8 253
Signaling Encoder and Decoder - Screens and Control Fields
AMPS-TACS, NAMPS-NTACS Encoder and Decoder
AMPS-TACS, NAMPS-NTACS Encoder and
Decoder
The following signaling formats are available for this decoder.
• AMPS = Advanced Mobile Phone Service.
• NAMPS = Narrowband Advanced Mobile Phone Service.
• TACS = Total Access Communications Systems.
• JTACS = Total Access Communications System for Japan.
• NTACS = Narrowband Total Access Communications Systems
(NTACS is an extension of JTACS).
The theory and applications of cellular telephone systems are
beyond the scope of this manual. If additional information is needed,
refer to the many technical manuals available on the subject of
cellular telephones.
Control and Voice Channel Identifiers
The AMPS/TACS and NAMPS/NTACS encoder modes use the same
forward control channel (FOCC) settings and output format. However,
the forward voice channel (FVC) information is different.
The control and voice channel fields are available in separate menus.
The Channel field is used to select the Cntl (FOCC) or Voice (FVC)
menu.
Fields available only in the forward control channel menu have (FOCC)
printed in the field title.
Fields available only in the forward voice channel menu have (FVC)
printed in the field title.
Encoder/Decoder Interaction
The AMPS-TACS/NAMPS-NTACS encoder acts like a base station
transmitter, creating forward control and voice channel information
(FOCC/FVC). The AMPS-NAMPS-TACS/NTACS decoder acts like a
base station receiver, analyzing reverse control and voice channel
signals (RECC/RVC).
The decoder uses the encoder’s Data Rate setting to specify how fast
the incoming message is being sent. Therefore, when using the decoder,
you must first specify the data rate in the encoder.