©2000 Motorola, Inc.
Cellular Overview
Service Manual
7
Analog Cellular Signal Summary (AMPS
and NAMPS)
The diagrams on the following pages out-
line the various uses of the signals employed
in cellular systems. These signals include:
SAT (Supervisory Audio Tone) 5970 Hz, 6000
Hz, or 6030 Hz. Used in AMPS for chan-
nel reuse, muting audio (squelch), and call
continuation [typically ± 2 kHz deviation].
Digital SAT (DSAT) - One of seven codes or
vectors used in NAMPS for the same pur-
pose as SAT [± 700 Hz sub-audible NRZ
data].
Data - Transmitted at 10 kilobits/second in
AMPS and 200 bits/second in NAMPS. Data
is used for sending System Orders and Mo-
bile Identification. Do not confuse data with
the 10 kHz signaling tone. In AMPS, data is
transmitted as Manchester-encoded Fre-
quency Shift Keying (FSK), where the car-
rier is shifted high or low 8 kHz, and the trail-
ing edge transition is used to represent the
logic. In NAMPS, data is transmitted as NRZ
(Non-Return to Zero) FSK, where the carrier
is shifted high or low 700 Hz, and the fre-
quency shift itself is used to represent the
logic.
Signaling Tone (ST) - A 10 kHz tone used in
AMPS for mobile ringing, call terminations,
hand-offs, and switch-hook operation [typi-
cally ± 8 kHz deviation]. ST is always ac-
companied by SAT.
Digital ST (DST) - One of seven digital
equivalents of ST used on NAMPS channels.
The transmitted DST is always the comple-
ment of the assigned DSAT [± 700 Hz sub-
audible NRZ data].
Audio - Includes microphone audio and
DTMF [maximum ± 12 kHz deviation AMPS,
± 5 kHz deviation NAMPS]. DTMF devia-
tion should be measured on the radians scale;
use key five looking for 9 radians. Audio is
accompanied by SAT in AMPS signaling.
AMPS Deviation in kHz
AMPS Voice Channels
Control
Channels
Audio
SAT
± 2
± 4
± 6
± 8
±10
±12
±14
Signal
Tone
Data
Data
Audio
Data
SAT
SAT
Figure 5. AMPS Deviation in kHz
Analog Cellular
Summary of Contents for T2290
Page 1: ...DIGITAL WIRELESS TELEPHONE Service Manual Level 3 Release 1 TDMA T2290 T2297 ...
Page 26: ... 2000 Motorola Inc TDMA T2290 T2297 Cellular Overview 16 ...
Page 40: ...Motorola Confidential Proprietary TDMA T2290 T2297 TDMA Test Mode NAM Programming 30 ...
Page 68: ...Disassembly TDMA T2290 T2297 Keypad Removal Motorola Confidential Proprietary 58 ...