CM1481 Datasheet, PDF (3/24 Pages) ON Semiconductor – 2-Channel EMI Filter with ESD Protection for Headsets/Speakers

Brief Introduction to The CM1481
The CM1481 is a compact 5- or 6-Tone CCIR, EEA
and ZVEI selcall module with individual address
encoding, non-predictive all-tone decoding,
transponding and full, all-system GROUP Call and ANI
capabilities.
In addition to normal selcall facilities, the CM1481
offers, as standard, a range of over-air control facilities
to allow a base-station additional control when working
with remote units.
These added facilities are:
‘Stun’ and ‘Release’ - To allow the controller to
completely ‘freeze’ all module and parent radio audio
functions rendering it inoperative until ‘Released’. This
to counter theft, air misuse/abuse or non-payment of
fees.
‘Re-Configuration’ - To change module addresses
and modes via an over-air command. This to allow
unit participation in other user groups.
‘Stun’, ‘Release’ and ‘Re-Configuration’ operations
are carried out using a secure authentication protocol
to prevent accidental or illegal transactions.
The unit may be muted by the base.
Under the control of its on-board µController,
operating from instructions written to it by a simple
menu-driven configuration operation from a basic 'PC'
type computer, the CM1481 can completely control
the workings of the radio's Rx and Tx audio
processes.
After Configuration the only operator inputs
required are Microphone/Handset, Volume and Selcall
Tx/Mute controls.
The CM1481 will detect and decode all incoming
tone information, controlling the radio functions whilst
providing the operator with various coded audio alerts
to indicate status and progress.
+
-
J1/1
Configuration Interface Connector
Fig.1 A Typical Configuration Setup
J1/13
CM1481
D
U1
+
U3
X1
U4
U2
SWITCH
IN _OUT ^-AUDIO
CM1481 - A Summary of Standard Functions and Features
Configuration by Menu-Driven
Software via a Serial ‘PC’ Link
CCIR, EEA and ZVEI
Toneset/Length Capabilities
HSC Signalling Control Features
Over-Air “Stun” & “Release”
Rapid Over-Air “Re-
Configuration”
Remote Reset
Individual Addressing
Extended Group & Data Tone
Facilities
Simple Radio Interface
Low-Power Requirement
(4.0mA typ)
“Muted” Call Initiation
Programmable I/O Polarities
Lead/Trail Automatic Number
Identification (ANI)
Programmable Lead-In Tone
and Delay
Transponding Facility
Single or Dual Button Operation
Timed Mute Reset
Tx (PTT) Time Out + Warning
PTT (Busy) Lockout
CMOS Compatible Logic
Operators' Coded Call-Alert
Capability
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