This means aircrew are alerted to a request for communications without having to listen continuously to messages for other aircraft. It is available in industry standard 16-pin packages. SELCAL works by each aircraft being assigned a different 4-character SELCAL code that allows airlines and communication providers to contact a specific aircraft on a common radio voice frequency. It is a low cost, low power product with superior performance. The FX663 uses new digital signal processing techniques to provide these advantages. A separate, adjustable threshold, signal-level detector which reduces noise falsing.A detector to indicate speech and non- Call progress signals this reduces voice falsing of Call progress Tones and adds Voice-Answer detection as a "connected" prompt.This incorporates a separate 620Hz detector for improved response. "US Busy" Tone detector, saving time needed for "cadence verification" under Busy and Unobtainable conditions.Both the CSD-714 and N1298 models are rack-mounted, 16-tone decoders for the ICAO. Single and dual Tone decoding for better cross-system Call Progress monitoring. AvtechTyees line of ARINC 714 Selective Calling (SELCAL) Decoders are.The FX663 also incorporates the following features: It provides the key features needed for intelligent, full-function, Call progress monitoring by applications involving machine dialling or automatic Call placement. The FX663 decodes the standard audible Tone signals provided by telecom systems worldwide to indicate Dial, Ringing, Busy, Unobtainable and other stages of a Call attempt.
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