Telephonic communications – Supervisory or control line signaling – Substation originated
Patent
1996-03-20
1998-10-13
Zele, Krista
Telephonic communications
Supervisory or control line signaling
Substation originated
379 42, 379 50, 379 9203, 379 9204, H04M 1104
Patent
active
058224238
ABSTRACT:
A supervisory signal for a derived channel data reporting system is implemented as a tone having a frequency capable of transmission using a telephone signal communicating network, including networks incorporating digital equipment, at an attenuated level. The tone preferably has a frequency of from 200 Hz to 300 Hz, and is capable of operating in conjunction with biphase modulated (BPSK), frequency shift keyed (FSK) and multi-tone modulated (MLT) polling systems. Such frequencies are effectively communicated by conventional digital loop carrier systems, despite a limited frequency range, and are of a sufficient magnitude to be detected by the derived channel data reporting system.
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Darr Roger Raymond
Eakes James W.
Hughey Stephen A.
Jehnert Walt
Cohen Gary M.
NumereX Investment Corporation
Saint-Surin Jacques M.
Zele Krista
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