Telephonic communications – Supervisory or control line signaling – Substation originated
Patent
1990-02-01
1992-10-20
Dwyer, James L.
Telephonic communications
Supervisory or control line signaling
Substation originated
379387, 379352, 379418, 379355, H04M 126
Patent
active
051577208
ABSTRACT:
A telephone circuit arrangement allows the use of a (high voltage) dialler chip (3) without a mode select output in a low voltage telephone. A filter (R1,C1) derives control signals from the DTMF output of the dialler chip. The control signals switch a control switch (TR1) connected to the Mode Select input (MS) of a transmission circuit (2) and the DTMF signals are applied to an input (T1) of transmission circuit (2). This enables the use of a dialler chip without a dedicated mode select output in a circuit which normally requires a dialler chip with a mode select output.
REFERENCES:
patent: 3988549 (1976-10-01), Merlin et al.
patent: 4286120 (1981-08-01), Sublette
patent: 4315108 (1982-02-01), Hoffman et al.
patent: 4508938 (1985-04-01), Bench et al.
patent: 4571723 (1986-02-01), Lusignan et al.
patent: 4585909 (1986-03-01), Otter et al.
patent: 4640993 (1987-02-01), Whittaker
patent: 4675902 (1987-06-01), Boeckmann
patent: 4827503 (1989-05-01), Takato et al.
Motorola Telecommunications Device, Technical Data, pp. 2-293 through 2-309, "MC34014 Telephone Speech Network with Dialer Interface".
UMC, Technical Data, pp. 2-17 through 2-27, "UM91214/15 Series Tone/Pulse Dialer".
OKI Semiconductor, Technical Data, pp. 139-148, "MSM6052 CMOS 4Bit Single Chip Low Power Microcontroller for Telephone".
ALCATEL N.V.
Dwyer James L.
Shehata M.
LandOfFree
Dialler chip mode signal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dialler chip mode signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dialler chip mode signal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-199196