IES950211A2 - A communicating circuit - Google Patents

A communicating circuit

Info

Publication number
IES950211A2
IES950211A2 IE950211A IES950211A IES950211A2 IE S950211 A2 IES950211 A2 IE S950211A2 IE 950211 A IE950211 A IE 950211A IE S950211 A IES950211 A IE S950211A IE S950211 A2 IES950211 A2 IE S950211A2
Authority
IE
Ireland
Prior art keywords
wires
circuit
pbx
signal
differential amplifier
Prior art date
Application number
IE950211A
Inventor
Michael O Keeffe
Tom O Gorman
Anthony Bermingham
Brendan O Donoghue
Michael Tope
Tom Delaney
Original Assignee
Lake Electronic Tech
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lake Electronic Tech filed Critical Lake Electronic Tech
Priority to IE950211 priority Critical patent/IES65389B2/en
Publication of IES950211A2 publication Critical patent/IES950211A2/en
Publication of IES65389B2 publication Critical patent/IES65389B2/en
Priority to IE960236A priority patent/IE960236A1/en
Priority to GB9606213A priority patent/GB2299243B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/39—Signalling arrangements; Manipulation of signalling currents using coded pulse groups

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Dc Digital Transmission (AREA)

Abstract

A communicating circuit (1) communicates a system phone (2) to a PBX (3) and comprises wires (5) and (6) for signalling between the system phone (2) and PBX (3). A transmitting circuit (10) in the system phone (2) applies a Manchester encoded digit signal on the wires (5) and (6) which is detected by a differential amplifier circuit (14) in a receiving circuit (12) in the PBX (3). On detection of a signal on the wires (5) and (6) the differential amplifier circuit (14) outputs a singal corresponding to the signal on the wires (5) and (6), which is, in turn, fed to a comparator circuit (15) where it is converted to a HCMOS logic signal suitable for feeding to a buffer of a microprocessor of the PBX. The differential amplifier circuit (14) detects a change in voltage between the wires (5) and (6) which remains constant irrespective of whether induced spurious signals appear on the wires (5) and (6).
IE950211 1995-03-24 1995-03-24 A communicating circuit IES65389B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
IE950211 IES65389B2 (en) 1995-03-24 1995-03-24 A communicating circuit
IE960236A IE960236A1 (en) 1995-03-24 1996-03-21 A communicating circuit
GB9606213A GB2299243B (en) 1995-03-24 1996-03-25 A communicating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IE950211 IES65389B2 (en) 1995-03-24 1995-03-24 A communicating circuit

Publications (2)

Publication Number Publication Date
IES950211A2 true IES950211A2 (en) 1995-10-18
IES65389B2 IES65389B2 (en) 1995-10-18

Family

ID=11040693

Family Applications (2)

Application Number Title Priority Date Filing Date
IE950211 IES65389B2 (en) 1995-03-24 1995-03-24 A communicating circuit
IE960236A IE960236A1 (en) 1995-03-24 1996-03-21 A communicating circuit

Family Applications After (1)

Application Number Title Priority Date Filing Date
IE960236A IE960236A1 (en) 1995-03-24 1996-03-21 A communicating circuit

Country Status (2)

Country Link
GB (1) GB2299243B (en)
IE (2) IES65389B2 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7609646L (en) * 1976-09-01 1978-03-02 Ellemtel Utvecklings Ab MULTI-APPARATUS SYSTEM
CA1239718A (en) * 1985-10-11 1988-07-26 Trillium Telephone Systems Inc. Key telephone system
IE74185B1 (en) * 1990-10-23 1997-07-16 Lake Electronic Tech A digital signal send circuit

Also Published As

Publication number Publication date
GB9606213D0 (en) 1996-05-29
GB2299243A (en) 1996-09-25
IE960236A1 (en) 1996-10-02
IES65389B2 (en) 1995-10-18
GB2299243B (en) 1999-04-21

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Legal Events

Date Code Title Description
FD4E Short term patents deemed void under section 64