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WO1992003004A1 - Contrôleur de puissance a courant alternatif commande par modem - Google Patents

Contrôleur de puissance a courant alternatif commande par modem Download PDF

Info

Publication number
WO1992003004A1
WO1992003004A1 PCT/US1991/005393 US9105393W WO9203004A1 WO 1992003004 A1 WO1992003004 A1 WO 1992003004A1 US 9105393 W US9105393 W US 9105393W WO 9203004 A1 WO9203004 A1 WO 9203004A1
Authority
WO
WIPO (PCT)
Prior art keywords
power
modem
computer
input
relay
Prior art date
Application number
PCT/US1991/005393
Other languages
English (en)
Inventor
Peter S. Pulizzi
Roger W Cook
Stephen J. Kane
Original Assignee
Pulizzi Engineering, Inc.
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 Pulizzi Engineering, Inc. filed Critical Pulizzi Engineering, Inc.
Publication of WO1992003004A1 publication Critical patent/WO1992003004A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/12—Arrangements for remote connection or disconnection of substations or of equipment thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Definitions

  • the present invention relates generally to the field of electronic power controller apparatus and, more particularly, to power controller apparatus especially for electronic computers and the like.
  • a computer work station may be defined as a computer terminal with 20-40 (or more) megabytes of storage and an associated keyboard and monitor.
  • work stations may be connected to a common printer and may be connected to a common main frame computer system (and to one another) by a local area network called a LAN.
  • universities now typically have several main frame computers and for some classes, for instance, engineering and science classes, may have individual work stations for each student.
  • Such computer-to-computer (the term computer hereinafter generally including work stations) communication is by modems which enable the computers to communicate electronically over existing telephone lines. In essence, one computer "calls" the other over a telephone line. When the telephone connection is made, an interchange of digital information is possible.
  • an individual at home may use his computer work station to compose a letter. When completed, the individual at home may use his computer work station to compose a letter. When completed, the individual accesses his office computer by means of modems on both computers and sends (in digital form) the letter thereto, perhaps with instructions that his secretary proofread the letter and send it on to the addres ⁇ see.
  • an individual working at home may access his office computer for data, messages or instruc ⁇ tions.
  • both the sending and receiving computers need to be powered up (that is, booted up) .
  • the corresponding office computer must remain booted up during whatever period of time one or more individuals may want to communicate therewith.
  • the office computer must be booted up most, if not all, of the time in case some communication is required.
  • mainframe computers such continuous powering up is not a problem, since such computers generally have to be kept booted up for proper operation.
  • most computer work stations need to be booted up only when they are actually being used. Keeping such computers booted !
  • a principal objective of the present invention is to provide a relatively simple and economical means for controlling power to computer work stations, computers and even other types of periodically used electrical and electronic equipment.
  • the power controller apparatus of the present invention may utilize an incoming modem signal to boot up an addressed computer work station, computer or the like from a remote location when the computer or the like needs to be used.
  • a modem-controlled power controller for controlling the AC power to computers, computer work stations and the like.
  • the power controller comprises an AC power input adapted for connection to a source of AC power, an AC power output adapted for connection to a computer, a computer work station, or the like, for supplying AC power thereto, and (preferably) a line filter in electrical series between the AC power input and output.
  • a normally-open relay connected between the power input and the power output, is operable between nonconducting and conducting conditions or states. When the relay is in the nonconducting state, AC power from the power input is disconnected from the power output. When the relay is in the conducting state, AC power from the power input is connected to the power output.
  • the power controller includes modem interface means adapted for connecting to a modem for receiving signals, including carrier detect signals, therefrom, such signals being intended for the computer, computer work station or the like connected to the power output.
  • the modem interface means is also adapted for connection to the computer, computer work station or the like for providing the modem signals thereto.
  • control means responsive to receiving the mode carrier signal, in particular the carrier detect signal, for causing the relay to be operated from the nonconducting state to the conducting state. When this occurs, the power input is connected to the power output to thereby provide booting up power to the computer, computer work station, or the like, connected to the power output. In this manner, power is provided to the connected computer, work station, or the like, at least as long as the carrier detect signal is received from th modem.
  • control means are operable for causing the relay to be retained in the conducting condition for a predetermined time period, preferably for at least about five minutes after the carrier detect signal from the modem has ceased. This keeps the connected computer, computer work station or the like booted up in the event of a quick callback or other calls.
  • the modem interface means preferably include meas for isolating the modem from the control means.
  • the isolating means comprise optical coupling means so that the modem signal to the computer, work station, or the like, is not electrically affected by the control means.
  • the control means preferably include an override switch. Such switch enables, as may sometimes be needed or desired, the selective operation of the relay to the conducting state to thereby power up the connected computer, computer work station or the like in the absence of the interface means detecting a carrier detect signal from the modem.
  • the modem interface means and the control means jointly comprise a programmable microprocessor means.
  • This microprocessor means can be programmed for providing security protection, includ- ing password recognition and user callback checking, for the computer, computer work station, or the like, to which the power output is connected.
  • the microprocessor means are also preferably programmable for establishing permitted opera ⁇ tional times during which the power controller is operational for receiving and acting on input signals from the modem, and for determining how long the relay remains in the conducting state after an incoming modem signal received by the micro ⁇ processor means ceases.
  • Figure 1 is a functional block diagram of a representa ⁇ tive remote and local computer system utilizing remote and local modems, and incorporating a modem-controlled AC power controller of the present invention electrically connected between the local modem and the local computer;
  • FIG. 2 is a block diagram showing the functional arrangement of the various parts of the modem-controlled AC power controller of Figure 1;
  • Figure 3 is an electrical schematic drawing showing a preferred electronic implementation of the modem-controlled AC power controller of Figure 2; and Figure 4 is a functional block diagram showing the manner in which the modem-controlled AC power controller of Figure 2 may advantageously be modified to provide security screening and the like by the use of a programmable microprocessor.
  • Figure 1 depicts in functional block diagram form, a representative local-remote, modem-operated computer system 10 in which a mode -controlled AC power controller 12 of the present invention may be used- to advantage.
  • Comprising system 10, in addition to power controller 12, are a -remote computer 14, a remote modem 16, a local modem 18 and a local, computer (or the like) 20.
  • remote modem 16 is electrically connected to remote computer 14 in a conven ⁇ tional manner, for example, by a cable 22 to the computer's serial RS232C port, designated by reference number 24.
  • Shown connected to the output of remote modem 16 is a telephone connection line 28.
  • a similar telephone connection line 30 is shown connected to the input of local modem 18.
  • a cable 32 connects local modem 18 to an RS232C port 34 of power controller 12.
  • a similar cable 36 is connected be ⁇ tween respective RS232C ports 38 and 40 on power controller 12 and local computer 20.
  • a power cord 42 connects power controller 12 to a source of power, for example a 110 vac (or 220 vac) power outlet 44.
  • a power cord 46 of local computer 20 is connected to a power outlet 48 of power controller 12.
  • power controller 12 provides AC (line) power to boot up local computer 20 via power cord 46 in response to the power controller's receiving a carrier detect signal (this signal becomes active when the modem answers a call and detects the presence of a carrier signal from the calling modem), over cable 32, from local modem 18.
  • Power controller 12 provides power to local computer 20 to keep it booted up as long as the carrier detect signal is received from local modem 18, and preferably for a preestablished length of time thereafter.
  • modem-controlled AC power controller 12 com ⁇ prises a high power filtering and control means 50.
  • This filtering and control means 50 generally comprises a power input stage 52, a filtering stage or means 54, a relay stage or means 56 and a power output stage 58, all of which are connected in electrical series by respective electrical lines 60, 62 and 63, and 64.
  • power cord 42 is connected to power input stage 52 and power cord 46 (to local computer 20) is connected to power outlet 4 ' 8 of power output stage 58.
  • Low voltage power supply 70 receives line voltage from line 62 (intercon ⁇ necting filtering stage 54 and relay stage 56) via lines 80 and 81, and provides low voltage (for example, 12 vc) to modem/computer interface means 72 via a line 82 and to control logic means 74 via a line 83.
  • modem/computer interface means 72 are connected to local modem 18 by connector cable 32 and to local- computer 20 by ' connector cable 36.
  • An output line 84 connects modem/computer inter ⁇ face means 72 to control logic means 74 for providing thereto an indication for the carrier detect signal from local modem 18.
  • control logic means 74 are, in turn, connected for operating relay stage 56 by a line 86.
  • relay stage 56 is operative for controlling whether AC line power is provided from power input stage 52 to power output stage 58, ad hence to local computer 20 which is plugged thereinto by power cord 46.
  • relay stage 56 When modem-controlled AC power controller is operational, relay stage 56 is normally open so that power output stage 58 receives no power form power input stage 52 and local computer 20 is not booted up.
  • modem/computer interface means 72 detect, on lie 32, a carrier detect signal from local modem 18, control logic means 74, in response thereto, operates relay stage 56 to the conducting stat, thereby connecting power output stage 58 to power input stage 52 (through filtering stage 54) , and thereby booting up local computer 20. Thereafter, as long as mode /computer interface means 72 continues to sense the carrier detect signal from local mode 18, relay stage 56 is held in the conducting state with the result that local computer 20 stays booted up.
  • Control logic means 74 may be configured so that as soon as modem/computer interface means 72 no longer detects a signal from local modem 18, relay stage 56 is de-energized to the nonconducting state. The immediate result in that case is that power output stage 58 no longer receives power from power input stage 52, and local computer 20 is immediately powered down (i.e., is turned off).
  • control logic means 74 are preferably configured to cause a predetermined delay in powering down local _o .
  • control logic means 74 ar configured for causing at least about five minutes of powering down delay for local computer 20.
  • control logic means 74 may be configured to provide a longer or shorter (or no) powering down delay according to the type of operation needed or desired.
  • Control logic means 74 also preferably include a man ⁇ ually-operated override switch (not shown in Figure 2) to enable closing relay stage 56 in the absence of a carrier detect signal from local modem 18. That is, the override switch permits the booting up of local computer 20 in the absence of a call to local modem 18.
  • a man ⁇ ually-operated override switch (not shown in Figure 2) to enable closing relay stage 56 in the absence of a carrier detect signal from local modem 18. That is, the override switch permits the booting up of local computer 20 in the absence of a call to local modem 18.
  • local computer 20 will be programmed to autoload a com ⁇ munications package when it is booted up by modem-controller AC power controller 12. Local computer 20 will then be ready to receive information and/or instructions from remote com ⁇ puter 14 and to communicate therewith.
  • Computer software for such booting up programming is commercially available for different types of computers 20. Alternatively, the program may be custom-developed to satisfy particular system require ⁇ ments and/or application needs.
  • FIG 3 is an electrical schematic drawing showing a presently preferred manner for implementing mode -controlled AC power controller 12.
  • power input stage 52 comprises a conventional grounded electrical plug 90, a pair of in-line fuses 92 and a system on-off switch 94.
  • Filtering stage 54 preferably comprises a commercially avail- able EMI/RMI filter which may incorporate voltage spike and surge protection.
  • Relay stage 56 comprises a double contact relay 96 having a relay coil 98 across which a diode 100 is connected.
  • Output stage 58 includes grounded receptacle 48 for receiving a conventional power cord plug.
  • Low voltage power supply 70 comprises a dual voltage (120 vac/240 vac) primary step down transformer 102 having primary connections determined by the voltage on lines 80 and 81 from high power filtering and control means 50.
  • a fuse 102 is installed in series in line
  • Transformer 102 yields 24 vac center tapped from its secondary winding. This low voltage is rectified by diodes
  • the rectified and filtered voltage is subsequently regulated by an integrated circuit 112, which may be a type
  • VDD voltage desig- nated as "VDD"
  • Mode /computer interface means 72 comprise the two above- mentioned RS32C connectors 34 and 38 which are hardwired pin ⁇ to-pin.
  • the carrier detect signal is picked off from pin 8 on a line 120 containing a 3.3 Kohm resistor 122. Ground is picked off * *from pin 7 on a line 124.
  • a diode 126 is con ⁇ nected in reverse polarity between lines 120 and 124.
  • the carrier detect signal on line 120 is fed into an opto- isolator integrated circuit 130 (preferably of a type HUBS) which is used to isolate the modem signal from power control ⁇ ler 12.
  • ContxOl logic means 84 provide the timing and control logic of power controller 12, the signal from isolating integrated circuit 130 being processed by integrated circuits in the manner described below and as shown in Figure 3.
  • Relay coil 98 is actuated (over line 86) by a drive transis ⁇ tor 134.
  • a manually-operated override switch 136 (mentioned above) is connected in parallel with drive transistor 134. Switch 136 enables local computer 20 to be booted up in the absence of local modem 18 being called, as sometimes may be needed or desired.
  • Sections 140a and 140b of circuit 140 are wired as a ⁇ bistable latch which unifies the signals from (a) modem/computer interface means 72, (b) a power on initialization circuit 142 (described below) , and (c) a timer 144 (also described below) .
  • a third section 140c of circuit 140 is used as a logic state invertor for the signal output from optoisolator integrated circuit 130.
  • the pin connec ⁇ tions for sections 140a, 140b an 140c of nor-gate circuit 140 are as shown on Figure 3 for an exemplary type 4025 circuit.
  • Power on initialization circuit 142 comprises a capacitor 150 connected in series with VDD.' A resistor 152 and a diode 15 are connected in parallel with one another and in series, to ground, with capacitor 150. Assuming the carrier detect signal from local modem 18 is inactive (that is, is absent) when power is first applied to power controller 12, capacitor 150 couples the rise in VDD voltage to one of the input lines (pin 13) of nor-gate section 140a. This ensures that the latch (comprising sections 140a and 140b) will be set to the inactive state, in which state there will be no power to power output 58. The time duration of this signal should be such that the signal persists longer than any system start up transient.
  • timer 144 comprises a CMOS ripple counter 160 (for example, a type 4050 integrated circuit) with a built-in oscillator which also includes resistors 162 and 164, and capacitor 166.
  • the values of resistors 162 and 164 and capacitor 166 are chosen to produce a frequency of oscilla ⁇ tion which provides the desired turn-off delay (that is, the delay in powering down local computer 20) after the carrier detect signal from local modem 8 ceases.
  • the values of resistance and capacitance shown in Figure 3 provide a turn- off delay of about five or six minutes.
  • Resistor 162 may be a variable resistor to enable the selective adjustment of the turn-off delay time in a manner known to those skilled in the electronics art.
  • timer 144 Operation of timer 144 is as follows: The initial state of ripple counter 160 is not important in determining the power up state of power controller 12, the ripple counter being overpowered by power on initializing circuit 142.
  • the carrier detect signal is received from local modem 18, the output of section 140c of nor-gate 140 switches to the "logic true” state. This sets the latch (comprising sections 140a and 140b of nor-gate circuit 140) and energizes relay, coil 98, via rive transistor 134, thereby providing power to power output stage 58 and booting up local computer 20 connected thereto.
  • a reset signal is applied to ripple counter 160 through its reset input (pin 12) , thereby initializing it.
  • mode /interface means 72 and control logic means 74 may advantageously be replaced by a programmable microprocessor 200 ( Figure 4) .
  • Micropro ⁇ cessor 200 being programmable by a user, provides functions which are beyond the scope of circuitry, such as shown in Figure 3, utilizing small scale integration.
  • microprocessor 200 which may be considered as incorporating various peripheral equipment and circuitry is programmable to perform the following functions:
  • An internal clock 202 operated by a battery 204, provides control of date and time which allow scheduling of access and non-access times and days for power controller 12.
  • Password control of incoming calls to local modem 18 by • screening incoming calls for an allowable user name and/or password as previously stored in a nonvolatile memory 206 before completing the connection (that is, before operating) relay stage 56 to boot up local computer 20.
  • microprocessor 200 may have the capability to remotely control other relays or switches (not shown) to operate equipment other than local computer 20.
  • microprocessor 200 further comprises a central processing unit (CPU) 210, a read only memory (ROM) 212, a random access memory (RAM) 214, input/output (I/O) ports 216 and 218, a universal asynchro ⁇ nous receiver/transmitter (UART) 220, modem/computer inter ⁇ faces 222 and 224, a high speed data/control bus 226, an input/output control bus 228, and a data control bus 230.
  • Buses 226, 228 and 20 interconnect CPU 112, ROM 212, nonvola- tile memory 206, RAM 214, input/output ports 216, 218, UART 220 and modem/computer interfaces 222 and 224 in the manner depicted in Figure * 4.
  • CPU 210 executes program instructions which are primarily stored in ROM 212, and may be any of a number of commercially available CPUs. The selection of the type of CPU 210 affects the selection of ROM 212, RAM 214 and input/output ports 216, 218, in a manner known to those skilled in the microprocessor art.
  • ROM 212 retains the instructions and fixed data required by CPU 210 without a continuous supply of operating power, and may, for example, be of the masked programmed type or ultraviolet light-erasable, electricallyprogrammable (EPROM) type as is well-known in the art. According to the amount of data to be stored, ore than one ROM 21 may be used.
  • RAM 214 holds volatile, temporary data used by micropro ⁇ cessor 200 and/or entered by system users.
  • Nonvolatile memory 206 has the ability to change its data and retain the changes during periods without operating power. Data such as passwords and telephone numbers of authorized callers are stored in nonvolatile memory 206, which may comprise an electrically erasable programmable read only memory (EEPROM) or a battery backed-up RAM.
  • EEPROM electrically erasable programmable read only memory
  • Real time clock 202 may be a commercial integrated circuit, battery backed-up clock device which maintains the current date and time of day regardless of the power-on status of microprocessor 200 or power controller 12.
  • Input/output ports 216 and 218 are of the same family as CPU 210, ROM 212 and RAM 214 and provide an interface between high speed data/control bus 226 and the various other system components, as shown in Figure 4.
  • UART 220 is a dual channel, commercially available integrate circuit which provides serial-to-parallel and parallel-to-serial data conversions for communications over modem/computer interfaces 222 and 224. Serial-to-parallel data is necessary since most modems typical of local modem 18, operate in the serial mode. UART 220 enables power controller 12 to communicate both with local modem 18 and local computer 20.
  • Modem/computer interfaces 222 and 224 preferably comply with Electronics Industry Association Recommended Standard 232 (EIA RS232C) and enable two-way communication between local modem 18 and UART 220 over data/control bus 230.
  • EIA RS232C Electronics Industry Association Recommended Standard 232
  • microprocessor 200 taken in conjunction with Figure 4 will enable those skilled in the microprocessor and computer arts to make and use the microprocessor.
  • system 10 and modem-controlled AC power controller 12 have been descried as using or being used with computer 20, which has been defined as a local computer to distinguish it from a remotely-located computer 14 ( Figure 1)
  • the present modem-controlled power controller can be used with other types of equipment or machinery which is to power-up upon command from a remote location.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Communication Control (AREA)

Abstract

Un contrôleur (12) de puissance commandé par modem destiné à commander la puissance CA transmise à des ordinateurs fournit une puissance CA à un ordinateur (20) et comporte un filtre de ligne (54) électriquement en série entre l'entrée de puissance (52) et la sortie de puissance (58). Un relai (56) situé entre l'entrée de puissance (52) et la sortie de puissance (58) comporte des contacts normalement ouverts pouvant être actionnés entre des états ouverts et fermés, l'état ouvert déconnectant la puissance CA de l'entrée de puissance (52) à la sortie de puissance (58). Un circuit logique de commande (74) répond à l'interface du modem (72) pour fermer les contacts du relai afin de connecter la sortie de puissance (58) à l'entrée de puissance (52), et afin de maintenir les contacts du relai à l'état fermé pendant au moins environ cinq minutes après que le signal de détection de porteur cesse lors de la réception par le modem (18). Dans un autre mode de réalisation, un microprocesseur (200) remplace la logique de commande (74) et l'interface (72).
PCT/US1991/005393 1990-07-30 1991-07-30 Contrôleur de puissance a courant alternatif commande par modem WO1992003004A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55929290A 1990-07-30 1990-07-30
US559,292 1990-07-30

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WO1992003004A1 true WO1992003004A1 (fr) 1992-02-20

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH681262A5 (en) * 1992-07-20 1993-02-15 Jean Pierre Zoebeli Automatic disconnection circuit for telephone answering or facsimile machine - and reduces current consumption by disconnecting load at end of each call
EP0573204A2 (fr) * 1992-06-05 1993-12-08 Advanced Micro Devices, Inc. Système de connexion pour réseau
EP0582877A2 (fr) * 1992-08-08 1994-02-16 Alcatel SEL Aktiengesellschaft Méthode et dispositif pour échange de données rapide
CH685656A5 (de) * 1994-03-07 1995-08-31 Martignoni Electronics Ag Einrichtung zum Empfang von Daten.
US5731461A (en) * 1996-01-03 1998-03-24 Condea Vista Company Surfactant composition and process for producing same
US5750749A (en) * 1996-02-09 1998-05-12 Condea Vista Company Polyhydroxy-fatty amide surfactant composition and method of preparing same
EP2210365B1 (fr) * 2007-10-09 2018-07-18 Endress+Hauser Process Solutions AG Fonctionnement économe en énergie d'une interface de communication filaire d'un appareil de terrain

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US4051326A (en) * 1975-09-30 1977-09-27 Ing. C. Olivetti & C., S.P.A. Arrangement for the remote switching-on and initialization of a data terminal
US4647721A (en) * 1985-03-19 1987-03-03 Dynatech Computer Power, Inc. Telephone activated power controller
US4656318A (en) * 1985-05-09 1987-04-07 Hewlett-Packard Company Modem with power-off ring detection
US4701946A (en) * 1984-10-23 1987-10-20 Oliva Raymond A Device for controlling the application of power to a computer
US4723269A (en) * 1985-12-23 1988-02-02 Compaq Telecommunications Corporation Method and apparatus for power-up of unattended computer
US4815031A (en) * 1985-09-02 1989-03-21 Nec Corporation Method for granting a request to authorized data terminal users accessing from any locations
US4907254A (en) * 1986-06-23 1990-03-06 Kokusai Denshin Denwa Kabushiki Kaisha Power source system for data terminal equipment
US4922450A (en) * 1987-10-08 1990-05-01 Rose Frederick A Communications management system having multiple power control modes
US5003578A (en) * 1989-08-11 1991-03-26 Lin Den K Power-saving device for a cable-information receiving/transmitting apparatus
US5012233A (en) * 1989-09-07 1991-04-30 At&T Bell Laboratories Communication system comprising a remotely activated switch

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051326A (en) * 1975-09-30 1977-09-27 Ing. C. Olivetti & C., S.P.A. Arrangement for the remote switching-on and initialization of a data terminal
US4701946A (en) * 1984-10-23 1987-10-20 Oliva Raymond A Device for controlling the application of power to a computer
US4647721A (en) * 1985-03-19 1987-03-03 Dynatech Computer Power, Inc. Telephone activated power controller
US4656318A (en) * 1985-05-09 1987-04-07 Hewlett-Packard Company Modem with power-off ring detection
US4815031A (en) * 1985-09-02 1989-03-21 Nec Corporation Method for granting a request to authorized data terminal users accessing from any locations
US4723269A (en) * 1985-12-23 1988-02-02 Compaq Telecommunications Corporation Method and apparatus for power-up of unattended computer
US4907254A (en) * 1986-06-23 1990-03-06 Kokusai Denshin Denwa Kabushiki Kaisha Power source system for data terminal equipment
US4922450A (en) * 1987-10-08 1990-05-01 Rose Frederick A Communications management system having multiple power control modes
US5003578A (en) * 1989-08-11 1991-03-26 Lin Den K Power-saving device for a cable-information receiving/transmitting apparatus
US5012233A (en) * 1989-09-07 1991-04-30 At&T Bell Laboratories Communication system comprising a remotely activated switch

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0573204A2 (fr) * 1992-06-05 1993-12-08 Advanced Micro Devices, Inc. Système de connexion pour réseau
EP0573204A3 (en) * 1992-06-05 1994-09-21 Advanced Micro Devices Inc Network connection system
US5404544A (en) * 1992-06-05 1995-04-04 Advanced Micro Devices System for periodically transmitting signal to/from sleeping node identifying its existence to a network and awakening the sleeping node responding to received instruction
CH681262A5 (en) * 1992-07-20 1993-02-15 Jean Pierre Zoebeli Automatic disconnection circuit for telephone answering or facsimile machine - and reduces current consumption by disconnecting load at end of each call
EP0582877A2 (fr) * 1992-08-08 1994-02-16 Alcatel SEL Aktiengesellschaft Méthode et dispositif pour échange de données rapide
EP0582877A3 (fr) * 1992-08-08 1995-07-19 Sel Alcatel Ag Méthode et dispositif pour échange de données rapide.
CH685656A5 (de) * 1994-03-07 1995-08-31 Martignoni Electronics Ag Einrichtung zum Empfang von Daten.
EP0671831A1 (fr) * 1994-03-07 1995-09-13 Martignoni Electronics Ag Dispositif de réception de données
US5731461A (en) * 1996-01-03 1998-03-24 Condea Vista Company Surfactant composition and process for producing same
US5847210A (en) * 1996-01-03 1998-12-08 Condea Vista Company Process for producing surfactant composition
US5750749A (en) * 1996-02-09 1998-05-12 Condea Vista Company Polyhydroxy-fatty amide surfactant composition and method of preparing same
EP2210365B1 (fr) * 2007-10-09 2018-07-18 Endress+Hauser Process Solutions AG Fonctionnement économe en énergie d'une interface de communication filaire d'un appareil de terrain

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