WO1993018605A1 - Fibre hybride pour systeme telephonique boucle - Google Patents

Fibre hybride pour systeme telephonique boucle Download PDF

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Publication number
WO1993018605A1
WO1993018605A1 PCT/US1993/001508 US9301508W WO9318605A1 WO 1993018605 A1 WO1993018605 A1 WO 1993018605A1 US 9301508 W US9301508 W US 9301508W WO 9318605 A1 WO9318605 A1 WO 9318605A1
Authority
WO
WIPO (PCT)
Prior art keywords
power
subscriber
ring
recited
subscriber location
Prior art date
Application number
PCT/US1993/001508
Other languages
English (en)
Inventor
Alexandru S. Gliga
Stephen H. Diaz
Gerald L. Shimirak
Dennis Algozer
Original Assignee
Raychem Corporation
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 Raychem Corporation filed Critical Raychem Corporation
Priority to JP5515707A priority Critical patent/JPH07505029A/ja
Priority to SK1045-94A priority patent/SK104594A3/sk
Priority to EP93906101A priority patent/EP0630542A4/fr
Priority to BR9306009A priority patent/BR9306009A/pt
Publication of WO1993018605A1 publication Critical patent/WO1993018605A1/fr
Priority to KR1019940703106A priority patent/KR950700657A/ko

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/003—Telephone sets using electrooptical means in the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring

Definitions

  • the present invention relates to the field of telephony systems and methods of operation thereof.
  • the invention provides an improved telephony system having fiber or other digital media based digital signal transmission combined with metallic based signal transmission to the subscriber.
  • Fiber based telephony networks have become increasingly commonplace in recent years. Fiber based systems have a wide variety of advantages over metallic transmission systems including vastly higher bandwidth. Unfortunately, most subscriber facilities in the United States telephone system and elsewhere continue to rely on metallic (generally copper) based transmission media.
  • a fiber 2 is used to communicate optical digital data signals to a optical network unit (ONU) 4.
  • the ONU is placed in a neighborhood near a subscriber location and is referred to herein as a "curbside" ONU.
  • Optical/electronics (O/E) conversion system 6 converts the optical signals to a serial bit stream of electronic digital signals for transmission to multiplexing/demultiplexing system 8.
  • Multiplexing/ demultiplexing system 8 converts the serial bit stream from the O/E convertor to a plurality of digital signals. These digital signals are converted to analog signals in digital/analog, analog/digital convertor 10 (CODEC) and transmitted to a subscriber facility 12 such as a home or office over one or more metallic conductors 14.
  • CDEC digital/analog, analog/digital convertor 10
  • Network interface device (NID) 18 in the subscriber facility provides protection against lightening strikes and power crossing.
  • the NID also provides multiple connection points for connection of individual pieces of subscriber equipment 22 to the incoming twisted pairs 14.
  • the incoming twisted pairs are often referred to by those skilled in the art as "drops.”
  • Power is supplied to several ONUs (and the subscribers) via a power plant 16.
  • Power plant 16 is located near the ONU, and serves relatively few ONUs (about 14 to 10) to keep the size of power transmission cable 16 within manageable limits.
  • Power plant 16 preferably serves several ONUs within a few square block area. Four houses could use as much as 20 watts of peak power, given the requirement to power five standard phones in each home.
  • the system shown in Fig. 1 has also met with certain limitations.
  • the power plant since the peak power requirements of the phones is high, the power plant must be of reasonably large size, and must frequently be located in residential neighborhoods to maintain a small conductor size to the ONU.
  • These assemblies are sufficiently large that it often becomes necessary to purchase land or right-of-way for placement of the power plant, and local residents often object to the appearance of the power plants.
  • the batteries present maintenance difficulties, particularly since they are placed in an out-doors environment. Other difficulties with such systems include short battery life, particularly in high temperature enclosures.
  • the power and fiber to the ONU come from separate sources, additional engineering and importantly, ditching is required. Other solutions have been proposed.
  • This system and other similar systems also suffer from a variety of limitations. For example, if the ONU provides service to 4 subscribers, users will quickly realize that they can "unplug" the power at their location, and the system will continue to function normally, albeit at the expense of the other users on the system. If all 4 users remove power, battery back-up will allow the system to continue operation for a short period of time, but phone service to all 4 users will eventually fail. Also, when only a portion of the 4 users unplug their system, the remaining users will provide power for operation of their neighbors phones, creating an obviously unfair situation. This arrangement is also unfair to subscribers who use their phones much less than their neighbors. Other limitations include the normal concerns with battery back-up power, the down-time needed when the E/O equipment is serviced, and the like. Still other problems include limited backup.
  • an improved hybrid optical telephony system is needed.
  • the system is "hybrid" in the sense that optical fibers carry telephone signals to a centralized facility, but metallic wires carry telephone signals to subscriber locations from the centralized facility.
  • an ONU houses optical to electronic conversion equipment and multiplexing/demultiplexing equipment.
  • the ONU is placed at, for example, a curbside location or on a telephone pole in a residential neighborhood and serves several users.
  • Digital signals are conveyed to a subscriber facility (meaning, normally, a home or office) from the ONU over metallic connections such as conventional twisted pair wires.
  • a subscriber facility meaning, normally, a home or office
  • digital to analog conversion equipment and a ring generator are located in, for example, a network interface device enclosure.
  • power failures are backed up by providing power to the ONU from a telephone company central office. Such power is provided over metallic wires that are strung, generally in tandem with the optical fiber, to the ONU from the central office. Power to the ONU is extremely reliable because the central office will be provided with not only utility company power, but back-up generators, batteries, and the like.
  • the user is provided with a low power phone. The low power phone is operated during a power failure, in both ring and handset off modes, with batteries at the subscriber location. Conventional phones are, accordingly, disabled during power failures according to one embodiment of the invention.
  • the metallic wires between the ONU and the subscriber location are used to transmit not only the digital signals from the ONU to the subscriber location, but are also used to transmit the power necessary for operation of a low power phone during power failures.
  • an additional set of wires are provided between the ONU and the subscriber location.
  • conventional phones are preferably disabled during power failures. Since the power necessary to ring the low power phone is very small, small gauge wires may be used between the ONU and the subscriber location to power the low power phone. During normal operation power is provided to the conventional user phones from a transformer at the subscriber location, and power is provided to the ONU from the CO. Accordingly, the high power requirements of conventional phones may be met without the need to install large gauge wires from the central office to the ONU and from the ONU to the subscriber location. According to further aspects of the invention, the need for a low power phone is eliminated. According to these aspects of the invention power is also transmitted from the CO to the subscriber location during power failure conditions.
  • the ring cycle of the phone is altered to reduce the duty cycle of the ringer.
  • a storage capacitor is used to average the power demand to the subscriber location to a low level.
  • the ring cycle is altered only if the user has connected more phones than the power feed and storage capacitor can accommodate.
  • the various embodiments of the invention provide lower power consumption, smaller or no remote batteries, smaller less expensive ONUs, and easier migration to Tl, broadband, and fiber to the home services, among other advantages.
  • one embodiment of the invention provides a telephony system comprising an optical fiber, the optical fiber adapted to transmit digital signals representing telephone communications.
  • the system also includes an optical interface with an optical/electronic conversion system coupled to the optical fiber; and a multiplexing/demultiplexing system coupled to the optical/electronic conversion system.
  • a plurality of metallic wires for transmission of digital signals extend from the multiplexing/demultiplexing system to a plurality of subscriber locations.
  • the system provides for a network interface device having a digital to analog conversion system, and a ring generator.
  • Fig. 1 is an illustration of one prior art hybrid telephony system
  • FIG. 2 is an illustration of one embodiment of the invention
  • Fig. 3 is an illustration of another embodiment of the invention
  • Fig. 4 is an illustration of another embodiment of the invention.
  • Fig. 5 illustrates a NID according to one embodiment of the invention in greater detail
  • Fig. 6 illustrates a ring generator according to one embodiment of the invention in greater detail
  • Fig. 7 illustrates a high density embodiment of the invention
  • Fig. 8 is an illustration of mechanical features of one embodiment of the invention.
  • Fig. 9 illustrates a CATV/FITL system.
  • Fig. 10 illustrates an enclosure
  • CO - Central Office ONU - Optical Network Unit E/O - Electro/optic conversion equipment which will generally include systems for both conversion of electrical signals to optical signals and systems for conversion of optical signals to electrical signals.
  • D/A Digital to analog conversion equipment, which will also generally include systems for conversion of analog signals to digital signals and for conversion of digital signals to analog signals. Similarly, multiplexing/demultiplexing equipment will generally be bidirectional. FITL - Fiber in the loop.
  • Standard Phone A phone that generally complies with the requirements of WEL0500 station sets, normally having a ring equivalent number of about 1.
  • Low Power Phone - A phone with a ring equivalent number of less than about 1/2 of a standard phone, preferably having a ring equivalent number of less than about 0.5, more preferably less than about 0.1, and most preferably less than about 0.03.
  • RPU - Remote power unit otherwise referred to as a "power plant.”
  • Fig. 2 is an overall block diagram illustrating aspects of one embodiment of the present invention.
  • digital telephone signals are transmitted from a CO 202 to ONU 4 via optical fiber 2 using means well known to those of skill in the art.
  • Power is transmitted over metallic wires 204 from the CO to the ONU.
  • the power supply in the CO and the wires between the CO and the ONU are sized to provide adequate power to the ONUs connected to the CO, but not for facilities in the subscriber locations, which will generally have large peak power demands.
  • it is desirable for the CO not to provide power to subscriber locations for ring generation of the phones at the subscriber locations. Power is provided to the ONU during both normal operation and utility failures from the CO.
  • the CO is able to provide power to the ONUs during utility power failure using means well known to those of skill in the art such as generators and batteries. Since the peak power demand of the ONUs will be small (due in large part to the lack of a need to provide power during ring cycles of conventional phones) , it is not necessary to provide large gauge wires between the CO and the ONU or large capacity back-up facilities.
  • E/O conversion equipment and multiplexing equipment are connected to output digital transmission signals over wires 14 such as conventional twisted pairs to subscriber locations 12. Although only a single line is shown to the subscriber facility in Fig. 2, it will be apparent that multiple lines may be provided.
  • a NID 20 is provided, which includes conventional lightning protection.
  • the NID 20 also includes D/A conversion equipment and ring generation equipment of the type well known to those of skill in the art. From the NID, analog telephone signals are provided to subscriber equipment 22, which will often include standard analog phones.
  • ring generation may require 3-4 watts to ring 5 RENs, plus one watt for each additional REN.
  • Sufficient power is provided to the subscriber equipment during normal operations from utility lines 206 via AC/DC transformer 208.
  • the conventional phones 22 are disabled. According to some embodiments, the conventional phones are disabled during power failures only to the extent that they will not ring, but they will remain functional to the extent that they can be used for normal conversation and the like.
  • the ring generator provides power to the phones over environment without lines of other subscribers, higher harmonies of the 20 Hz ring cycle need not be filtered, or fewer of the higher harmonies may be filtered. Accordingly, the power demand of the ring generator may be further reduced.
  • the subscriber is provided with at lower power phone 210.
  • Such phones require only a minimum amount of power, and are particularly efficient in the sense that they require only a limited amount of power during a ring cycle (e.g., less than 1 watt and preferably less than 0.3 to 0.5 watts to the ring generator). Accordingly, it becomes possible to provide for all of the power needs of the subscriber during utility failures over the twisted pair wire 14 from the CO.
  • the wires will not be large gauge wires between either the CO and ONU or between the ONU and the subscriber location due to the low peak power demand.
  • the low power phone is replaced with a low power ringer.
  • the conventional phones are still used for conversation and the like, but the phones will not ring during power failures. Instead, the users will be notified of incoming calls with the ringer.
  • the package containing the transformer is designed to hold the low power ringer, minimizing the possibility that a user will loose the ringer.
  • Such low power ringers are energized by, for example, reversing the polarity of the DC voltage on the line.
  • a diode and a choke or time delay would be used to prevent the ringer from sounding during normal DC polarity or normal ringing.
  • a 800 to 1000 Hz signal is sent out on the line for energizing the ringer.
  • the ringers would have a very high impedance to this high frequency, but the sounders would resonate at this frequency.
  • power is not supplied from the CO even under electric utility failures, as shown in Fig. 3. where similar parts are labeled with the same reference numerals. Instead the user maintains a set of back-up batteries with sufficient capacity for operation of the low power phone only. Since the demands of the low power phone will be small, the battery capacity needed by the user will also be small.
  • the twisted pair wires such as 500 feet of 22 awg copper wire, enter the subscriber location, and are again provided with lightening protection.
  • a line card 302 is provided with a ring generator 306 and D/A conversion equipment 304.
  • the conventional phones and the line card are powered by AC/DC convertor 308 from utility power at the subscriber location.
  • the convertor also serves to maintain batteries 306 in a charged state with charger 308. During a power failure, power is provided to the low power phone 310 from the batteries.
  • Table 1 illustrates the power requirements of a typical 4 phone system as illustrated in Fig. 3. TABLE 1
  • the system may utilize standard phones exclusively.
  • the ONU 4 is arranged in a manner similar to that shown in Fig. 3.
  • the ONU is provided with power from the a central location such as the CO, while the subscriber equipment is powered from the subscriber's own utility lines via AC/DC conversion equipment 208.
  • power is provided to the subscriber location via the ONU from the CO.
  • Such power is transmitted over the twisted pair lines, but at a relatively low rate.
  • the twisted pair lines and the power lines to the ONU from the CO may be of relatively small gauge.
  • the level of power transmission available from the ONU will often be insufficient to ring conventional phones, particularly when several such phones are connected to the subscriber location. Accordingly, when a power failure condition is detected, a capacitor 402 is maintained in a charged condition through transmission of power over the twisted pair lines. When a ring signal is detected in the NID, the conventional phones are powered for ringing with the charge stored on the capacitor.
  • Such capacitors will be between about 500 and 1,000 ⁇ F in preferred embodiments, although it will be immediately apparent that a wide range of values will be acceptable depending on the application.
  • the NID 20 is provided with a ring cycle modification circuit 404.
  • the system detects the presence of an extremely high load (such as greater than about 0.75 watts) during a ring cycle.
  • an extremely high load such as greater than about 0.75 watts
  • the length of the ring during a ring cycle is modified by the ring cycle modification circuit 404 to decrease the length of the ring to a level which will not excessively drain the capacitor 402. Therefore, the duty cycle of the ring generator is decreased.
  • the ring cycle modification circuit will decrease the ring cycle in proportion to the load placed on the system.
  • Table 2 illustrates typical ring cycle times as a function of the number of connected phones for a typical system having a 1,000 ⁇ F storage capacitor.
  • Fig. 5 is a block diagram illustrating the NID 20 according to the embodiment shown in Fig. 4 in greater detail.
  • the twisted pair wires carry digital telephony signals, as well as DC voltage, the latter being supplied primarily for or exclusively in a power failure situation.
  • the twisted pair wires enter the system by way of a hybrid or pulse transformer 502.
  • the pulse transformer is a model number ZBK 505/103 made by Siemens.
  • 24 v. DC power is supplied to the system using a rectifier 504 coupled to the twisted pair wires and supplying power from a 120 v. AC power supply.
  • Zener diodes 506 provide appropriate isolation.
  • a voltage convertor 508 provides a 5 v. power supply to the various integrated circuits in the system, while the 24 v. supply is used to power a ring generator 306. During a power outage at the subscriber location, DC power is supplied via the twisted pair wires, also coupled to the ring generator and voltage convertor.
  • Digital telephony signals are transmitted to/ received from CODECS, of which 3 are illustrated in
  • CODECS 510 may be, for example, model number MC 145505 made by Motorola.
  • Each of the CODECS has, among other pins, transmit (TR) , receive (REC) , clock (CLK) , balance (BAL) , and enable (E) .
  • the primary purpose of these chips is to convert the incoming serial data stream into one or more analog signals for use on the subscriber lines.
  • Analog transmitted signals are sent to and received signals are received from SLICs 512 such as a Tamura TTC-124.
  • SLICs 512 provide for two-wire to four-wire conversion among other functions.
  • Operation of the CODECS is regulated under the direction of function generator 514.
  • Timing of the system is regulated by synchro pulse acquisition chip 516, which is used for clock capture from the incoming data and control clock 518, which may be, for example, a model no. MP041 made by CTS.
  • Function generator 514 may be implemented on, for example, an ASIC such as a 170 gate device made by AST.
  • Data channel 520 is used for transmission of various data signals, alarms, test information, and the like.
  • Ring relays 522 are used to generate ring signals for ringing the telephones under the direction of ring generator 306.
  • the duty cycle of the ring generator may be altered, depending upon the load on the lines.
  • the ring generator will decrease the amount of time during which the phones are actually ringing, and/or increase the amount of time between rings.
  • Ring relays operate by transmitting a signal frequency appropriate for ringing the phones. Data are transmitted and received from the phones by the system using pulse code modulation (PCM) in a ping-pong manner according to a preferred embodiment of the invention.
  • PCM pulse code modulation
  • the system may use a first time slot for synchronization, a second, third and fourth time slot for outgoing data, and a fifth time slot for blanking.
  • the next three time slots may be used for incoming data, and the next time slot for data transmission such as off-hook data, test data, or the like.
  • Fig. 6 illustrates a ring generator 306 according to the embodiment shown in Figs. 4 and 5.
  • Power is supplied to the ring generator either of two paths.
  • First lines 602 derive power from the twisted pair lines and are used during power failures at the subscriber location.
  • Second lines derive 604 power from a transformer, preferably in the subscriber's premises.
  • relays connect contacts 608 at a frequency of, for example, 20 Hz to ring the phones. Since power is not at a premium during normal operating conditions, RC circuit 608 may be used to remove high frequency components of the 20 Hz signal 613, reducing any cross-talk between lines while one line is ringing. Accordingly, relays 607 are placed in contact with output lines 611 to produce a 20 Hz sign wave.
  • the RC circuit is not utilized to ring phones during a power failure, since removal of the high frequency components will waste power in the system. Accordingly, ringing of the phones is achieved by connecting contacts 608 of a relay at 20 Hz, but with the RC circuit out of operation by virtue of using pins 610 for output to the phones.
  • the duty cycle of the ring cycle is also modified during power failure conditions.
  • Voltage controlled oscillator (VCO) 612 monitors the voltage on 613, and based on the voltage thereon, outputs a square wave with either a high or low duty cycle. The output of VCO 612 controls optoelectric isolators/solid state relays 614, and is enabled by switch 609 during a power failure.
  • VCO Voltage controlled oscillator
  • the relays alternately connect the incoming DC to either a storage capacitor 616, or connect the storage capacitor to relays 608.
  • the amount of time the capacitor outputs to the phone line is decreased. For example, when 65 v. is detected on the line, the phones will ring for 1.5 seconds and be off for 4 seconds.
  • the ring time decreases to 1.2 seconds, with a ring time of 0.9 seconds for 55 v. and 0.8 seconds for less than 55 v.
  • powering of the NID/subscriber equipment is at different voltage levels during power failure conditions.
  • the subscriber equipment is powered using a 48 v. power supply during normal operations.
  • the subscriber is provided with a first voltage power supply over the twisted pair in an off-hook condition, and a second, higher voltage supply during an off hook condition.
  • the user may be provided with 6 v. , 10 ma power over the twisted pair in an off-hook condition during a power failure, but with 21 v. power during an on-hook condition during a power failure.
  • the system will be provided with a low power SLIC in the NID.
  • the line card in the NID must be powered from the central office, for example, so it is important that the line card and, importantly, the SLIC requires little power in an power failure mode.
  • the low power SLIC will use a hybrid transformer.
  • the low power SLIC will shut down entirely when the phone is on hook during a power failure. This mode will be triggered by, for example, a Hall effect device that will monitor for current in the loop and when it is zero, will turn off most of the SLIC electronics.
  • Embodiment High Density User Environment
  • Fig. 7 illustrates a preferred embodiment of the invention that will have particular application in a high density urban environment.
  • a CO provides optical signals to an ONU 708 using conventional means.
  • E/O conversion equipment converts the optical signals to electrical, digital signals.
  • the electrical digital signals are transmitted over twisted pair wires to several (l to 150, preferably more than 20) living units, which contain D/A conversion equipment.
  • conventional analog subscriber equipment 22 is provided with conventional analog telephone signals.
  • power to the ONU is normally provided with power from a power supply 702 and power is supplied to the subscriber equipment over the twisted pair wire from the ONU.
  • the ONU and the power supply are mounted in one or more weather tight enclosures 704, which are in one embodiment mounted on a telephone pole or the like.
  • Power is supplied to the ONU and the subscriber equipment during utility power failures via a metallic wire 706. Since the distances involved in high density areas will be small, excessively large gauge wires will not be necessary. Such systems will be particularly useful in areas having living unit densities of greater than about 20/ONU, and preferably greater than about 40/ONU.
  • Fig. 8 illustrates the mechanical arrangement of a preferred embodiment of the equipment 704.
  • the system is served by a conventional utility power line 804.
  • the power line is connected to an AC/DC convertor 802 mounted in a weather tight enclosure.
  • the AC/DC convertor will vary in capacity widely from application to application, but may be a 40 watt DC power supply.
  • the AC/DC convertor services the ONU 708 during normal operations and, via the ONU, the subscriber facilities.
  • the ONU is also connected to a composite fiber/copper cable 808 having, for example, 24 individual fibers and copper cables therein.
  • the ONU is connected to a copper terminal box 810, which may include, for example, about 50 Terminator 11 connectors, made by the assignee of the present invention.
  • the individual subscriber facilities are serviced by lines extending from the copper terminal box to the subscriber facilities.
  • Fig. 9 illustrates one such application, in which will provide interactive video to the home.
  • the system therein includes a NID 901 which includes a line card 902 containing D/A conversion equipment and the like, as discussed above. Also included in the NID is CATV amplifier and interdiction electronics 904. Power requirements for the line card are provided according to the embodiments above, while power for the CATV electronics is not provided during electric utility company failures. Instead, the CATV electronics are non-operational, but this will cause little difficulty since televisions will also be non ⁇ functional during such periods of time.
  • the line card serves to provide conventional telephone service to the subscriber equipment 22.
  • the CATV card serves to provide conventional cable television service to televisions/VCRs and other equipment 906.
  • Additional capabilities are provided by way of a track ball mouse, or other user interface device 908 having wire connections to the NID and an IR transmitter 910.
  • the IR transmitter is used to control devices such as VCR's according to means well known to those of skill in the art. The user may, for example, select a show from a listing on the TV screen for recordation. The IR transmitter will then activate the VCR at the appropriate time.
  • the track ball is preferably hard wired via jacks located alongside conventional telephone jacks.
  • the track ball controls a cursor 912 that is displayed on the screen of the television 906.
  • the cursor is generated on the television by overlaying a signal on the CATV signal in the interdiction electronics 904 by means well known to those of skill in the art.
  • An overlay on the CATV signal contains instructions for ordering and is generated under the direction of telephone signals from the line card. This overlay responds to user inputs from the mouse.
  • video games and the like may be generated using the system described above.
  • testability It-will be important that the telephone company be capable of verifying that the wire from the ONU to the NID, the NID itself, the transformer (if any) for providing DC power to NID, and a sounder (if any) be working correctly.
  • the transformer be supplied with a switch that is activated when it is plugged into the wall in the home. AC voltages are sensed by a test circuit built into the transformer housing. The status information from the NID is transmitted to non-volatile memory in the NID via a digital signal. This would take place using capacitor stored energy or by sending some of the CO supplied DC to the sensor circuit for its operation.
  • each card will preferably have a self test circuit on board.
  • the enclosure includes a body 1002, preferably containing three compartments.
  • the compartments include an electronic equipment compartment 1004, a telephone company access side 1006 and a subscriber access side 1008. Details of various aspects of physical enclosures are provided in copending application Serial No. 584,325, filed September 17, 1990, assigned to the assignee of the present invention and previously incorporated herein by reference for all purposes.
  • the compartment 1008 provides easy access to the subscriber while the electronics compartment and telephone company access side are provided with only limited access via a lock or the like.
  • the electronics compartment is preferably provided with vent holes 1010.
  • multi-pin connectors 1011 are provided inside the electronics compartment.
  • One of the multi-pin connectors is adapted to receive a card 1012 containing the primary electronic components of the NID such as the D/A conversion equipment.
  • Another of the connectors is adapted to receive another card such as a CATV card 1014 in some embodiments.
  • Certain of the cards may be provided with cooling fins 1016.
  • a drop pin connector 1018 In the telephone company compartment, several sealed drop pin connectors 1018 are provided for connections to drop wires from the ONU. Additional connections may be provided in this compartment for connection of a CATV coaxial line. Power is supplied via a power supply 1020, preferably with high voltage protection.
  • the subscriber compartment is provided with test access ports, and the like.
  • a cover or door 1022 covers the electrical components compartment, while doors cover the telephone company and subscriber compartments.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Optical Communication System (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Telephonic Communication Services (AREA)

Abstract

L'invention se rapporte à un système qui permet d'assurer un service téléphonique hautement fiable même en cas de panne du réseau de distribution électrique général. Ledit système comprend généralement une unité de réseau optique (11) qui convertit les signaux optiques en signaux électriques et numériques. Les signaux électriques et numériques sont transmis à un poste d'abonné (12). Ledit poste d'abonné utilise un communicateur (20) pourvu d'un générateur de sonnerie (306) et d'un convertisseur analogique-numérique (304). Les caractéristiques mécaniques dudit système sont également décrites.
PCT/US1993/001508 1992-03-02 1993-02-22 Fibre hybride pour systeme telephonique boucle WO1993018605A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP5515707A JPH07505029A (ja) 1992-03-02 1993-02-22 ループ電話システム内のハイブリッドファイバ
SK1045-94A SK104594A3 (en) 1992-03-02 1993-02-22 Telephone system
EP93906101A EP0630542A4 (fr) 1992-03-02 1993-02-22 Fibre hybride pour systeme telephonique boucle
BR9306009A BR9306009A (pt) 1992-03-02 1993-02-22 Sistema de telefônica bifilar dispositivo de interface de rede e processo de fornecer corrente a um local de assinante em uma fibra
KR1019940703106A KR950700657A (ko) 1992-03-02 1994-09-02 루프 전화 시스템의 하이브리드 화이버(hybrid fiber in the loop telephony system)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US84434292A 1992-03-02 1992-03-02
US07/844,342 1992-03-02

Publications (1)

Publication Number Publication Date
WO1993018605A1 true WO1993018605A1 (fr) 1993-09-16

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PCT/US1993/001508 WO1993018605A1 (fr) 1992-03-02 1993-02-22 Fibre hybride pour systeme telephonique boucle

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EP (1) EP0630542A4 (fr)
JP (1) JPH07505029A (fr)
KR (1) KR950700657A (fr)
CN (1) CN1078080A (fr)
BR (1) BR9306009A (fr)
CA (1) CA2117555A1 (fr)
CZ (1) CZ206094A3 (fr)
HU (1) HUT68219A (fr)
MX (1) MX9301165A (fr)
SK (1) SK104594A3 (fr)
WO (1) WO1993018605A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001084820A2 (fr) * 2000-04-29 2001-11-08 Marconi Communications Limited Equipement de telecommunications
WO2001086999A1 (fr) * 2000-05-12 2001-11-15 Siemens Schweiz Ag Unite de terminaison reseau pour un terminal d'utilisateur et procede permettant de fournir, avec une optimisation de la puissance dissipee, une tension d'appel a un terminal d'utilisateur
WO2009102243A1 (fr) * 2008-02-11 2009-08-20 Telefonaktiebolaget Lm Ericsson (Publ) Alimentation distante pour fttx via un fil existant
US7672450B2 (en) 2004-09-09 2010-03-02 Calix Networks, Inc. Network interface device enclosure

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Publication number Priority date Publication date Assignee Title
CN101860635B (zh) * 2010-05-26 2013-04-17 华为技术有限公司 一种光网络单元和电话系统
US20230148042A1 (en) * 2020-05-11 2023-05-11 Nippon Telegraph And Telephone Corporation Communication system and communication method

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US4653988A (en) * 1984-11-10 1987-03-31 Ing. Rolf Seifert Electronic Gmbh Temperature switch mounting means for a function-monitoring fan
US4727572A (en) * 1986-10-06 1988-02-23 Whitney W W Telephone annunciator with low battery indication
US5050164A (en) * 1989-10-31 1991-09-17 Bell Communications Research, Inc. Optical customer premises network

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US3904833A (en) * 1973-06-04 1975-09-09 Superior Continental Corp Ringing generator circuit with capacitor storage
US4653988A (en) * 1984-11-10 1987-03-31 Ing. Rolf Seifert Electronic Gmbh Temperature switch mounting means for a function-monitoring fan
US4727572A (en) * 1986-10-06 1988-02-23 Whitney W W Telephone annunciator with low battery indication
US5050164A (en) * 1989-10-31 1991-09-17 Bell Communications Research, Inc. Optical customer premises network

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See also references of EP0630542A4 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001084820A2 (fr) * 2000-04-29 2001-11-08 Marconi Communications Limited Equipement de telecommunications
WO2001084820A3 (fr) * 2000-04-29 2002-11-14 Marconi Comm Ltd Equipement de telecommunications
WO2001086999A1 (fr) * 2000-05-12 2001-11-15 Siemens Schweiz Ag Unite de terminaison reseau pour un terminal d'utilisateur et procede permettant de fournir, avec une optimisation de la puissance dissipee, une tension d'appel a un terminal d'utilisateur
US7672450B2 (en) 2004-09-09 2010-03-02 Calix Networks, Inc. Network interface device enclosure
WO2009102243A1 (fr) * 2008-02-11 2009-08-20 Telefonaktiebolaget Lm Ericsson (Publ) Alimentation distante pour fttx via un fil existant
US8483561B2 (en) 2008-02-11 2013-07-09 Telefonaktiebolaget Lm Ericsson (Publ) Remote powering for FTTX via existing wire

Also Published As

Publication number Publication date
EP0630542A1 (fr) 1994-12-28
HUT68219A (en) 1995-06-28
HU9402522D0 (en) 1994-11-28
BR9306009A (pt) 1997-10-21
JPH07505029A (ja) 1995-06-01
CA2117555A1 (fr) 1993-09-16
EP0630542A4 (fr) 2000-03-29
CN1078080A (zh) 1993-11-03
MX9301165A (es) 1994-07-29
KR950700657A (ko) 1995-01-16
SK104594A3 (en) 1995-11-08
CZ206094A3 (en) 1995-05-17

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