12th International Conference on Telecommunications Energy

22-25 Oct. 1990

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Displaying Results 1 - 25 of 97
  • INTELEC: Twelfth International Telecommunications Energy Conference (Cat. No.90CH2928-0)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (355 KB)
    Freely Available from IEEE
  • Learnings and challenges of the Northern California earthquake (telephone services)

    Publication Year: 1990
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (71 KB)

    Summary form only given. The impact on Pacific Bell of the October 1989 San Francisco Bay earthquake is addressed. Due to emergency power backup, telephone services were perceived as reliable. The performance of digital loop carrier and remote electronics under critical conditions is reported, and the lessons learned are briefly discussed.<> View full abstract»

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  • Wind storms in Britain (BT power systems)

    Publication Year: 1990, Page(s):2 - 7
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (447 KB)

    Two hurricane-force storms in the past three years have severely tested the British Telecom UK network. The task of restoring telecommunications service presented huge challenges in the deployment of staff equipment and materials. Experience was gained about both systems and procedures and, in particular, the importance of remote alarm, interrogation, and control facilities. The author describes t... View full abstract»

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  • Digging out after Hugo (telephone restoration)

    Publication Year: 1990, Page(s):8 - 15
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1010 KB)

    The chain of events and some lessons learned by Southern Bell Telephone Company during their struggle with Hugo, a class four hurricane, are outlined. A brief description of emergency operations before, during, and after the hurricane is given.<> View full abstract»

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  • Power and backup power considerations for the ISDN network termination 1 (NT1)

    Publication Year: 1990, Page(s):16 - 21
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The evolution to a narrowband integrated services digital network (ISDN) necessitates the installation of additional electronics at the user end of the loop. Providing power and backup power for these electronics (referred to as the network termination 1 (NT1)) offers challenges to designers. One problem is that reliability and backup powering are not currently addressed in a uniform manner in the... View full abstract»

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  • Locally powering fiber-in-the-loop voice lines

    Publication Year: 1990, Page(s):22 - 28
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Bellcore's preliminary and evolving views are presented of a generic architecture for powering the optical network unit (ONU) locally for voice lines. A typical local power architecture is discussed that can be used to provide power and backup power for the ONU in a fiber-to-the-curb system. The architecture is intended to provide the power and backup power in a reliable and cost-effective manner.... View full abstract»

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  • A simulated optical network unit for battery characterization in the outside plant

    Publication Year: 1990, Page(s):29 - 34
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    With the arrival of fiber in the local subscriber loop, local exchange companies (LECs) are facing the need for placing an optical network unit (ONU) at or near each. To show that ONU design objectives can be met at reasonable cost when higher grade cells are used in a properly designed and maintained battery system, Bellcore has initiated a field demonstration of batteries powering simulated ONUs... View full abstract»

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  • A novel high frequency PWM push-pull inverter generates sinusoidal output voltage at 50 Hz

    Publication Year: 1990, Page(s):35 - 40
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    Two new topologies are presented for a single-phase PWM push-pull inverter with sinusoidal output voltage at 50 Hz. The inverter comprises power MOSFETs, fast recovery diodes, ferrite core transformers, and compact resonant filters tuned to twice the switching frequency of 25 kHz. It has high power-to-weight ratio, low total harmonic distortion and good output voltage regulation for both input vol... View full abstract»

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  • High frequency inverter using zero current turn off COMFET switches for solar energy conversion

    Publication Year: 1990, Page(s):41 - 46
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (393 KB)

    A high-performance utility-interactive series resonant inverter operating in a quasi-resonant mode is analyzed. The maximum power tracking is achieved by a linear control circuit. The inverter uses controllable turn-on and zero current turn-off COMFET switches operating in inaudible frequency range (20-100 kHz). The inverter switches operate in the soft commutation mode, no dissipative snubber is ... View full abstract»

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  • Energy saving features of the Autoplex cellular telecommunications system

    Publication Year: 1990, Page(s):47 - 54
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (593 KB)

    Autoplex is a cellular mobile telecommunications system that uses a distributed power system as part of its total approach to providing high quality, high availability communications. First, the Autoplex system is described briefly. Then, the contribution of its distributed power system to overall system availability is discussed. Finally, the contribution of dynamic power control to energy saving... View full abstract»

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  • A new decentralized DC power system for telecommunications systems

    Publication Year: 1990, Page(s):55 - 62
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A new decentralized power system has been developed to decrease the cost and the floor space requirements of the conventional decentralized power system now used by NTT. The new system is composed of rectifiers, booster converters, and batteries. The maximum output current of the system is 1000 A at the output voltage of 48 V DC. It can decrease annual cost by about 20% for power equipment, constr... View full abstract»

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  • Will distributed on-board DC/DC converters become economically beneficial in telecom switching equipment?

    Publication Year: 1990, Page(s):63 - 69
    Cited by:  Papers (5)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (594 KB)

    The author considers different power distribution systems for telephone switching equipment. Described are central distribution, decentralized distribution with one converter per shelf, and decentralized distribution with distributed on-board supplies. Besides a choice between a more central type of power supply and a distributed architecture, there is also a choice of whether the design shall be ... View full abstract»

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  • Power distribution scheme for the KDD's new international telecommunications center

    Publication Year: 1990, Page(s):70 - 75
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (289 KB)

    Consideration is given to the power distribution scheme of the new international telecommunications center. A comparison is made between the conventional centralized power architecture and the new decentralized type. The comparison is made carefully taking account of major parameters: reliability, cost, influence of power damage, the space occupied, and efficiency. The authors have concluded that ... View full abstract»

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  • The introduction of switched mode power-a change of culture

    Publication Year: 1990, Page(s):76 - 81
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (373 KB)

    The operational effects and experience are described of introducing switched mode power supplies, the BT Rectifier No. 160, within British Telecom over the first five years. The cultural and operational problems that occurred and their solutions are explained, as well as the changes necessary with regard to repairs, spares, and buffer stock holdings in order to meet the overall reliability require... View full abstract»

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  • A new development in emergency power for small to mid sized CPE telephone systems

    Publication Year: 1990, Page(s):82 - 87
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (254 KB)

    Research and engineering for a new development in small emergency power systems are described. Insight is provided into the problems and solutions of providing clean stable power for small telephone and computer systems from small emergency generators. While large telephone systems have carefully engineered emergency power systems, the small user has had very few choices in powering a PABX or key ... View full abstract»

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  • A novel 12 kW switch mode power supply

    Publication Year: 1990, Page(s):88 - 96
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (517 KB)

    A new 200 A switch mode power supply (SMPS) for telecommunications applications was developed. The authors detail the most significant electrical characteristics of the SMPS. The power transfer mechanism is based on a full bridge PWM configuration. The basic switching device chosen was the power MOSFET. This semiconductor is packaged by various companies in isolated modules containing four paralle... View full abstract»

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  • A high performance 25 amp modular SMR

    Publication Year: 1990, Page(s):97 - 106
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (727 KB)

    Presented are the design strategies and trade-offs encountered developing a high-performance 1.5 kW switch mode power supply more compatible with the needs of small sized telecommunications centers. The proposed environmentally hardened design allows for a -40 degrees to 65 degrees standard power supply operating range, 12000 A lightning withstand capabilities, and a number of electrical performan... View full abstract»

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  • A power-factor improved AC to DC converter

    Publication Year: 1990, Page(s):107 - 111
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (201 KB)

    A new AC-to-DC converter is described which improves the power factor of the AC input line. The converter is composed of a forward converter and a flyback-derived voltage-commutated circuit. When the switching transistor is on, the induced voltage across the transformer is applied to the inductor of the feedback circuit, and energy is stored. When the input voltage is high, the voltage across the ... View full abstract»

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  • A switched-mode 200 A 48 V rectifier/battery charger for telecommunications applications

    Publication Year: 1990, Page(s):112 - 118
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (489 KB)

    A 200 A rectifier has been specifically designed to power telephone switching equipment. It is a constant-voltage, current-limited PWM SMPS (switched-mode power supply) with instrumentation and other features suitable for this type of application. A controlled rectifier utilizing MOSFET switches converts the 3-phase-input AC power to a regulated 400 V DC supply. The switching scheme ensures that t... View full abstract»

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  • Modular integrated power system

    Publication Year: 1990, Page(s):119 - 126
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (318 KB)

    The development of the Northern Telecom modular integrated power systems (MIPS) concept is described. The key issues related to the co-location of power, switching, and transmission equipment are addressed. The simplicity of the grounding of the distributed power is described in comparison with the complex and unmanageable grounding of the centralized power systems. The desirable reduction of the ... View full abstract»

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  • A system approach assures quality battery plant performance

    Publication Year: 1990, Page(s):127 - 133
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (531 KB)

    The design of a telephone central office telecommunication battery plant is discussed with an emphasis on the critical processes required to insure a quality performing battery plant-thorough and complete requirements, design considerations, and system integration testing. Two perspectives of a quality battery plant are presented-the vendor's and the user's.<> View full abstract»

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  • Ring battery charger, by individual cell or group of three cells-for discharge capacity enhancement

    Publication Year: 1990, Page(s):134 - 137
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    Three methods are described for providing increased float voltage levels to lead acid cells, while maintaining output line voltage at acceptable or well regulated levels. The first is a momentary boost of individual cells, one at a time, the second is a momentary boost of three cells, one group at a time, and the third method is a momentary 'blast' of individual cells, one at a time. It is estimat... View full abstract»

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  • A constant voltage power plant that uses batteries as its emergency source of power

    Publication Year: 1990, Page(s):138 - 140
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (166 KB)

    Described is a system that regulates voltage to the load. It is also efficient and incurs some economic benefits. It is explained how this power system provides more effective use of battery back-up power for more capacity, faster recharge after discharge, longer life, and less investment; has, during normal (not emergency) operation, rectifiers that are more efficient, have less connected load fo... View full abstract»

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  • The 3000 amp adjustable voltage regulator and switch

    Publication Year: 1990, Page(s):141 - 146
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A 3000 A three-terminal voltage regulator and switch designed to maintain a constant voltage to the bus in the event of utility power failure is described. It allows for the connection of unequal battery strings. For example, a 27-cell string, in series with this regulator, can be paralleled with the standard 24-string plant. The advantage of this configuration is derived from the higher voltage s... View full abstract»

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  • The challenge of powering emerging services (optical fiber networks)

    Publication Year: 1990
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    Summary form only given. Power supplies for fiber optic networks are discussed. Three ways to provide power in a fiber system are mentioned. Most of these architectures can be implemented in numerous ways. One way to provide power is to extend copper along with the optical fiber, either within the same or an external sheath. This system allows power to be provided by remote or central office termi... View full abstract»

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