IEICE TRANSACTIONS on transactions
Power Feeding for Telephone Subscribers in Japan's Information Network System
Summary :
This paper describes power feed techniques for telephone subscribers in a metallic two-wire digital subscriber loop system and optical fiber subscriber loop systems. In a metallic two-wire digital subscriber loop system, Digital Service Unit (DSU) and Digital Telephone (DTEL) are installed on the subscriber premises. The power consumption of the equipment increases compared with that of the conventional analog telephone. Therefore, it is difficult to feed sufficient power to the equipment using a conventional 48 V constant-voltage power supply. A constant current power feeding method from the central office is suitable because constant power can be obtained with little energy loss. A small-size and low-cost constant current converter has been developed. In optical fiber subscriber loop systems, it is difficult to feed the customer's equipment with power from the central office. Therefore, an uniterruptible DC power unit has to be installed on the subscriber's premises. The power unit is composed of sealed lead-acid batteries and a multi-input converter which has rectifier and DC-DC converter functions. This converter is very small and low-cost. The life of a sealed lead-acid battery can be prolonged by coating the outside of the battery container with aluminum or fluoric-resin film, and by optimizing the calcium content in the electrode grid alloy.
- Publication
- IEICE TRANSACTIONS on transactions Vol.E70-E No.5 pp.510-515
- Publication Date
- 1987/05/25
- Publicized
- Online ISSN
- DOI
- Type of Manuscript
- PAPER
- Category
- Electronic Circuits
Authors
Keyword
Latest Issue
Copyrights notice of machine-translated contents
The copyright of the original papers published on this site belongs to IEICE. Unauthorized use of the original or translated papers is prohibited. See IEICE Provisions on Copyright for details.
Cite this
Copy
Tsutomu OGATA, Tohru KOYASHIKI, Kenji AKUTO, Katsuichi YOTSUMOTO, "Power Feeding for Telephone Subscribers in Japan's Information Network System" in IEICE TRANSACTIONS on transactions,
vol. E70-E, no. 5, pp. 510-515, May 1987, doi: .
Abstract: This paper describes power feed techniques for telephone subscribers in a metallic two-wire digital subscriber loop system and optical fiber subscriber loop systems. In a metallic two-wire digital subscriber loop system, Digital Service Unit (DSU) and Digital Telephone (DTEL) are installed on the subscriber premises. The power consumption of the equipment increases compared with that of the conventional analog telephone. Therefore, it is difficult to feed sufficient power to the equipment using a conventional 48 V constant-voltage power supply. A constant current power feeding method from the central office is suitable because constant power can be obtained with little energy loss. A small-size and low-cost constant current converter has been developed. In optical fiber subscriber loop systems, it is difficult to feed the customer's equipment with power from the central office. Therefore, an uniterruptible DC power unit has to be installed on the subscriber's premises. The power unit is composed of sealed lead-acid batteries and a multi-input converter which has rectifier and DC-DC converter functions. This converter is very small and low-cost. The life of a sealed lead-acid battery can be prolonged by coating the outside of the battery container with aluminum or fluoric-resin film, and by optimizing the calcium content in the electrode grid alloy.
URL: https://global.ieice.org/en_transactions/transactions/10.1587/e70-e_5_510/_p
Copy
@ARTICLE{e70-e_5_510,
author={Tsutomu OGATA, Tohru KOYASHIKI, Kenji AKUTO, Katsuichi YOTSUMOTO, },
journal={IEICE TRANSACTIONS on transactions},
title={Power Feeding for Telephone Subscribers in Japan's Information Network System},
year={1987},
volume={E70-E},
number={5},
pages={510-515},
abstract={This paper describes power feed techniques for telephone subscribers in a metallic two-wire digital subscriber loop system and optical fiber subscriber loop systems. In a metallic two-wire digital subscriber loop system, Digital Service Unit (DSU) and Digital Telephone (DTEL) are installed on the subscriber premises. The power consumption of the equipment increases compared with that of the conventional analog telephone. Therefore, it is difficult to feed sufficient power to the equipment using a conventional 48 V constant-voltage power supply. A constant current power feeding method from the central office is suitable because constant power can be obtained with little energy loss. A small-size and low-cost constant current converter has been developed. In optical fiber subscriber loop systems, it is difficult to feed the customer's equipment with power from the central office. Therefore, an uniterruptible DC power unit has to be installed on the subscriber's premises. The power unit is composed of sealed lead-acid batteries and a multi-input converter which has rectifier and DC-DC converter functions. This converter is very small and low-cost. The life of a sealed lead-acid battery can be prolonged by coating the outside of the battery container with aluminum or fluoric-resin film, and by optimizing the calcium content in the electrode grid alloy.},
keywords={},
doi={},
ISSN={},
month={May},}
Copy
TY - JOUR
TI - Power Feeding for Telephone Subscribers in Japan's Information Network System
T2 - IEICE TRANSACTIONS on transactions
SP - 510
EP - 515
AU - Tsutomu OGATA
AU - Tohru KOYASHIKI
AU - Kenji AKUTO
AU - Katsuichi YOTSUMOTO
PY - 1987
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E70-E
IS - 5
JA - IEICE TRANSACTIONS on transactions
Y1 - May 1987
AB - This paper describes power feed techniques for telephone subscribers in a metallic two-wire digital subscriber loop system and optical fiber subscriber loop systems. In a metallic two-wire digital subscriber loop system, Digital Service Unit (DSU) and Digital Telephone (DTEL) are installed on the subscriber premises. The power consumption of the equipment increases compared with that of the conventional analog telephone. Therefore, it is difficult to feed sufficient power to the equipment using a conventional 48 V constant-voltage power supply. A constant current power feeding method from the central office is suitable because constant power can be obtained with little energy loss. A small-size and low-cost constant current converter has been developed. In optical fiber subscriber loop systems, it is difficult to feed the customer's equipment with power from the central office. Therefore, an uniterruptible DC power unit has to be installed on the subscriber's premises. The power unit is composed of sealed lead-acid batteries and a multi-input converter which has rectifier and DC-DC converter functions. This converter is very small and low-cost. The life of a sealed lead-acid battery can be prolonged by coating the outside of the battery container with aluminum or fluoric-resin film, and by optimizing the calcium content in the electrode grid alloy.
ER -
English
