JPS59216366A - Terminal feeding system - Google Patents

Abstract

PURPOSE:To make efficient feeding to a terminal by charging a storage battery which is provided in the terminal side of an optical network, through an optical cable from the exchange side in accordance with a request signal from a terminal. CONSTITUTION:The optical network consists of an electronic terminal 1 and an exchange 2 connected to this terminal 1 by optical fibers F0 and F1, and a terminal control part 12 supplies a feeding request signal C0 to an electro- photo converter 13 periodically or at the time when a charging request circuit 11 monitors the quantity of accumulated electricity of a storage battery 10 to detect that this quantity is lower than a prescribed threshold value and outputs an energy supply request. The optical signal from the converter 13 is received by a photoelectric converter 20 and is converted to an electric signal; and when this signal is received by a signal transmitting and receiving circuit 22, energy supply is instructed to a feeding circuit 23. When a DC current is supplied to an electro-photo converter 21, it is converted to an optical signal, and this signal is converted to an electric signal by a converter 14 of the terminal, and its DC components are detected by a feed detecting circuit 15 to charge the storage battery 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a terminal power feeding system, and particularly to a terminal power feeding system in an optical network.

In conventional general terminal power supply, when a terminal makes or answers a call, a DC loop is formed between the terminal and the power supply circuit on the exchange side, and DC power is supplied from the power supply circuit, or a local power supply ( This is done using a method that includes a rectifier or storage battery that connects to a commercial power source.

However, these five methods have the disadvantage that, in the former case, a power supply line separate from the optical cable is required in order to supply a direct current of a certain reference potential. Furthermore, in the latter case, there are disadvantages in that the power to the terminal is cut off in the event of a failure of the commercial power source, or the storage battery must be replaced as appropriate due to wear.

An object of the present invention is to eliminate the above-mentioned drawbacks by charging a storage battery provided on the terminal side from the exchange side via an optical cable in response to a request signal from the terminal, and to provide a terminal that enables efficient power supply to the terminal. The purpose is to provide a power supply method.

A terminal power supply system according to the present invention is a terminal power supply system in which power is supplied from an exchange to a terminal via an optical cable, in which the terminal includes means for requesting energy supply to the exchange, and a power receiving system that detects energy supplied from the exchange and charges a storage battery. means, wherein the exchange supplies power to the terminal when receiving a request signal from the energy supply requesting means. Further, the energy supply requesting means is characterized in that it issues a request signal either periodically or when the amount of electricity stored in the storage battery reaches a predetermined threshold value.

Next, the present invention will be explained with reference to the drawings.

The figure is a block diagram showing an embodiment of the terminal power feeding system of the present invention. In the figure, the optical network consists of electronic terminals (hereinafter referred to as TERM) 1. ! :, the TEFLMlto optical fiber Fo
, and an exchange (hereinafter referred to as ESS) 2 connected by F1. The TFIM+ includes a storage battery (hereinafter referred to as DAT) 10 and a charging request circuit (hereinafter referred to as REQ) which monitors the amount of electricity stored in the DAT10 and outputs an energy supply request (electrical signal) when this decreases and reaches a predetermined threshold value. and a terminal control unit (hereinafter referred to as CTL) 12 which controls the transmission of a power supply request signal (digital code) periodically or by the R, EQII output, and also controls the general connection sequence with the ESS 2; Electrical/optical converters (hereinafter referred to as E10) that are connected via DC blocking capacitors (hereinafter referred to as C8 and C1) and convert electrical and optical signals (hereinafter referred to as E10) 13. Optical/electrical converter (hereinafter referred to as 0/E) l4 and the 0/El
The DC component is detected from the electrical signal of 4 outputs and the BATI
Power supply detection circuit (hereinafter referred to as PDT) 1 that supplies charging current to O
5, while the ESS2 is connected to the optical fiber Fo.
.

O/E20 and E1021 are connected oppositely to the E1013 and 0/E14, respectively, via F□, and the 0/E
20, Eloz 1 and the TFJ, M
1, and a power supply circuit (hereinafter referred to as PFU) 23 that supplies a DC power outage to the E1021 in response to an energy supply instruction from the LIC 22.

Next, the operation of this embodiment will be explained. The CTL 12 outputs a power supply request signal (electrical signal) periodically or when REQII monitors the amount of stored electricity in the BAT 10 and detects a decrease below a predetermined threshold and outputs an energy supply request (electrical signal).
digital code) is sent to E1013 via C8. The E1013 converts this into an optical signal and sends it to the ESS2 via the optical fiber Fo. In the ESS2, the optical signal is converted into an electrical signal by the O/E20 and sent to the LIC22 via the C2, and the LIC22 receives the PF'U23.
gives energy supply instructions to Since the PFU 23 supplies DC current to the E1021 based on the instruction, the E102
The optical signal converted in step 1 is sent to THM via optical cable F1.
sent to l. 'I'BI(,PDT15 in Ml
detects a DC component from the electrical signal of the 0/E14 output and supplies charging current to the BATIO. In addition, -E10
The electrical/optical signal conversion by 21 follows a conversion law such that the input DC voltage is proportional to the output light intensity. When charging of the DATIO is completed, the CTL 12 stops sending out the power supply request signal, and therefore the power supply from the ESS 2 is also stopped.

As explained above, according to the terminal power feeding system of the present invention, since power is efficiently fed from the exchange side via the optical cable, there is an effect that the storage battery on the terminal side that is compatible with computerization is automatically charged. Therefore, there is no need to prepare a commercial power supply or replace a storage battery on the terminal side, and there is also no need for a power supply line other than the optical cable between the terminal and the exchange.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of the terminal power feeding system of the present invention. In the figure, l...electronic terminal TE11. M12
・・・・・・Exchange FJSS% io・Old・Storage battery B
AT, 11・old・Charge request circuit REQ, 12・・・・
...Terminal control unit CTL. 13 , 21 ・・・Electric/optical conversion n1-g 7o
, l 4 , 20... Optical/electrical conversion MO/
Es ” ”...Power supply detection circuit PDT, 2
2... Signal transmitting/receiving circuit LIC, 23... Power supply circuit PFU. Agent: Susumu Uchihara, patent attorney

Claims (1)

[Claims] (1) In a terminal power supply system in which power is supplied from an exchange to a terminal via an optical cable, the terminal includes means for requesting energy supply to the exchange, and power receiving means for detecting energy supplied from the exchange and charging a storage battery, A terminal power supply system characterized in that the exchange supplies power to the terminal when receiving a request signal from the energy supply requesting means. (2. In the terminal power feeding system described in claim (1), the energy supply requesting means issues a request signal either periodically or when the amount of electricity stored in the storage battery reaches a predetermined threshold value. A terminal power supply method that is characterized by the following.