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Telephone system with current regulation in the constant current region

A technology of telephone system and constant current area, applied in telephone communication, current supply device, electrical components, etc., can solve the problems of increasing power loss, deteriorating reflection and frequency response at the end of transmission line, increasing current, etc.

Inactive Publication Date: 2009-11-18
LANTIQ BET GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, given the fairly flat current profile, this has a negative impact on the stability of the regulation
In addition, the high output resistance RI affects the AC impedance of the circuit and especially worsens reflections and frequency response at the end of the transmission line
[0012] On the other hand, if the output resistance RI is set too small, the current will keep increasing for short transmission lines, resulting in increasing power loss

Method used

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  • Telephone system with current regulation in the constant current region
  • Telephone system with current regulation in the constant current region
  • Telephone system with current regulation in the constant current region

Examples

Experimental program
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Embodiment Construction

[0029] Figure 1a An equivalent circuit diagram of the power supply of the telephone 1 emulated by the interface (SLIC 2) in the off-hook state (receiver removed from the hook) is shown. The equivalent circuit diagram includes a constant current source 20 driving a current I0 and an output resistor RI 21 . The load to be driven includes the resistance 4 of the transmission line 6, the impedance of the telephone 1 and the protection resistor 5 used to protect the system from overload (see figure 2 ).

[0030] Figure 1b The DC characteristics in the off-hook state of the telephone 1 are shown. Actually, this DC characteristic has two regions, constant current region A and resistance region B. The constant current region A is characterized by a characteristic curve a with a relatively small gradient determined by the output resistance 21 RI, while the resistance region B is characterized by a characteristic curve d with a relatively large gradient. Between the constant curr...

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Abstract

A telephone system with constant current region current regulation. The invention relates to a telephone system comprising: a plurality of telephones (1) connected to an interface (2) via a transmission line (6), the interface (2) acting as a DC with a predetermined A characteristic DC power supply; and a unit (16) for generating a DC characteristic in an off-hook state. In order to reduce the current flowing on the transmission line (6), the telephone system also comprises regulating means (13) with which the breakpoint current (IK') of the DC characteristic can be varied, thereby setting a value corresponding to The predetermined setpoint currents (Isetp) are substantially equal currents.

Description

technical field [0001] The invention relates to a telephone system with current regulation in the constant current region. Background technique [0002] There are two basic states of the known telephone, i.e. on-hook (the receiver is positioned on the hook) and off-hook (the receiver has been removed from the hook). In the on-hook state, a constant voltage is output through the SLIC (Subscriber Line Interface Circuit) - no DC current flows, and in the off-hook state, a constant current is output. As a result, it is thus possible to detect various states of the phone. [0003] In the off-hook state, the interface (SLIC) acts as a power source for driving a load that actually consists of the transmission line resistance and the telephone impedance. Figure 1a Shown is the equivalent circuit of an interface consisting of a source IO with an output resistance RI and a load resistance RL. [0004] This equivalent circuit diagram applies to a region called constant current regio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M19/00
CPCH04M19/005
Inventor 阿尔贝托·卡内利亚格哈德·内辛
Owner LANTIQ BET GMBH & CO KG