Subscriberъs line circuit

专利摘要:
The present invention discloses a reduced power dissipation telephone subscriber line feed circuit in which the battery feed current from the central office is determined by the subscriber loop resistance for medium to long loops, and for shorter loops, for which the battery feed current would exceed a given predetermined threshold, the feed current is limited to the threshold value. The invention also relates to compensation for loop and subset attenuation characteristics. During operation in the current limited mode, attenuation is automatically inserted into the signal transmission and receiving paths in order that normal equalizer operation will not be impaired by current limiting of the battery feed current. A multiple telephone subscriber system is disclosed wherein the circuitry used in deriving current limiting control signals is shared in a multiplexed arrangement by a plurality of subscriber lines. Line feed current is limited in discrete steps to a predetermined threshold value in each subscriber loop upon the detection of an OFF HOOK condition when the feed current drawn by the subset exceeds the threshold value. A plurality of discrete signals are derived by sensing the amount by which the line voltages exceeds a predetermined selected reference voltage value. These discrete signals are used to determine both the effective battery voltage which will produce a d.c. feed current corresponding to the limiting value and the amount of attenuation to be added at the central office by the line circuit to compensate for the equalizer effect in the subscriber set which occurs as a result of the current limiting.
公开号:SU1292672A3
申请号:SU802882443
申请日:1980-02-06
公开日:1987-02-23
发明作者:Трейбер Роберт
申请人:Интернэшнл Стандарт Электрик Корпорейшн (Фирма)；
IPC主号:

专利说明:

The invention relates to telephony, in particular, to power devices for subscriber telephone lines.
The purpose of the invention is to reduce power consumption.
Fig. 1 shows a functional electrical circuit of a subscriber linear circuit; Fig. 2 is a functional electrical circuit of a linear current sensor.
The subscriber’s linear circuit contains a power supply 1, a programmable generator 2, first and second power impedances 3 and 4, respectively, a linear current sensor 5, a tube detector 6, a tube is removed, a group 7 signal processing unit, a common amplifier 8, a transformer 9, shift register 10, analog multiplexer 11, linear current detector block 12, reference level generator 13, clock register 14, digital multiplexer 15, and reference generator 16.
The linear current sensor contains the first, second and third differential amplifiers 17-19, respectively.
The subscriber's linear circuit operates as follows.
The voltage received from the programmable generator 2 may vary selectively in accordance with
the reference control signal supplies the first impedance of the power supply and overvoltage to the subscriber's wires; lines, respectively, through the first and second impedances of power supply 3 and 4. Sensor 5 measures the output voltage of the programmable generator 2, as well as the voltage on the subscriber line wires, and produces a signal proportional to the linear current. This signal is fed to the input of the detector 6, where it is compared with the reference voltage and is determined by the Tube hook position. Signals from Sensors 5 connected to all subscriber lines are fed to block 7. In block 7, the voltage is sent to analog multiplexer 1I together with the voltages from the detectors 6. From the analog multiplexer 11, the signals are sent to block 12, where they are converted into digital form using generator 13 and transmitted to the digital multiplexer 15 via address register 14 to the digital multiplexer 15, The first wire of the subscriber line, the second power impedance, the first terminal of which is connected to the second wire of the power line, and the second terminals of the first and second power impedances are connected to the outputs of the programmable generator and the first and second additional inputs of the linear current sensor generator connected to the output of the reference generator, the inputs of which are connected to the outputs of the shift register, while the sensor linear current
50 are implemented as three differential amplifiers, the first terminals of the first and second differential amplifiers are the first and second inputs of a linear current sensor, the first and the second
55 second additional inputs of which are the second inputs of the first and second differential amplifiers, which: are connected respectively to the first and second inputs of which through registers
ten
o
five
0
five
0
The shift signals control the gain of the common amplifier 8 and, through the reference generator 16, by the programmable generator 2, ensuring their operation depending on the mode (hook tube) and line parameters for each subscriber individually. The implementation of the sensor 5 in the form of three differential amplifiers 17-19 provides accurate determination of the magnitude of the linear current.

权利要求:
Claims (1)
[1]
Invention Formula
A subscriber’s linear circuit containing a power supply unit connected to the subscriber line wires, which are connected to the first and second inputs of a linear current sensor, the output of which is connected through the Tube detector, is removed from the group signal processing unit, as well as a common amplifier, whose input is connected to The first winding of the transformer, the second winding of which is connected to the output of the power supply unit, characterized in that, in order to reduce the power consumption consumed, the shift register, the outputs of which are connected to the control yuschimi total amplifier input and the input with the output .soedinen group obrag block. signal processing, and the power supply unit contains the first power impedance, the first output of which is connected to the first wire of the subscriber line, the second power impedance, the first output of which is connected to the second wire of the subscriber line, and the second conclusions of the first and second power impedances are connected to the outputs of the programmable generator and the first and second additional inputs of the linear current sensor, and the input of the programmable generator is connected to the output of the ethanol generator, the inputs of which are connected to the outputs of the shift register, while the sensors to the line current
Completed as three differential amplifiers, the first terminals of the first and second differential amplifiers are the first and second inputs of a linear current sensor, the first and
the second auxiliary inputs of which are the second inputs of the first and second differential amplifiers, which: are connected respectively to the first and second inputs of the third differential force. a body whose output is the output of a linear current sensor and is connected to the auxiliary input of a batch signal processing unit that contains an analog multiplexer, whose outputs through the detector unit
the linear current and the clock register are connected to the digital multiplexer inputs, the output of which is the output of the group signal processing unit, and the additional inputs of the linear current detector unit are connected to the outputs of the reference level generator.
Editor E. Papp
Compiled by V. Grachev Tehred A. Kravchuk
Order 291/60 Circulation 639.Subscription
VNIIPI USSR State Committee
for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5
Production and printing company, Uzhgorod, Projecto st., 4
FIG. 2
Proofreader O.Lugov

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

---

US06/009,992|US4254305A|1979-02-07|1979-02-07|Current limited subscriber line feed circuit|

---