Abstract:
A surge protector (10) for protecting telecommunications related equipment and other associated sensitive electrical components from over-voltage transient occurring on tip/ring conductors (A-H) of telecommunication lines coupled thereto includes a printed circuit board (14) and a plurality of surge protection circuits (12a-12d) being mounted on the printed circuit board (14). Each of the plurality of surge protection circuits (12a) includes a first set of steering diodes (D1, D2, D17, D18) and a second set of steering diodes (D3, D4, D19, D20). A common transient voltage clamping device (D33) has a first end connected to a first conductor lead (16) and a second end connected to a second conductor lead (18) so as to be shared by the plurality of surge protection circuits (12a-12d). A common pair of series-connected rectifier diodes (D34, D35) has a first end also connected to the first conductor lead (16) and a second end also connected to the second conductor lead (18) so as to be shared by the plurality of surge protection circuits (12a-12d).
Abstract:
An assembly of a telecommunications module and at least one protection plug containing at least one protection component is characterized in that also the module itself contains at least one protection component.
Abstract:
Protection circuitry (16) for use with a modem is provided that detects excessive voltage between the tip (32) and ring (34) lines of a telephone subscriber loop when the modem is off-hook. When the over-voltage condition is detected, a switch (20) is active, creating a circuit path that directs current away from the DC-holding circuit (14) of the modem, thereby protecting the modem. The protection circuit (16) of the present invention may be implemented using a minimal number of simple and inexpensive components.
Abstract:
A protecting device for electric and electronic devices and appliances is provided. The device includes a housing which is mounted in combination: a signal input connection to the EMF surge protection unit (1), a protected output signal connection (2) from the EMF surge protection unit to the users at the protected zone, a logic unit (3) of decision for the signal galvanic connection or attenuation level by a switch (8), an assess Logic unit (6) adopted to evaluate the signal status or the signal usage status, the switch (8) for galvanic connection/attenuation level change from the incoming signal and protected zone signal and logic unit for the assessment of the input signal, define the conditions to pass a request to change mode.
Abstract:
A telephone and data communications line protection apparatus (10) is provided for protecting at least one telephone line pair. The telephone and data communications line protection apparatus (10) includes a housing (14) containing protection circuitry (22) for protecting at least one telephone line pair. The housing (14) includes a cavity (42) for receiving a terminal portion of an electrical grounding, earthing spring clip member (12). The protection circuitry includes an electrical grounding contact (48) extending into the housing cavity (42) for electrical and mechanical contact engagement with the terminal portion of the electrical grounding, earthing spring clip member (12). The electrical grounding, earthing spring clip member has a predetermined profile corresponding to the housing. The electrical grounding, earthing spring clip member includes an aperture to receiver a grounding wire (72).
Abstract:
A controllable crystal oscillator, producing a clock signal at a desired frequency, includes a voltage controlled crystal oscillator (110) producing a signal at a subharmonic of the desired frequency. The voltage controlled crystal oscillator is coupled to a first duty cycle corrector (120), which produces a signal having substantially a desired duty cycle. The first duty cycle corrector is coupled to a frequency multiplier (130), which produces a signal at substantially the desired frequency. The frequency multiplier, in turn, is coupled to a second duty cycle corrector (140). The second duty cycle corrector produces the clock signal at the desired frequency and having the desired duty cycle.
Abstract:
In examples of the embodiment, a surge-proof interface circuit (100) comprises a rectifier circuit (20) which is configured to produce a rectified rectifier output voltage at the rectifier output terminals (20c, 20d), in accordance with a rectifier input voltage at the rectifier input terminals (20a, 20b), and a Darlington circuit (30) which comprises at least two transistors (Q3, Q4). Said Darlington circuit (30) comprises a current path (35) which can be controlled on the output side in accordance with a control signal (62) and said current path (35) which can be controlled on the output side is coupled between the rectifier output connections (20c, 20d).
Abstract:
Ausführungsbeispiele der vorliegenden Erfindung umfassen eine spannungsfeste Schnittstellenschaltung (100) mit einer Gleichrichterschaltung (20), die ausgebildet ist, um in Abhängigkeit von einer an Gleichrichtereingangsanschlüssen (20a, 20b) anliegenden Gleichrichtereingangsspannung, an Gleichrichterausgangsanschlüssen (20c, 20d) eine gleichgerichtete Gleichrichterausgangsspannung bereitzustellen, und mit einer Darlingtonschaltung (30), die zumindest zwei Transistoren (Q3, Q4) aufweist, wobei die Darlingtonschaltung (30) einen in Abhängigkeit von einem Ansteuersignal (62) steuerbaren ausgangsseitigen Strompfad (35) aufweist, und wobei der ausgangsseitige steuerbare Strompfad (35) zwischen die Gleichrichterausgangsanschlüsse (20c, 20d) gekoppelt ist.
Abstract:
The present invention relates to a connection device for telephone and data communications, which comprises a telephone port (P 1) for connecting a telephone cable coming from a telecommunications exchange (TEX, DEX), a data port (P5) for connecting a data cable of a data network, a telephone circuit section (TS) adapted to handle telephone communications, which is electrically connected (ClT) to the telephone port (Pl), a data circuit section (DS) adapted to handle data communications, which is electrically connected (ClD, ClT) to both the telephone port (P l) and the data port (P5); the device further comprises insulating means (P2, P3, P4, P7, IS) adapted to provide galvanic insulation between the circuit sections (TS, DS).
Abstract:
A circuit for protecting telephone/modem equipment from damage, includes a source of a subscriber telephone signal. An energy transfer device is coupled to the subscriber telephone signal source and an inductor coupled between the energy transfer device and the telephone/modem equipment.