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Details of selecting apparatus or arrangements for establishing connections among stations for the purpose of transferring information via these connections
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Industry
CPC
H04Q1/00
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Parent Industries
H
ELECTRICITY
H04
Electric communication
H04Q
SELECTING
Current Industry
H04Q1/00
Details of selecting apparatus or arrangements for establishing connections among stations for the purpose of transferring information via these connections
Sub Industries
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Constructional details
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using pivoting mechanisms for accessing the interior of the apparatus
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using sliding mechanisms for accessing the interior of the apparatus
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Cabinets
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characterized by door details
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Subscriber network interface devices
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Power distribution arrangements
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power failure protection
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Cooling of active equipments
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Frames or mounting racks for selector switches Accessories therefor
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Cable ducts or mountings specially adapted for exchange installations
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vertical management arrangements
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horizontal management arrangements
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arranged on the front side
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arranged on the rear side
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Frames or mounting racks for relays Accessories therefor
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Frames or mounting racks not otherwise provided for
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Exchange station construction
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Protection against environment
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mechanical protection
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flooding protection
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lightning or EMI protection
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heat or sun protection
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Arrangements of multiple bars with or without pivotable frames
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Patch panels for monitoring, interconnecting or testing circuits
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being pivotable
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being slidable
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characterized by patch cord details
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having patch field management or physical layer management arrangements
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using RFID
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Distribution frames
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Details of connexions between cable and distribution frame
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Terminal blocks for distribution frames
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with contacts on circular surface
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Plugs used in distribution frames
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with switches arranged in a matrix configuration
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with line protection means
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using robots for distributing
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Identification strips for distribution frames
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Wireguides in connector blocks
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Backplane arrangements
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characterised by connection features
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Wiring arrangements for selector switches or relays in frames
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Electrical details
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Testing circuits or apparatus Circuits or apparatus for detecting, indicating, or signalling faults or troubles
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Automatic arrangements
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for connection devices
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in time-division multiplex systems
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for signalling trouble in unoccupied sub-exchanges
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Current-supply circuits or arrangements for selection equipment at exchanges
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Signalling arrangements Manipulation of signalling currents
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using trains of dc pulses
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Impulse regenerators with mechanical or other non-electrical marking arrangements
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Pulse-correcting arrangements
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using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors
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using coded pulse groups
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whereby duration of pulse or interval between two pulses is variable
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involving the position of a pulse in a cycle
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using alternate current
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with out-of-voice band signalling frequencies
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using one signalling frequency
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using two or more signalling frequencies, transmitted in succession or simultaneously
H04Q1/444
with voice-band signalling frequencies
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using one signalling frequency
H04Q1/4465
the same frequency being used for all signalling information
H04Q1/448
with conversion of a single frequency signal into a digital signal
H04Q1/4485
which is transmitted in digital form
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using multi-frequency signalling
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in which m-out-of-n signalling frequencies are transmitted
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with an additional signal transmitted for voice protection
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with conversion of multifrequency signals into digital signals
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which are transmitted in digital form
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comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency
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Induced-current signalling arrangements
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Conversion between different kinds of signals
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Amplifier switched-on automatically in dependence on automatically-selected lines
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Balancing circuitry switched-on automatically in dependence on automatically-selected lines
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