IPC 7 English version H04Q !A-H04Q 11/08

IPC ⁷ English version

H04Q-H04Q01108

SECTION H – ELECTRICITY

H 04

ELECTRIC COMMUNICATION TECHNIQUE

H 04 Q

SELECTING (switches, relays, selectors H01H; electronic switches H03K 17/00)

Notes

(1)

This subclass covers:

–

methods, circuits, or apparatus for establishing selectively a connection between a desired number of stations (normally two), or between a main station and a desired number of substations (normally one) for the purpose of transferring information via this connection after it has been established;

–

selective calling arrangements over connections already established. In either case, the connection may be by means of electric conductors or electromagnetic waves.

(2)

In this subclass, the following terms or expressions are used with the meanings indicated:

–

"subscriber" is a general term for terminal equipment, e.g. telephone for public use;

–

"substation" means a subscriber or monitoring equipment which may connect a single subscriber to a line without choice as to subscriber;

–

"satellite" is a kind of exchange the operation of which depends upon control signals received from a supervisory exchange;

–

"switching centres" includes exchanges and satellites.

Subclass Index

SELECTING ARRANGEMENTS

General; by line; via radio or inductive links; multiplex

H04Q 3/00; H04Q 5/00; H04Q 7/00; H04Q 11/00

DISPOSITIONS FOR TELECONTROL OR TELEMETRY

H04Q 9/00

DETAILS

H04Q 1/00

Details of selecting apparatus or arrangements (details of selector switches H01H 63/00)

Constructional details

Frames or mounting racks for selector switches; Accessories therefor, e.g. frame cover

Cable ducts or mountings specially adapted for exchange installations (in general H02G)

Frames or mounting racks for relays; Accessories therefor

Exchange station construction

Arrangements of multiple bars with or without pivotable frames

Distribution frames

Wiring arrangements for selector switches or relays in frames

Electrical details

Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles

Automatic arrangements

for connection devices

for signalling trouble in unoccupied sub-exchanges

Current-supply circuits or arrangements for selection equipment at exchanges

Signalling arrangements; Manipulation of signalling currents (multiplex systems providing for calling or supervisory signals H04J 1/14, H04J 3/12; telephone substation equipment H04M 1/00)

using trains of dc pulses (H04Q 1/39 takes precedence) [3]

Impulse regenerators with mechanical or other non-electrical marking arrangements

Pulse-correcting arrangements, e.g. for reducing effects due to interference

using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

using coded pulse groups [3]

whereby duration of pulse or interval between two pulses is variable

involving the position of a pulse in a cycle

using ac (H04Q 1/50 takes precedence) [3]

442

with out-of-voice band signalling frequencies [3]

444

with voice-band signalling frequencies [3]

446

using one signalling frequency (H04Q 1/46 takes precedence) [3]

448

with conversion of a single frequency signal into a digital signal [3]

using multi-frequency signalling (H04Q 1/46 takes precedence) [3]

453

in which m-out-of-n signalling frequencies are transmitted [3]

457

with conversion of multi-frequency signals into digital signals [3]

comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current [3]

Induced-current signalling arrangements

Conversion between different kinds of signals

Amplifier switched-on automatically in dependence on automatically selected lines

Balancing circuitry switched-on automatically in dependence on automatically selected lines

Selecting arrangements (H04Q 5/00 to H04Q 11/00 take precedence)

Circuit arrangements for selectors responsive to a permutation code

Circuit arrangements for receivers of routing digits

for group or trunk group selectors

for local or long-distance selectors

for PBX selectors, i.e. private branch exchange selectors

for line selectors providing transfer of routing digits

for two-way operation selectors

for marking-switches

Circuit arrangements for first stage of hunting switching

for preselectors

comprising common calling and disconnecting circuit

for line finders

comprising common calling and disconnecting circuit

comprising main groups and subgroups

Selector finders, i.e. allotters

Circuit arrangements for second or subsequent stages of hunting switching [2]

for the second preselection stage

for the second line-finder stage

for stages after the group-selector stage

for stages after the line selector, e.g. for extension selector

Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

using revertive control

using signals other than revertive impulses

using translators

using markers

for end-to-end marking

495

for routing connecting paths

using static devices in switching stages, e.g. electronic switching arrangements [2]

in which the logic circuitry controlling the exchange is centralised

545

using a stored programme [4]

using wired logic circuitry [4]

555

being comprised by electro-magnetic devices [4]

in which the control signals are multiplexed [2]

Arrangements providing connection between main exchange and sub-exchange or satellite

for connecting to satellites or concentrators which connect one or more exchange lines with a group of local lines

for connecting to private branch exchanges

Distributing or queuing

Traffic distributors

Grouping or interlacing selector groups or stages

Identification of class of calling subscriber

Finding out and indicating number of calling subscriber

Identification of subscriber calling from a party-line

Translation from the called subscriber's number to the outgoing or incoming control information [4]

Temporary storage of information of calling or called subscriber (intermediate storage means for telegraphic communication H04L 13/08) [4]

Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange

with direct connection for all subscribers, i.e. party-line system (H04Q 5/24 takes precedence)

Signalling by currents in one or other or both line wires or additional wires

Signalling by amplitude or polarity of dc

Signalling by continuous ac

using single frequencies for different subscribers

using combinations of frequencies

Signalling by pulses

by predetermined number of pulses

with indirect connection, i.e. through subordinate switching centre

the subordinate centre permitting interconnection of subscribers connected thereto

the subordinate centre not permitting interconnection of subscribers connected thereto

for two-party-line systems

Selecting arrangements to which subscribers are connected via radio links or inductive links

in which the radio or inductive links are essentially one-way, e.g. selective calling systems [6]

Selective calling networks, e.g. wide area paging [6]

Selective call encoders, i.e. equipment at paging centre or base station [6]

with acknowledge back capability [6]

Selective call receivers [6]

Selective call decoders [6]

Functional features associated with selective call operation, e.g. battery saving circuits, address code programming [6]

in which the radio or inductive links are two-way links, e.g. mobile radio systems [6]

using dedicated mobile switching centres, e.g. cellular systems [6]

using public exchanges or networks with at least partially integrated mobile switching or mobile application [6]

using a private branch exchange (PBX) as final selecting device, e.g. cordless PBX [6]

Trunked radio systems, i.e. sharing radio channel among active subscribers [6]

Base station equipment [6]

Mobile subscriber equipment [6]

Test or monitoring equipment [6]

Arrangements for mobile service area coverage, e.g. cells layout [6]

Arrangements for completing call to or from mobile subscriber [6]

Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom

Automatically-operated arrangements

Arrangements for synchronous operation

Calling by using amplitude or polarity of dc

Calling by using continuous ac

using single different frequencies

using combinations of frequencies

Calling by using pulses

by predetermined number of pulses

11/

Selecting arrangements for multiplex systems (multiplex systems H04J)

11/

for frequency-division multiplexing

11/

for time-division multiplexing

11/

Time-space-time switching [5]

11/

Time only switching [5]