(0)H04Q:0/2:
IPC6
SECTION H - ELECTRICITY
SELECTING
H04Q
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<<   >>   H04Q001/00 - H04Q001/56  

H 04 Q

 SELECTING (switches, relays, selectors H 01 H; electronic switches H 03 K 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.

 

 

 
 

 1
/ 00 Details of selecting apparatus or arrangements (details of selector switches H 01 H 63/00)

1
/ 02 • Constructional details  

1
/ 04 • • Frames or mounting racks for selector switches; Accessories therefor, e.g. frame cover  

1
/ 06 • • Cable ducts or mountings specially adapted for exchange installations (in general H 02 G)  

1
/ 08 • • Frames or mounting racks for relays; Accessories therefor  

1
/ 10 • • Exchange station construction  

1
/ 12 • • Arrangements of multiple bars with or without pivotable frames  

1
/ 14 • • Distribution frames  

1
/ 16 • • Wiring arrangements for selector switches or relays in frames  

1
/ 18 • Electrical details  

1
/ 20 • • Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles  

1
/ 22 • • • Automatic arrangements  

1
/ 24 • • • • for connection devices  

1
/ 26 • • • • for signalling trouble in unoccupied sub-exchanges  

1
/ 28 • • Current-supply circuits or arrangements for selection equipment at exchanges  

1
/ 30 • • Signalling arrangements; Manipulation of signalling currents (multiplex systems providing for calling or supervisory signals H 04 J 1/14, H 04 J 3/12; telephone substation equipment H 04 M 1/00)  

1
/ 32 • • • using trains of dc pulses (H 04 Q 1/39 takes precedence) [3]  

1
/ 34 • • • • Impulse regenerators with mechanical or other non-electrical marking arrangements  

1
/ 36 • • • • Pulse-correcting arrangements, e.g. for reducing effects due to interference  

1
/ 38 • • • using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors  

1
/ 39 • • • using coded pulse groups [3]  

1
/ 40 • • • whereby duration of pulse or interval between two pulses is variable  

1
/ 42 • • • • involving the position of a pulse in a cycle  

1
/ 44 • • • using ac (H 04 Q 1/50 takes precedence) [3]  

1
/ 442 • • • • with out-of-voice band signalling frequencies [3]  

1
/ 444 • • • • with voice-band signalling frequencies [3]  

1
/ 446 • • • • • using one signalling frequency (H 04 Q 1/46 takes precedence) [3]  

1
/ 448 • • • • • • with conversion of a single frequency signal into a digital signal [3]  

1
/ 45 • • • • • using multi-frequency signalling (H 04 Q 1/46 takes precedence) [3]  

1
/ 453 • • • • • • in which m-out-of-n signalling frequencies are transmitted [3]  

1
/ 457 • • • • • • with conversion of multi-frequency signals into digital signals [3]  

1
/ 46 • • • • • comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current [3]  

1
/ 48 • • • Induced-current signalling arrangements  

1
/ 50 • • • Conversion between different kinds of signals  

1
/ 54 • • Amplifier switched-on automatically in dependence on automatically selected lines  

1
/ 56 • • Balancing circuitry switched-on automatically in dependence on automatically selected lines  
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