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					                                                      Project: D086
IPC Revision WG – Definition Project
                                                      Subclass: H04M
SE
Rapporteur Proposal                                   Date : 14/7/06


Title - H04M
Telephonic Communication

Definition statement
This subclass covers:

Telecommunication systems including subscriber equipment and exchanges;
Interconnection arrangements between switching centres;
Interconnection arrangements not involving centralized switching;
Telephonic communication systems combined with other electrical systems;
Testing arrangements peculiar to telephonic communication systems;
Metering arrangements;
Time-controlling arrangements;
Time-indicating arrangements;
Party line systems;
Prepayment telephone systems;
Current supply arrangements for telephone systems
Relationship between large subject matter areas

With regard to mobile telephony, H04M covers communication systems using wireless
extensions, i.e. wireless links without selective communication, e.g. cordless telephones,
which are covered by group H04M1/72, whereas H04Q 7/00 covers communication networks
for selectively establishing one or a plurality of wireless communication links between a
desired number of users or between users and network equipments, for the purpose of
transferring information via these wireless communication links.

With regard to VoIP (Voice over Internet Protocol), voice is considered in this context to be a
specific form of "digital information". Since the Internet Protocol and IP networks are
classified in H04L (H04L 12/00, Data switching networks and H04L29/02, Communication
control), the transmission of voice over IP networks should be classified in H04L.

When VoIP is used to emulate or simulate services, the service, as presented to the user, is
still classified in H04M. (Any implementation details are however classified in H04L.) E.g
SPIT & SPAM prevention in VoIP should be classified in H04M 1/663.

References relevant to classification in this subclass
This subclass does not cover:




Informative references
Attention is drawn to the following places, which may be of interest for search:



    Counting mechanisms                                                 G06M
    Order telegraphs, fire or police telegraphs                         G08B
    Visual telegraphy                                                   G08B, G08C
    Teleautographic systems                                             G08C
    Multiplex transmission between switching centres                    H04J
    Selecting                                                           H04Q
    Transducers                                                         H04R
Special rules of classification within this subclass
NONE.


Glossary of terms
In this subclass, the following terms or expressions are used with the meaning indicated:

    Subscriber                   General term for terminal equipment, e.g. telephone for
                                 public use.
    Substation                   Subscriber or monitoring equipment which may connect
                                 a single subscriber to a line without choice as to
                                 subscriber.
    Satellite                    A kind of exchange the operation of which depends
                                 upon control signals received from a supervisory
                                 exchange.
    Switching centres            Include exchanges and satellites.




Title - H04M 1/00
Substation equipment, e.g. for use by subscribers


Definition statement
This group covers:

Substation equipment, e.g. for use by subscribers;
Constructional details of telephone sets;
Arrangements for indicating or recording called number or number of calling
subscriber at the substation equipment;
Arrangements for answering calls and for recording messages and conversations at the
substation equipment;
Substation extension, e.g. cordless telephones;
Arrangements for testing;
User guidance features in telephone sets;
Arrangements for testing.



Relationship between large subject matter areas
Arrangements for services at the substation equipment are classified here. Arrangements for
services at exchanges are classified at H04M 3/00.

References relevant to classification in this group
This group does not cover:

    Subscriber services or facilities provided at exchanges              H04M 3/00
    Prepayment telephone coin boxes                                      H04M 17/00
    Current supply arrangements                                          H04M 19/08
    SPIT and SPAM prevention in telephony                                H04M 1/663



Informative references
Attention is drawn to the following places, which may be of interest for search:



    In-vehicle arrangements for holding or mounting articles, e.g. for   B60R 11/02
    telephones, radios and TV sets
    Devices specially adapted or mounted for storing and repeatedly      B65H 75/34
    paying-out and restoring lengths of material
    Telephone cabinets                                                   E04H 1/14
    Measuring electric values                                            G01R
    Arrangements for converting discrete items of information into a     G06F 3/023
    coded form, e.g. keyboard
    Interaction techniques for graphical user interfaces between user    G06F 3/048
    and computer
    Digital output to display                                            G06F 3/14
    Housing or supporting of instruments or other apparatus              G12B 9/00
                                                                         H02G 11/00
    Keyboard switches in general                                         H01H 13/70,
                                                                         H03K 17/94
    Coding in connection with keyboards or like devices in general       H03M 11/00
   Hybrid circuits for carrier-frequency operation                     H04B 1/00
   Repeater circuits                                                   H04B 3/38
   Verifying user identity or authority in secret or secure digital    H04L 9/32
   communications
   Subscriber services or facilities provided at exchanges             H04M 3/00
   Simultaneous speech and data transmission                           H04M 11/06
   Mobile substation equipment in mobile radio system                  H04Q 7/32
   Details of transducers in general                                   H04R 1/00
   Testing transducers                                                 H04R 29/00
   Casing, cabinets or drawers for electric apparatus                  H05K 5/00




Special rules of classification within this group
NONE.




Title - H04M 3/00
Automatic and semi-automatic exchanges

Definition statement
This group covers:


Relationship between large subject matter areas
Services etc. which are arranged for use in substation equipment are classified in H04M 1/00
whereas services arranged for use in the exchange are classified in H04M 3/00. Exchanges in
and services specially provided for mobile radio systems are classified in H04Q 7/20 - H04Q
7/38.

References relevant to classification in this group
This group does not cover:

   Switching centres and exchanges in mobile, cellular systems         H04Q 7/20
    Selecting arrangements                                              H04Q 3/00 to
                                                                        H04Q 7/00,
                                                                        H04Q 11/00



Informative references
Attention is drawn to the following places, which may be of interest for search:




Special rules of classification within this group
NONE.


Title - H04M 5/00
Manual exchanges

Definition statement
This group covers:


Relationship between large subject matter areas



References relevant to classification in this group
This group does not cover:
Informative references
Attention is drawn to the following places, which may be of interest for search:



    Jacks, jack-plugs                                                   H01R 24/04
    Substation equipment in general                                     H04M 1/00




Special rules of classification within this group
NONE.




Title - H04M 7/00
Interconnection arrangements between switching centres

Definition statement
This group covers:


Relationship between large subject matter areas



References relevant to classification in this group
This group does not cover:




Informative references
Attention is drawn to the following places, which may be of interest for search:
    Transmission arrangements in general                                H04B




Special rules of classification within this group
NONE.


Title - H04M 9/00
Interconnection arrangements not involving centralised switching

Definition statement
This group covers:


Relationship between large subject matter areas



References relevant to classification in this group
This group does not cover:




Informative references
Attention is drawn to the following places, which may be of interest for search:



    Echo cancellers                                                     H04B 3/23




Special rules of classification within this group
NONE.
Title - H04M 11/00
Telephonic communication systems adapted for combination with other
electrical systems

Definition statement
This group covers: e.g. combinations with application servers, physical implementation of
xDSL-systems (splitters, modems, DSLAMs) (H04M 11/06)".


Relationship between large subject matter areas



References relevant to classification in this group
This group does not cover:




Informative references
Attention is drawn to the following places, which may be of interest for search:



    Alarm systems in general                                            G08B
    Transmission of digital information                                 H04L
    Broadcast communication                                             H04H




Special rules of classification within this group
NONE.
Title - H04M 13/00
Party-line systems

Definition statement
This group covers:


Relationship between large subject matter areas
NONE


References relevant to classification in this group
This group does not cover:




Informative references
Attention is drawn to the following places, which may be of interest for search:



    Substation equipment                                                H04M 1/00
    Exchange equipment, automatic, manual                               H04M 3/00,
                                                                        H04M 5/00
    Metering arrangements                                               H04M 15/36




Special rules of classification within this group
NONE.




Title - H04M 15/00
Metering arrangements;

Time-controlling arrangements;

Time-indicating arrangements
Definition statement
This group covers:




Relationship between large subject matter areas



References relevant to classification in this group
This group does not cover:




Informative references
Attention is drawn to the following places, which may be of interest for search:


Special rules of classification within this group
NONE.




Title - H04M 17/00
Prepayment telephone systems
Definition statement
This group covers:


Relationship between large subject matter areas



References relevant to classification in this group
This group does not cover:

    Coin-freed or like apparatus in general                             G07F
    Preventing unauthorized calling from a telephone set by inserting   H04M 1/675
    a coded card




Informative references
Attention is drawn to the following places, which may be of interest for search:



    Mobile subscriber equipment                                         H04Q 7/32
    Charging arrangements in digital switching networks                 H04L 12/14




Special rules of classification within this group
NONE.




Title - H04M 19/00
Current supply arrangements for telephone systems
Definition statement
This group covers:


Relationship between large subject matter areas



References relevant to classification in this group
This group does not cover:



    Current supply for selection equipment                              H04Q 1/28
    Battery saving arrangements for cordless phones                     H04M 1/73




Informative references
Attention is drawn to the following places, which may be of interest for search:




Special rules of classification within this group
NONE.

				
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