GB2425223A - Switching apparatus for connection to a five point overvoltage protection socket in an exchange - Google Patents

Switching apparatus for connection to a five point overvoltage protection socket in an exchange Download PDF

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Publication number
GB2425223A
GB2425223A GB0605312A GB0605312A GB2425223A GB 2425223 A GB2425223 A GB 2425223A GB 0605312 A GB0605312 A GB 0605312A GB 0605312 A GB0605312 A GB 0605312A GB 2425223 A GB2425223 A GB 2425223A
Authority
GB
United Kingdom
Prior art keywords
pair
connection points
switching apparatus
overvoltage protector
electrical switching
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0605312A
Other versions
GB0605312D0 (en
GB2425223B (en
Inventor
Frank Gerwin Kaufhold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
United Technologists Europe Ltd
Original Assignee
United Technologists Europe Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by United Technologists Europe Ltd filed Critical United Technologists Europe Ltd
Publication of GB0605312D0 publication Critical patent/GB0605312D0/en
Publication of GB2425223A publication Critical patent/GB2425223A/en
Application granted granted Critical
Publication of GB2425223B publication Critical patent/GB2425223B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/02—Constructional details
    • H04Q1/14—Distribution frames
    • H04Q1/146—Distribution frames with line protection means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/70—Structural association with built-in electrical component with built-in switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
    • H01R13/6666—Structural association with built-in electrical component with built-in electronic circuit with built-in overvoltage protection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/18—Automatic or semi-automatic exchanges with means for reducing interference or noise; with means for reducing effects due to line faults with means for protecting lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/54—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/22—Bases, e.g. strip, block, panel
    • H01R9/24—Terminal blocks
    • H01R9/2425—Structural association with built-in components
    • H01R9/2441—Structural association with built-in components with built-in overvoltage protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13003—Constructional details of switching devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1308—Power supply
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1332—Logic circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

Electrical switching apparatus 22 is provided, for connection to a five point overvoltage protector socket on a standard telecommunications exchange wiring block. A conventional five point overvoltage protector socket comprises a first pair of connection points 3,4 for connecting a customer circuit 5,6, a second pair of connection points 7,8 for connecting telecommunications exchange equipment 10, and an earth connector 11 adapted to receive an overvoltage protector module (12,22). The first pair of connection points 3,4 is normally connected to the second pair 7,8 via a conventional overvoltage protector module. The electrical switching apparatus 22 of the present invention provides a third pair of electrical connection points 14,15 for connecting further telecommunications equipment 20 and switching means 25 adapted to be varied between a first state in which the first pair of connection points 3,4 is electrically connected to the second pair of connection points 7,8, and a second state in which the first pair of connection points 3,4 is connected to the third pair of connection points 14,15.

Description

Service Transfer Switch This invention relates to electrical switching
apparatus. In particular, it relates to electrical switching apparatus for use in a telecommunications exchange and adapted to enable telecommunications service providers to replace existing equipment with new equipment, with minimal or no loss of service. The invention further relates to a method of connecting new equipment to a telecommunications exchange using such electrical switching apparatus and to a telecommunications exchange incorporating such apparatus.
A typical telecommunications exchange supports an array of metallic pair circuits, each dedicated to an individual customer line. The customer metallic pair circuits are terminated on wiring blocks adapted to provide connectivity for around 100 customer lines. The telecommunications equipment within the telephone exchange is also terminated on wiring blocks via similar metallic pair circuits. By bridging the connection points between a customer metallic pair circuit and the telecommunications equipment metallic pair circuit, a given customer line can thus be connected to the required telecommunications equipment.
In addition to providing interconnection points for the customer line and telecommunications equipment metallic pair circuits, it is common for the wiring blocks also to be utilised for the location of overvoltage protectors (also known as lightning protectors). An overvoltage protector is required for each customer metallic pair circuit so as to protect the exchange equipment from induced voltages caused by lightening strikes or power surges. To facilitate connection of overvoltage protector modules, each customer metallic pair circuit is presented on an individual socket on the wiring block. Each socket comprises a first pair of connection points for the customer metallic pair circuit, a second pair of connection points for the telecommunications exchange equipment, and an earth connector for the overvoltage protector. Individual overvoltage protector modules are then plugged into each of these sockets. The overvoltage protector modules thus serve a dual purpose: to provide a metallic connection between the customer line metallic pair circuit and the metallic pair circuit connected to the telecommunications exchange equipment; and to provide an overvoltage discharge path to an earth connection for both the customer metallic pair circuit and the telecommunication exchange equipment metallic pair circuit.
Historically, the introduction of new generations of telecommunications equipment into the network has involved the manual rewiring of customer circuits onto the new equipment. This required the old and new telecommunications equipment to be connected in parallel for a limited time, following which the old equipment was physically and permanently disconnected. This is a highly labour intensive, time consuming and expensive process requiring large numbers of skilled technicians. A further drawback to this conventional method is that, in the event that the new telecommunications equipment is or becomes faulty, re-connection to the prior equipment cannot be established without reversing the entire process.
The present invention seeks to address the above problems by providing electrical switching apparatus adapted to enable service providers automatically to disconnect customer metallic pair circuits from existing telecommunications equipment and re-connect them to new telecommunications equipment, with minimal or no loss of service. The invention also seeks to provide a controlled line by line switching capability to enable the customer circuits to be temporarily or permanently reconnected to the prior telecommunications equipment should the need arise. Further, the invention seeks to obviate the need for additional wiring blocks for the new equipment, and the associated planning and installation costs.
According to a first aspect of the present invention, there is provided electrical switching apparatus for connection to a five point overvoltage protector socket on a standard telecommunications exchange wiring block, in which said five points comprise a first pair of connection points for connecting a customer circuit, a second pair of connection points for connecting telecommunications exchange equipment, and an earth connector adapted to receive an overvoltage protector module, and in which the first pair of connection points is normally connected to the second pair via said overvoltage protector module, which electrical switching apparatus comprises: - a third pair of electrical connection points for connecting further telecommunications equipment; and - switching means adapted to be varied between a first state in which the first pair of connection points is electrically connected to the second pair of connection points, and a second state in which the first pair of connection points is connected to the third pair of connection points.
The switching means may comprise a manually operated switch, or a relay. Preferably, the switching means is incorporated into a modified overvoltage protector module.
In a currently preferred embodiment of the present invention, the third pair of connection points is carried on a printed circuit board adapted to overlay the exchange wiring block. In this embodiment, the modified overvoltage protector module is preferably adapted to be removably engageable with the printed circuit board.
According to a second aspect of the present invention, there is provided a telecommunications exchange incorporating electrical switching apparatus as hereinbefore described. In this second aspect of the present invention it is particularly preferred that the printed circuit board is arranged so as substantially to overlay the entire wiring block, thereby providing a further pair of connecting pins to each overvoltage protector socket. Most preferably, the electrical switching apparatus further comprises a plurality of modified overvoltage protector modules adapted to engage with each overvoltage protector socket on the wiring block.
Each modified overvoltage protector module on the wiring block preferably comprises a relay and is electrically connectable via horizontal and vertical connectors to one or more like modified overvoltage protector modules located on adjacent overvoltage protector sockets, such that the operation of the relay between its first and second states is controllable by varying the polarity of the applied voltage.
According to a third aspect of the present invention there is provided a method of connecting new equipment to a telecommunications exchange, which method comprises the sequential steps of: (a) fitting to the telecommunications exchange, electrical switching apparatus as hereinbefore described; (b) connecting said new telecommunications equipment to the third pair of connection points on the electrical switching apparatus; and (c) operating the electrical switching apparatus so as to urge the switching means from its first state into its second state, thereby connecting the customer circuit to the new telecommunications equipment.
Where the connection of the customer circuit to the new telecommunications equipment is desired to be permanent - i.e. where the capability temporarily to switch the customer circuit back to the prior telecommunications equipment is not required, the method may further comprising the additional step of: (d) disconnecting the existing telecommunications equipment from the second pair of connection points by physically replacing the switching means with a simple metallic path connection exclusively between the first pair of connection points and the third pair of connection points.
It is envisaged that the present invention will find use particularly, though not exclusively, for the upgrading of telecommunications exchanges from normal (POTS) telephony equipment to broadband equipment, and where it is desired to switch over a large number of customer lines from existing to new telecommunications equipment with minimal or no loss of service. The capability to switch customer premises temporarily back to prior telecommunications equipment should the need arise is likely to prove particularly useful when new telecommunications equipment is or becomes faulty, since the customer service can be maintained whilst the fault is remedied, or even whilst the new telecommunications equipment is replaced.
In order that the present invention may be more fully understood, preferred embodiments thereof will now be discussed in detail, though only by way of example, with reference to the following drawings in which: Figure 1 shows a schematic representation of a conventional wiring block and a detail of a conventional overvoltage protector socket; Figure 2 shows the conventional overvoltage protector socket of Figure 1, with a conventional overvoltage protector module fitted thereto; Figure 3 shows a schematic representation of a printed circuit board overlay constituting part of the electrical switching apparatus of the present invention, and a detail of a modified overvoltage protector socket; Figure 4 shows a schematic representation of a single customer circuit featuring the modified overvoltage protector socket of Figure 3, with a modified overvoltage protector module, constituting a further part of the electrical switching apparatus of the present invention, fitted thereto; Figure 5 shows the modified overvoltage protector socket of Figure 3 with a further modified overvoltage protector module fitted; Figure 6 shows a schematic representation of a wiring block with a plurality of modified overvoltage protector modules fitted thereto, and a detail of a modified overvoltage protector module showing the relay connections; and Figure 7 shows a schematic representation of a wiring block with a plurality of modified overvoltage protector modules fitted thereto, illustrating the switching capability.
Referring first to Figure 1, there is shown a schematic representation of a conventional 100 line protected wiring block 1 in a telecommunications exchange. The wiring block 1 comprises 100 five point overvoltage protector sockets 2, each carrying an individual customer line metallic pair circuit 5 to enable a customer premises 6 to be connected to the exchange 1.
The customer metallic pair circuit 5 terminates at a first pair of connection contacts 3,4 on the overvoltage protector socket 2. The existing telecommunications exchange equipment 10 serving that customer premises 6 is also connected to the exchange 1 via a metallic pair circuit 9, which terminates at a second pair of connector contacts 7,8 on the overvoltage protector socket 2. An exchange earth connection is provided on a further contact 11 to enable the overvoltage protector (not shown in Figure 1) to discharge high voltage transients to ground.
Referring now to Figure 2, this shows the overvoltage protector socket 2 with a conventional overvoltage protector module 12 fitted thereto. The overvoltage protector module 12 establishes a first metallic path connection 41 between one contact 3 of the first pair of connector contacts and one contact 7 of the second pair of connector contacts; and establishes a second metallic path connection 42 between the other contact 4 of the first pair and the other contact 8 of the second pair of connector contacts. The customer premises 6 is thereby connect to the exchange equipment 10. The module 12 also provides overvoltage protection for both the customer premises metallic pair circuit 5,6 and the telecommunications exchange equipment metallic pair circuit 9,10 by establishing electrical connection 43 with the exchange earth connection contact 11.
Referring now to Figure 3, there is shown a printed circuit board overlay 13 constituting a component part of the electrical switching apparatus according to the present invention. The printed circuit board overlay 13 has holes 44 milled in it to fit over the existing pins 45 in the wiring block 1, and has additional pins 14,15 pressed into the printed circuit board 13. In use, when upgrading a telecommunications exchange according to a further aspect of the present invention, the printed circuit board 13 is placed on top of the wiring block 1. The resultant assembly 16 provides a third pair of connection contacts 14,15 for each thus-modified overvoltage protector socket 17.
This third pair of connection contacts 14,15 provides connectivity for the new telecommunications equipment 20 to be connected to each customer premises 6, as is best shown in Figure 4. The modified overvoltage protector socket 17 is now fitted with a modified overvoltage protector module 22 constituting a further component part of the electrical switching apparatus according to the present invention. The modified overvoltage protector module 22 incorporates a latching relay 25 and a three terminal overvoltage protector 24. The module 22 connects to the existing five pins 3,4,7,8,11 on the wiring block 1 and to the two additional pins 14,15 provided on the printed circuit board 13, which constitutes a third pair of connection contacts. The new telecommunications equipment 20 is connected to this third pair of connection contacts 14,15 via a further metallic pair circuit 21.
When the relay 25 is in its first state (not shown in Figure 4), a first metallic path connection (not shown in Figure 4) is established between one contact 3 of the first pair of connection contacts and one contact 7 of the second pair of connection contacts; and a second metallic path connection (not shown in Figure 4) is established between the other contact 4 of the first pair of connection contacts and the other contact 8 of the second pair of connection contacts. The customer premises metallic pair circuit 5,6 is thus connected to the existing telecommunications exchange equipment metallic pair circuit 9,10.
However, by operating the relay 25 so as to urge it into its second state, a first metallic path connection 46 is established between one contact 3 of the first pair of connection contacts and one contact 14 of the third pair of connection contacts; and a second metallic path connection 47 is established between the other contact 4 of the first pair of connection contacts and the other contact 15 of the third pair of connection contacts. The customer premises metallic pair circuit 5,6 is thus connected to the new telecommunications equipment metallic pair circuit 20,21. Should the need arise, the latching relay can be utilised to switch the customer premises 6 back and forth between the prior 10 and new 20 telecommunications equipment whenever required.
In certain circumstances, the connection to the new telecommunications equipment 20 is to be permanent, and the capability of switching back to the prior equipment 10 is not required. In this situation, once all customer circuits 5,6 have been successfully switched over to the new telecommunications - 10 - equipment 20, the modified overvoltage protector module 22 incorporating the relay 25 can be replaced by a simple overvoltage protector module 26, as is shown in Figure 5. As can be seen, the simple overvoltage protector module 26 establishes a first metallic path connection 48 between one contact 3 of the first pair of connection contacts and one contact 14 of the third pair of connection contacts; and establishes a second metallic path connection 49 between the other contact 4 of the first pair of connection contacts and the other contact 15 of the third pair of connection contacts. The second pair of connection contacts 7,8 and the metallic pair circuit 9 associated therewith remain disconnected, thereby completely isolating the prior telecommunications equipment 10.
Referring now to Figure 6, there is shown a preferred embodiment of the modified overvoltage protector module 22 incorporating the latching relay 25.
Four electrical contacts 30,31,32,33 are fitted to the four faces of the upper body of the overvoltage protector module 22. A first pair of contacts 30,31 are connected together to form a horizontal relay selection axis, whilst a second pair of contacts 32,33 are connected together to form a vertical relay selection axis.
The latching relay 25 is connected via lead 23a to the vertical relay selection axis defined by the second pair of contacts 32,33, and via lead 23b to the horizontal relay selection axis defined by the first pair of contacts 30,31.
When like modified overvoltage protector modules 22 are engaged on top of one another or in adjacent modified overvoltage protector sockets 17, the relay connection contacts 30,31,32,33 on one protector module 22 make an electrical connection with those on adjacent modules. -11 -
Referring now to Figure 7, this shows a modified wiring block 16, in which each modified overvoltage protector socket 17 is fitted with a modified overvoltage protector module 22. By applying a suitable voltage between any one of the x axis contacts 28a-28e and any one of the y axis contacts 27a to 27t, the latching relay 25 on the modified overvoltage protector module 22 at the grid location defined by the selected co-ordinates can be operated. The customer premises metallic pair circuit 5,6 associated with that grid location can thus be switched between the prior telecommunications equipment 10 and the new telecommunications equipment 20 as desired. For example, applying a suitable voltage between terminals 28c and 27j will cause the latching relay 25 on the modified overvoltage protector 22 located at the grid location 29 corresponding to the coordinates 28c,27j to change state. The polarity of the applied voltage will define whether the latching relay 25 operates or releases which in turn will connect either the new 20 or prior 10 telecommunications equipment. - 12-

Claims (15)

  1. Claims 1. Electrical switching apparatus for connection to a five point
    overvoltage protector socket on a standard telecommunications exchange wiring block in which said five points comprise a first pair of connection points for connecting a customer circuit, a second pair of connection points for connecting telecommunications exchange equipment, and an earth connector adapted to receive an overvoltage protector module, and in which the first pair of connection points is normally connected to the second pair via said overvoltage protector module; which electrical switching apparatus comprises: - a third pair of electrical connection points for connecting further telecommunications equipment; and - switching means adapted to be varied between a first state in which the first pair of connection points is electrically connected to the second pair of connection points, and a second state in which the first pair of connection points is connected to the third pair of connection points.
  2. 2. Electrical switching apparatus as claimed in claim 1, wherein the switching means comprises a manually operable switch.
  3. 3. Electrical switching apparatus as claimed in claim 1, wherein the switching means comprises a relay.
  4. 4. Electrical switching apparatus as claimed in any of claims 1 to 3 wherein the switching means is incorporated into a modified overvoltage protector module. - 13-
  5. 5. Electrical switching apparatus as claimed in any of the preceding claims wherein the third pair of connection points is carried on a printed circuit board adapted to overlay the exchange wiring block.
  6. 6. Electrical switching apparatus as claimed in claim 4 wherein the third pair of connection points is carried on a printed circuit board adapted to overlay the exchange wiring block, and wherein the modified overvoltage protector module is adapted to be removably engageable with the printed circuit board.
  7. 7. Electrical switching apparatus as claimed in claim 1 and substantially as hereinbefore described with reference to the accompanying drawings.
  8. 8. A telecommunications exchange incorporating electrical switching apparatus as claimed in any of the preceding claims.
  9. 9. A telecommunications exchange as claimed in claim 8, incorporating electrical switching apparatus as claimed in claim 5, and wherein the printed circuit board is arranged so as substantially to overlay the entire wiring block, thereby providing a further pair of connecting pins to each overvoltage protector socket.
  10. 10. A telecommunications exchange as claimed in claim 9, incorporating electrical switching apparatus as claimed in claim 6, and further comprising a plurality of modified overvoltage protector modules adapted to engage with each overvoltage protector socket on the wiring block.
  11. 11. A telecommunications exchange as claimed in claim 10, wherein each modified overvoltage protector module on the wiring block comprises a relay and is electrically connectable via horizontal and vertical connectors to a like modified overvoltage protector module located on an adjacent overvoltage - 14 - protector socket, such that the operation of the relay between its first and second states is controllable by varying the polarity of the applied voltage.
  12. 12. A telecommunications exchange as claimed in claim 8 and substantially as hereinbefore described with reference to the accompanying drawings.
  13. 13. A method of connecting new equipment to a telecommunications exchange, which method comprises the sequential steps of: (a) fitting to the telecommunications exchange, electrical switching apparatus as claimed in any of claims 1 to 7; (b) connecting said new telecommunications equipment to the third pair of connection points on the electrical switching apparatus; and (c) operating the electrical switching apparatus so as to urge the switching means from its first state into its second state, thereby connecting the customer circuit to the new telecommunications equipment.
  14. 14. A method as claimed in claim 13 further comprising the additional step of: (d) disconnecting the existing telecommunications equipment from the second pair of connection points by physically replacing the switching means with a simple metallic path connection exclusively between the first pair of connection points and the third pair of connection points.
  15. 15. A method as claimed in claim 13 and substantially as hereinbefore described with reference to the accompanying drawings.
GB0605312A 2005-03-18 2006-03-17 Service transfer switch Expired - Fee Related GB2425223B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB0505574.4A GB0505574D0 (en) 2005-03-18 2005-03-18 Service transfer switch

Publications (3)

Publication Number Publication Date
GB0605312D0 GB0605312D0 (en) 2006-04-26
GB2425223A true GB2425223A (en) 2006-10-18
GB2425223B GB2425223B (en) 2009-03-04

Family

ID=34531474

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB0505574.4A Ceased GB0505574D0 (en) 2005-03-18 2005-03-18 Service transfer switch
GB0605312A Expired - Fee Related GB2425223B (en) 2005-03-18 2006-03-17 Service transfer switch

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB0505574.4A Ceased GB0505574D0 (en) 2005-03-18 2005-03-18 Service transfer switch

Country Status (1)

Country Link
GB (2) GB0505574D0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2577060A (en) * 2018-09-11 2020-03-18 British Telecomm Adaptor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB724852A (en) * 1952-05-03 1955-02-23 Western Electric Co Improvements in or relating to party line telephone systems
GB2232310A (en) * 1989-03-31 1990-12-05 Gte Prod Corp Five pin protector module for telephone circuits
GB2366091A (en) * 2000-07-18 2002-02-27 Technetix Plc Switched dual telecommunication socket

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB724852A (en) * 1952-05-03 1955-02-23 Western Electric Co Improvements in or relating to party line telephone systems
GB2232310A (en) * 1989-03-31 1990-12-05 Gte Prod Corp Five pin protector module for telephone circuits
GB2366091A (en) * 2000-07-18 2002-02-27 Technetix Plc Switched dual telecommunication socket
GB2366093A (en) * 2000-07-18 2002-02-27 Technetix Plc Adapter for separating two telecommunication lines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2577060A (en) * 2018-09-11 2020-03-18 British Telecomm Adaptor
GB2577060B (en) * 2018-09-11 2022-01-12 British Telecomm Adaptor

Also Published As

Publication number Publication date
GB0605312D0 (en) 2006-04-26
GB0505574D0 (en) 2005-04-27
GB2425223B (en) 2009-03-04

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Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20100317