GB2338368A - Quad subscriber line interface circui - Google Patents
Quad subscriber line interface circui Download PDFInfo
- Publication number
- GB2338368A GB2338368A GB9808831A GB9808831A GB2338368A GB 2338368 A GB2338368 A GB 2338368A GB 9808831 A GB9808831 A GB 9808831A GB 9808831 A GB9808831 A GB 9808831A GB 2338368 A GB2338368 A GB 2338368A
- Authority
- GB
- United Kingdom
- Prior art keywords
- module
- quad
- telephone
- subscriber line
- line interface
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/005—Interface circuits for subscriber lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/02—Constructional details
- H04Q1/028—Subscriber network interface devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/02—Constructional details
- H04Q1/03—Power distribution arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/02—Constructional details
- H04Q1/035—Cooling of active equipments, e.g. air ducts
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0435—Details
- H04Q11/0442—Exchange access circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
A quad subscriber line interface circuit 1 in a single self contained module that couples a four channel analog to digital conversion device such as a CODEC 4 to four telephone lines 3. It is required to supply and regulate the operating current as well as allowing the transmission of voice and data signals between the line terminating equipment 2 e.g. telephones, modems etc. and the network access equipment e.g. PABX, central office, ISDN terminal adapter, of a telephone network. The module includes connection pods (fig 4., 7) which allow the module to be electrically connected to the rest of the system. Locating holes (8) are shown on either side of the module and can be used to hold the module in a suitable socket. A thermally conductive coating may also be provided in order to dissipate the heat generated in supplying power to the line terminals 2.
Description
1 QUAD SUBSCRIBER LINE INTERFACE CIRCUIT This invention relates to a quad
subscriber line interface circuit for coupling an analog to digital conversion device such as a CODEC to a telephone Iffie.
2338368 A subscriber line interface circuit (SLIC) is required to couple an analog to dialtal coderldecoder (CODEC) to a telephone line so as to allow the transmission of voice and data signals between the line terminatine, equipment e.g. telephone, modem etc. and the network access equipment e.g. PABX, central office, ISDN terminal adapter, of a telephone network. In addition to signal transmission the SLIC must also provide the voltages, currents and logic levels required for the correct operation of the line terminating equipment. In the case of a telephone the SLIC would provide functions such as the power necessary for the phone to operate, the high C1 voltage required to ring the telephone bell, signaling to indicate the t> C subscriber has picked up the telephone handset, transmission of high frequency tones used for tolling and other similar functions that might be particular to certain applications.
2 SLIC's have traditionally been manufactured as a collection of discrete components such as amplifiers, transformers, transistors, resistors and capacitors placed directly onto the line card within the network access equipment. Alternatively they have been fabricated as integrated circuits on silicon, or even ceramic substrates being used in some cases. Due to high power dissipation requirements and manufacturing complexity it has been impossible to date to produce a four channel (quad) subscriber line interface circuit 'm a single module.
It is an object of the invention to provide a novel quad SLIC in a single module that provides a particularly cost effective solution.
According to the present invention there is provided a single electronic module that provides the necessary amplification and filtering of the analog signals that are transmitted in both directions between four analog to dialtal conversion channels within network terminating equipment and four separate telephone lines. The single module also supplies, regulates and dissipates the power needed to enable four line ternimiating devices to operate simultaneously. The single module also provides the high voltage and low voltage signaling functions that are required simultaneously 3 between four line terminating devices and the networkterminating equipment.
In order that the invention be more fully understood a specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing in which: Figure 1 is a general diagram showing the positioning of the quad SLIC between the four telephone lines and the analog to digital converter in a typical telephone equipment architecture. Figure 2 is a block diagram of the quad SLIC Figure 3 shows detailed signal connections between the devices; and Figure 4 shows a typical mechanical outline of a unit.
Refering to figure 1 each quad SLIC module 1 interfaces to four line termination units 2 (in this case shown as telephones) via four pairs of telephone wires 3. On the other side it connects to four analog to digital conversion channels 4 within the telephone equipment. The quad SLIC provides all the voltage, current and signals for the terminating units 2 to function correctly within a telecommunications network.
4 Figure 2 shows a block diagram of the four separate SLIC's 5 within the complete module 1. Each of these blocks represents electronic circuitry that performs the SLIC functions. Figure 3 shows four line termination units 2 connected via telephone wires 3 to the quad SLIC module 1. This is in turn connected via four sets of signalffig connections 6 to a typical four channel CODEC 4 that performs the analog to digital conversion functions. Figure 4 shows the mechanical outline of a typical module that would contain the electronic circuitry of the quad SLIC. The connection pads 7 are shown at the bottom these would allow electrical connection from the module to the rest of the system. Locatmig holes 8 are shown on either side of the module, these can be used to hold the module into a suitable socket.
CLAMS 1. A single self contained electronic module offering the functionality required to Miterface four telephone lines to four analog to digital conversion channels for the transmission of voice, data and logic signals between any Iffle terminating unit and the telephone network.
Claims (1)
- 2. An electronic module as claimed in Claim 1 wherein the module has theability to supply, regulate and dissipate the power needed for the correct operation of four line termination units.3. An electronic module as claimed in Claim 1 or Claim 2 wherein a thermally conductive coating may be used to dissipate the heat generated 'm providing the power needed for the correct operation of c four line termination units.4. An electronic module according to any previous claim, wherein the module has the ability to supply the voltages and currents needed for the correct operation of four Iffie termination units 5. An electronic module according to any previous claim, wherein the module can be connected to another electronic circuit by means of a socket.plug, connector, connecting pins, wire or any similar connection technique.6 6. An electronic module substantially as described herein with reference to Figures 1-4 of the accompanymic, drawmig.t> a
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9808831A GB2338368A (en) | 1998-04-27 | 1998-04-27 | Quad subscriber line interface circui |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9808831A GB2338368A (en) | 1998-04-27 | 1998-04-27 | Quad subscriber line interface circui |
Publications (2)
Publication Number | Publication Date |
---|---|
GB9808831D0 GB9808831D0 (en) | 1998-06-24 |
GB2338368A true GB2338368A (en) | 1999-12-15 |
Family
ID=10830964
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9808831A Withdrawn GB2338368A (en) | 1998-04-27 | 1998-04-27 | Quad subscriber line interface circui |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2338368A (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2208567A (en) * | 1987-07-31 | 1989-04-05 | Toshiba Kk | Hybrid printed circuit board |
GB2222056A (en) * | 1988-08-15 | 1990-02-21 | Mitel Corp | Line card with distributed signaling voltages |
EP0404063A2 (en) * | 1989-06-19 | 1990-12-27 | Oki Electric Industry Company, Limited | Subscriber line interface circuit in a switching system |
WO1998000944A2 (en) * | 1996-07-01 | 1998-01-08 | Advanced Micro Devices, Inc. | Test detection apparatus and method |
-
1998
- 1998-04-27 GB GB9808831A patent/GB2338368A/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2208567A (en) * | 1987-07-31 | 1989-04-05 | Toshiba Kk | Hybrid printed circuit board |
GB2222056A (en) * | 1988-08-15 | 1990-02-21 | Mitel Corp | Line card with distributed signaling voltages |
EP0404063A2 (en) * | 1989-06-19 | 1990-12-27 | Oki Electric Industry Company, Limited | Subscriber line interface circuit in a switching system |
WO1998000944A2 (en) * | 1996-07-01 | 1998-01-08 | Advanced Micro Devices, Inc. | Test detection apparatus and method |
Also Published As
Publication number | Publication date |
---|---|
GB9808831D0 (en) | 1998-06-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |