Composite interface apparatus for key telephone system

• US 6,445,931 B1
• Filed: 12/23/1999
• Issued: 09/03/2002
• Est. Priority Date: 12/26/1998
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Information & Communications Ltd. (LG Corporation)
• Inventors: Lee, Haeng Yeoun
• Primary Examiner(s): VO, NGUYEN THANH
• Application Number:
  US09/471,487
• Time in Patent Office: 985 Days
• Field of Search: 455/557, 455/422, 455/560, 455/554-555, 379/90.01, 379/198
• US Class Current: 455/555
• CPC Class Codes: H04M 3/005 Interface circuits for subscriber lines current supply H04M19/00 and subgroups; supervisory, monitoring or testing arrangements H04M3/22 and subgroups; in key telephone systems H04M9/006
• CPC Class Codes: H04M 3/007 Access interface units for simultaneous transmission of speech and data, e.g. digital subscriber line [DSL] access interface units DSL access multiplexers H04Q11/0478, and H04L12/2856

Abstract

A hybrid interface apparatus for a key telephone system is disclosed, which apparatus is capable of interfacing a data and voice communication between a terminal such as a key telephone, a mobile telephone, a computer, etc. and a key telephone system. The hybrid interface apparatus according to the present invention includes more than at least one key telephone unit, a main apparatus for connecting the key telephones, a personal computer, and a multi-module connected between the main apparatus and a key telephone unit, a mobile telephone and a personal computer for interfacing a wire-based communication, a wireless communication and a data communication.

Claims

1. A composite interface apparatus for a key telephone system, comprising:

at least one key telephone unit (KTU);

a main apparatus for connecting the at least one KTU;

a personal computer; and

a multi-module for mutually interfacing a wire-based communication, a wireless communication or a data communication by connecting the main apparatus, the at least one KTU, a mobile telephone and a personal computer to one module, wherein said multi-module includes;

first digital adapter subscriber loop (DASL) integrated circuit (IC) for transmitting and receiving a voice signal and data signal with the main apparatus in an alternate mark inversion (AMI) signal format;

second digital adapter subscriber loop (DASL) integrated circuit (IC) for transmitting and receiving a voice signal and a data signal with the KTU in an alternate mark inversion (AMI) signal format;

a radio frequency (RF) module for transmitting and receiving a high frequency signal with the mobile telephone;

a serial interface for transmitting and receiving a data with the PC;

first and second coder/decoder (CODEC) connected with the first and second DASL IC, respectively;

an analog switch connected with the first and second CODEC and RF module for switching a voice signal; and

a central processing unit (CPU) for searching a header information of a data signal outputted from the first DASL and controlling the analog switch.

2. The apparatus of claim 1, wherein a signal transmission between the multi-module and the mobile telephone is performed based on a MCA method of 40-channel.

3. The apparatus of claim 1, wherein said first and second DASL ICs transmit a voice signal through a B-channel using a 2B+D channel structure and transmit a data signal through a D-channel.

4. The apparatus of claim 1, wherein said first DASL IC allocates a voice signal of the KTU to one B-channel among the 2B+D channel and allocates a voice signal of the mobile telephone to the remaining one B-channel for thereby transmitting the signals to the main apparatus.

5. The apparatus of claim 1, wherein said analog switch switches a voice signal of the first CODEC to the second CODEC or the RF module in accordance with a control of the CPU or switches a voice signal of the RF module to the first CODEC.

6. The apparatus of claim 1, wherein said CPU carries a header information on each of the data signals from the second DASL IC, RF module and series interface and outputs the same to the first DASL IC for controlling the analog switch.

7. The apparatus of claim 1, wherein a data format transmitted from the main apparatus to the multi-module or from the multi-module to the KTU comprises:

a start bit of 4-bit;

a DATA 1 of 8-bit;

a DATA 2 and DATA 3 of 8-bit which are actual data; and

a parity bit of 4-bit for checking errors.

8. The apparatus of claim 7, wherein said DATA 1 is formed of

a header of 3-bit which represents one among the KTU, mobile telephone and PC;

and

a data of 5-bit which represents a data type.

9. The apparatus of claim 1, wherein a data format transmitted from the multi-module to the main apparatus or from the KTU to the multi-module comprises:

a start bit of 4-bit;

a DATA 1 of 8-bit;

a DATA 2 of 8-bit which is an actual data; and

a parity bit of 4-bit for checking errors.

10. The apparatus of claim 9, wherein said DATA 1 is formed of:

a header of 3-bit which represents one among the KTU, mobile telephone and PC; and

a data of 5-bit which represents a KTU ID, an ID of the multi-module and a destination of the PC.

11. A multi function module for a key telephone system, comprising:

first digital adapter subscriber loop (DASL) integrated circuit (IC) for transmitting and receiving a voice signal and a data signal with a main apparatus in an alternate mark inversion (AMI) signal format;

second digital adapter subscriber loop (DASL) integrated circuit (IC) for transmitting and receiving a voice signal and a data signal with a key telephone unit (KTU) in an alternate mark inversion (AMI) signal format;

a radio frequency (RF) module for transmitting and receiving a high frequency signal with a mobile telephone;

a serial interface for transmitting and receiving data with a Personal Computer (PC);

first and second coder/decoder (CODEC) connected with the first and second DASL ICs;

an analog switch connected between the first and second CODECs and the RF module for switching a voice signal of the first CODEC to the second CODEC and the RF module and switching the voice signals of the second CODEC and the RF module to the first CODEC; and

a Central Processing Unit (CPU) for searching a header information of the data signal outputted from the first DASL IC, controlling the analog switch, carrying a header information on the data signals which are outputted from the second DASL IC, the RF module, and the serial interface to the first DASL IC.

12. The apparatus of claim 11, wherein said first and second DASL ICs transmit a voice signal through the B-channel using the 2B+D channel structure and transmits a data signal through the D-channel.

13. The apparatus of claim 11, wherein a data format transmitted from the main apparatus to the multi-module or from the multi-module to the KTU is formed of;

a start bit of 4-bit;

a DATA 1 of 8-bit;

a DATA 2 and DATA 3 of 8-bit which are an actual data; and

a parity bit of 4-bit for checking errors.

14. The apparatus of claim 13, wherein said DATA 1 is formed of:

a header of 3-bit which represents one among the KTU, the mobile telephone and the PC; and

a data of 5-bit which represents a data type.

15. The apparatus of claim 11, wherein a data format transmitted from the multi-module to the main apparatus or from the KTU to the multi-module is formed of:

a start bit of 4-bit;

a DATA 1 of 8-bit;

a DATA 2 of 8-bit which is an actual data; and

a parity bit of 4-bit for checking errors.

16. The apparatus of claim 15, wherein said DATA 1 is formed of:

a header of 3-bit which represents one among the KTU, the mobile telephone and the PC; and

a data of 5-bit which represents a KTU ID, an ID of a multi-module, and a destination of the PC.

17. A multi function module for a key telephone system, comprising:

first digital adapter subscriber loop (DASL) integrated circuit (IC) for transmitting and receiving a voice signal and a data signal with a main apparatus in a prescribed signal format;

second digital adapter subscriber loop (DASL) integrated circuit (IC) for transmitting and receiving a voice signal and a data signal with a key telephone unit (KTU) in a prescribed signal format;

a radio frequency (RF) module for transmitting and receiving a high frequency signal with a mobile telephone;

an interface for transmitting and receiving data with a Personal Computer (PC);

first and second converters connected with the first and second DASL ICs;

a switch connected between the first and second converters and the RF module for switching a voice signal of the first converter to the second converter and the RF module and switching the voice signals of the second converter and the RF module to the first converter; and

a Central Processing Unit (CPU) for searching a header information of the data signal outputted from the first DASL IC, controlling the switch, carrying a header information on the data signals which are outputted from the second DASL IC, the RF module, and the interface to the first DASL IC.