Digital added main line system

• US 5,459,730 A
• Filed: 01/27/1995
• Issued: 10/17/1995
• Est. Priority Date: 07/25/1989
• Status: Expired due to Fees

• Current Assignee: Terayon Communications Systems Incorporated (Motorola Solutions, Inc.)
• Original Assignee: Raychem Limited (TE Connectivity Limited)
• Inventors: Bliven, David C.
• Primary Examiner(s): Kizou, Hassan
• Application Number:
  US08/378,800
• Time in Patent Office: 263 Days
• Field of Search: 370/37, 370/77, 370/84, 370/110.1, 370/112, 370/118, 375/240, 375/286, 375/288, 375/289, 379/90, 379/93, 379/94, 379/106, 379/156, 379/167, 379/176, 379/387, 379/402, 379/399, 379/27, 455/38.3, 455/343, 341/126, 341/144
• US Class Current: 370/465
• CPC Class Codes: H04J 3/18 using frequency compression and subsequent expansion of the individual signals
• CPC Class Codes: H04M 11/068 using time division multiplex techniques; integrated services digital networks H04Q11/0428
• CPC Class Codes: H04Q 11/0428 Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
• CPC Class Codes: H04Q 11/0471 Terminal access circuits
• CPC Class Codes: H04Q 2213/034 Codec; PCM compression
• CPC Class Codes: H04Q 2213/09 Subscriber related equipment; Analog terminal
• CPC Class Codes: H04Q 2213/099 Loop multiplexer (not ISDN BRI/PRI; not 381), e.g. loop splitter
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/1305 Software aspects
• CPC Class Codes: H04Q 2213/1308 Power supply
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13174 Data transmission, file transfer
• CPC Class Codes: H04Q 2213/1319 Amplifier, attenuation circuit, echo suppressor
• CPC Class Codes: H04Q 2213/13199 Modem, modulation
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13208 Inverse multiplexing, channel bonding, e.g. TSSI aspects
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/13292 Time division multiplexing, TDM
• CPC Class Codes: H04Q 2213/13297 Coupling different rates in TDM systems, data rate adaptation
• CPC Class Codes: H04Q 2213/1332 : Logic circuits
• CPC Class Codes: H04Q 2213/13322 : Integrated circuits
• CPC Class Codes: H04Q 2213/13367 : Hierarchical multiplexing, add-drop multiplexing
• CPC Class Codes: H04Q 2213/18 : Ringing
• CPC Class Codes: H04Q 2213/204 : ISDN protocol; ISO 7

Abstract

A method and apparatus for transmitting and receiving multiple telephone transmission signals over a single twisted pair. An analog signal from a local switching station is converted to an 80 kbits/sec signal for transmission over a twisted pair. A remote terminal converts the 80 kbits/sec signal back into a conventional analog signal for use in conventional telephone, facsimile or other related equipment.

Claims

1. In a system for transmission of a single analog signal from a telephone company location to a subscriber location over a twisted pair, a method of converting said system to a system for multiple signal transmission over said twisted pair comprising:

a) installing master equipment at said telephone company location, said master equipment;

i) inputting multiple incoming telephone company analog signals from said telephone company equipment and outputting multiple outgoing telephone company analog signals to said telephone company equipment;

ii) converting said multiple incoming telephone company analog signals to an outgoing telephone company higher-rate multiplexed binary signal and converting an incoming telephone company higher-rate multiplexed binary signal to said multiple outgoing telephone company analog signals; and

iii) converting said outgoing telephone company higher-rate multiplexed binary signal to a multiplexed outgoing 2B1Q signal and converting a multiplexed incoming 2B1Q signal to said incoming telephone company higher-rate multiplexed binary signal; and

iv) transmitting said multiplexed outgoing 2B1Q signal over said twisted pair to said subscriber location and receiving said multiplexed incoming 2B1Q signal; and

b) installing a remote terminal at said subscriber location, said remote terminal;

i) inputting said multiplexed outgoing 2B1Q signal from said twisted pair and outputting said multiplexed incoming 2B1Q signal on said twisted pair;

ii) converting said multiplexed outgoing 2B1Q signal to an outgoing subscriber higher-rate multiplexed binary signal and converting an incoming subscriber higher-rate multiplexed binary signal to said multiplexed incoming 2B1Q signal;

iii) converting said outgoing subscriber higher-rate multiplexed binary signal to multiple outgoing subscriber analog signals and converting multiple incoming subscriber analog signals to said incoming subscriber higher-rate multiplexed binary signal; and

iv) transmitting said multiple outgoing subscriber analog signals to said subscriber equipment and receiving said multiple incoming subscriber analog signals from said subscriber equipment.

2. The method as recited in claim 1, said remote terminal further converting said multiple outgoing subscriber analog signals from a four-wire format to a two-wire format and converting said multiple incoming subscriber analog signals from a two-wire format to a four-wire format.

3. The method as recited in claim 1 wherein said twisted pair is over 1,000 feet long.

4. The method as recited in claim 1 wherein said twisted pair is over 15,000 feet long.

5. The method as recited in claim 1, wherein said twisted pair is over 20,000 feet long.

6. The method as recited in claim 1, wherein said remote terminal is installed near the home or office.

7. The method as recited in claim 1 wherein said remote terminal is installed in the home or office.

8. The method as recited in claim 1 wherein said master terminal is installed at a local switch or central office.

9. The method as recited in claim 1 wherein said outgoing telephone company higher-rate multiplexed binary signal, said incoming telephone company higher-rate multiplexed binary signal, said outgoing subscriber higher-rate multiplexed binary signal, and said incoming subscriber higher-rate multiplexed binary signal are substantially 160 kbits/second signals.

10. The method as recited in claim 1 wherein said multiplexed outgoing 2B1Q signal and said multiplexed incoming 2B1Q signal are substantially 80 ksymbols/second signals.

11. The method as recited in claim 1, said remote terminal operating without a battery or other current source at said remote terminal.

12. The method as recited in claim 1, said remote terminal further powering down a portion of said remote terminal if a line is not in an active state.

13. The method as recited in claim 12, wherein said remote terminal and said master equipment maintain line power within limits proscribed by TR-TSY-000057 standard AII in a standby mode and AIII during active line use.

14. The method as recited in claim 1, wherein said method converts an existing system.

15. The method as recited in claim 1, wherein said multiple incoming telephone company analog signals, said multiple outgoing telephone company analog signals, said multiple outgoing subscriber analog signals, and said multiple incoming subscriber analog signals include voice signals and/or data signals.

16. The method as recited in claim 15, wherein said multiple incoming telephone company analog signals, said multiple outgoing telephone company analog signals, said multiple outgoing subscriber analog signals, and said multiple incoming subscriber analog signals further include alarm signals.