Digital added main line system with power-up and power-down features

• US 5,627,833 A
• Filed: 11/03/1995
• Issued: 05/06/1997
• Est. Priority Date: 07/25/1989
• Status: Expired due to Term

• 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:
  US08/552,991
• Time in Patent Office: 550 Days
• Field of Search: 370/37, 370/110.1, 370/110.2, 370/110.3, 370/112, 370/118, 375/286, 375/288, 375/240, 379/90, 379/93, 379/94, 379/156, 379/176, 379/318, 379/324, 379/333, 379/334, 379/373, 379/375, 379/377, 379/381, 379/383, 379/387, 379/399, 379/32, 379/58, 379/268, 379/413, 455/38.3, 455/343
• US Class Current: 370/464
• 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 for powering a system for transmitting and receiving multiple telephone transmission signals over a single twisted pair. The method also powers down a portion of the system. 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. A method for powering a system providing multiple telephone line service over a single twisted pair, said method comprising:

installing the system, the system including master equipment at a first location coupled through said single twisted pair to a remote terminal at a second location, the system using signals from the group consisting of 2B1Q and 4B3T to provide multiple telephone line service over the single twisted pair;

receiving power from telephone company equipment at the first location;

using the power for master equipment operation;

transmitting the power across said single twisted pair to the second location;

using the power for remote equipment operation; and

powering down a portion of the remote terminal when;

the system is not in a ring stop mode,

and a ring request is made,

and a line is off-hook;

or

the system is not in a ring stop mode,

and a ring request is not made,

and the line is not in a ring active mode, and the line is not off-hook.

2. The method of claim 1 wherein said system maintains line power within prescribed limits.

3. The method of claim 2 wherein said prescribed limits comprise TR-TSY-000057 standard AII in standby mode and AAIII during active line use.

4. The method of claim 3 wherein said single twisted pair has a length of at least 15,000 feet.

5. The method of claim 3 wherein said telephone company equipment comprises a local switch or central office.

6. The method of claim 5 wherein the portion of the remote terminal converts between analog and digital.

7. The method of claim 5 wherein the portion of the remote terminal comprises a SICOFI.

8. The method of claim 3 wherein the power is provided from a 48-volt power supply from a local switch.

9. The method of claim 1 further comprising the step of powering up the portion of the remote terminal when:

the system is not in a ring stop mode,

and the ring request is not made,

and the line is not in a ring active mode,

and a line is off-hook.

10. The method of claim 9 wherein said single twisted pair has a length of at least 20,000 feet.

11. The method of claim 1 wherein another portion of the remote terminal serves to increase power available for utilization by subscriber equipment.

12. The method of claim 11 wherein said another portion comprises subscriber line interface circuits.

13. The method of claim 12 wherein the remote terminal utilizes CMOS-based devices so as to reduce power consumption in the remote terminal.

14. The method of claim 11 wherein the subscriber equipment comprises telephones.

15. The method of claim 14 wherein the second location comprises a home or office.