Integrated echo canceling multiplexor

• US 5,148,426 A
• Filed: 06/08/1990
• Issued: 09/15/1992
• Est. Priority Date: 06/08/1990
• Status: Expired due to Fees

• Current Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Original Assignee: DSC Communications Corp. (Nokia Corporation)
• Inventors: Sopira, Terrence G., Yang, Paul P., Shenoi, Kishan
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Jung, Min
• Application Number:
  US07/535,123
• Time in Patent Office: 830 Days
• Field of Search: 370/32.1, 370/32, 370/112, 370/85.1, 375/8, 379/406, 379/410
• US Class Current: 370/286
• CPC Class Codes: H04B 3/23 using a replica of transmitted signal in the time domain, e.g. echo cancellers
• CPC Class Codes: H04J 3/14 Monitoring arrangements for SDH/SONET rings H04J3/085

Abstract

An integrated echo canceling multiplexor is provided which comprises an echo canceler for receiving DS1 signals for canceling echo in the DS1 signal and producing an echo-free digital logic signal. A first performance monitor is coupled to the echo canceler for receiving the echo-free digital logic signal and determining the quality of the signal. A multiplexor-demultiplexor is further coupled to the echo canceler for receiving the echo-free digital logic signal and producing a DS3 signal. Additionally, a second performance monitor is coupled to the multiplexor-demultiplexor and receives the DS3 signal and determines the quality of the signal.

Claims

1. An integrated echo canceling multiplexor, comprising:

an echo canceling circuit for receiving DS1 signals for canceling echo in said DS1 signals and producing echo-free digital logic signals;

a multiplex-demultiplexing circuit coupled to said echo canceling circuit for receiving said echo-free digital logic signals and producing DS3 signals; and

a performance monitor integrally coupled to said echo canceling circuit and said multiplex-demultiplexing circuit for determining the quality of said echo-free DS1 digital logic signals and said produced DS3 signals.

2. The integrated echo canceling multiplexor, as set forth in claim 1, further comprising a third performance monitoring circuit integrally coupled to said echo canceling circuit for determining the quality of said DS1 signal at the DS0 level.

4. The integrated echo canceling multiplexor, as set forth in claim 1, further comprising a second multiplex-demultiplexing circuit coupled to said echo canceling circuit for receiving DS3 signals and converting said DS3 signals to DS1 digital logic signals, and said echo canceling circuit receives said DS1 digital logic signals.

5. The integrated echo canceling multiplexor, as set forth in claim 4, further comprising a third performance monitoring circuit coupled to said second multiplex-demultiplexing circuit for receiving said DS1 digital logic signals and determining the quality of said DS1 signal.

6. The integrated echo canceling multiplexor, as set forth in claim 4, wherein said performance monitor further determines the quality of said DS3 signal received by said second multiplex-demultiplexing circuit.

3. The integrated echo canceling multiplexor, as set forth in claim 3, wherein said performance monitor further determines the quality of said DS1 signal by computing the noise, signal power and echo levels for each DS0 channel.

7. An integrated echo canceling multiplexor, comprising:

first multiplex-demultiplexing circuit for receiving DS3 signals and converting said DS3 signals to DS1 digital logic signals;

an echo canceling circuit coupled to said first multiplex-demultiplexing circuit for receiving said DS1 digital logic signals and producing echo-free DS1 digital logic signals; and

a second multiplex-demultiplexing circuit coupled to said echo canceling circuit for receiving said echo-free DS1 digital logic signals and producing DS3 signals for transmission.

8. The integrated echo canceling multiplexor, as set forth in claim 7, further comprising a performance monitoring circuit coupled to said first multiplex-demultiplexing circuit for receiving said DS1 digital logic signals and determining the quality of said DS1 signal.

9. The integrated echo canceling multiplexor, as set forth in claim 7, further comprising a performance monitoring circuit coupled to said echo canceling circuit for receiving said echo-free DS1 digital logic signal and determining the quality of said echo-free DS1 signal.

10. The integrated echo canceling multiplexor, as set forth in claim 7, further comprising a performance monitoring circuit integrally coupled to said first multiplex-demultiplexing circuit for determining the quality of said received DS3 signal.

11. The integrated echo canceling multiplexor, as set forth in claim 7, further comprising a performance monitoring circuit integrally coupled to said second multiplex-demultiplexing circuit for determining the quality of said produced DS3 signal.

12. The integrated echo canceling multiplexor, as set forth in claim 7, further comprising a performance monitoring circuit integrally coupled to said echo canceling circuit for determining the quality of said DS1 signal at the DS0 level.

13. The integrated echo canceling multiplexor, as set forth in claim 12, wherein said DS0 level performance monitoring circuit determines the quality of said DS1 signal by computing the noise and signal powers and echo level for each channel.

14. An integrated echo canceling multiplexor, comprising:

a first multiplex-demultiplexing circuit for receiving DS3 signals and converting said DS3 signals to DS1 digital logic signals;

an echo canceling circuit coupled to said first multiplex-demultiplexing circuit for receiving said DS1 digital logic signals and producing echo-free DS1 digital logic signals;

a second multiplex-demultiplexing circuit coupled to said echo canceling circuit for receiving said echo-free digital logic signals and producing DS3 signals for transmission;

a performance monitoring circuit coupled to said first multiplex-demultiplexing circuit for receiving said DS1 digital logic signals and determining the quality of said DS1 signal;

said performance monitoring circuit further coupled to said echo canceling circuit for receiving said echo-free DS1 digital logic signal and determining the quality of said echo-free DS1 signal;

said performance monitoring circuit integrally coupled to said first multiplex-demultiplexing circuit for determining the quality of said received DS3 signal;

said performance monitoring circuit further integrally coupled to said second multiplex-demultiplexing circuit for determining the quality of said produced DS3 signal; and

said performance monitoring circuit integrally coupled to said echo canceling circuit for determining the quality of said DS1 signal at the DS0 level.

15. The integrated echo canceling multiplexor, as set forth in claim 14, wherein said performance monitoring circuit determines the quality of said DS1 signal by computing the noise, signal power and echo levels for each DS0 channel.

16. A method for integrated echo canceling multiplexing, comprising the steps of:

receiving DS3 signals;

performance monitoring said received DS3 signals and determining the quality thereof;

multiplexing said received DS3 signals and converting said DS3 signals to DS1 digital logic signals;

performance monitoring said produced DS1 digital logic signals and determining the quality thereof;

echo canceling said DS1 digital logic signals and producing echo-free DS1 digital logic signals;

performance monitoring said echo-free DS1 digital logic signals and determining the quality thereof;

demultiplexing said echo-free digital logic signals and producing DS3 signals for transmission; and

performance monitoring said produced DS3 signals for determining the quality thereof.