×

Testing the performance of a communication line between two modems using modem processor

  • US 4,918,623 A
  • Filed: 10/19/1988
  • Issued: 04/17/1990
  • Est. Priority Date: 10/04/1985
  • Status: Expired due to Term
First Claim
Patent Images

1. Apparatus for quantitatively testing the performance of a communication line that carries customer data in both directions between two modems, said communication line carrying both customer data and a test command for controlling said testing, said apparatus comprisinga digital signal processor in each said modem coupled to said communication line for performing both digital modulation and demodulation of customer data carried on said line in accordance with a data program, and a series of quantitative tests of said line in accordance with a test program using test signal tones generated digitally, andin each said modem a programmable host processor separate from and coupled to said digital signal processor and responsive to said test command for selectively causing said digital signal processor to switch between performing said modulation and demodulation of customer data and said performing said series of quantitative tests.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×