Loopback cell control system

Details Loopback cell control system Loopback cell control system

1997-09-10

2000-02-08

Horabik, Michael

Multiplex communications

Diagnostic testing

Loopback

370252, G08C 1500, G06F 1100, G01R 3108

Patent

active

060234555

ABSTRACT:
A loopback cell control system includes ATM apparatuses and forward and backward paths and serves to perform a loopback test by circulating a loopback cell through a route in an ATM network once. Each ATM apparatus includes a time managing section, a loopback control section, and a route delay measuring section. The timing managing section measures the elapsed time between the transmission of the loopback cell and the reception thereof, and notifies a timeout when the elapsed time exceeds a predetermined reference time. The loopback control section includes a transmission control section, a turning control section, a turning control section, a relay control section, and a reception control section. The route delay measuring section calculates a delay time in each of the forward and backward paths on the basis of the transmission time, the turning time, and the reception time notified from the loopback control section when the backward loopback cell is received as an end point, and outputs an alarm signal when each of the calculated delay times is longer than a predetermined reference time.

REFERENCES:
patent: 5450394 (1995-09-01), Gruber et al.
patent: 5563875 (1996-10-01), Hefel et al.
patent: 5812528 (1998-09-01), VanDervort

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