US 7,002,969 B2 · STS frame-ATM cell circuit emulation apparatus and frame length compensation method for the same

Abstract

A circuit simulation apparatus is disclosed by which, even if an STS-N frame of an abnormal length is detected by a reassembly buffer, the frame length can be compensated for while preventing an overflow of the reassembly buffer. When an STS-(N×M) frame formed by multiplexing M STS-N frames formed from different channels is cellularized into ATM cells or M different STS-N frames assembled from ATM cells are multiplexed into an STS-(N×M) frame, an ATM cell sync signal and ATM cell data from a buffer section are outputted as a frame pulse signal and frame data from a reassembly section to a circuit termination section, and frame length compensation of the frame pulse signal and the frame data is performed by the reassembly section.

Claims15

Dependent claims

An STS frame-ATM cell circuit emulation apparatus for cellularizing an STS-(N×M) frame formed by multiplexing M STS-N frames formed from different channels into ATM cells and multiplexing M different STS-N frames assembled from ATM cells into an STS-(N×M) frame, comprising:

circuit termination means for inputting and outputting frame data from and to a circuit;
buffer means for inputting and outputting an ATM cell sync signal and ATM cell data from and to an ATM switch;
and
reassembly means connected between said circuit termination means and said buffer means;
said reassembly means for detecting a frame of an abnormal length from the ATM cell sync signal and the ATM cell data from said buffer means, compensating, when a frame of an abnormal length is detected, for the abnormal length of the frame with data from a next frame, and outputting a resulting frame as a frame pulse signal and frame data to said circuit termination means.

2 more elements

A frame length compensation method for an STS frame-ATM cell circuit emulation apparatus for cellularizing an STS-(N×M) frame formed by multiplexing M STS-N frames formed from different channels into ATM cells and multiplexing M different STS-N frames assembled from ATM cells into an STS-(N×M) frame, comprising:

receiving an ATM cell sync signal and ATM cell data from an ATM switch;
temporarily storing and then outputting the ATM cell sync signal and ATM cell data;
detecting a frame of an abnormal length from the ATM cell sync signal and the ATM cell data;
compensating, when a frame of an abnormal length is detected, for the abnormal length of the frame with data from a next frame to form a resulting frame;
and
outputting the resulting frame.

3 more elements

Dependencies are inferred from the claim text.

STS frame-ATM cell circuit emulation apparatus and frame length compensation method for the same

Life of this patent

STS frame-ATM cell circuit emulation apparatus and frame length compensation method for the same

Life of this patent

Abstract

Claims15