ATM cell flow control apparatus

Claim 2

An ATM cell flow control apparatus comprising interface sections for terminating transmission lines of two systems which constitute a redundant structure and to which identical cell sequences are supplied, each of said interface sections including: cell synchronization means for performing cell synchronization control of an input cell sequence and outputting the sequence in units of cells; delay adjustment means for performing delay adjustment of each cell output from said cell synchronization means; cell interval detection means for detecting a cell interval between cells output from said delay adjustment means, and discarding cells having a detected cell interval shorter than a predetermined cell interval; and delay control means for detecting a phase difference between a cell output from said delay adjustment means of a self-system and a cell output from said delay adjustment means of the other system, and controlling said delay adjustment means in accordance with the detected phase difference.

Claim 3

An apparatus according to claim 1, wherein said delay control means comprises phase difference detection means for detecting a phase difference between a cell output from said delay adjustment means of the self-system and a cell output from said delay adjustment means of the other system, and delay amount control means for controlling a cell delay amount of said delay adjustment means such that a phase difference detected by said phase difference detection means becomes zero.

Claim 4

An apparatus according to claim 1, wherein said delay control means controls said delay adjustment means to delay a cell in the self-system when a phase of the cell output from said delay adjustment means of the self-system leads a phase of a corresponding cell output from said delay adjustment means of the other system.

Claim 5

An apparatus according to claim 1, wherein said delay adjustment means comprises a cell buffer for temporarily storing a cell output from said cell synchronization means, and performs delay adjustment of the cell by controlling a read timing of the cell stored in said cell buffer.

Claim 6

An apparatus according to claim 1, further comprising selector means for switching/outputting a cell output from said cell interval detection means of the self-system and a cell output from said cell interval detection means of the other system.

Claim 7

An ATM cell flow control apparatus comprising interface sections for terminating transmission lines of two systems which constitute a redundant structure and to which identical cell sequences are supplied, and a selector section for switching/outputting cells output from said interface sections, each of said interface sections including: cell synchronization means for performing cell synchronization control of an input cell sequence and outputting the sequence in units of cells; a cell buffer whose read timing is controlled, said cell buffer temporarily storing a cell output from said cell synchronization means; cell interval detection means for detecting a cell interval between cells output from said cell buffer, and discarding cells having a detected cell interval shorter than a predetermined cell interval, the cell output from said cell interval detection means being output to said selector section; phase difference detection means for detecting a phase difference between a cell output from said cell buffer of a self-system and a cell output from said cell buffer of the other system; and cell buffer control means for controlling a read timing of said cell buffer in accordance with a detected phase difference.

Claim 8

An ATM cell flow control apparatus comprising interface sections for terminating transmission lines of two systems which constitute a redundant structure and to which identical cell sequences are supplied, and a selector section for switching/outputting cells output from said interface sections, each of said interface sections including: cell synchronization means for performing cell synchronization control of an input cell sequence and outputting the sequence in units of cells; a cell buffer whose read timing is controlled, said cell buffer temporarily storing a cell output from said cell synchronization means; cell interval detection means for detecting a cell interval between cells output from said cell buffer, and discarding cells having a detected cell interval shorter than a predetermined cell interval, the cell output from said cell interval detection means being output to said selector section; phase difference detection means for detecting a phase difference between a cell output from said cell buffer of a self-system and a cell output from said cell buffer of the other system; and cell buffer control means for controlling a read timing of said cell buffer in accordance with a detected phase difference.