US 5,854,816 A · Loop back device of packet communication T1 network

Abstract

A loop back device of a packet communication T1 network includes: a clock generating part which inputs a frame divisional clock and a reference clock, inserts a modulated clock at a predetermined position of the reference clock to generate a main clock and is synchronous to the transformed clock position to generate a system clock for generating and extracting loop back data; a loop back data inserting part which generates the loop back data and is synchronous to the system clock generated from the clock generating part to insert the loop back data into transmission data; a framer and interface part which inputs the transmission data including the loop back data outputted from the loop back data inserting part to transmit the input data to the T1 network and receives is data from the T1 network; a loop back data extracting part which is synchronous to the system clock generated in the clock generating part to extract the loop back data from reception data outputted from the framer and interface part; and a processor which outputs the transmission data to the loop back data inserting part and inputs said loop back data extracted from said loop back data extracting part, to output network testing data.

Claims14

Dependent claims

A loop back device of a packet communication T1 network, said device comprising:

a clock generating part for receiving a frame divisional clock and a reference clock, for inserting a transformed clock at a predetermined position of said reference clock to thereby generate a main clock, and being synchronous to a position of the transformed clock to thereby generate a system clock which generates and extracts loop back data;
a loop back data inserting part for generating said loop back data and being synchronous to said system clock generated from said clock generating part to thereby insert said loop back data into first transmission data;
a framer and interface part for receiving second transmission data including said loop back data output from said loop back data inserting part to transmit the input data to the T1 network and for receiving data which is transmitted from an opposite station from the T1 network;
a loop back data extracting part being synchronous to said system clock generated in said clock generating part to extract said loop back data from reception data output from said framer and interface part;
and
a processor for outputting said first transmission data to said loop back data inserting part and for receiving said loop back data extracted from said loop back data extracting part, to thereby output network testing data.

3 more elements

A loop back device of a packet communication T1 network, said device comprising:

a clock generating part for generating a main clock which transmits/receives data to and from the T1 network by transforming a reference clock and for generating a system clock which generates and extracts loop back data;
a loop back data inserting part for generating said loop back data and being synchronous to said system clock generated from said clock generating part to insert said loop back data into first transmission data;
a framer and interface part for transmitting second transmission data output from said loop back data inserting part to the T1 network and for receiving data from the T1 network;
a loop back data extracting part, said loop back data extracting part being synchronous to said system clock to extract said loop back data from reception data output from said framer and interface part;
and
a processor for outputting said first transmission data to said loop back data inserting part according to said main clock, and for receiving said loop back data extracted from said loop back data extracting part, to thereby output network testing data.

3 more elements

Dependencies are inferred from the claim text.

Loop back device of packet communication T1 network

Life of this patent

Loop back device of packet communication T1 network

Life of this patent

Abstract

Claims14