Cell bandwidth control apparatus
AssigneeFujitsu Limited
InventorsIwao Tada, Jyoei Kamoi, Tomoyuki Yamaguchi, Naoki Aihara
Life of this patent
Estimating the term…
Abstract
The invention concerns an ATM exchange, and is directed in particular to the provision of a cell bandwidth control apparatus for performing bandwidth control for ATM cells sent from the ATM exchange onto the line side. The cell bandwidth control apparatus includes forced empty cell inserting means for forcibly inserting empty cells in a highway connected to an ATM switch. The forced empty cell inserting means inserts forced empty cells in an outgoing highway leading from the ATM switch to a line adapter and thereby limits the line bandwidth of the outgoing highway to within the bandwidth of the line accommodated in the line adapter.
Claims19
A cell bandwidth control apparatus that is connected to an output highway of an ATM switch converts a transmission speed of data on the output highway to the speed of the input line side, and transmits the converted data to a line, comprising:
- forced empty cell inserting means for inserting a forced empty cell into the output highway to fill out the excess portion of a bandwidth of the outgoing highway over an effective bandwidth within the ATM exchange;
- and
- OAM cell inserting means for inserting an OAM cell into the other portion of the bandwidth unused by the forced empty cell
- said forced empty cell inserting means inserts a forced empty cell in an outgoing highway leading from said ATM switch to said line adapter, thereby limiting the line bandwidth of said outgoing highway to within the bandwidth of said line accommodated in said line adapter.
A cell bandwidth with control apparatus for performing bandwidth control for ATM cells transferred between an ATM exchange and a line adapter accommodating a line, comprising:
- forced empty cell inserting means for forcibly inserting an empty cell in a highway connected to an ATM switch and said ATM exchange, wherein
- said forced empty cell inserting means inserts a forced empty cell in an outgoing highway leading from said ATM switch to said line adapter, thereby limiting the line bandwidth of said outgoing highway to within the bandwidth of said line accommodated in said line adapter,
- said forced empty cell carries a prescribed forced empty cell identification flag within its tag and is distinguished from other cells by said forced empty cell identification flag,
- wherein
- a separate line for forced empty cell identification is provided in place of said prescribed forced empty cell identification flag for identifying said forced empty cell, and
- said forced empty cell is distinguished from other cells by a forced empty cell identification signal from said separate line.
A cell bandwidth control apparatus for performing bandwidth control for ATM cells transferred between an ATM exchange and a line adapter accommodating a line, comprising:
- forced empty cell inserting means for forcibly inserting an empty cell in a highway connected to an ATM switch in said ATM exchange, said forced empty cell inserting means inserts a forced empty cell in an outgoing highway leading from said ATM switch to said line adapter, thereby limiting the line bandwidth of said outgoing highway to within the bandwidth of said line accommodated in said line adapter;
- and
- including test cell inserting means for mapping test data into a payload area of said forced empty cell, thereby providing said forced empty cell with a line test function.
A cell bandwidth control apparatus for performing bandwidth control for ATM cells transferred between an ATM exchange and a line adapter accommodating a line, comprising:
- forced empty cell inserting means for forcibly inserting an empty cell in a highway connected to an ATM switch in said ATM exchange, said forced empty cell inserting means inserts a forced empty cell in an outgoing highway leading from ATM switch to said line adapter, thereby limiting the line bandwidth of said outgoing highway to within the bandwidth of said line accommodated in said line adapter;
- and
- forced empty cell filtering device for extracting only a forced empty cell on said outgoing highway, wherein
- the forced empty cell extracted by said forced empty cell filtering device is directly looped back by said forced empty cell inserting means for insertion into an incoming highway leading from said line adapter to said ATM switch, thereby limiting the line bandwidth of said incoming highway to within the bandwidth of the line accommodated in said line adapter.
A cell bandwidth control apparatus for limiting a communication bandwidth in ATM communications, on the side of an ATM communication apparatus having a larger communication bandwidth comprising:
- forced empty cell inserting means for inserting a forced empty cell into a bandwidth of the ATM communication apparatus having the larger communication bandwidth to fill out the excess portion of a bandwidth of the other ATM communication apparatus having a smaller communication bandwidth;
- and
- OAM cell inserting means for inserting an OAM cell into the other portion of the bandwidth unused by the forced empty cell.
A cell bandwidth control apparatus that is connected to the input and output highways of an ATM switch, and converts a data transmission speed between the input and out put highways, comprising:
- forced empty cell inserting means for inserting a forced empty cell into the output highway to fill out the excess portion of a bandwidth of the output highway over an effective bandwidth within the ATM exchange;
- OAM cell inserting means for inserting an OAM cell into the other portion of the bandwidth unused by the forced empty cell;
- and
- input highway inserting means for extracting a forced empty cell from the output highway and inserting the extracted forced empty cell into the input highway.
Dependencies are inferred from the claim text.