US 6,603,767 B1Granted

Cell exchanging device

AssigneeHitachi, Ltd.

InventorsYasuo Murakami, Takaaki Toyama

Life of this patent

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Abstract

Provided is a cell exchanging device which realizes switching of an AAL2 connection level using an existing ATM switch, thus preventing deterioration of a transfer quality of other ATM cells. In an input-side ATM line corresponding section, provided are an ATM cell demultiplexing section 113-I-1 for extracting and separating only an AAL2 cell from an ATM cell, an AAL2 DMX 113-I-2 for converting from the AAL2 cell to an AAL2 partial fill cell, and an ATM cell multiplexing section 113-I-4 for multiplexing and packing the ALL2 partial fill cell and the ATM cell other than AAL2. Before entering to the ATM switch, a priority order of each ATM cell is determined based on class information presented in the ATM line corresponding section, and reading-out from the ATM cell multiplexing section is controlled. Similarly, also in an output-side ATM line corresponding section, at the time of a transfer to a transmission path, a priority order of each ATM cell is determined based on class information presented in the input-side ATM line corresponding section and a reading-out is performed.

Claims17

Dependent claims

A cell exchanging device which exchanges a plurality of variable length packets multiplexed and packed into one cell to be transferred in an Asynchronous Transfer Mode, comprising:

a plurality of receiving interface sections for receiving a cell;
a plurality of transmitting interface sections for transmitting the cell;
and
a switching section for exchanging the cell, to which said receiving interface sections and said transmitting interface sections are connected, wherein:
each of said receiving interface section includes a receiving cell transfer control section which disassembles the received cell to demultiplex and unpacked the plurality of variable length packets multiplexed and unpacked in the received cell, and converts the received cell to a cell which has one of the demultiplexd and unpacked variable length packets, thereby transferring the cell to said switching section,
said switching section transfers the cell transferred from said receiving interface section to said transmitting interface section where a transmission processing is performed depending on a header value of the cell, and
said transmitting interface section includes a transmitting cell transfer control section which demultiplexs and unpacks the variable length packet from the cell transferred from said switching section and multiplexes and packs a plurality of variable length packets in one cell, the plurality of variable length packets corresponding to the same output path.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/373,595Filed 13 Aug 1999
Priority: JP 11-20026714 Jul 1999
Granted: 5 Aug 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04L 49/309
ATM peripheral units, e.g. policing, insertion or extraction: header conversion, routing tables or routing tags
H04L 12/5601
Packet switching systems: transfer mode dependent, e.g. ATM
H04L 12/5602
Transfer mode dependent, e.g. ATM: bandwidth control in ATM Networks, e.g. leaky bucket
H04L 47/2441
Traffic characterised by specific attributes, e.g. priority or QoS: relying on flow classification, e.g. using integrated services [IntServ]