JP2002368809A5

JP2002368809A5 -

Info

Publication number: JP2002368809A5
Application number: JP2002070763A
Authority: JP
Filing date: 2002-03-14
Publication date: 2005-02-03

Description

【００２７】
第１３の発明は、第１０〜第１２の発明に従属する発明であって、
読み出し制御部は、処理許可を受けると、ＡＴＭセル格納バッファから処理対象のＡＴＭセルのヘッダ部を読み出して、読み出しヘッダ判定部へ送出し、
読み出しヘッダ判定部は、読み出し制御部から受けるヘッダ部の情報からＡＴＭセル種別を判定し、ＡＴＭセルが標準形式であると判定した場合、ＡＴＭセルをヘッダ変換部へ直接送出し、ＡＴＭセルがＡＡＬタイプ２形式であると判定した場合、判定したＡＴＭセル種別に関してまたがり処理が必要か否かを、またがりセル格納バッファに格納されているまたがりフラグから判断し、
またがり有りの判断である場合、読み出しヘッダ判定部は、またがり有り情報をショートセル分離処理部に通知し、ショートセル分離処理部は、またがり有り情報の通知に応じて、またがりセル格納バッファからオフセットアドレス値で示されたまたがりセルを読み出し、読み出し完了を読み出し制御部へ通知し、読み出し制御部は、読み出し完了の通知に応じて、ＡＴＭセル格納バッファから処理対象のＡＴＭセルのペイロード部を読み出して、読み出しヘッダ判定部へ送出し、読み出しヘッダ判定部は、読み出し制御部から送出されるＡＴＭセルのペイロード部をショートセル分離処理部に送出すると共に、またがりセル格納バッファの対応する領域に書き込み、ショートセル分離処理部は、読み出しヘッダ判定部から送出されるＡＴＭセルのペイロード部をショートセルに順次分離し、
またがり無しの判断である場合、読み出しヘッダ判定部は、読み出し制御部によってＡＴＭセル格納バッファから読み出された処理対象のＡＴＭセルのペイロード部を、ショートセル分離処理部に送出すると共に、またがりセル格納バッファの対応する領域に書き込み、ショートセル分離処理部は、読み出しヘッダ判定部から送出されるＡＴＭセルのペイロード部をショートセルに順次分離することを特徴とする。[0027]
A thirteenth invention is an invention subordinate to the tenth to twelfth inventions, wherein
When the read control unit receives the processing permission, the read control unit reads the header portion of the ATM cell to be processed from the ATM cell storage buffer and sends it to the read header determination unit.
The read header judgment unit judges the ATM cell type from the information of the header unit received from the read control unit, and when it is judged that the ATM cell is in the standard format, sends the ATM cell directly to the header conversion unit and the ATM cell is AAL. If it is determined that the type 2 format is used, it is determined from the crossover flag stored in the crossover cell storage buffer whether or not the crossover process is necessary for the determined ATM cell type,
If it is determined that there is a spread, the read header judgment unit notifies the short cell separation processing unit of the spread presence information, and the short cell separation processing unit responds to the notification of the spread presence information from the spread cell storage buffer to the offset address. The crossover cell indicated by the value is read out, readout completion is notified to the readout control unit, and the readout control unit reads out the payload portion of the processing target ATM cell from the ATM cell storage buffer according to the readout completion notification. The read header determination unit sends the payload portion of the ATM cell sent from the read control unit to the short cell separation processing unit, and writes the payload portion of the ATM cell to the corresponding area of the spanning cell storage buffer. The separation processing unit transmits the ATM sent from the read header determination unit In order to separate the payload section of Le in the short cell,
If it is determined that there is no coverage, the read header determination unit sends out the payload of the processing target ATM cell read from the ATM cell storage buffer by the read control unit to the short cell separation processing unit and stores the spanning cell. The writing is performed in the corresponding area of the buffer, and the short cell separation processing unit sequentially separates the payload portion of the ATM cell sent from the read header determination unit into the short cell.

Claims

The read control unit, upon receiving the processing permission, reads the header portion of the ATM cell to be processed from the ATM cell storage buffer and sends it to the read header determination unit.
The read header determination unit
Determine an ATM cell type from the information of the header section received from the read control unit;
If it is determined that the ATM cell is in a standard format, the ATM cell is directly sent to the header converter;
When it is determined that the ATM cell is AAL type 2 format, it is determined from the crossover flag stored in the crossover cell storage buffer whether or not the crossover process is necessary for the determined ATM cell type.
If it is judged that there is a balloon,
The read header determination unit notifies the short cell separation processing unit of the cross presence information.
The short cell separation processing unit reads the crossover cell indicated by the offset address value from the crossover cell storage buffer in response to the notification of the crossover presence information, and notifies the readout control unit that the readout is completed.
The read control unit reads the payload portion of the ATM cell to be processed from the ATM cell storage buffer in response to the notification of the read completion, and sends it to the read header determination unit.
The read header determination unit sends the payload portion of the ATM cell sent from the read control unit to the short cell separation processing unit and writes the payload portion to the corresponding area of the spanning cell storage buffer;
The short cell separation processing unit sequentially separates the payload portion of the ATM cell sent from the read header determination unit into short cells,
If it is judged that there is no pain again
The read header determination unit sends the payload portion of the ATM cell to be processed read from the ATM cell storage buffer by the read control unit to the short cell separation processing unit, and also supports the overlap cell storage buffer. Write to the
The short cell separation apparatus according to any one of claims 10 to 12, wherein the short cell separation processing unit sequentially separates the payload portion of the ATM cell sent from the read header determination unit into short cells. .