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在低成本寬頻網路方案中享有良好的影像傳輸品質
傳輸控制協議(TCP)是一種可靠的傳輸協議,可在發生封包丟失情況發生時, 重新發送所有未被接收方確認的封包,確保資料傳輸的完整性。相較於 TCP 傳輸協議,用戶資料流協議 (UDP ) 在傳送的過程中,接收端接收到封包後並不會做回覆確認動作給發送端,也因此封包沒有像 TCP 管理得這麼嚴密。但也因此傳輸效率也比較好。即時通訊應用例如: 語音與視訊等,多以 UDP 傳輸協議方式發送。

寬頻網路上常有小幅度的網路封包丟失,這對視訊或語音等 UDP 傳輸等應用的影響可能不會太大,接收端或許只會聽到語音或看到畫面有雜訊。但是當網路封包丟失到達一定程度,就可能出現一大堆像馬賽克的雜訊在視訊會議上。

>  前向錯誤更正 (Forward Error Correction)

對於視訊或語音等即時應用 UDP 傳輸, 前向錯誤更正(Forward Error Correction, FEC)機制在傳送封包時, 會添加額外封包至外送流量中,這使接收端能夠從封包丟失和其他可能的錯誤中快速回復,提高即時應用程序的質。除了採用 FEC 機制降低封包丟失對即時傳輸的影響,還可以建立多重 FEC 通道搭配封包分流技術達成頻寬整併,企業享有即時影音傳輸優化與加速雙重效益。企業即使採用低成本寬頻網路方案,仍可享有良好的即時影音應用傳輸品質。

FEC 設置簡圖

FEC 技術可搭配封包分流頻寬整併 (Packet-Level Bandwidth Bonding) 技術同時使用,兩種技術的結合使用,可提高語音與視訊的傳輸品質,同時提高廣域網路吞吐量。

主要商業效益
>  語音與視訊應用的流量傳輸品質優化。
>  即使採用低成本寬頻網路方案,即時應用仍享有良好的傳輸品質。
>  可與封包分流頻寬整併技術搭配使用。

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