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    • 3. 发明公开
    • Transmission of voice over an asynchronous network
    • überüüü。。。。。。。。。。。。。。
    • EP0836356A2
    • 1998-04-15
    • EP97307606.0
    • 1997-09-26
    • Melita International Corporation
    • Trumbull, Dean A.
    • H04Q11/04
    • H04L12/6418H04L2012/5616H04L2012/5638H04L2012/5653H04L2012/5671H04L2012/5672H04L2012/6427H04L2012/6459H04L2012/6475H04L2012/6481H04M3/005H04M3/42323H04M7/0018H04M7/006H04Q11/0478
    • An SCSA RX/TX memory (220) receives voice data and stores voice data samples under established voice channel identifiers. A controller (240) selects voice channels, and their associated voice data, for inclusion in an ATM cell. The memory (220) sends the voice channel identifier and the voice data for the selected channels to a Constant Bit Rate Segmentation And Reassembly (CBR SAR) circuit (225). The CBR SAR aggregates the voice data into an appropriate number of ATM cell slots for each of those voice channels. The CBR SAR 225 sends the aggregated information to a Multiplexer/Duplicator Circuit (MUX/DUP) (230) which assembles the ATM cell, and sends the completed ATM cell to an ATM transceiver (265) for transmission. When there is no voice data to be sent information data from an Available Bit Rate (ABR) SAR (260) is assembled to form an ATM cell to be sent by the ATM transceiver. The MUX/DUP also receives an ATM cell from the ATM transceiver, duplicates the ATM cell, sends one copy of the ATM cell to the CBR SAR, and one copy of the ATM cell to the ABR SAR. The SARs disassemble the ATM cell, verify the channel identifiers, and route any valid channel identifiers and associated data to their respective memories. The SCSA memory attaches a channel identifier number to each voice data sample and sends the combination to the SCSA interface, which then places the combination on the SCSA port (210). A host device causes the information data to be read from the DATA memory via PCI ports (245) via a DMA operation.
    • SCSA RX / TX存储器(220)接收语音数据并将语音数据样本存储在已建立的话音信道标识符下。 控制器(240)选择语音信道及其相关联的语音数据以包括在ATM信元中。 存储器(220)将所选择的信道的语音信道标识符和语音数据发送到恒定比特率分割和重组(CBR SAR)电路(225)。 CBR SAR将语音数据聚合成用于每个语音信道的适当数量的ATM信元时隙。 CBR SAR 225将聚合信息发送到组装ATM信元的多路复用器/复制器电路(MUX / DUP)(230),并将完成的ATM信元发送到ATM收发器(265)以进行传输。 当没有要发送的话音数据时,来自可用比特率(ABR)SAR(260)的信息数据被组合以形成由ATM收发器发送的ATM信元。 MUX / DUP还从ATM收发器接收ATM信元,复制ATM信元,将ATM信元的一个副本发送到CBR SAR,将ATM信元的一个副本发送到ABR SAR。 SAR分解ATM信元,验证信道标识符,并将任何有效信道标识符和相关数据路由到其各自的存储器。 SCSA存储器向每个语音数据样本附加通道标识符号,并将组合发送到SCSA接口,SCSA接口将组合放置在SCSA端口(210)上。 主机设备通过DMA操作使得经由PCI端口(245)从DATA存储器读取信息数据。