公开(公告)号：US5719864A

公开(公告)日：1998-02-17

申请号：US513711

申请日：1995-08-11

申请人： Ryan Lance Badger ,  Vernon Roberts Norman ,  Brian Alan Youngman

发明人： Ryan Lance Badger ,  Vernon Roberts Norman ,  Brian Alan Youngman

IPC分类号： H04L12/56 ,  H04Q11/04 ,  H04L12/28

CPC分类号： H04L49/3081 ,  H04Q11/0478 ,  H04L2012/5614 ,  H04L2012/5619

摘要： An asynchronous transmission mode data cell header includes virtual channel and virtual path identifiers which are resolved into logical channel identifiers at the user interface by two table lookup operations. The virtual path identifier is used to access a virtual path table entry having a variable length pointer value buffered out to a fixed length field by zeros with a binary one at the boundary position. Using the binary one as a marker, the pointer field is extracted and concatenated with a base register value and the lower order bits of the virtual channel identifier, corresponding to the bit position of the binary one marker, to provide an index into a logical channel identifier table. The logical channel identifier is used to associate the data cell attached to that header with the appropriate user data stream.

摘要翻译： 异步传输模式数据单元报头包括虚拟通道和虚拟路径标识符，其通过两个表查找操作在用户界面处被解析为逻辑信道标识符。 虚拟路径标识符用于访问虚拟路径表条目，该虚拟路径表条目具有通过在边界位置处具有二进制值的零来缓冲到固定长度字段的可变长度指针值。 使用二进制一个作为标记，指针字段被提取并与基本寄存器值和虚拟信道标识符的低位比特相对应，与二进制一个标记的比特位置相对应，以向逻辑信道提供索引 标识符表。 逻辑信道标识符用于将附加到该报头的数据信元与适当的用户数据流相关联。