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    • 2. 发明公开
    • Hybrid digital cross-connect for switching circuit and packet based data traffic
    • Hybrides digitales Koppelfeld zur Vermittlung von Leitungs- und paketbasiertenDatenströmen
    • EP1701495A1
    • 2006-09-13
    • EP05425134.3
    • 2005-03-09
    • SIEMENS AKTIENGESELLSCHAFT
    • Saracino, Sante
    • H04L12/64
    • H04L12/6402H04J2203/0012H04J2203/0082H04L12/6418H04L49/606H04L2012/6408H04L2012/6413H04L2012/6459H04L2012/6472
    • A network node includes bidirectional interfaces having first ports for ingress/egress of circuit and/or packet based traffic from/to the network and second ports connected to a Hybrid Switch capable of routing mixed traffic through the node. The connection between the second ports and the Hybrid Switch is carried out by an unique SDH bus on the backplane which transport said mixed circuit and packet based traffic. An interface for mixed Ethernet packet and circuit based traffic forwards the VCs relevant to circuits to a combiner at the second port. For each packet entering the node the interface generates a VLAN-ID from the MAC addresses and maps it onto a CID identifier only usable inside the Hybrid Switch. A GFP framer inserts the CID in the GFP header and encapsulates the packet, without VLAN-ID, into the GFP payload. GFP frames so arranged are embedded into VC-4 containers, which are combined with the VCs relevant to circuits into an STM-16 flow directed to the Hybrid Switch. The latter receives and synchronizes all the m received STM-16 flows and for each flow disassembles the VCs and sends each byte of VCs carrying circuit based transport signal to an m -input multiplexer belonging to a Circuit Switch. For the VC-4s carrying packets, the Hybrid Switch sends each byte of n concatenated VC-4 to a set of m x m -input multiplexers belonging to a Packet Switch. The latter performs the delineation on the GFP frames, retrieves the CID and PLI contents from the header and sends their values to a Router. The m -input multiplexers both for circuits and packets are univocally associated to the m STM-16 input channels, so that all traffic node is considered simultaneously. The outputs of the m packet multiplexers are stored into m buffers to be sent together with the output of the circuit multiplexer to the inputs of a final multiplexer, whose output signal is sent to a STM-16 former followed by a serializer. Routing tables are stored in advance for packets and circuits. According to the routing tables, the Router of the Hybrid Switch, selects for the m circuit multiplexers the one out of m inputs to be forwarded to the output, while similar selection for the m packet multiplexers is performed from the received CIDs and PLIs values. The Centralized Router also controls the final multiplexer to output either packets or circuits. Finally, the VCs are completed with headers and pointers and the resulting STM-16 flows are forwarded on the SDH output bus towards the interfaces. The interfaces perform dual operations with respect of the former direction, particularly reinsert the VLAN-IDs in the payloads of the switched GFP frames.
    • 网络节点包括具有第一端口的双向接口,所述第一端口用于从网络进入电路和/或基于分组的流量入口/出口,以及连接到能够通过该节点路由混合业务的混合交换机的第二端口。 第二端口和混合交换机之间的连接由底板上的唯一SDH总线执行,该SDH总线传输所述混合电路和基于分组的业务。 用于混合以太网分组和基于电路的业务的接口将与电路相关的VC转发到第二端口的组合器。 对于进入节点的每个数据包,接口从MAC地址生成VLAN-ID,并将其映射到只能在混合交换机内部使用的CID标识符。 GFP成帧器将CID插入到GFP报头中,并将无VLAN-ID的数据包封装到GFP有效载荷中。 如此布置的GFP帧被嵌入到VC-4容器中,其与与电路相关的VC组合成指向混合交换机的STM-16流。 后者接收并同步所有接收到的STM-16流,并且对于每个流程分解VC,并将携带基于电路的传输信号的VC的每个字节发送到属于电路交换机的m-输入多路复用器。 对于携带数据包的VC-4,混合交换机将n级连接的VC-4的每个字节发送到属于分组交换机的一组m×m个输入多路复用器。 后者执行GFP帧上的描述,从标头检索CID和PLI内容,并将其值发送到路由器。 用于电路和分组的m输入复用器都与m STM-16输入通道单一关联,以便同时考虑所有业务节点。 m个分组多路复用器的输出被存储到m个缓冲器中以便与电路多路复用器的输出一起发送到最终多路复用器的输入端,最后的多路复用器的输出信号被发送到STM-16前置器,然后是串行器。 路由表预先存储在分组和电路中。 根据路由表,混合交换机的路由器,选择m个电路复用器,将m个输入中的一个输入转发到输出,同时从接收的CID和PLI值中执行m个分组复用器的类似选择。 集中式路由器还控制最终多路复用器输出数据包或电路。 最后,使用头和指针完成VC,并将所产生的STM-16流在SDH输出总线上转发到接口。 接口对前一方向执行双重操作,特别是重新插入交换的GFP帧的有效载荷中的VLAN-ID。