Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication network > General issues > Communication network equipment

Key Technologies Research Based on the E1 Transmission Multiplexer Network Bridge Switchs

Author YuQiang
Tutor XuYuanXin
School Zhejiang University
Course Electronics and Communication Engineering
Keywords Ethernet Bridge FPGA PAUSE frame E1 CDR SDRAM Arbitration Lookup table
CLC TN915.05
Type Master's thesis
Year 2012
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With the growth of the Internet and communication services , significant changes in consumer demand structure , more and more business integration and personalization needs . As today's most widely used three networks : telecommunication networks , radio networks and the Internet , the integration between them is the trend . The Internet as of today's the most vitality the most widely used network , can be seen from the advance of all-IP networks in today 's society , the interconnection of telecommunications networks and the Internet is of great significance for network convergence . The E1 standard Ethernet as the foundation of China 's telecommunications network and the Internet network , the interconnection between them for the triple play of practical significance . The bridge is commonly used to achieve the connection between heterogeneous networks , and it works at the data link layer , after the simple processing of the data frame can be forwarded out, reduces the processing delay and complexity . In this paper, the E1 / Ethernet bridge as access equipment for telecommunications networks and Ethernet bidirectional transmission . In a variety of forms of the single- chip FPGA to implement the overall architecture of the system , has a short development cycle , low cost , and facilitate future upgrades and maintenance of the system . A wide range of E1 / Ethernet adapter , but basically all the multiple E1 bundled Ethernet bridge and the 1/4/8 the road E1 / Ethernet bridge products , 16 E1 / Ethernet bridge products not much , only a handful of domestic manufacturers to develop commercial products . Given 16 Road / Ethernet Bridge designed and implemented , and focus on the PAUSE frame flow control algorithm , bridge used in the implementation process of the E1 line clock recovery CDR, lookup table , SDRAM controller , arbitration polling algorithm and key technologies . All functions with verilog hardware description language to achieve , and concluded that the functional simulation system after the integrated gate-level circuit simulation and timing simulation , the basic right to verify that the system functions .

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