Method and device for compressing and controlling inter-packet gap (IPG) of Ethernet
A compression control and frame interval technology, applied in the field of network communication, can solve the problems of transmission quality impact, speed up transmission, and reduce frame interval
Inactive Publication Date: 2011-09-14
HUAWEI TECH CO LTD
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[0003] In the solutions of the prior art, the method of transmitting additional information is to obtain additional bandwidth by deleting the FCS check field in the encapsulation of the data link layer, and use the obtained additional bandwidth to transmit additional information such as message description information, so that users The data message reaches the wire-speed, but if the FCS check field is deleted, the error in the transmission process cannot be detected, and the bit error in the high-speed serial link is inevitable, which affects the transmission quality; One solution is that the RS layer compresses the frame interval according to the waterline of its own sending buffer, and shortens the frame interval when the sending buffer waterline is high to speed up the sending speed. The compressed IPG method required in the aspect may cause the frequency difference matching character ||R|| code group not to be sent on the link for a long time, so that the receiver cannot achieve frequency difference matching, resulting in data transmission failure, receiver buffer overflow, and Data packet errors are even more serious problems, which can also affect the quality of transmission
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[0016] The embodiment of the present invention provides a method and device for Ethernet frame interval compression control. In 10 Gigabit Ethernet, the size of the frame interval IPG is realized in the sending direction of the coordination sublayer RS, and the RS transmits the character stream to the Physical Coding Sublayer (PCS) through the 10 Gigabit medium independent interface XGMII. PCS does not increase or decrease bytes. It maps the character stream in XGMII format into code-groups according to fixed rules. Part of it is the mapping of IPG. PCS will map IPG into four code-groups for transmission. , One of the code groups is the ||R|| code group, which is the frequency difference matching character. Because the clock accuracy requirement in the 10 Gigabit Ethernet protocol is 100 part per million (100 part per million, 100 ppm), so When the sender and the receiver use different clocks, it is necessary to add or delete the frequency difference matching character ||R|| to...
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The embodiment of the invention provides a method and device for compressing and controlling the inter-packet gap (IPG) of Ethernet. The method comprises the following steps of: reducing the transmission of ||R|| code blocks of frequency difference matching characters in a IPG in the transmitting process of an Ethernet message to reduce the IPG; and transmitting additional information of a message by using an additional bandwidth obtained by reducing the IPG. By adopting the method, the IPG can be compressed completely while the link state is considered under the condition of keeping an FCS (Frame Check Sequence) check field, the influence on the transmission quality caused by jumping of necessary frequency difference matching characters is avoided, the obtained additional bandwidth can be used to transmit additional information such as message description information and the like, and wire-speed of user data is realized.
Description
Technical field [0001] The present invention relates to the field of network communication, in particular to a method and device for Ethernet frame interval compression control. Background technique [0002] At present, in communication equipment, in addition to normal data messages, the data transmitted between chips also has some additional information, such as message description information. The next-level chip processes different messages differently according to the message description information provided by the upper-level chip. For example, the data included in the packet processing (PP) to the traffic management (Traffic Management, TM) Port number, message priority, queue number and other message description information related to the quality of service QOS. These "extra" message description information occupy the bandwidth of the link, resulting in the failure of normal user data to reach the wire-speed (wire-speed). In actual applications, in order to achieve wire-s...
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IPC IPC(8): H04L12/56H04L12/70
Inventor 杨康
Owner HUAWEI TECH CO LTD