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zhaibase 5 ǰ

4.0 LEDݵԭ

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DDC 7 ǰ

ǼܼҾϵͳ

С۷

3 ǰ

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2017-2-6 19:47

DeviceWell SDI ʮָʹʹֲ

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з 2017-2-4 21:35

ʩߣƶ ߹

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DDC 2017-1-31 17:34

ѹ

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Ϣ 2017-1-13 08:39

OSIοģͣOSI/RMȫǿϵͳοģ OSI 7ģ

Ϣ

2017-1-13 08:41

OSI֪ʶ OSI/RMοģ͵ ϵһϵṹIBM˾74꣬SNAԺ˾ҲԼϵṹ磺Digital˾DNATCP/IPȣϵṹ棬IBMĽṹֻѡIBMIJƷֻֽͬṹ绥 Ϊ˴ٽķչʱ׼֯ISO1977һίԱᣬĻϣ˲ھ͡ϵͳ˾ϵṹΪϵͳģͣOSIοopen system interconnection OSIĿ OSIģ͵ĿdzΪһ̶ʵֵĿ·ģͣ˷ʹڶ˽ģѺ͵ЧԡOSIһ𾴵Ĺʱ׼IJɵģ֯ISOʱ׼֯ʲôOSIOSIOpen System Interconnection дΪʽϵͳοģ͡OSI֮ǰдڶϵṹIBM˾SNA(ϵͳϵṹ)DEC˾DNA(Digital Network Architecture)ϵṹΪΪ˽ͬϵṹĻ⣬ʱ׼֯ISO(עⲻҪOSI죩1981ƶ˿ϵͳοģͣOpen System Interconnection Reference ModelOSI/RMģͰͨŵĹΪ7,ɵ͵߷ֱ㣨Physical Layer),·㣨Data Link Layer),(Network Layer),㣨Transport Layer),Ự㣨Session Layerʾ㣨Presentation Layer)Ӧò㣨Application Layer)һ㵽OSIοģ͵ĵ㣬𴴽ͨӵ·IJ㵽߲ΪOSIοģ͵ĸIJ㣬帺˵˵ͨšÿһĹܣÿ㶼ֱΪϲṩ񣬲вζ֧֣ͨ϶£ڷͶˣ¶ϣڽնˣ˫СȻÿһͨŶҪOSIȫ߲㣬еֻҪ˫Ӧijһ㼴ɡӿ֮תӣԼмм֮Ӿֻнмɣ··ֻ֮辭µ㼴ɡܵ˵˫ͨڶԵȲϽеģڲԳƲϽͨš OSI ׼ƶвõķǽӴӵ⻮Ϊɸ״С⣬Ƿֲϵṹ취OSIУ󣬼ϵṹ壬Э˵ OSIֲεԭ и㶼ͬIJ ͬͬξͬĹ ͬһڲͨӿͨ ÿһʹ²ṩķ񣬲ϲṩ ͬͬȲͨЭʵֶԵȲͨ OSI/RMֲṹ ԵȲʵͨʱϢ ԵȲͨŵʵʣ ԵȲʵ֮ͨ;²ϲṩ;ʵͨײڷͷ߲²㴫,շͲ߲㴫. ЭݵԪPDU SIοģУԵȲЭ֮佻ϢԪͳΪЭݵԪ(PDU,Protocol Data Unit) 㼰¸PDU⻹иضƣ 㡪ݶΣSegment 㡪飨ݰPacket ·㡪֡Frame 㡪أBit

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ѧϰ 2017-1-12 02:31

:ΪS7700ʽҵ忨EA/EC/ED/BC/FA/FC/SA

ѧϰ

2017-1-15 19:39

ȺȺ

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2016-12-27 07:15

FJK-3ͷֲ ʹ˵

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ǻ۳ 2016-12-24 19:35

׻¼ǻ۳н

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з 2016-12-17 16:28

紸 electric hammer

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youfu88888 2016-12-6 11:52

ŷ辩άްװ

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lianlianguoji 2016-12-3 10:52

ذװ˾Žϵͳʹù

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