If for UDP 42 packets are lost from the raw data then what is the size of each packet in bytes ?
I guess the modern Ethernet Networks have TCP/IP and not UDP, is that right ?
I guess one TCP packet header is around 20-60 bytes, so how many packet headers are lost from the raw data per second ?
Normal ethernet packets are 64-1500 bytes. Jumbo frames/packets are up to about 8000 bytes.
42 bytes are lost in each packet for udp, but there are 3 levels:
ethernet header: 14 bytes
ipv4 header: 20 bytes
udp header: 8 bytes
The ethernet and ipv4 headers are the same size for tcp, so in total 54-94 bytes are lost per packet (20-60 bytes in the tcp header).
The headers always exist in every packet, so for udp is 42 bytes "lost" in each packet of 64-1500 bytes.
Not quite. 1 GBPS (4 pairs a 250 MBPS) is raw bit rate, by 8B/10B encoding, the netto data rate is 100 MByte/s.This means theoretically 95 % of 125 M bytes per second is the useful data (actual message information) for 1G Ethernet, i.e. 118 M bytes per second, right ?
Not quite. 1 GBPS (4 pairs a 250 MBPS) is raw bit rate, by 8B/10B encoding, the netto data rate is 100 MByte/s.
All types of gigabit ethernet have a payload ("netto data rate") of 125 Mbyte/s. Only some types use 8B/10B encoding and for those types the line rate must be 1.25 Gbit/s.
The common 1000BASE-T does not use 8B/10B coding. The symbol rate for 1000BASE-T is 125 MHz and 8 payload bits are transferred in each 12-bit symbol (3 bits per twisted pair).
Right. Thanks for correcting.The common 1000BASE-T does not use 8B/10B coding. The symbol rate for 1000BASE-T is 125 MHz.
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