bps, the bit rate refers to transmission of bits per second
In the actual meaning of said bandwidth is 1Mbps 1M (Mbps megabits per second is not megabytes per second MBps)
PPS (packet per second), the unit common network throughput (i.e. the number of packets sent per packet), the network throughput performance usually (throughput) this indicator to measure .
Through to conversion, in order to get the actual value. However, we can look at terms in accordance with the conversion formula:
64KB / S = 64. 8 × (Kb / S) = 512Kb / 0.5Mb = S / S i.e., 64KB / S = 0.5Mb / S
128KB / S = 128 ×. 8 (Kb / S ) = 1024Kb / s = 1Mb / s i.e. 128KB / s = 1Mb / s
special Note:
(1) about 'bit (bits) / second (sec) in terms of the byte Description (bytes) / s (sec): line unit bps is, showing 'bit (bits) / second (sec), note the lowercase B; rate units displayed when a user downloads the internet often byte (bytes) / s (sec), is a capital letter B. Note The relationship between the bits and bytes 1Byte = 8Bits; IP header plus the amount of transfer, HTTP header and the like due to increase of network transport protocols, display 1KByte / s when the download rate, the actual rate of transmission line about 10kbps. For example: downloading is displayed 50KByte / s, the actual speed has reached a 500Kbps. Remember to pay attention to the unit! ! !
(2) User application rate is the broadband technology can achieve the maximum theoretical rate value, user access Shihai computer hardware and software configuration by the user, the location of the website browsing, impact on the site where the end of the bandwidth, so the user the rate at which the Internet is usually lower than the theoretical rate value.
(3) theoretically: 2M (i.e., 2Mb / s) is the theoretical rate of broadband: 256KB / s (i.e. 2048Kb / s), the actual rate of about 103--200kB / s; (which is the reason for performance by a computer user, the network device many factors influence the quality, resource usage, network peak, the site service capabilities, line attenuation, signal attenuation caused). 4M (i.e., 4Mb / s) is the theoretical rate of broadband: 512KB / s, the actual rate of about 200 --- 440kB / s.
Packet forwarding rate marked the size of the switch forwards the packet capabilities. General PPS bit units (packets per second),
General switch packet forwarding rate ranging in the tens to hundreds of Kpps Mpps. Packet forwarding rate refers to how many millions of data packet switches can forward per second (Mpps), namely the number of switches can be simultaneously forwarded packets.
Packet forwarding rate in packets as a unit reflects the exchange capacity of the switch.
Switch backplane bandwidth, a switch between the interface processor and a data bus or an interface card can be a maximum amount of data throughput. Switch backplane bandwidth marks overall data exchange capabilities, the unit is Gbps, also known as switching bandwidth, general switch backplane bandwidth ranging from a few to hundreds of Gbps Gbps. The higher a switch backplane bandwidth, the greater capacity can handle the data, but the design cost will be higher.
So, in general with the use bps capability Layer, Layer PPS capacity, support apparatus of the third layer switching, manufacturers will provide the forwarding rate and forwarding rate of the second layer a third layer, respectively.
QUOTE
the PPS calculation method:
(64+7+1+12)*8=672
A gigabit port wire-speed packet forwarding rate is 1.4881MPPS,
wire-speed packet forwarding rate Fast port is 0.14881MPPS, which is an international standard, but how come it?
Specific packets during transmission will be added in front of each packet 64 (preamble) Preamble is a 64-byte packet,
was only 512 'bit, but there are actually during transmission 512 + 64 + 96 = 672bit, i.e. the length of time a packet is actually
have 672bit Gigabit ports wire-speed packet forwarding rate = 1000Mbps / 672 = 1.488095Mpps, approximately equal 1.4881Mpps, in addition to 10 megabytes
of 0.14881Mpps
then the future is very simple, in fact, with a pps value of device parameters multiplied by 672 then directly converted into bps popular notion that we can understand the comparison.
General sales order to facilitate understanding of the calculations and an integer of 672 to 500 on the change.