Wednesday, May 9, 2012

PPS BPS calculator

pps = packet per second
bps = bit per second
byte = 8 * bit
pps * average packet size (byte) = bps

Here is a handy tool: Bits per second to packets per second converter

Often vendors such as our favorite Cisco specify device performance as packets per second, so we don't need to bother about packet size mentioning because pps is rather a characteristic of device's (processor, bus, ASICs) computing power. Packets per second more or less still the same with different packets size. But it is not very convinient to deal with pps in a real life because we have to know "real" device performance in our network. So we have to do two things:

1) Determine the average packet size which is specific for our network. For example traffic profile for our network could be 30% ftp-data (large packet at 1500 bytes) and 70% VoIP-data (a lot of small packets at 64 bytes) so our average packet size is about 800 bytes.

2) Calculate with simple formula how much there will be Megabits per second (Mbps) if our average packet size is 800 bytes and device performance is, lets say, 100 kpps (one hundred thousand of packets per second)

From: Bits per second to packets per second converter

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