Cell Relay Archive

[Thomas Frieling <thomas.frieling@arcormail.de>]

Ron van Riet schrieb:
> (...)
> ... but usually AAL5 is used and a 48 bytes payload is correct ;-)
> 
But because the data packet length (plus AAL5 overhead) sometimes
cannot be divided by 48 an average of half a cell has to be taken
into account for every packet. E.g.: Bit Rate = 128 kbit/s,
average packet size = 500 Bytes => 32 packets / sec
128 kbit/s => 334 cells/sec  PLUS  around 16 cells/s (a half for
every packet)
This value depends upon the size distribution of the packet size
and can vary from 0 to the full packet rate.

> > Cell Rate = (bps/8)/53
> (...)

This is important when you calculate the cell rate that can be
carried by a physical interface or a leased line.
E.g. for OC3: 155.52 Mbit/s / 8 / 53 = 366792 cells/s

Cheers

Thomas Frieling