**Tait Cyrus** (*hi!cyrus@hc.dspo.gov*)

*1 Apr 88 20:29:04 GMT*

**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Next message:**Drew Daniel Perkins: "Re: link level crap protection"**Previous message:**Drew Daniel Perkins: "Re: CRC calculation costs (was Re: SLIP working group? )"**Next in thread:**Steven P. Donegan: "Re: computing network loads"

I am looking for an equation that roughly computes the theoretical

load on a network given only the following information:

1) time over which the load is to be computed,

2) the number of packets seen in that time,

3) the number of bytes seen in that time.

Currently I am using something like:

num_bytes / (MBYTES_PER_SEC * time)

where I have arbitrarally picked MBYTES_PER_SEC to be 1 MegaBytes / sec.

Given a 10MBit (1.25 MByte) channel, subtracting overhead for preambles,

CRC bytes, collisions & the minimum time between packets, I came up

with the VERY approximate # of 1 MByte/sec.

I know that 1 Meg is a VERY magic number because there are many

different media that the data can be traveling across which will

effect this magic number.

So, back to the question. Is this a good approximation? What

values for MBYTES_PER_SEC should be used for the various medias,

i.e. think wire, thin wire, broadband, fiber, etc.?

I don't want to worry about distances between stations and the

media between them, just a rough approximation.

I have looked at the Blue Book to try to find a "nice" method

for computing network loads, but I am having a hard time trying

to come up with a better equation. Any help anyone could supply

me (as far a clarification of what the Blue Book is saying and

how to use that information) would be greatly appreciated.

Thanks,

-- @__________@ W. Tait Cyrus (505) 277-0806 /| /| University of New Mexico / | / | Dept of Electrical & Computer Engineering @__|_______@ | Parallel Processing Research Group (PPRG) | | | | UNM/LANL Hypercube Project | | hc | | Albuquerque, New Mexico 87131 | @.......|..@ | / | / e-mail: @/_________@/ cyrus@hc.dspo.gov

**Next message:**Drew Daniel Perkins: "Re: link level crap protection"**Previous message:**Drew Daniel Perkins: "Re: CRC calculation costs (was Re: SLIP working group? )"**Next in thread:**Steven P. Donegan: "Re: computing network loads"

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