[mrtg] Re: conversions for MaxBytes

[Congdon, Christopher]

Acutally, I'd like to know where 1.544 comes from. From what I understand, a
T1 is composed of 24 64Kb channels. That makes 1.536.  I would like to know
where the extra 8K comes from!

Christopher


-----Original Message-----
From: Alex van den Bogaerdt [mailto:alex at slot.hollandcasino.nl]
Sent: Monday, February 14, 2000 4:24 AM
To: listuser at vinnie.ksu.ksu.edu
Cc: mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: conversions for MaxBytes


Justin Shore wrote:
> 
> Could someone help me with converting speeds into MaxBytes?  I'm 
> having a terrible time getting it straight in my head.  For example, 
> a T1 = 24ch x 64kbits = 1536kbits / 8 = 192kbytes = 196608 bytes, 
> right?  The config page says 193000 for a T1.  I also have a seperate 
> 16 channels of a T1 to figure, a few BRIs, DSL, and ethernet--10 & 
> 100.  Should I use my values or should I use whatever version of math 
> got the speeds on the config page?

Write down B for byte and b for bit.

Find out the speed of the interface in bits.  Do not estimate by taking
the number of 64kbps channels, find out the real value.

You need to forget about 1024 == kilo.  Kilo == 1000.  Mega==1000k.

10 mbps ethernet:  10,000,000 bps -> 1250000 Bps -> 1250 kBps
100 mbps: 12500 kBps or 12.5 mBps

T1: 1544 (!!!) kbps -> 1544000 bps -> 193000 Bps -> 193 kBps
E1: 2 mbps -> 2000000 bps -> 250 kBps


regards,
-- 
   __________________________________________________________________
 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
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