[mrtg] Re: conversions for MaxBytes (fixed)

[LARRY KAUFFMAN]

Yes, the actual payload carrying bandwidth on a T1 is 192KB/s. It doesn't matter if the T1 is channelized or clear channel, you will always have 8Kb/s for framing.

>>> Dan Wentzel <danw at bas.army.mil> 02/15/00 02:23PM >>>
So, the actual usable bandwidth to be entered into MaxBytes is 192KB/s, NOT 193KB/s.

Is this true also of an UNstructured T-1?  I'd have to check my books, but I believe it is
possible to do away with the framing if you do not need 24 DS0's, and use the entire
line speed of 1.544Mb/s for yourself.  Thus, it depends on how your particular T1 is provisioned?

(If you wanna get picky about ~0.5% difference....)

DJW

-----Original Message-----
From:	Rippe, Mark (CCI-Warwick) [SMTP:Mark.Rippe at cox.com] 
Sent:	Monday, February 14, 2000 3:53 PM
To:	'mrtg at list.ee.ethz.ch' 
Subject:	[mrtg] Re: conversions for MaxBytes (fixed)

oops.
the first line has a typo. (it's monday)
there is only one framing bit

	the t1 proto goes;
	1 framing bit					1 bit		=1 bit
	8 bits times 24 channels		192 bits		=193 bits
	1 framing bit			1 bit		1 bit	=	194bits
	8 bits times 24 channels		192 bits		=386 bits
	1 framing bit			1 bit		1 bit	=	387bits
	8 bits times 24 channels		192 bits		=579 bits
	1 framing bit			1 bit		1 bit	=	580bits
	8 bits times 24 channels		192 bits		=772 bits
	1 framing bit			1 bit		1 bit	=773.bits
	8 bits times 24 channels		192 bits		=965 bits
	1 framing bit			1 bit		1 bit	=	966bits
	8 bits times 24 channels		192 bits		=1158 bits
	1 framing bit			1 bit		1 bit	=	1159bits
	8 bits times 24 channels		192 bits		=1351 bits
	1 framing bit			1 bit		1 bit	=	1352bits
	8 bits times 24 channels		192 bits		=1544 bits


mark.rippe at cox.com 

"Elegance is for Tailors!"
Albert Einstein on mathematics


> -----Original Message-----
> From:	Rippe, Mark (CCI-Warwick) 
> Sent:	Monday, February 14, 2000 10:41 AM
> To:	mrtg at list.ee.ethz.ch 
> Subject:	[mrtg] Re: conversions for MaxBytes
> 
> the missing 8k are framing bits.
> 
> the t1 proto goes;
> 1 framing bit	1 framing bit			1 bit		1 bit
> 8 bits times 24 channels		192 bits		193 bits
> 1 framing bit			1 bit		1 bit	194 bits
> 8 bits times 24 channels		192 bits		386 bits
> 1 framing bit			1 bit		1 bit	387 bits
> 8 bits times 24 channels		192 bits		579 bits
> 1 framing bit			1 bit		1 bit	580 bits
> 8 bits times 24 channels		192 bits		772 bits
> 1 framing bit			1 bit		1 bit	773.bits
> 8 bits times 24 channels		192 bits		965 bits
> 1 framing bit			1 bit		1 bit	966 bits
> 8 bits times 24 channels		192 bits		1158 bits
> 1 framing bit			1 bit		1 bit	1159 bits
> 8 bits times 24 channels		192 bits		1351 bits
> 1 framing bit			1 bit		1 bit	1352 bits
> 8 bits times 24 channels		192 bits		1544 bits
> 		
> 
> mark.rippe at cox.com 
> 
> "Elegance is for Tailors!"
> Albert Einstein on mathematics
> 
> 
> > -----Original Message-----
> > From:	Alex van den Bogaerdt [SMTP:alex at slot.hollandcasino.nl] 
> > Sent:	Monday, February 14, 2000 10:11 AM
> > To:	CCongdon at WorkNET.net 
> > Cc:	mrtg at list.ee.ethz.ch 
> > Subject:	[mrtg] Re: conversions for MaxBytes
> > 
> > Congdon, Christopher wrote:
> > > 
> > > 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!
> > 
> > I think it is the other way around...  If you provide 24 channels, you
> > need a signalling protocol.  Just an assumption: this takes 8k ?
> > 
> > If I use an E1 interface to provide 64k ISDN channels I get a total
> > of 30 B channels and 1 D channel, 64k each.  In this case, 64k gets
> lost.
> > 
> > regards,
> > -- 
> >    __________________________________________________________________
> >  / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
> > | work                                                         private |
> > | My employer is capable of speaking therefore I speak only for myself |
> > +----------------------------------------------------------------------+
> > 
> > --
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