Thanks Jay,
Ole
~~~~~~~~~~~~~~~~~~~~~~~~~~
Ole Drews Jensen
Systems Network Manager
CCNA, MCSE, MCP+I
RWR Enterprises, Inc.
[EMAIL PROTECTED]
~~~~~~~~~~~~~~~~~~~~~~~~~~
-----Original Message-----
From: Jay Hennigan [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, July 12, 2000 12:17 AM
To: Ole Drews Jensen
Cc: 'Subramanian Nallasivam'; [EMAIL PROTECTED]
Subject: RE: Some ISDN PRI questions
On Tue, 11 Jul 2000, Ole Drews Jensen wrote:
> Hi Subbi,
>
> You are dragging me out in orbit now, but I'll try to hang on.
>
> To get back to the ISDN PRI...
>
> The 8000 samples, are you sure that it's not 8 k-samples (8*1024) = 8192
> samples???
In the telco world, 1K = 1000. In the data world 1K = 1024.
ISDN and the DS-n standards came from the telco world. :-)
> That would make sense since the 192 bits (24*8) multiplied with 8192
equals
> 1572864 which again equals 1536 kbps (1572864/1024). That brings us back
to
> 24 channels where the last one is only used for signaling - not data.
192 bits multiplied by 8000 = 1536000. Add in 8000 for framing, and you
have 1544000, the clock rate for DS-1.
The proper way to think or this is really:
8000 samples per second of 8 bit resolution = 64000 bits per second,
which equals one channel, or one DS-0. 24 channels of 64000 bits
equal 1536000 bits per second (or 192000 bytes). Plus 8000 bits per
second for framing. Viola! (a stringed instrument appears mysteriously
out of thin air) 1,544,000 bits per second = DS-1.
--
Jay Hennigan - Network Administration - [EMAIL PROTECTED]
NetLojix Communications, Inc. NASDAQ: NETX - http://www.netlojix.com/
WestNet: Connecting you to the planet. 805 884-6323
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