Hi Subbi,
That would still only leave 184 * 8000 = 1472000 bps or (1472000/1024)
1437.5 kbps for data.
Ole
~~~~~~~~~~~~~~~~~~~~~~~~~~
Ole Drews Jensen
Systems Network Manager
CCNA, MCSE, MCP+I
RWR Enterprises, Inc.
[EMAIL PROTECTED]
~~~~~~~~~~~~~~~~~~~~~~~~~~
-----Original Message-----
From: Subramanian Nallasivam [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 11, 2000 3:54 PM
To: Ole Drews Jensen
Cc: [EMAIL PROTECTED]
Subject: Re: Some ISDN PRI questions
Hi,
I am new to ISDN concepts, but here they are....
We have 23 DSO for carrying data. Each channel carries 8 bit word or
something. So
23 * 8 = 184
One channel is used for carrying signal . So the number comes out to be
184 + 8 = 192
Since 8000 samples are sampled per second , the calculation comes to be
192 * 8000 = 1536 Kbps.
T1 uses in-band signalling ( uses same data channel for signalling also)
where
as ISDN PRI uses out-band signalling (uses seperate channels for signals).
I am new to ISDN cocepts. If I am wrong please correct me.
Thanks,
-Subbi.
Ole Drews Jensen wrote:
> The ISDN BRI has two 64 kbps B channels and one 16 kbps D channel. That
> gives us a maximum of 128 kbps bandwidth for data which makes sense.
>
> The ISDN PRI has twenty three 64 kbps B channels and one 64 kbps D
channel.
> That should give us a maximum of 1472 kbps bandwidth for data, and not
1536
> kbps as normally specified unless it is possible to use the D channel for
> data too ???
>
> The ISDN PRI in Europe has thirty 64 kbps B channels and one 64 kbps D
> channel. That should give us a maximum of 1920 kbps for data, and not 2048
> kbps as normally specified even if the D channel is used for data too.
>
> Are these numbers just used because it's easier to remember the 1536 and
> 2048 values, or is there a hidden factor here???
>
> A last question: I sometimes hear people refer to an ISDN PRI as a T1. The
> T1 has the same amount of channels and bandwidth, so the question is - are
> there really a big difference between these two specifications, or is it
> more or less the same???
>
> Some or all of these questions might be answered later on in my book, but
I
> can't wait any longer - I want to know NOW :-)
>
> Thanks for any comments on this.
>
> Ole
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~
> Ole Drews Jensen
> Systems Network Manager
> CCNA, MCSE, MCP+I
> RWR Enterprises, Inc.
> [EMAIL PROTECTED]
> ~~~~~~~~~~~~~~~~~~~~~~~~~~
>
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