First up, I would like to point out that I have NO hands-on experience of
X.25 - this is considering the question from the theoretical Cisco point of
view, which doesn't necessarily have anything to do with the real world.
I had a look in the Paquet BCRAN book, but couldn't find anything referring
to maximum bandwidth of X.25. I would check the RFCs, but due to a cable
problem internet access to most sites from Australia is currently woeful.
However, in the BCRAN book, there is the output of a 'show int' command,
which shows the bandwidth of a sample X.25 interface as 1544 Kbps.
Maybe some carriers will only provision X.25 at up to 64 Kbps, but I
suspect that the theoretical maximum speed is higher. X.21 will run at up
to 2Mbps, so possibly the answer is 'E - none of the above', but my guess
is that the Cisco answer is 1.544 Mbps.
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 23/11/2000
09:16 am ---------------------------
"Hawthorne, Mike MM" <[EMAIL PROTECTED]>@groupstudy.com on
23/11/2000 01:11:11 am
Please respond to "Hawthorne, Mike MM" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
To: "'xndr'" <[EMAIL PROTECTED]>
[EMAIL PROTECTED]
cc:
Subject: RE: x.25 question help
Dean, the maximum transmission rate for X.25 is 64Kbps.
This I have confirmed with a Telco.
Cheers
Mike
-----Original Message-----
From: xndr [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, November 22, 2000 12:22 AM
To: [EMAIL PROTECTED]
Subject: Re: x.25 question help
Hi!
X.25 is a set of CCITT recomendations for transmitting dato over PDNs
protocol suit, including OSI Layers: Physical, Datalink & Network.
The speed is on Physical Layer. At the physical layer, the X.25 standard
assumes an X.21 interface, but can also support V.35 and the EIA RS232-D
interfaces.
X.21 bis is up to 19,2 Kbps, V.35 is up to 2Mbps, and RS232 is up about
115,200 or something like this.
> I have a question about x.25 transmit rate as following:
> What is the maximum transmission rate for X.25?
>
> A. 56 Kbps
> B. 64 Kbps
> C. 128 Kbps
> D. 1.544 Mbps
>
> Thanks
>
> dean
>
>
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