From: Charles Huang (routing@icharles.no-ip.com)
Date: Wed Nov 06 2002 - 22:29:16 GMT-3
Peter,
Thank You for your information.
But I found that the 1 DS3 frame has 4760 bits. (4703 bits for data, 56 bits
overhead)
And the bandwidth for DS3 is 44.736Mbps.
4760 * 8000 just doesn't add up up 44.7M
but on DS1, 193 bits/frame * 8000 frames/sec does equal to 1.544Mbps
Charles
-----Original Message-----
From: Peter [mailto:g4bbu@whittle-systems.demon.co.uk]
Sent: Wednesday, November 06, 2002 1:57 PM
To: Charles Huang
Cc: CCIE
Subject: Re: How many DS3 frames per second ?
Charles,
There are 8000 per second. In the Telco world everything is keyed into
voice requirements. Speech needs some 3 - 4 kilohertz bandwidth, Nyquist
theorem states that you need to sample at atleast twice the highest
frequency => you need 8000 samples per second.
This applies to DS0, (8000 x 8bits = 64 k), DS1, DS3, STM-1 (OC3), STM-
4, STM-16, or even STM-64 (10 GBits/S).
There are always 8000 frames per second, what changes as you go up the
higher-archie in speed is the size of the frame.
Hope this helps
Peter
In message <MOENKIKMFEOHGBMMOGLPIEBECJAA.routing@icharles.no-ip.com>,
Charles Huang <routing@icharles.no-ip.com> writes
>All,
>
>I know that there are 8000 DS1 frames per second.
>Does anybody know how many DS3 frames are there per second?
>
>
>Thanks
-- Peter
This archive was generated by hypermail 2.1.4 : Tue Dec 03 2002 - 07:22:54 GMT-3