Convert Bits/sec to Hz

depends how you do the data framing too, how do you tell if a bit is a
one or zero?

Grant.

Bit values may be inferred from the specified voltage levels,
as in stabdard CMOS - analogous to a timing diagram.

On Aug 8, 9:29 am, Grant <o...@grrr.id.au> wrote:

depends how you do the data framing too, how do you tell if a bit is a
one or zero?

Grant.

On 08/06/2010 03:42 AM, Daku wrote:
(top posting fixed)
On Aug 6, 3:25 am, "k...@att.bizzzzzzzzzzzz"<k...@att.bizzzzzzzzzzzz
wrote:
On Fri, 06 Aug 2010 06:49:33 +1000, Grant<o...@grrr.id.au> wrote:
On Thu, 5 Aug 2010 16:19:00 -0400, "Tom Biasi"<tombi...@optonline.net> wrote:

"Daku"<dakup...@gmail.com> wrote in message
news:1f08b0d9-9d6a-4cf3-93cc-19803e81b278_at_y32g2000prc.googlegroups.com...
I understand that they are different domains (Hz - analog and bits/sec
- digital), how would one
convert e.g., 1Gbit/s to corresponding Hertz
frequency ?

Hi,
Tim is quite knowledgeable on these subjects and gave some usefull info but
maybe your question is not quite so deep.
Hertz is used to describe cycles/second (cycles per second). If you allow it
to mean events per second then a bit can be an event.
So 1Gb/sec is 10^9bits / sec or 1 Ghz.
This is for mental clarity and the actual units may vary.

Yes, Tim touches on the old baud rate (symbol rate) vs frequency that
you're suggesting as the simple answer.

Both are not incorrect (double negative only to show grey area).

For example 100Mbps network link bangs four symbols on each of 1/25MHz
to get the speed, and Gbps copper network links don't run at 1GHz, they
run slower speed, using a couple pairs in each direction.

So, in this case, context matters.

Where I said symbols, Tim said constellation, Tim is more accurate :)

Not really. Symbols are the stars in a constellation of stars. The symbol is
the basic unit of information transferred. A constellation is a
representation of the possible physical values (voltage, frequency, phase,
whatever).

A little more specifically, a symbol may be a specific value in the
constellation or a transition from the current point to another.

Thanks to all for your feedback. I had thought
about the baud rate idea that Tim elaborated
on, but the context in which I asked this question
was Ethernet bits going from the MAC layer
to the PHY layer at say 1 Gb/s or more (for the
newer standards).

GB Ethernet uses 5-level signaling on four pairs of wires. I can't find
a reference that gives the symbol rate; without forward error correction
(FEC) it could be as low as 110MBaud. I don't believe this at all-- I'm
sure there's at least some coding to keep the average voltage at 0 for
transformer coupling, for error detection, and maybe even for error
correction.

But surfing on Wikipedia for a few moments didn't tell me -- you'll have
to dig up the appropriate standard and take a look for yourself!

http://en.wikipedia.org/wiki/Ethernet_over_twisted_pair has a
discussion, and a link to IEEE 803.

What exactly are you trying to do here? a bit of background may help
answer your question. E.g. are you trying to send data down a cable? if
so will it be synchronous or asynchronous? Is it just one way
communication between two devices?
I am creating Verilog models of high-speed Ethernet protocols (e.g.,
= 1Gbit/sec). All data movement is in between the sub-circuits of
an integrated circuit. However, some of the IEEE specification

Gareth.

PS top posting, that's posting your reply above the relevant text, can
make threads difficult to follow. it is usually clearer to put your
reply below the relevant text in the post you are replying to.