[Ronja] What is holding back 100 mbps

[Thomas Egenhofer]

> Hi all,
> The discussion so far
> 
> Saad Shakeel says
>     2. Need equally fast photodiode and 74xx ics
>     3. faster ne592 alternate as it only works at 10nS
>     4. we might be able to use the bf908 since it supports upto 1 GHz.
> 
> Thomas Egenhofer says
> - Think over encoding technique
>     1. 2 level encoding at 100 mbps could run into problems.
>     2. 2 level encoding would require rise and fall times of .5ns !
sorry.. looks like a zero shifted around in my brain. should be 5ns i
think..


>     3. MLT3, coming from the LAN card could be used (30ns), requiring in
> rise and fall times of 15ns of LED
>     4. It would require redesigning the transmitter
i dont belive you can skipp this if used with 2level encoding^^ also
keep in mind that signal-times of 10ns are quite tricky to handle. even
fast logic can easily produce a delay of up to 15ns which can cause many
problems with signal-timing in general.

>     5. He already has a prototype MTL3 reciever at
> http://home.arcor.de/positiveelectron/files/MLT-3-receiver.png
> 
> Meanwhile CD930 shows us he already has a 100 Mbps version, but alas the in
> the clutches of proprietary license
>     He has videos at
>     http://www.youtube.com/watch?v=9h3hDm32kv4
>      http://www.youtube.com/watch?v=YcjaJhMHcNk
> 
> and even better people like Jim Thompson are waiting to be convinced to
> finance a 100 Mbps version.
> 
> 
> What are we waiting for ?