long distance high speed serial link
long distance high speed serial link
(OP)
I'm looking into implementing a 16 Mbps (megabit/sec) serial link (one Tx, one Rx) that has to run at least 15 meters. Any suggestions?
Last time I checked this was beyond the capability of RS-422; has anybody made any improvements in drivers or receivers, or do those same old laws of physics apply?
I want a 'real-time' channel, so I'm trying to avoid something like Ethernet (100M, 1G, etc.) where I would have to re-sync the data in the receiver. Is a simple point-to-point solution available, or do I have to get more sophisticated?
Thanks,
John D
Last time I checked this was beyond the capability of RS-422; has anybody made any improvements in drivers or receivers, or do those same old laws of physics apply?
I want a 'real-time' channel, so I'm trying to avoid something like Ethernet (100M, 1G, etc.) where I would have to re-sync the data in the receiver. Is a simple point-to-point solution available, or do I have to get more sophisticated?
Thanks,
John D





RE: long distance high speed serial link
Note that you'll probably need to use higher-end cabling
TTFN
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RE: long distance high speed serial link
Everything in that paper looks good until I got to Figure 9.20 on p. 96; there they show RS-485 good for 40 Mbps on a 70 meter cable and 400 kbps on a 700 meter cable. Where did they get that data? That shows RS-485 could work for my application, but I've typically seen RS-485 spec'd at 1 Mbps or 1 km cables, but those are mutually exclusive specs.
Anybody have experience with M-LVDS or B-LVDS? Or 40 Mbps RS-485?
John D
RE: long distance high speed serial link
RE: long distance high speed serial link
There are lots of other options, like you could run multiple lines too. You could get a four channel transceiver and feed the data out in nibbles. Or, run two 4 channel chips and dump out 8 bits at a whack, which might be easier or much more efficient to implement. That would allow crap wire and 2Mbps speeds.
http://cds.linear.com/docs/Datasheet/485fh.pdf
52Mbps.
Keith Cress
kcress - http://www.flaminsystems.com
RE: long distance high speed serial link
At this point I'll keep exploring a single channel to keep the weight and size down on my cabling.
John D