[SI-LIST] Re: Wireless board interconnect
- From: "Michael Khusid" <mkhusid@xxxxxxxxxx>
- To: <coupswork@xxxxxxxxxxxxx>
- Date: Wed, 8 Jan 2003 15:57:43 -0500
John,
Perhaps a silly solution but it certainly will be cheap.
IrDA devices are specified to work through air up to the distance of 6m.
An example of IrDA communication is an infrared link between a laptop
and a PDA. The price for the IrDA devices is incredibly low since they
are used in many consumer products.
www.irda.org
The only drawback is the speed: average is 115kbit/s and max speed is
4Mbit/s.
Mike
-----------------------------------------------------------------
Michael Khusid
Ansoft Corporation
SI/HF Application Engineer
25 Burlington Mall Road, 6th floor
Burlington, MA 01803-4100
Tel 781-229-8900 Ext. 34
Fax 781-229-8624
--------------------- http://www.ansoft.com ---------------------
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of John Coupland
Sent: Wednesday, January 08, 2003 2:07 PM
To: steve weir; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Wireless board interconnect
Steve,
Answers for your questions:
1. The signals all go from one board to the other
six.
2. Each board is really a module that can be
plugged in/ unplugged independently of the others.
A daisy chain cable across the front of the
modules has been considered but:
(a) it's tacky and in our application there's no
room for it on the front panel.
(b) stub length can aggravate SI and
(c) the ends of the daisy chain need termination
(if it's done in the module, then there needs to
be a provision for selectively terminationing
these signals on some boards and not on others--if
it's done on the cable, then the termination is
not at the far ends of the signal line).
Cabling inside the modules would be quite
difficult in that all 7 modules would need to be
pulled out somewhat together (it would be really
bad if someone forgot about this req't and tried
to pull out only one module).
Regards,
John
steve weir wrote:
>
> John,
>
> Before I can provide a reasonable answer, I have a couple of
questions:
>
> 1. Are these signals point to point, point to multipoint, or
multipoint to
> multipoint?
> 2. Is your requirement due to a need for galvanic isolation, or a lack
or
> connector pins / etch?
>
> If it is just galvanic isolation you are lookinf for, then take a look
at
> NVE's GMR isolators. If you need to reduce the wires then the
solution
> depends a lot on your answer to 1).
>
> http://www.nve.com/isindex.html
>
> Regards,
>
> Steve.
>
> At 01:41 PM 1/7/2003 -0800, you wrote:
>
> >Gurus,
> >I would like to send 12 signals from one VME/VXI
> >board to 6 adjacent boards without wires. Does
> >anyone know of an optical or electromagnetic or
> >any other means to send/receive these signals?
> >One of the signals is a clock.
> >Data rate is 50 to 100 MHz.
> >Delay between the sending board and the receiving
> >boards is not critical.
> >Delta delay differences between the nearest and
> >furthest "receiving" boards can be corrected
> >for...up to 5ns).
> >Signal skew and jitter, though, needs to be less
> >than 1ns.
> >The boards can have holes for the optical
> >"signals" to pass through.
> >Board spacing is 1.2"
> >All boards are identical, but the sending board
> >can be restricted to be at the end or the middle.
> >Actually, the sending board also needs to receive
> >the signals.
> >
> >Thanks,
> >John Coupland
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