Re: Communications Cable

Hi John,

If outer diameter shall be small and 0.5mm^2 is enough for all wires, Flamar has
2x2x0.5mm^2+shield cable with 120ohm impedance matching. Also SAB has S CB 627,
from which there are also smaller diameter variant(s). It is not clever idea to
use 100ohm cable, because with 120ohm terminators there'll intrinsically appear
over-/undershoots and with 100ohm terminators the fan-in of the entire network
will be close to the standardized limit, 45ohm, specified for the transceivers.
Usin dedicated CAN-cable will provide the best reliability and margin for external
disturbances and environmental threats.

Best regards,

-H

Heikki Saha, CTO
  M.Sc. Automation
  Dr.Tech. Electronics
TK Engineering Oy
Mail address:  P.O. box 810, FIN-65101 VAASA
Visit address: Yrittäjänkatu 15, FIN-65380 VAASA
+358 (0)50 588 6894
[email protected]
http://www.tke.fi/
http://www.canopen.fi/

----- Original Message -----
From: "John Dammeyer" <[email protected]>
To: [email protected]
Sent: Friday, July 4, 2014 9:26:47 PM
Subject: [CANLIST] Communications Cable




I’ve got a client who really doesn’t like prefab cables or the larger diameter Belden DeviceNet thin cable that is the proper 120 Ohms impedance. They’d like to use this Alpha Cable which is rated at 100 Ohms +/- 10. Bit rates are 250kbps, total length of network isn’t an issue. Of course the hardware which has embedded termination is terminated at 120 Ohms. 



http://www.mouser.com/ds/2/14/6459%20OR005-213474.pdf 



I’d like to be able to tell them not to use it but for a small network with minimal noise producing peripherals I’m running out of arguments. 



Any suggestions? 



Thanks 

John Dammeyer 





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