Re: [SI-LIST] : FCAL DB9 cable shield

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From: David Instone (david_instone@uk.xyratex.com)
Date: Wed Nov 17 1999 - 01:52:42 PST


Right chaps this is from the horses mouth,
As the current editor of the sections of FC-PI that deal with this.
Pasted from 99-066v4.pdf on www.t11.org follow the DOCS link.

 'TxRx Connections which are composed entirely of electrical conducting
media shall be applied only to homogenous ground applications such as
between devices within an enclosure or rack, or between enclosures
interconnected by a common ground return or ground plane. This
restriction minimizes safety and interference concerns caused by any
voltage differences that could otherwise exist between equipment
grounds.'

(TxRx Connection = complete signal path between a transmitter in one FC
device and a receiver in another FC device. FC-PH-3 clause 3.1.13)

and

'The cable shield(s) on inter-enclosure cables shall be earthed through
the bulkhead connectors on both the transmitter and receiver ends as
shown in Figure 28, Figure 29 and Figure 32. On intra-enclosure
connections these shields shall be tied to signal ground.'

I should also point out that these words are also in the existing
FC-PH-3 ANSI standard.

For those who are really interested then I suggest you subscribe to the
t11.2 reflector.

majordomo@dpt.com
subscribe t11_2

-- 
Regards

Dave Instone. Compliance Engineer Test Systems, MP24/22 Xyratex, Langstone Rd., Havant, Hampshire, P09 1SA, UK. Tel +44 (0)1705 443071 (direct line) From 22 Nov 99 use +44 (0)23-92-496862 Fax +44 (0)23-92-499315 http://www.xyratex.com Tel: +44 (0)23-92-486363 ________________________________________________________ Chris Cheng wrote: > > dear friends, > recently there seems to be a lot of discussion in differential > signaling. i would like to try a similar questioin, does anyone > knows if the shielding for the non-equalized FCAL DB9 cable is > shorted to the plug or is it just floating. it sounds like the > later is better for EMI. > thanks in advanced. > chris > > **** To unsubscribe from si-list: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at

**** To unsubscribe from si-list: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu/si-list ****


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