From td@ph.ed.ac.uk Mon May 12 11:31:20 2008
Date: Tue, 22 Apr 2008 12:11:20 +0100 (BST)
From: Thomas Davinson <td@ph.ed.ac.uk>
To: "Coleman-Smith, PJ (Patrick)" <p.j.coleman-smith@dl.ac.uk>
Cc: "Lazarus, IH (Ian)" <i.h.lazarus@dl.ac.uk>
Subject: Re: AIDA clock and power cable


Hello Patrick

Apologies for the delay in replying to your proposal to use HDMI to
distribute clocks in AIDA.

Some questions.

Is this proposal to be regarded as the de facto standard for distributing
(BUTIS?) clock data to DESPEC/HISPEC detector systems (AIDA, n ToF,
4pi neutron, TAS etc.)?

Implicitly, the HDMI cable lengths will be long and distributed to a
variety of detector systems. I note that ground and shield (also ground?)
signal paths are defined so I can foresee ground loop problems (cf. AIDA
FEE gigabit data path via fibre) ... ???

Cheers

Tom

--- 8< -------------------------------------------------------------------------
Dr. Thomas Davinson
School of Physics,				Email: t.davinson@ed.ac.uk
The University of Edinburgh,			Tel: +44 131 650 5250
James Clerk Maxwell Building,			Fax: +44 131 650 7003
The King's Buildings,
Edinburgh. EH9 3JZ. UK.
--- 8< -------------------------------------------------------------------------

On Thu, 27 Mar 2008, Coleman-Smith, PJ (Patrick) wrote:

> Hi Tom and Ian,
> I am proposing to use the HDMI standard cable and connector parts for
> the clock and power distribution in the AIDA FEE.
> I have written a proposal which includes some background info on HDMI.
> Can you comment please.
>
> If this is OK then the FEE card will need only two wires , Gbit ethernet
> and HDMI.
>
> Thanks
> Patrick
>