[Halld-controls] Accelerator telecom in Hall D

[Elliott Wolin]

Hi,

I just talked with Brad Cumbia from Accelerator, who is responsible for 
Accelerator networking.

Recall that Accelerator will be managing a number of devices in Hall D 
and the Tagger area, including four power supplies.  They plan to locate 
EPICS VME crates near the devices and use VME modules to communicate 
with them.  The VME cpus need network connections, and the plan is that 
Accelerator will run their own networking system and not use the Hall D 
system.  They further will manage the VME crates and cpu's.  They will 
have their own network switch in the Telecom room.

We would like to minimize the number of copper cables that run into the 
hall.  E.g. we will only run fiber from our Rack Room to the hall, then 
convert to copper to connect to devices in the hall.

Brad has agreed to follow the same strategy, i.e. to place another of 
their switchs in the hall and connect to it via fiber from their switch 
in the Telecom room.

Since we plan to run a lot of fiber between the Rack Room and the hall 
it makes sense to run an additional couple of pairs for them so they 
won't have to arrange for a special run from the Telecom room to the 
hall (Bryan...will you be installing fiber from the Telecom room to the 
hall for another purpose?).   Instead they'll use some of the fibers we 
plan to run from the Telecom room to the Rack room, patch into our big 
fiber bundle going down to the hall, then connect to their switch from 
the patch panel in the hall.

Thus they will not need to run any fibers at all, and all we have to do 
is add a a few pairs to the large bundles we already plan to run.

Note that we don't have well developed plans for the Tagger area, and 
perhaps copper runs from the Tagger service building to the Tagger area 
are not a concern, not sure...

Thoughts, comments...?

Thanks,


-- 

				Sincerely,
					Elliott


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  Those raised in a morally relative or neutral environment will hold
		    no truths to be self-evident.
				

Elliott Wolin
Staff Physicist, Jefferson Lab
12000 Jefferson Ave
Suite 8 MS 12A1
Newport News, VA 23606
757-269-7365

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