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Message ID: 3995     Entry time: Tue Nov 30 12:25:08 2010
Author: josephb 
Type: Update 
Category: CDS 
Subject: LSC computer to chassis cable dead 

Problem:

We seemed to have a broken fiber link for use between the LSC and its IO chassis.  It is unclear to mean when this damage occurred.  The cable had been sitting in a box with styrofoam padding, and the kink is in the middle of the fiber, with no other obvious damage near by.  The cable however may have previously been used by the people in Downs for testing and possibly then.  Or when we were stringing it, we caused a kink to happen.

Tried Solutions:

I talked to Alex yesterday, and he suggested unplugging the power on both the computer and the IO chassis completely, then plugging in the new fiber connector, as he had to do that once with a fiber connection at Hanford.  We tried this this morning, however, still no joy.  At this point I plan to toss the fiber as I don't know of any way to rehabilitate kinked fibers.

Note this means that I rebooted c1sus and then did a burt restore from the Nov/30/07:07 directory for c1suspeics, c1rmsepics, c1mcsepics.  It looks like all the filters switched on.

Current Plan:

We do, however, have the a Dolphin fiber which originally was intended to go between the LSC and its IO chassis, before Rolf was told it doesn't work well that way.  However, we were going to connect the LSC machine to the rest of the network via Dolphin.

We can put the LSC machine next to its chassis in the LSC rack, and connect the chassis to the rest of the front ends by the Dolphin fiber.  In that case we just need the usual copper style cable going between the chassis and the computer.

 

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