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Entry  Wed May 15 17:17:05 2013, Jamie, Summary, CDS, Accounting of ADC/DAC channel availability 
    Reply  Wed May 15 17:38:49 2013, Jamie, Summary, CDS, AA/AI requirements 
    Reply  Wed May 15 19:32:04 2013, rana, Summary, CDS, Accounting of ADC/DAC channel availability 
       Reply  Wed May 15 22:47:11 2013, Jamie, Summary, CDS, Accounting of ADC/DAC channel availability 
Message ID: 8580     Entry time: Wed May 15 17:17:05 2013     Reply to this: 8581   8583
Author: Jamie 
Type: Summary 
Category: CDS 
Subject: Accounting of ADC/DAC channel availability 

We need ADC and DAC channels for a couple of things:

  • POP QPD: 3x ADC
  • ALS PZTs: 3x 2x 2x DAC (three pairs of PZTs, at ends and vertex, each with two channels for pitch and yaw)
  • Fibox: 1x DAC

What's being used:

  • c1iscex/c1iscey:
    • DAC_0:   7/16 = 9 free
    • ADC_0: 17/32 = 15 free
  • c1sus:
    • DAC: ?
    • ADC: ?
  • c1ioo
    • DAC_0:   0/16 = 16 free ?? This one is weird. DAC in IO chassis, half it's channels connected to cross connect (going ???), but no model links to it
    • ADC_0: 23/32 = 9 free
    • ADC_1:  8/32 = 24 free
  • c1lsc
    • DAC_0: 16/26 = 0 free
    • ADC_0: 32/32 = 0 free

What this means:

  • We definitely have enough DACs for the ALS PZTs.  The free channels are also in the right places: at the end stations and in the c1ioo FE, which is close to the PSL and hosts the c1als controller.
  • We appear to have enough ADCs for the QPD in c1ioo.
  • We don't have any available DAC outputs in c1lsc for the Fibox.  If we can move the Fibox to the IOO racks (1X1, 1X2) then we could send LSC channels to c1ioo and use c1ioo's extra DAC channels.

Of course we'll have to investigate the AA/AI situation as well.  I'll try to asses that in a follow up post.

PS: this helps to identify used ADC channels in models:

grep adc_ sus/c1/models/c1scx.mdl | grep Name | awk '{print $2}' | sort | uniq

 

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