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lbaops:onedasat512 [2007/02/28 14:27]
jlovell
lbaops:onedasat512 [2015/12/18 16:39] (current)
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-====== 2 x 64 MHz bandwidth (512 Mbps) from a single DAS====== +====== 2 x 64 MHz bandwidth (512 Mbps) from a single DAS ====== 
-\ + 
-The [[http://​www.atnf.csiro.au/​vlbi/​evlbi/​recorder/​corrout.jpg | correlator output ports]] on the DAS can\ +The [[http://​www.atnf.csiro.au/​vlbi/​evlbi/​recorder/​corrout.jpg | correlator output ports]] on the DAS can 
-be configured to output 2\ +be configured to output 2 
-bit 64 MHz data directly (with no digital filtering). This allows data\ +bit 64 MHz data directly (with no digital filtering). This allows data 
-rates of 512 Mbps from a single DAS (twice that from the S2 output\ +rates of 512 Mbps from a single DAS (twice that from the S2 output 
-port). As the signal format from the correlator ports are different\ +port). As the signal format from the correlator ports are different 
-from the S2 port a patch cable is needed to produce a pin assignment in\ +from the S2 port a patch cable is needed to produce a pin assignment in 
-the S2 specs. The BG3a cable does this. This cable\ +the S2 specs. The BG3a cable does this. This cable 
-has 3 inputs and one\ +has 3 inputs and one 
-output. Two of the inputs are 20 way twist and flat cables which\ +output. Two of the inputs are 20 way twist and flat cables which 
-[[http://​www.atnf.csiro.au/​vlbi/​evlbi/​recorder/​bg3_connected.jpg | connect into the two correlator output ports on the back of the DAS]]\ +[[http://​www.atnf.csiro.au/​vlbi/​evlbi/​recorder/​bg3_connected.jpg | connect into the two correlator output ports on the back of the DAS]] 
-(this supplies the sampled 64 MHz data from the two IFPs and the 32 MHz\ +(this supplies the sampled 64 MHz data from the two IFPs and the 32 MHz 
-reference clock from the first correlator output). The third input\ +reference clock from the first correlator output). The third input 
-plugs into the S2 Csa output of the DAS to supply the 1 PPS tick. The 50\ +plugs into the S2 output of the DAS to supply the 1 PPS tick. The 50 
-way twist-and-flat output from the BG3a then plugs directly into the VSIC board, bypassing the external connector. For\ +way twist-and-flat output from the BG3a then plugs directly into the VSIC board, bypassing the external connector. For 
-this recording mode, vsib_record needs to be run in mode "​2"​ (16 bits\+this recording mode, vsib_record needs to be run in mode "​2"​ (16 bits
 per sample). per sample).
  
lbaops/onedasat512.1172633265.txt.gz · Last modified: 2015/12/18 16:39 (external edit)