[Ikeda, Yamamoto-san, Oshino-san]

This is a continuation of K-Log#20498.

[Work Details]
1. Replacement of LAN cables in DGS network

 The cables were replaced with defective cables in the following racks.
 N1, B1, C1, C3, and c4 Racks
 The criteria used to determine a cable as defective is a non-twisted cable as indicated by the results of the K-Log#20008 survey.

2. all of K-Log#20498's connections have been restored.
 > Finally, k1ioo, k1ioo1, k1imc in the C1 rack and k1bs in the C2 rack were connected to the DAQ switch in the B1 rack directly.

 Confirmation Result:
  A DAQ error (0x4000) was observed to occur approximately once every minute.
  No improvement was observed.

3. The DAQ network switch was connected in 3 levels, but the connection was changed to 2 levels this time.
 DAQ in racks C1, C2, and C3 are connected to the DAQ switch in rack B1 with a metal cable.
 k1dc0, both ends and two fronts, and X500 were changed to be connected directly to the switch in the B1 rack via optical.

 Verification Result :
  There was no improvement in the DAQ error (0x4000).

4. After the work, we reverted some error countermeasures for K-Log#20498 connection.
 > Finally, k1ioo, k1ioo1, k1imc in the C1 rack and k1bs in the C2 rack were connected to the DAQ switch in the B1 rack directly.
 Finally, only k1ioo, k1ioo1, and k1imc in the C1 rack were connected to the B1 DAQ Rack directly.
 The k1bs in the C2 rack was not returned.

 Check Result :
  We confirmed that the error did not occur as frequently as before we started the work.
  We will see how it goes until tomorrow.