The best replacement for oc3 is ds3.

The best alternatives to oc3 are rated as following:
★★★★★  ds3
★★★  t3
★★★  oc12
★★★  t1
★★★  oc3c
★  gige
★  stm 1
★  stm1
  dc3
  sts3
  oc2

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No companions for oc3 have been suggested so far.
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Google Trends

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oc3
ds3
t3