Q:

ISDN is a group of __________ standards relating to digital transmission across conventional copper wire telephone lines, as also other media.

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ISDN is a group of __________ standards relating to digital transmission across conventional copper wire telephone lines, as also other media.


  1. CCITT
  2. ITU
  3. Both a & b
  4. None of these

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 (c).Both a & b

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