ISDN is a group of __________ standards relating to digital transmission across conventional copper wire telephone lines, as also other media.
A. CCITT
B. ITU
C. Both a & b
D. None of these
Answer:B
ISDN is a group of __________ standards relating to digital transmission across conventional copper wire telephone lines, as also other media.
A. CCITT B. ITU C. Both a & b D. None of these