MAO Qian. Revision of G.703 the specification of physical/electrical characteristics of hierarchical digital interfaces[J]. 2002,(1):1-8. DOI: 10.13756/j.gtxyj.2002.01.001.
Recommendation G.703 which is the physical/electrical characteristics of hierarchical digital interfaces
It is very useful and important standard in digital communications. Since it was published in 1972
it is revised many times. The last revision is cosented in Oct.2001 at SG15 2nd plenary meeting of 2001 to 2004 study period. This paper introduces the main revised contents.