SERIES K SUPP 21 - : References

This document references the following standards:
IEC 60664-1
IEC 60950-1
IEEE 802.3
ITU-T HDBK PTL CHAPTERS 9 AND 10
ITU-T K.126
ITU-T K.143
ITU-T K.21
ITU-T K.44
ITU-T K.66
ITU-T K.98
ITU-T K.99
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