Class A
(1) ISO/IEC 11801 designation for twisted-pair cabling rated to 100KHz. Used in voice and low-frequency applications. Comparable to TIA/EIA Category 1 cabling; not suitable for networking applications. (2) IP addresses that have a range of numbers from 1 through 127 in the first octet.
Class B
(1) ISO/IEC 11801 designation for twisted-pair cabling rated to 1MHz. Used in medium bit-rate applications. Comparable to TIA/EIA Category 2 cabling; not suitable for networking applications. (2) IP addresses that have a range of numbers from 128 through 191 in the first octet.
