Have you heard the rumors that Category 5 may not support asynchronous transfer mode, or ATM? I have seen several presentations where the question was raised: OCan unshielded twisted-pair Category 5 cabling support 155.52-Mbit/sec non-return to zero, or NRZ, signaling for the ATM Physical Medium Dependent Interface Specification for 155 Mbit/sec over Twisted Pair specification?O It seems that there is some usable energy emitted above 100 megahertz, to about 115 MHz, and this was the area of concern.
The rumors can be put to rest. George Dobrowski of Bell Communications Research and chair of the ATM Forum Tec