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KNS3250/R Users Guide - Rev. A00 Kingston Technology Company
Appendix B - Cabling Guidelines 39
UTP Cable Rating Codes
UTP cables meet different UL-NEC requirements based on cable-jacket quality.
Below is an explanation of the rating codes for each cable type.
UL – The National Electrical Code (NEC), published by the National Fire
Protection Association (NFPA), details advisory safety considerations for electrical
wiring. NEC Article 800 Communications Cables are manufactured to meet these
different cable types.
1. CMP – Cables meeting type CMP requirements are suitable for installation in
ducts and plenums without the use of conduit. These cables are designed for re
resistance and low-smoke producing characteristics.
2. CMR – Riser type cables are engineered to prevent the spread of re from oor
to oor and are suitable for vertical shaft applications.
3. CM – Cables for general building wiring. CM cables are used in areas other
than plenums and risers. These cables are resistant to the spread of re and pass
the UL 1581Vertical Tray Flame Test.
4. MP, MPR & MPP – Within Article 800, the Multi-purpose Cables Category
allows conditional substitutions between different cable types & are restricted
by number, AWG size and stranding of the cable conductors.
Terms You Should Be Familiar With
1. BACKBONE WIRING – The physical/electrical interconnections between
telecommunications closets and equipment rooms.
2. COMPLIANCE – A wiring device that meets all characteristics of a standard
is said to be in compliance with that standard.
3. PREMISE WIRING – The entire wiring system on the premises especially
the supporting wiring that connects the communications outlets to the network
interface jack.
4. NEAR-END CROSSTALK (NEXT) – In wires packed together within a
cable, the signals generated at one end of the link can ush out the weaker
signals coming back from the recipient.