Guidelines for Supporting Power Delivery Over Balanced Twisted-Pair Cabling
|Publication Date:||1 March 2017|
The purpose of this document is to provide guidelines that support a wide variety of safety extra low voltage (SELV) limited power source (LPS) applications using remote power supplied over balanced twisted-pair cabling. Examples of such applications include LAN devices, wireless access points, ANSI/TIA-862-B intelligent building systems devices like remote cameras, IP telephone and multimedia devices, all of which may be supported by standards such as IEEE Std 802.3 Clause 33 DTE Power via MDI or IEEE Std. 1394-2008.
The guidelines in this TSB are in addition to, and not in place of, the infrastructure specified in the ANSI/TIA-568 series of standards. The TSB covers the transmission and electrical parameters needed to support power over category 5e or higher performance twisted-pair cabling. This guideline covers different cable categories, cable types, installation and operating conditions including pathways and bundling. The TSB provides design, installation, and administration guidelines for effective deployment of remote powering over balanced twisted pair cabling. This TSB provides additional guidelines with respect to:
a) parameters needed for remote powering;
b) different installation conditions that require special considerations;
c) application considerations;
d) mitigation considerations; and
e) cabling configurations and related field test considerations
The cabling systems detailed in this TSB are designed to support SELV LPS power, as defined in IEC 60950-1. Safety and electromagnetic compatibility (EMC) requirements are outside the scope of this TSB.
NOTE: SELV requirements specify a maximum voltage of 60 V dc and LPS is understood in the applications referenced to be up to 100 VA supplied within 4-pair cabling.