4 Regulatory
Requirements
Due to the enormous cost of interrupted service and failed network equipment, telephony
service providers have adopted various specifications to help regulate the reliability and
performance of the telecommunications products that they purchase. In Europe and much
of the Far East, the most common standards are ITU-T K.20 and K.21. In North America,
most operating companies base their requirements on GR 1089, TIA-968 (formerly known
as FCC Part 68), and UL 60950.
Note: This section is a paraphrase of existing documents and does not cover the listed
regulatory requirements in their entirety. This information is intended to be used only
as a reference. For exact specifications, obtain the referenced document from the
appropriate source.
GR 1089–Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
ITU-T K.20 and K.21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
TIA/EIA-IS-968 (formerly known as FCC Part 68) . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
UL 60950 3rd Edition (formerly UL 1950, 3rd edition) . . . . . . . . . . . . . . . . . . . . . . 4-16
UL 497 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
UL 497A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
UL 497B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30
UL 497C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
Regulatory Compliant Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34
Surge Waveforms for Various Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37
© 2002 Teccor Electronics
4-1
http://www.teccor.com
+1 972-580-7777
®
SIDACtor Data Book and Design Guide
TECCOR [ TECCOR ELECTRONICS ]
