Telecommunications Industry Association
TR41.9-10-05-010L
Document Cover Sheet
Project Number
PN-3-0016-RV3
Document Title
Surge Repetition number in TIA-968-B
Source
Littelfuse, Inc.
Contact
Name: Phillip Havens
Distribution
TR-41.9
Intended Purpose
of Document
(Select one)
X
Phone: 214.695.4559
Email: [email protected]
For Incorporation Into TIA Publication
For Information
Other (describe) -
The document to which this cover statement is attached is submitted to a Formulating Group or
sub-element thereof of the Telecommunications Industry Association (TIA) in accordance with the
provisions of Sections 6.4.1–6.4.6 inclusive of the TIA Engineering Manual dated March 2005, all of
which provisions are hereby incorporated by reference.
Abstract
Many industry Standards and Recommendations have multiple lightning repetitions so it is presented here
as consideration by TR41.9 to increase from the current single positive polarity and single negative
polarity lightning surge for equipment under test.
v1.0 – 20050426
Telecommunications Industry Association
TR41.9-10-05-010L
In the well known and often used GR-1089-CORE document, multiple repetitions are used when
lightning surges are applied to units under test. Table 4-2 from this document is summarized below and
shows a count as high as 25 surges in each polarity. These test conditions are applicable for Type 3
equipment defined as customer premises equipment “connected to metallic outside-plant cable
conductors”.
The ITU K21 Recommendation, which covers equipment installed in customer premises, outlines a
repetition of five positive and five negative surges.
The IEC 61000-4-5 also outlines a repetition of five positive and five negative surges with the following
waveshapes and repetition rates:
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Telecommunications Industry Association
TR41.9-10-05-010L
Therefore, after reviewing these national and international views of testing, it is recommended that the
TIA-968-B test conditions be increased from the current +1 and -1 surge to +5 and – 5 surges for Type A
and Type B longitudinal and metallic test conditions.
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