ADTRAN 239 H4R Installation And Maintenance Practice page 11

Hdsl4 repeater
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The HDSL4 input and output ports are classified as Type 3 and 5,
as defined in Appendix B of GR-1089-CORE Issue 4, and meets the
lightning and power fault criteria with primary protectors that meet
any of the voltage limits of GR-974-CORE or GR-1361-CORE (i.e.,
carbon blocks, gas tubes, and solid state).
Current limiting protectors are not required.
61223445L2-5B
NOTE
NOTE
Introduction
5

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