To: All At&T Installation Suppliers s1

AT&T ENGINEERING REQUIREMENT CHANGE NOTIFICATION - ATT-TP-76400-156 TO: ALL AT&T ENGINEERING SUPPLIERS Date: 01/05/2016

EFFECTIVE DATE: 5 days from posted date or as per Supplier’s Contract

Submitter’s Name: Charles Matlack

TP: TP76400 Subject: Protected AC Load Action: Add: Modification: Delete:

Section: 12 Section Title: Power Systems Subsection: 7 Section Title: Inverters and UPS Systems Subsection: 7.1 Subsection Title: General

Prior to Change: 7.1.1 If the AC load is identified as “protected”, it shall be fed from a PPSC from an inverter plant or Uninterruptible Power System (UPS), as determined by the AT&T Engineer.

Post Change: 7.1.1 If the AC load is identified as “protected”, it shall be fed from a PPSC from an inverter plant or Uninterruptible Power System (UPS).

Questions relative to this ERCN should be addressed to Serena Kwong at 510-796-1097

Serena Kwong Specialist - Technical Process/Quality [email protected] Access the TP's on the Extranet Site - https://ebiznet.sbc.com/sbcnebs

Concurred Area Mgr Eng Network Quality Implementation Eng & Common Systems Date: 12-11-15 (Mike Cassidy)

Principal – Product Development Engineer (Subject Matter) Date: 11-30-15 (Charles Matlack)

Release Approved Specialist –Technical Process /Quality Date: 01-05-16 (Serena Kwong)