To: All At&T Installation Suppliers s3

AT&T ENGINEERING REQUIREMENT CHANGE NOTIFICATION - ATT-TP-76400-180 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: UPS Powering Action: Add: Modification: Delete:

Section: 12 Section Title: Power Systems Subsection: 7 Section Title: Inverters (DC/AC) and Uninterruptable Power Systems (UPS) Subsection: 7.3 Subsection Title: UPS

Prior to Change: 7.3.4 UPS “A” and UPS “B” shall have its own battery back-up. Battery reserve time shall be engineered to 30 minutes based on full load.

Post Change: 7.3.4 UPS systems shall have their own dedicated (not shared) battery back-up.

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: 12-21-15 (Mike Cassidy)

Principal – Product Development Engineer (Subject Matter) Date: 12-14-15 (Charles Matlack)

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