AT&T 76450 - Manual (Page 11)

Common Systems Connection Standards AT&T Services, Inc
Date: June 2013
ATT-TP-76450, Issue 15
Copyright © 2013, AT&T . All Rights Reserved.
Page 11
2.6.6 All fuses and circuit breakers shall meet Quality Level III as defined by Telcordia
SR-332.
2.7 Filtered Battery
All equipment requiring “Filtered Battery” shall provide the filtering within the equipment.
(Filtered DC power PDUs are not provided by AT&T to remove excessive levels of transient
noise generated within the equipment).
2.8 Special PDU
Even though not recommended as a choice by AT&T, some equipment designed by various
manufacturers require specific PDUs that are considered part of the system or equipment
being evaluated which may include unique characteristics needed to serve their specific
network device. These “special PDUs” must meet all the same design criteria identified in this
document as well as the ATT-TP-76200 NEBS publication. If accepted, this “special PDU”
would be listed as part of the equipment approval, purely as an integral part of the package
and its approval is exclusive to the associated equipment. Furthermore, this “special PDU”
should be reviewed by the Common Systems Technical Staff to insure its integrity.
2.9 Integrated Power Distribution
Defined as; power distribution that is integrated within the framework of the network element
(e.g. #5 ESS PDF frame). Generally speaking, equipment requiring more that 200 amps of DC
power needs this type of power distribution. The equipment is commonly found in large multiple
interrelated-bays.
These type devices are considered equipment specific and should meet the requirements as
listed in Section 1 of this document as well as the ATT-TP-76200 NEBS publication.
Additionally, AT&T requires the use of fuses in lieu of breakers in these applications.
2.10 Visual Power Alarms and Status Indicator
The equipment shall provide visual power alarm and status indications by indicator devices
mounted directly on the equipment and preferably at the top of the equipment bay. The
equipment shall also be capable of transmitting alarm signals to an office alarm circuit and to
sending circuits for remote surveillance using dry loop relay contacts or other means. Power
alarm and status reporting information must be provided in the supplier's response
documentation to be in compliance with this item.
If an alarm indicator pilot fuse is present in the power circuit, it should operate when the power
fuse fails.