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Equipment Physical Design Standards ATT-TP-76200, Issue 19

AT&T Services, Inc. June 2014

7. DC Power

The following requirements are referenced from, but not limited to, the most recent ATIS-

0600315. Test reports showing conformance to all objectives in GR-1089-CORE Section

10 will be accepted as demonstrating conformance to respective requirements in 7.1

through 7.8 of this Section (ATT-TP-76200 Section 7)

All DC powered Carrier Grade network equipment deployed in Network

Equipment Spaces and Outside Plant/Cell Site shall meet the requirements of this

section.

The requirements in this section are for nominal -48 VDC Network Elements

operating in a steady state voltage range of -40 VDC to 56.7 VDC per Table 1 of

ATIS-0600315.

NOTE: AT&T Services may have other DC Power requirements including but not

limited to those referenced in ATT-TP-76450, Telcordia’s GR-499-Core and GR-513-

Core.

Unless otherwise stated, all requirements shall apply to the dc power input terminals of

the telecommunications load equipment. Although systems vary in architecture, all tests

in this standard shall be performed with the minimum number of power supply modules

installed in the system that can be utilized in practice (except for the noise return tests).

For instance if a system has a redundant power supply module(s), all the redundant

supply modules shall be disabled or removed during the tests in this standard (unless

they physically cannot be removed or disabled when the equipment is deployed). In

addition, for systems with multiple feeds such as “A” and “B”, power is only supplied to

one feed during the tests in this standard.

Steady-State Input DC Voltage Requirements

The telecommunications load equipment shall meet its operational requirements at any

input voltage of the correct polarity between and including the minimum and maximum

values specified in Tables 1 in ATIS-0600315.

Undervoltage Requirements

Equipment shall operate properly when exposed to steady state undervoltage conditions

and shall comply with the conformance criteria as described in ATIS-0600315.The

equipment supplier shall provide a report containing the test methods and results for the

above requirement.

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