AT&T 76450 - Manual (Page 6)

Common Systems Connection Standards AT&T Services, Inc
Date: June 2013
ATT-TP-76450, Issue 15
Copyright © 2013, AT&T . All Rights Reserved.
Page 6
2.2.5 Diverse Cable Routing
Equipment shall be designed to accept diverse power cable routing with inputs on each side of
the equipment.
2.2.6 List Drain Information
Battery return and current path information must be provided in the supplier's response
documentation to be in compliance with this item. List 1, 1X, 2 and 2X drains shall be provided
in the ATT-TP76200 ESP Forms documentation.
Drain Definitions
Defined below are the four drain categories used in this document.
•
List 1 Drain:
This represents the average busy-hour current required at normal operating voltages
at operating conditions as provided by the equipment manufacturer. List 1 current
drains are used to size batteries and rectifiers. The cumulative List 1 current drain is
the current consumed on both the A and B supplies.
•
List 1X Drain
The current that will flow in one side of a dual powered circuit when the other supply
circuit has failed and the power plant feeding the remaining circuit is at the normal
operating voltage (float voltage).
•
List 2 Drain:
Representing the peak current required to operate equipment at –42.64 v DC. This
value is based on manufacturer-supplied data, and calculated to the AT&T minimum
-42.64 v DC engineering design level and equipment configuration.
•
List 2X Drain
The current that will flow in one side of a dual powered circuit if the other supply
circuit is failed and the power plant feeding the remaining circuit is at 42.64 v DC,
engineering design level, or the total power consumption of the network equipment in
watts divided by 42.64v V DC.
2.3 Power Terminations at the Equipment
This section describes the various acceptable DC / AC power connectors and connections that
are approved for use within AT&T. See Table 2-1 for DC classification of acceptable power
connections based on cable termination.
2.3.1 Rear Power Terminations
It is preferred that power terminations be located on the rear of the panel. All power
connections shall be clearly labeled. DC power terminations shall be fully protected with a non-
metallic, non-flammable cover.