AT&T General Practices: 002-290-347

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ATT-002-290-347

BTS Power Abs tract:This docu ment was co nverted " as-is" from Mobility Network Services SharePoint to APEx in 06/2010.Originaldocument f ilename: NG-0012

Audience:State(s): Vendor(s):

Product Name:

Effective Date:

Published : Issue 3, 07/14/10

Expires On: NA

Related Documents:

Canceled Documents:

Business Unit:

Author(s):Jeff Townend ATTUID

AT&T Practice ATT-002-290-347

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AT&T Proprietary (Internal Use Only)Not for use or disclosure outside the AT&T companies, except under written agreement.

2010 AT&T Intellectual Property. All rights reserved.i


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Table Of ContentsINTRODUCTION

Reason For Current Issue

1. Site Prior itization 21.1. Overview 31.2. Tier 1E Sites 31.3. Tier 1 Sites 31.4. Tier 2 Sites 31.5. Tier 3 Sites 3

2. Generators 42.1. Corporate Standard for Stationary Generators 4

2.1.1. Stationary Generator Options 5

2.2. Exceptions for Corporate Standard Stationary Generators 62.2.1. Lower Output 'Smaller' Stationary Generators 62.2.2. Higher Output 'Larger' Stationary Generators 62.2.3. Three Phase Stationary Generators 6

2.3. Corporate Standard for Mobile Generators 62.3.1. Mobile Generator Options 8

2.4. Exceptions to Corporate Standard for Mobile Generators 92.5. Mobile Generator Branding 92.6. Mobile Generator Tracking Systems 10

2.7. Fuel 112.7.1. Diesel 112.7.2. Al ternat ive Fuels: 11

2.8. Maintenance of Generators 112.9. Generator Receptacles 12

2.9.1. Corpor ate Standard Generator Interface Panel 122.9.2. Existing Power Receptacle 122.9.3. Cable Connector Color Coding Standard: 122.9.4. Mobile Generator Control and Alarm Receptacle 132.9.5. Mobile Generator Alarms

132.10. Generator Information Database 142.11. Exercisi ng Generators 14

3. Batteries 14


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3.1. Maintenance of Batteries 143.2. Approved Vendors and Other Information 15

4. Engineering Standards for Tier 1E, Tier 1, Tier 2 and Tier 3 Sites 154.1. Generators 15

4.1.1. Tier 1E and Tier 1 Sites154.1.2. Tier 2 Sites 15

4.1.3. Tier 3 Sites 164.2. PTLC 16

4.2.1. Shelter Standard PTLC 164.2.2. Outdoor Cabinet Standard 16

4.3. Battery 8-4-2 164.3.1. Overview 164.3.2. 8 Hour Reserve 174.3.3. 4 Hour Reserve 174.3.4. 2 Hour Reserve 17

5. DC Plant 175.1. Rectifiers 18

6. Alternate BTS Power Solutions 196.1. Fuel Cells 20

6.1.1. Alarming of Units 217. Approved Vendors for Common Cell Si te Power Services 21

A.1. Document Specific Acronyms 23 A.2. Acronyms Dictionary 23

Revision Log 23 ACRONYMS 23


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Reason For Current Issue

Issue Number Date Description Published By

3 07/14/10 Document cleanup. cj4040

INTRODUCTION

This Guideline provides standards for engineering Generator and Battery installations for Cell Sites. Attachment toPL-0103

Cell Site Power

Network Guideline NG-0012 Rev. 6.0 5/15/08

Overview

This Network Guideline provides the AT&T Mobility Standard for BTS Reserve Power Systems.

Any chan ges to this document must go through the network document update process outlined at Create a NetworkDocument prior to publishing to the Network Document Library.

Document Revision History

This table identifies content revisions made to this document.

Date Rev Revision Description Writer Sponsor

4/4/06 1.0 Version 1 Jeff Townend

7/25/06 1.0 Release Version Jeff Townend Jim Jacot

4/5/07 5 Addition of Portable Gen Naming Jeff Townend Jim Jacot


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2010 AT&T Intellectual Property. All rights reserved.1
http://../Documents%20and%20Settings/Documents%20and%20Settings/AT5406/Local%20Settings/bd1821/Local%20Settings/Temporary%20Internet%20Files/Local%20Settings/Temporary%20Internet%20Files/createpl.aspxhttp://../Documents%20and%20Settings/Documents%20and%20Settings/AT5406/Local%20Settings/bd1821/Local%20Settings/Temporary%20Internet%20Files/Local%20Settings/Temporary%20Internet%20Files/createpl.aspxhttp://../Documents%20and%20Settings/Documents%20and%20Settings/AT5406/Local%20Settings/bd1821/Local%20Settings/Temporary%20Internet%20Files/Local%20Settings/Temporary%20Internet%20Files/createpl.aspx


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Date Rev Revision Description Writer Sponsor

4/15/08 5.1 Annual Update Jacquie Foster Jeff Townend

Contact Information:

For questions or comments about this document's technical content or to request changes to the document, contact:

Jeff Townend

Desk: 404 236 5855

Wireless:

E-mail: [email protected]

Copyright 2007 by AT&T Mobility

All rights reserved. No part of the contents of this document may be reproduced or transmitted in any form without thewritten permission of the publisher.

1. Site Prioritization

This section is intended to provide guidance for how to determine the appropriate priority to assign to a site. It is requiredthat each market uses these guidelines and assigns the appropriate priority to all sites in the market in CTS. This priori-tization is used for a number of different purposes including but not limited to: Disaster Recovery, Planning and Engineer-ing.

In each market it will be the responsibility of the Director of RF Engineering to ensure that all sites are reviewed andassigned a priority ranking based on these guidelines and that the appropriate databases (CTS/CSS) are updated. Allsites in a market shall be reviewe d for the appropriate priority ranking every 12 months. This will account for changes incapacity demand and system maturity and will also insure a site with an initial ranking of 0 (see footnote) or TBD doesnot remain in that un-ranked state.

The first round of site reviews and ranking will be due by June 16, 2008. The next review will be October 31, 2008. October 31 st will become the annual date for market completion of site reviews in each subsequent year. This coincides with oneof the bi-annual Disaster Recovery Plan updates required by PL-0034.


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1.1. Overview

A priority site will be generally defined as one that houses Network Elements, provides service to critical governmentoffices, or coverage to evacuation routes, and other emergency type of services or Major Market Accounts.

1.2. Tier 1E Sites

Tier 1E will designate the highest priority and will be assigned to sites that house Network Elements such as MSC's,BSC's or microwave hubs. Also sites providing coverage to critical state government offices along with state police andcounty EOC's. These highest priority sites should be comprised of no more than 20% of a market's total sites and will

include market designated 'Executive Sites*'. 1

1.3. Tier 1 Sites

Tier 1 sites will make up the next 25% of Priority sites and will be those that provide coverage along state designatedevacuation routes, hospitals, airports, power plants, and local police and fire services. Sites in this category would also

be those that provide coverage to densely populated areas or serve as high traffic/capacity sites. 1

1.4. Tier 2 Sites

Tier 2 priority sites are those that provide service to medium density population areas and medium traffic volumes or support Major Market Accounts. It will be the responsibility of the markets to determine where these Major Account sites

exist. This level of priority would be assigned to 20% of a market. 2

For sites that support major accounts, the Engineering group in conjunction with Operations and Sales Management willneed to establish a ranking of the top sites that support these customers/accounts. This list can be obtained from Salesbased on monthly revenue from these accounts. The sites must be ranked based on their % of carried traffic against totalsystem traffic = [ISBH (individual sector Busy Hour) traffic]/ [divided by total system traffic] * 100 and sorted from high tolow. Sites or sectors carrying the highest traffic will appear on top of the list. The sites with the highest ranking that fallinto the account coverage area should be given priority status for generator additions. All new sites going forward mustbe tracked and identified in this manner to ensure that generators are added as time permits.

1.5. Tier 3 Sites

Tier 3 sites make up all other sites that do not meet the aforementioned criteria for prioritization. (Generally the remaining

35% of a market's sites) 3

* Executive sites are those sites designated by individual markets and provide coverage not just to AT&T executives butalso those of other major corporations that may need to be contacted during emergency situations.


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1. = In CTS the Tier 1E sites would equate to High or High-Facility Hub. Tier 1 sites will equate to High-Red Cell.

In CSS program this would be the equivalent ranking of 1 (highest) for Disaster or Recovery Priority fields.

2. = In CTS this would equate to Medium.

In CSS program this would be the equivalent ranking of 2 (medium) for Disaster Recovery Priority fields.

3. = In CTS this would equate to Low.

In CSS program this would be the equivalent ranking of 3 (low) for Disaster or Recovery Priority fields.

Sites of TBD in CTS or 0 priority in CSS would be new sites that have not had sufficient coverage or traffic studiesperformed to determine the appropriate ranking.

2. Generators

The ATT Mobility Standard is to employ conventional internal combustion engine generators as the primary means of providing 'backup' power. This document does provide 'rules of engagement' if the reader is considering alternative meansof power generation (fuel cells, etc).

2.1. Corporate Standard for Stationary Generators

The standard for stationary units is a 50kw emergency standby rated (at 240V Single Phase 60 Hz) diesel generator.Generator requirements are based on the capacity of AC service drops provided at sites. The majority of ATT Mobilitysites use 200A AC service drops. 50KW emergency standby rated generators will adequately handle surge and peakload requirements at such sites. Capacity requirements alone do not address numerous and important variables associ-ated with generator configurations. The following standards, features and functions should be included for all stationarygenerator configurations:

UL2200

NFPA70, NFPA110 Compliance

EPA Compliance for Diesel Engines

Permanent Magnet Excitation

Electronic Governor

Maximum Average Noise Level: 71dBA at 7 Meters


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Output Breaker Protection

Controller Under/Over Frequency & Under/Over Speed Protection

50C Ambient Temperature Cooling System

Emergency Shutdown Button

UL142 Double Wall Diesel Sub Base Fuel Tanks with Fill Limits and Spill Containment System

50 hour minimum runtime at 75% load

Minimum 2 gallon Overflow Containment with Containment Tank Alarm

Low Fuel Alarm

Stationary generator installations at priority sites may include at the market's discretion, a manual disconnect/transfer

(Intersect optional 3 rd source ATS) and Cam-Lock generator connections to allow mobile generator operation in case of stationary generator failure.

2.1.1. Stationary Generator Options

A number of stationary generator options may be considered based upon operational requirements or specific local codes,ordinances or laws.

Examples of such options include:

Reduced Noise Enclosure Aluminum Weatherproof Enclosure (Coastal or Corrosive Environments)

Remote Annunciator Panel

Automatic Transfer Switch

ATTM Standard is 300 Series ASCO (integrated into Intersect PTLC)

Stand-alone ATS (PTLC acceptable if required)

Other ATS models allowed if requirements & specifications met

TVSS Option Required

Exerciser Option Required


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IP Addressable option must be available although not required (future direction)

Alternative Fuel (LPG or Natural Gas - See section 3.4)

3-Phase alternator for 3-phase AC service sites

2.2. Exceptions for Corporate Standard Stationary Generators

2.2.1. Lower Output 'Smaller' Stationary Generators

Markets may elect to place a smaller generator (less than 50kw) at the site providing the unit is adequately sized to servethe existing needs of the site and the projected growth requirements of the site.

2.2.2. Higher Output 'Larger' Stationary Generators

Multiple site technologies, RF amplifier (SCPA/MCPA) deployments, growth and network integration activities have allcontributed to increased power requirements at sites. A number of sites throughout ATT Mobility have been required toupgrade AC service capacity to 400A or, in some cases add a second 200A AC service drop. Larger capacity generatorsare required to support sites with 400A AC service or multiple 200A AC service drops. The standard 50kw generator doesnot have the capacity to meet load requirements at such high capacity sites.

Markets are authorized to deploy stationary generators that exceed 50kw only in those installations whose current power requirements have exceeded 50kw (AC service capacity greater than 200 amps). All sites that exceed a power require-ment of 50kw normally qualify as 'Tier 1E, 1 or 2 priority Sites' using the aforementioned criteria and should therefore beequipped with permanent stationary generators.

2.2.3. Three Phase Stationary Generators

Some areas have 3-phase utility power. Markets can deviate from the generator standard as needed to properly engineer for these 3-phase Markets/areas. Markets are encouraged to purchase mobile generators that are both Single and Three-phase selectable if there are occurrences of 3-phase power in the Market. The 50kw (or optional 90-100kw if required)standby emergency rating must be the generator capacity at 240V single phase. (Three phase alternator capacity isusually de-rated for single phase service.)

2.3. Corporate Standard for Mobile Generators


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Appleton AP20044 Adapter

Bare-end Adapter (for lugged power connections)

Optional Custom Adapters per market requirements

60' Auto-Start/Stop & Alarm Cable (1-pair control; 5-pair for alarms using Deutsch DTM-12 waterproof connectors)

Tandem Axle Trailer

ICC/DOT Trailer Package (Lights/Markers/Safety etc.)

Electric Brakes

Adaptable/Removable Hitch System

2-5/16 Ball Hitch

Pintle Hitch

Tongue/Front Leveling Jack Stand w/Sand Shoe

Rear Leveling Jack Stands

(NOTE: Details on mobile generator alarm & control cable are provided in section 3.6.2 of this document.)

2.3.1. Mobile Generator Options

A number of mobile generator options may be considered based upon operational reliability, safety and compliance withlocal codes, ordinances or laws. Examples of options include:

Custom adapter power connectors as required

Solar Battery Trickle Charger (improved starting reliability)

Trailer Security Boot (Sabodoin Boot with UN967 Key)

Trailer Spare Tire

Wheel chocks

3-phase selectable alternator


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Automatic Transfer Switch

ATTM Standard is 300 Series ASCO (integrated into Intersect PTLC)

2.4. Exceptions to Corporate Standard for Mobile GeneratorsMarkets may purchase mobile generators (of a size greater than 50kw) to provide redundancy to sites with needs thatexceed 50kw. These type mobile units should only represent a small percentage of any Market's mobile generator fleet.To adequately handle surge and peak load requirements at sites with 400A AC service, a 90-100kw generator is required.For maximum deployment flexibility, high capacity mobile generators (90-100kw) should be equipped with power cableadapters to meet connection requirements at all market sites (including lower capacity sites). Markets having sites withtwo 200A AC service feeds must include cam-type 'T' adapters with 90-100kw mobile units to allow paralleling dual 200Apower connector adapters at such sites.

2.5. Mobile Generator BrandingEach Mobile/Portable generator shall be 'branded' in the following manner:

AT&T Logo

AT&T Mobility Name

Unit number (see chart below for standard label.)

Unit number should be a minimum of 4 inch letters/numbers to allow visibility and should be of a color that contraststhe color of the generator.

ED Market Region Market ID Standard Numbering Scheme

New England NE NE NE-NE-0001

Upstate New York NE UNY NE-UNY-0001

New York City NE NYC NE-NYC-0001

DC - MD NE MD NE-MD-0001

East Penn-South NJ -DE NE PAE NE-PAE-0001

VA-WV NE VA NE-VA-0001


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ED Market Region Market ID Standard Numbering Scheme

South TX CE STX CE-STX-0001

North TX CE NTX CE-NTX-0001

AR-OK CE AOK CE-AOK-0001

MO-KS CE MOK CE-MOK-0001

WI-IL CE WIL CE-WIL-0001

MI-IN CE INM CE-INM-0001

West Penn - OH CE PAW CE-PAW-0001

ND-SD-NE-MN-IA CE MNP CE-MNP-0001

Los Angeles WE LAX WE-LAX-0001

SanDiego - Las Vegas WE SDL WE-SDL-0001

North CA - Reno WE NCA WE-NCA-0001

WA-OR-ID WE PNW WE-PNW-0001

AZ-NM WE DSW WE-DSW-0001

HI ** WE** HI** WE-HI-0001**

CO-UT-WY-MT-S. ID WE MTN WE-MTN-0001

TN-KY SE TNK SE-TNK-0001

AL-MS SE AL SE-AL-0001

NC-SC SE CAR SE-CAR-0001

GA SE GA SE-GA-0001

North FL SE NFL SE-NFL-0001

South FL SE SFL SE-SFL-0001

Puerto Rico ** SE** PR** SE-PR-0001**

**Puerto Rico and Hawaii are not expected to ship mutual aid generators. To assist in generator identification and recovery, thesemarkets are expected to follow the generator labeling standard above.

2.6. Mobile Generator Tracking Systems


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At present, there is no portable generator tracking system supported by AT&T Mobility. Markets are discouraged fromselecting or deploying such a system (GPS or GPRS Tracking of mobile assets) until such time as an appropriate solutionis selected by corporate.

2.7. Fuel

2.7.1. Diesel

Diesel is the corporate standard for generator fuel. Stationary generators are to be equipped with a fuel tank with minimumcapacity of 200 gallons where possible (or a minimum 48 hour runtime at 90% load). This will help ensure an adequatelocal supply of fuel to support fuel re-supply operations during a crisis event. 50kw mobile generators shall be equippedwith on-board fuel supply to provide a minimum of 48 hours runtime at 90% load. Large capacity 90-100kw mobile gener-ators shall be equipped with on-board fuel supply to provide a minimum of 24 hours runtime at 90% load.

2.7.2. Alternative Fuels:

The use of alternative fuel types (natural gas, propane, etc) is generally discouraged. During a regional disaster event,these types of fuel are often unavailable and nearly impossible to ship into an affected area in bulk. Additionally, when apropane or similar tank is used, it is difficult to accurately determine fuel level. However, many markets have benefitedfrom the use of these fuels. This section is intended to provide rules of engagement for the use of fuel types other thandiesel.

1. Any site at which fuel other than diesel is used must be equipped with an automatic transfer switch with optional

portable generator connection (3 rd source switch. See ATS section of this document). This will allow a portablegenerator to be easily connected to the site during a disaster event if needed.

2. In some areas, it may be possible to connect the generator directly to the local natural gas grid (direct pipe to utilitygas meter). This method is highly encouraged except in areas susceptible to seismic activity. Where risk of seismicactivity is greatest (generally known as 'Zone 3 or Zone 4' areas), this method is prohibited.

3. LPG/CNG Tank - If LPG/CNG tank is used, the tank must be sized to allow for the generator to power the site for aminimum of 5 days.

4. All Mobile/Portable generators continue to be diesel fuel only.

2.8. Maintenance of Generators


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If a generator is placed at any site, the generator is to be serviced in accordance with manufacturer's recommendations.It is the responsibility of the market to maintain records reflecting the preventative maintenance activities of Generators.Please refer to the BTS Operations and Maintenance Guidelines for preventative maintenance activities.

2.9. Generator Receptacles

2.9.1. Corporate Standard Generator Interface Panel

HQ Operations currently maintains a resource library of all approved generator interface panels at the following link:Corporate Standard Generator Receptacle and Product Specs

Markets are to retrofit all sites (where possible) with the corporate standard generator interface panel. Market shouldcomplete retrofits in order of site priority.

All new cabinets and shelters will be equipped (from the vendor) with the corporate standard interface panel. Markets willno longer be permitted to purchase any other generator con nector/interface options.

All portable generators within AT&T Mobility either are equipped with or will be evolved to the cam-lock connector stand-ard.

2.9.2. Existing Power Receptacle

A wide variety of generator power receptacles/connectors are currently in use in the network. The Markets are encouragedto maintain a supply of interconnect cables (generator pig-tail) to adapt from their mobile generator fleet to each type of

legacy receptacle employed in the Market. Adapter pigtails should be 10' in length with color-coded Cam-Type connectorsfor attachment to the mobile generator power cabling.

The following kits/parts are available from CommTech to assist in the fabrication of these umbilical cable/'Pigtail' connec-tors.

Umbilical-Connector Cable "pigtail" fabrication kits

2.9.3. Cable Connector Color Coding Standard:


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2.9.4. Mobile Generator Control and Alarm Receptacle

The generator control leads provide engine control functionality only with sites that have an automatic transfer switch(which has been standard in ATT Mobility shelter configurations for a number of years). The connections provide rapidalarm connectivity even at sites with manual transfer switches, although automatic engine control is not available withmanual transfer systems. It is recommended to upgrade sites with a manual (or no) generator transfer switch to ATS aspossible when doing generator connector upgrades.

New shelter standards will provide for direct Cam-Type generator connections and will include a pre-wired generator alarm/control receptacle. Upgrades to add the alarm/control receptacle will be available for existing shelters & sites.Outdoor cabinet PTLCs are to include Cam-Type connectors and the generator alarm & control receptacle.

The bene fits of this system allow a portable generato r to be deployed to a site on a semi-permanent basis with all thefunctionality of a traditional fixed generator system. Additional benefit is that mobile generators can be pre-deployed andconnected to sites in advance of pending threat/disaster event. This greatly reduces post-disaster recovery times.

Specifications:

Detailed information for the standard alarm and control cable can be found at the following:

Mobile Generator Alarm and Control Cable

2.9.5. Mobile Generator Alarms

Standard mobile generator alarms are:

GENERATOR MAJOR: A generator failure resulting in generator shutdown. (Contact closure for alarm condition.)

GENERATOR MINOR: A generator problem not resulting in a shutdown. (An example would be the fuel spill containment

alarm indicating a fuel over-fill or leak. Contact closure for alarm condition.)

GENERATOR RUN: Indication that generator is running. (Contact closure indicates generator operating.)

GENERATOR LOW FUEL: Indication that the generator fuel supply is low. (Contact closure for alarm condition.)


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GENERATOR MISSING: Indication that the generator is not connected - possible theft. (Normally closed contact opensfor an alarm condition.) The mobile generator provides a closed or shorted condition on this alarm pair. Removal of thealarm control cable or cutting of the cable would result in 'open' alarm condition.

It is preferred to provide a 'closed' contact for non-alarm conditions because it provides automatic continuity verificationfor alarm wiring under normal conditions. Here, only the GENERATOR MISSING alarm is normally closed, and it therefore

also functions as an indication that connector continuity may have been disrupted for some reason other than theft.

For any site equipped with a stationary generator or an alarm/control connector for mobile generators, the generator alarms are to be tested and verified with the MNOC to assure they are visible at the MNOC.

2.10. Generator Information Database

Information for all stationary generators shall be properly entered and maintained in CSS 'Site Information'. Informationfor all mobile units are to be maintained in the 'Network Resources' database that is included as part of the bi-annualDisaster Recovery Plan update.

2.11. Exercising Generators

Due to environmental regulations, all cell site stationary generators will be cycled bi-weekly for no more than 30 minutes(20 minutes under load with 10 minute for cool-down cycle). Testing under load is necessary to ensure the unit isfunctioning properly and to prevent 'wet stacking'. Appropriate logs will be maintained by the Market to document theoccurrence of generator exercise events. If Market is unable due to environmental regulation to meet this requirement,Market is to contact HQ Operations Support for a variance.

Markets are encouraged to have mobile units exercised regularly as part of their preventative maintenance to assurethe units are operational when needed.

3. Batteries

Valve regulated batteries are the AT&T Mobility Standard and are to be used for all replacements, upgrades, additions,and new site construction. This document does provide 'rules of engagement' if the reader is considering alternativemeans of power generation (fuel cells, etc).

3.1. Maintenance of Batteries

If batteries are placed at any site, the batteries are to be serviced in accordance with manufacturer's recommendations.It is the responsibility of the market to maintain records reflecting the preventative maintenance activities of batteries.


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At Tier 2 sites a permanent generator installation is preferred but not mandated. However these sites will be required tohave an ATS installed and have sufficient ground space reserved in the cell site compound to allow for the deploymentof a mobile/temporary generator of the type and capacity specified earlier.

4.1.3. Tier 3 Sites

A stationary generator is not required by this policy to be placed at a Tier 3 site. It is the discretion of the Market to deploystationary generators to Tier 3 sites. If no stationary generator is on site, the site must have 4 hours of battery backup.

4.2. PTLC

The corporate standard PTLC (Power Transfer Load Center) shall be used for all new shelter and cabinet installations. Additionally, any replacements or upgrades to existing site power systems must include retrofit of the site (if not alreadyequipped) with the corporate standard PTLC. The use of MTS (Manual Transfer Switch) equipment is no longer permittedin AT&T Mobility.

4.2.1. Shelter Standard PTLC

(Please n ote that the standard includes 3Rd source option to allow for the connection of a portable generator if needed)

Intersect - SeriesAA-3S

4.2.2. Outdoor Cabinet Standard

(Please note that the standard includes 3 Rd source option to allow for the connection of a portable generator if needed)

Intersect - Series AA-CL-T-3S

4.3. Battery 8-4-2

4.3.1. Overview

The following section provides the standard for engineering of cell site battery reserve capacity. 8-4-2 refers to the number of hours of reserve time provided by the battery plant.


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4.3.2. 8 Hour Reserve

Tier 1E, or Tier 1 Sites that are not equipped with a Stationary or Semi-Permanent Generator shall have minimum 8Hours of battery reserve.

NOTE:Engineering a site with an 8 hour plant should be considered by the market to be an absolute last resort and onlyused when all o ther option s to place a generator have failed.

New sites - If a new site is determined to be a Tier 1E, 1 or Tier 2 priority site based on the aforementioned criteria, andcannot be equipped with an emergency generator, then it is to be engineered with 8 hours of battery reserve.

Existing Sites - Market personnel will determine the existing battery backup capacity for these Tier 1E or Tier 1 prioritysites. If the capacity is less than four (4) hours, it will be necessary to replace/expand the plant to satisfy an eight (8) hour minimum for standby power.

Exempt Sites - If it is not possible to place either a stationary generator or a battery plant capable of providing 8 hour minimum reserve at a priority site, the market is directed to provide the maximum reasonable amount of valve regulatedbattery backup that can be placed at the site. Market must maintain a list/inventory of all sites of these sites that cannotbe brought to standard. Examples of such installations can include: Rooftop sites (where roof structure cannot handleadditional weight of 8 hr plant), Lease/space restrictions (we are limited by lease agreement to space that will not accom-modate 8 hr plant), Environmental regulation (example: National Park Land, environmentally protected area), Tribal Law(site placed on reservation where placement of reserve power system is prohibited by tribal law of reservation). Marketlist/inventory of sites must include detail (site by site) of specifically why each individual site cannot be brought to standard.


All Tier 2 and Tier 3 sites that are not equipped with a stationary or semi-permanent generator shall have a minimumof 4 hours of battery reserve


Any site at which a stationary or semi-permanent generator is placed shall have a minimum of 2 hours of battery reserve.

5. DC Plant

The DC Plant is the point at which commercial AC power is conditioned to DC and has the largest impact to AC load.Therefore, it is important to establish correct DC plant configuration for both existing and site peak DC load. If any additionalDC load is required for site growth projects (e.g. cabinet expansions) obtain values from vendor manufacturer for ACpowered equipment (e.g. rectifier, HVAC units, heaters, dehydrators, tower lighting systems etc). DC Plants and batteries


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should be correctly calculated for the anticipated load requirement to establish correct configurations for both peak andprojected site growth.

The DC plant controller options must be configured to allow full battery recharge within 18 hours. Additionally, the'Float Voltage' setting must be configured within the battery manufacturers recommendations. Failure to set the appro-priate float voltage may damage or greatly reduce the life of the batteries.

DC Power Plant overall calculation can be determined by using the AC-DC- BTU Power calculator. A copy is providedbelow.

DC-AC-BTU Calculator Tool

The Power Calculator tool was designed for very rapid and simple site power design/assessment. The tool will automat-ically calculate: Total # rectifiers; Total # Converters and Battery requirements for 4 hour reserve. The tool automaticallyconfigures the DC plant requirements to meet AT&T Mobility guidelines for minimum 15% growth capacity, 18 hour batteryrecharge, and it also provides additional detailed characteristics on the configured system.

For cell site AC load calculations, DC plant rectifiers, indoor lighting, HVAC unit and the shelter power-fail relay (if equip-ped) should normally be calculated and designated as continuous loads for optimum site reliability.

The wide variety of site configurations e.g. cabinet, shelter and siteequipage e.g. # of radios equipped, MCPAs, etc. makeit morecost effective to equip the DC plant at time of order with the appropriate number of rectifier modules, DC converters,and to go through the initial start-up testing before connecting all additional power cabling.

Approved vendors, models and pricing for DC plant equipment are provided at the following:

DC Plant RFP Award Announcement

Approved DC Plant Vendors, Models and Pricing

5.1. Rectifiers

A DC power plant system has the operation of its individual rectifiers controlled by a stored program control system for the purpose of optimizing power efficiency. Load power requirements are compared with rated capacities of operatingrectifiers of the system and individual rectifiers are turned on or off so that the plant efficiency is always maximized.Rectifiers are selected for turn on and off in the basis of their rated power capacity and their accumulated operating times.

Rectifiers powered by commercial AC power change that power (usually 208, 240 or 480 V AC) to a nominal +24, -48,Volts DC. The rectifiers float the Cell Site batteries and provide recharge after a commercial power outage.

At the Cell Site the equipment typically operates at either +24 or -48 VDC. In the calculation of the DC plant load obtainthe maximum AC load per individual rectifier from the manufacturer/vendor. It is highly recommended to obtain exactmanufacturer specifications. Here are examples of typical AC loads for various size +24VDC rectifiers:


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70A -13A @ 240VAC = 3120VA100A -14A @ 240VAC = 3360VA125A -16A @ 240VAC = 3840VA130A -17.2A @ 240VAC= 4130VA150A -19.8A @ 240VAC = 4752VA

Rectifiers are standardized by using the approved vendor/models indicated above.

In the calculation process for DC Plant design, HVAC and Heating Units must be considered for AC Loads. The previous

work sheet requires input on type and quantity of site HVAC units. Site air conditioning units and heaters have a largeimpact to AC load calculations. Exact manufacturer specifications should always be used if possible. Some sites haveheating equipment in addition to HVAC units: 'Where it is unlikely that two or more non-coincident loads will be in usesimultaneously, it shall be permissible to use only the largest load(s) that will be used at one time for calculating the totalload of a feeder or service. -NEC 220.60:' Therefore, it is permissible to use the largest load(s) of either the heater(s) or HVAC unit(s) for the load calculations. Here are typical AC loads for various size HVAC units:

6 TON HVAC = 50A @ 240V = 12 KVA5 TON HVAC = 44A @ 240V = 10.56 KVA4 TON HVAC = 35A @ 240V = 8400VA3 TON HVAC = 28A @ 240V = 6720VA2 TON HVAC = 24A @ 240V = 5760VA

NOTE:Due to the UMTS network growth two 4-ton HVAC units may be necessary due to the increased site heat loadswith integration and growth projects.

6. Alternate BTS Power Solutions

This section establishes the requirements that must be met for consideration of alternative BTS Power solutions (bothreserve and prime power applications). For installations meeting these criteria, alternate technologies may be consideredas an augmentation and, in some cases, a replacement of traditional power technologies such as battery and dieselgenerators.

Candidate sites for these 'alternative' solutions are sites identified as critical by the market Network RF Engineering or Operations groups where it may be necessary to extend standby reserve beyond the prescribed AT&T Mobility standard.

Alternate power solutions should also be considered for BTS sites where the standard AT&T Mobility battery reservecannot be supported due to extenuating circumstances such as EPA or zoning constraints. Alternate BTS power technol-ogies may be considered if they are the most cost effective or only available solutions to support network reliability andsurvivability by means of providing extended BTS Power for mission critical installations.

Some alternative power solutions may have incentives such as tax credits and regulatory exemptions such as non-pollut-

ing characteristics of technology which offers AT&T Mobility the ability to extend the reserve time while avoiding many of the EPA and zoning requirements placed on traditional lead acid and combustion systems.

The goal of this section is to introduce the use of alternate power solutions to AT&T Mobility to improve network reliabilitywhile minimizing the risk of noncompliance to governmental and internal AT&T Mobility regulatory standards. Network


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reliability, customer perception and the run time on the AT&T Mobility network will be improved by providing extendedreserve for mission critical installations.

6.1. Fuel Cells

The solution has been reviewed by ATT Mobility's EH&S group and has been approved for limited field trial. Markets areto report any sites equipped with fuel cell on a quarterly basis to HQ Network Operations Support.

Currently, HQ Network Operations Support is proceeding with Supply Chain Management to perform an RFP on fuelcells.

Candidate Sites for Fuel Cells

At present, fuel cell solutions are far more expensive than conventional generator and battery backup systems.

A site qualified to be a candidate for a fuel cell system would be at a location where conventional reserve power solutionswould be prohibited due to environmental or other regulatory or zoning restrictions. For example, some locations withinthe National Park System may prohibit lead acid.

Sites considered critical to sustaining the network in extended outage conditions may be considered as candidate instal-lations for extended runtime DC systems (i.e. fuel cells). For example certain mountain-top or other sites with extremelydifficult (or seasonal) access may be considered.

The power requirements of the site must be with in the limits of the fuel cell technology, with consideration given to thenumber of cylinders of hydrogen that must be connected for a given runtime of not less than 24 hours between replace-ments of cylinders. As mentioned previously, Network Operations has been tasked with identifying and prioritizing criticalinstallations within the network. The selection of these sites is determined through National Policy as well as coordinationof Market and Regional Network Operations and BTS Network Engineering. Environmental, Health and Safety will beinformed and consulted as needed to assess any potential regulatory impacts associated with new technologies.

The Market Champion will be responsible for the generation of the business case and network impact documentation andobtaining the market engineering and operations plan acceptance. It will be necessary for the market deployment manager to ensure that Local Zoning laws and Federal and State Regulations are met before further consideration of an alternateBTS power solution.

The attached exception form is to be completed and routed to the following for approval:

Market Executive Director


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Regional Vice President

HQ Network Operations - Please submit the finalized form to the following internal e-mail address: NetworkEngineering and Ops Support

Fuel Cell Exception Request

Fuel Cell Exception Request.xlsYou may download this file from the online version of this document.

Note: You must have the proper application in order to open the file.

HQ Network Operations will forward notification to AT&T Mobility EH&S so that these installations are properly reported.

6.1.1. Alarming of Units

Each site equipped with a fuel cell is required to have the following standard alarms:

Commercial Power Failure

Fuel Cell Running

Fuel Cell Critical

Fuel Cell Major

Fuel Cell Minor

Low Fuel

As any site is equipped with a fuel cell, the alarms are to be tested and verified with the MNOC to assure they are visibleat the MNOC.

7. Approved Vendors for Common Cell Site Power Services

SCM performed an RFP (often called the Power 8-4-2 RFP) to select approved vendors to perform the following commonpower related activities:


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Add GNB 12-XL2000 Battery string

Add additional GNB 12-XL2000 Battery string

Add GNB 12-100A31 Battery string

Add additional GNB 12-100A31 Battery string

Add GNB 12-100A21 Battery string

Add additional GNB 12-100A21 Battery string

Add GNB M12V155FT Battery string

Add additional GNB M12V155FT Battery string

Replace defective battery cell

Defective battery documentation and logistics

Add Battery Buss bar

50KW Generator Installation

Add 4KW Fuel Cell

Add 6KW Fuel Cell

Add 8KW Fuel Cell

Add 10KW Fuel Cell

Add 12KW Fuel Cell

Install/Retrofit Mobile Generator Connection

Add/Replace transfer switch

Reconfigure DC Power

Modify Rectifier Configuration

Setup DC Plant Parameters and temperature probes

Install DC Fans

Install Battery Cabinet

Site Survey


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The SOW (Statement of Work) used by SCM for the RFP is available at the following:

Power 8-4-2 SOW

Revision Log

Issue Number Date Description Published By

3 07/14/10 Document cleanup. cj4040

2 06/25/10 Corrected embedded

document (in the converteddocument It was displayed asa graphic.)

cj4040

Acronyms

A.1. Document Specific Acronyms

A.2. Acronyms Dictionary

Refer to ATT-000-000-020, Acronyms Dictionary.


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