AT&T 76450 User Manual

Common Systems Connection Standards AT&T Services, Inc Date: June/2013 ATT-TP-76450, Issue 15

ATT-TP-76450

Common Systems Equipment Interconnection

Standards for AT&T Network Equipment Spaces

Abstract

Presented in this document are the Common Systems Equipment Interconnection Standards for equipment placement and interconnection in the ATT Network Equipment Spaces. Users of this document should note that requirements and information contained within may only be excerpts of full requirements necessary for an acceptable installation of network equipment in a ATT facility. Users must refer to reference document for detailed requirements.

Target Audience: The primary audience for this document is telecommunications equipment

manufacturers. This document will also be used in the PDF process associated with Requests for Information (RFI), Requests for Price (RFP) and Requests for Quote (RFQ) for equipment placed into the ATT Local Exchange Companies and AT&T Corporation networks.

Effective Date: June 2013 Issue Date: Expires On: N/A Related Documents: See Reference Section of this document. Canceled/Superseded Doc: N/A Issuing Dept: ATT Services, Inc., Network Planning & Engineering (Common Systems &

Transport)

Documents Coordinator: John Tablerion – (708) 403-4450, E-Mail: jt3216@att.com Author: Bon Pipkin – (925) 823-4325, E-Mail: bp2318@att.com

Common Systems Connection Standards AT&T Services, Inc Date: June 2013 ATT-TP-76450, Issue 15

GENERAL

1.1

Requirements

This document provides the requirements for interconnection of new equipment in the AT&T Network Equipment Spaces. The appendices include the ATT equipment evaluation process to be used to verify compliance to these requirements.

1.2

Purpose

AT&T’s networks are designed around fundamental standards for the purposes of meeting interconnection, safety, and industry standards. New equipment is required to integrate into the network seamlessly (fit, form and finish), without the impact or cost pressure to compensate for the product introduction.

The purpose of this section is to provide equipment suppliers with an overview of the AT&T network interconnection requirements most commonly encountered as non-compliant with new equipment and a process for relaying information about compliance to these requirements. This document is not intended to be a comprehensive list of all AT&T interconnection requirements. A product's compliance with the requirements and objectives of this section will not be the sole basis for the acceptance of the product, however noncompliance with one or more of the requirements or objectives of this section may be the basis for a product's denial of purchase.

1.3

Scope

Unless otherwise stated, the requirements contained herein apply to equipment systems and assemblies intended for installation in network equipment buildings, equipment areas within buildings, electronic equipment enclosures such as controlled environmental vaults, outside electronic equipment cabinets, and customer locations.

1.4

Pre-assembled versus Field Assembled Network Equipment

Network Equipment layouts provided as overall solutions need to be reviewed in one of two ways regarding the applicability of Common Systems components and products. For the purposes of this document, AT&T Network Carriers are only concerned with the connectivity and interconnection issues between the OEM equipment and the AT&T network facilities. OEM design practices internal to the Network Equipment hardware are not reviewed under this documentation.

OEM connectors and external contact points will meet the requirements contained in this document for performance, reliability and suitability. The use of a “Plug & Play” system using internal self contained Network Elements must also meet AT&T standards contained in TP

76200.

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Common Systems Connection Standards AT&T Services, Inc Date: June 2013 ATT-TP-76450, Issue 15

If the product uses various components that are interconnected together, this document will be applicable for interconnection between the various external components and cabling in addition to stand-alone Common Systems components that may have been standardized with other products within the ATT Network Carrier companies. If the OEM has presented a solution that uses “off the shelf” separate components that are externally cabled within the bay or relay rack, validation and use of the AT&T standard product lines shall be given.

Example: All DSX-1, DSX-3 and FDF panels will be provided by ADC Telecommunications Inc. for the AT&T Network.

Finally, determinations will need to be made with AT&T Network Carrier company’s technical staff as to whether the items provided within the product meet either pre-assembled requirements or will be field assembled. Pre-assembled products will be considered within any Network Equipment/Element hardware box or panel that includes intelligent hardware or software. The assembly of multiple pre-assembled Network Equipment/Element products within the same footprint will be negotiated with the AT&T Network Carrier companies. The assembly of multiple pre-assembled Network Equipment/Element products outside of the same footprint will be handled as a field assembled installation. Any Network Equipment/Element that uses a passive product panel or box that does not include intelligent hardware or software will meet AT&T Network Carrier product approval standards and will be field assembled.

All assemblies, including internal wiring between components shall meet workmanship standards that include a neat and well-secured assembly with no sharp edges or cable/wire ends exposed.

1.5

ATT-TP-76450 Internet Web Site

Copies of this document and general information about AT&T’s environmental equipment standards may be found at https://ebiznet.att.com/sbcnebs/.

1.6

Product Evaluation Process

ATT-TP 76450 Product Evaluation Process is documented in Appendix A of this document. Equipment manufacturers should follow this process for each new Network Element under review by AT&T Network Carriers.

1.7

Additional AT&T Requirements

The following is for notification purposes only. Refer to the directions given to obtain further information on these subjects. Verification of conformance to these standards is not part of the evaluation process for this section.

• ATT-TP-76200, Network Equipment Power, Grounding, Environmental, and Physical Design Requirements

• ATT-TP 76300, AT&T Installation Requirements

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• ATT-TP 76400, AT&T Design Engineering Requirements

1.8

Adherence to AT&T Standard Suppliers

Within the Common Systems Checklist, standard corporate providers of the product are listed as applicable. Selections of this product are performed through AT&T Services Inc. NP&E on behalf of the entire AT&T Enterprise. Each approved provider shall be used using AT&T approved PIDs, distributors and pricing.

1.9

Reasons for Reissue

The Reason for Reissue part of this section identifies the changes made to this document when it is revised.

1. Section 4

2. Section 5

3. Section 7

Appendix B, ATT-TP-76450 Checklist

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Common Systems Connection Standards AT&T Services, Inc Date: June 2013 ATT-TP-76450, Issue 15

2 DC / AC Power Interconnection Standards

2.1 GENERAL

2.1.1

Nominal –48V DC is the standard platform for power delivery to all network equipment. If manufacturer’s network equipment uses other than -48V DC, it shall be provided with internal inverters and converters to meet the intent of this requirement. The design criterion of the nominal -48V DC power is based on a normal operating voltage between -50V to -56.7 V DC, with nominal rating of -48v DC and low voltage of -40v DC measured at the input terminals of the network equipment.

2.1.2

Equipment shall preferably be DC powered. Equipment that requires AC power shall be located in a room with one hour fire walls separated from DC powered equipment and be powered by an inverter on the -48V DC power system. If the AC powered equipment cannot be placed in a one hour fire rated area, it will require NEBS Level 1 compliance. The proposed use of inverter fed AC powered equipment shall be reviewed by GES Common Systems on a case-by-case basis and will only be approved when a comparable DC version of the equipment is not made by the manufacturer or is not otherwise available.

2.2

2.2.1

Redundant power feeders are required for all network equipment. Each element/shelf/circuit pack, whichever is the smallest independent load device of the equipment, shall obtain power from at least two power feeds.

2.2.2

Redundant power feeder information must be provided in the supplier's response documentation to be in compliance with this item. Power feeds (supply and return ) provided by manufacturer’s shop wired configurations shall be paired and closely coupled.

2.2.3

Each power feeder shall have its own battery return conductor. This design concept shall also carry through directly to each piece of equipment.

2.2.4

Equipment battery return configuration shall be DC-I. Equipment configured with the battery return and chassis ground bonded together (DC-C) shall not be deployed in the network. The DC-C configuration cannot be utilized with dual plant operation.

Nominal -48v DC

AC Powered Equipment

DC Power Cabling

Redundant Power Feeds

Power Feeder Information

Battery Return Conductor

Battery Return Configuration DC-I

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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 nonmetallic, non-flammable cover.

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2.3.2

Front Power Terminations.

Equipment designed as “front access only” (no rear access allowed) shall have the power terminations on the front of the equipment. All power leads entering the front or side shall be protected from accidental bumps, pulls and hits. All power connections shall be clearly labeled. DC power terminations shall be fully protected with a non-metallic, non-flammable cover.

2.4

DC Connectors

Connectors used to attach the product to external power cabling shall conform to the following requirements:

2.4.1

8 AWG and Larger Stranded Power Cable

Power input cable that will accept # 8 AWG or larger connector terminations shall use dual threaded post (stud) termination able to accept the appropriate two-hole crimp connection. The two post termination may be either 1’,3/4”, 5/8” or 1/2“ on centers. Refer to Table 2-1 for

acceptable connectors.

2.4.2

16 AWG to 10 AWG Stranded Power Cable

For applications where the size of wire supplying or distributing power to/from the equipment is 16 AWG to 10 AWG stranded power cable, pressure crimped ring type connectors shall be used on the power cable. Refer to Table 2-1 for acceptable connectors.

2.4.3

Equipment surface terminations shall accept crimp connections that meet the following specifications for 16 AWG and larger stranded power cable:

o UL486A Wire Connectors and Soldering Lugs for Use with Copper o UL467 Grounding and Bonding Equipment Conductors o UL 486C Splicing Wire Connectors o SAE-AS25036 (Insulated Copper Ring Crimped Terminal - Dimensions) o SAE-AS7928 (Copper Ring Crimped Terminal - Specifications)

Equipment submitted for approval should provide a UL listed (power) termination strip designed and designated as “field wireable” to insure product compliance with the UL listing of the product. This termination or barrier strip should be able to accommodate a ring lug connectors that comply with the UL, CSA and Mil Spec listings.

2.4.4

18 AWG Power Cable and Smaller

For applications where the size of wire supplying power to the equipment is 18 AWG power cable or smaller, mechanical connectors may be used. Refer to Table 2-1 for acceptable

connectors.

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Common Systems Connection Standards AT&T Services, Inc Date: June 2013 ATT-TP-76450, Issue 15

2.4.5

Connectors and Hardware

Refer to Table 2-1 for acceptable connectors.

o The connectors shall be listed by a Nationally Recognized Test Laboratory for its

intended use.

o The connector shall be tested to assure long-term tightness and reliability. The

following tests are acceptable for this requirement; IEC 60068-2-6, Basic Environmental Test Procedures, Part 2: Test Fc and Guidance: Vibration (sinusoidal); EIA Specifications 364-27B (Mechanical Shock Test Procedure for Electrical Connectors), 364-28D (Vibration Test Procedure for Electrical Connectors and Sockets), Telcordia GR-63-CORE and Telcordia GR-1089CORE. Other vibration test procedures demonstrating long-term reliability will be considered for evaluation.

o The product supplier shall provide documentation of routine maintenance (if any)

associated with the supplied connector.

o Wago type pressure spring connectors, connectors that crush the wire with a

srew and snap-on type power connections are not approved for use and will be denied compliance.

o Connecting hardware ( bolts, nuts and washers) shall be Durium or silicon-

bronze per ASTM B99. The Ny-Loc type nuts are not approved for use and will result in non-compliance.

Table 2 – 1

Acceptable termination Associated Listings

22 AWG – 18 AWG

16 AWG – 10 AWG

Mechanical; American Standard UNC threads (Class 2 fit) One or Two hole crimp connection. American Standard UNC threads

Listed by NRTL, IEC 60068-2-6, EIA SPEC 364-27B, 364-28D UL467, UL486A, UL486C, SAE-AS25036, SAE-AS7928

(Class 2 fit) 8 AWG – 1AWG 1/0-4/0 250MCM – 750MCM

Two hole crimp

connection. American

Standard UNC threads

(Class 2 fit)

UL467, UL486A, UL486C, SAE-AS25036, SAE-AS7928

A “YES” for 2.4.5 indicates compliance to Table 2-1 and non-approved connectors are not being utilized.

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2.5

AC Connectors

AC power connectors shall be of a type to provide locking. This locking mechanism shall prevent the connection from being accidently dislodged. Acceptable locking connectors are:

Twist lock

Having a locking guard that mounts to the chassis to prevent accidental dislodging

A “YES” indicates compliance to 2.5

2.6

DC Equipment Power Protection

2.6.1

Circuit Breakers / No Power Protection

If the shelf / system being evaluated does not utilize power protection, an approved bay mounted fuse panel (SPDU) shall be required. The panel shall utilize an approved Telcom or Telpower fuse type as listed on the AT&T DC Power Minor Material List. The use of circuit breakers or non-field replaceable fuses for shelf / system power protection is considered NonStandard Circuit breakers will be considered an “on – off” switch for the equipment with fused circuit protection required at the bay level. Equipment utilizing fuse protection that is not “field replaceable” will require a bay mounted fuse panel.

• Circuit Breakers - Only thermal magnetic and magnetic type DC circuit breakers are acceptable. Circuit breakers should adhere to all applicable UL and ANSI standards. DC Circuit breakers that are labeled 100% are full load rated and may be sized at the same capacity as the List 2X drain.

A “YES” answer here indicates the equipment is utilizing circuit breakers or has no power protection or has fuses which are not “field replaceable” and requires a bay mounted fuse panel.

AT&T approved fused Power Distribution Units (PDU) shall be used to provide power to transport and data equipment. Power is distributed to the equipment from Battery Distribution Fuse Bays (BDFB) or an arrangement utilizing a Secondary Power Distribution Unit (SPDU). The SPDU is smaller than a BDFB in physical size and capacity.

PDUs that are independent of the network element but, included as part of the total package must meet the requirements listed in this section; must be approved for use, and should be identified by an associated AT&T PID (Product ID) number assigned by the AT&T Power Technical Staff

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2.6.2

Is the equipment planned for placement in a switching environment? A “YES” answer here will not require the use of fuses but circuit breakers are required for circuit power protection.

2.6.3

Is the equipment planned for placement in the transport environment? A “Yes” answer here will require the use of fuses or a fuse panel to interface to the power plant.

2.6.4

Fuses

Fuses are the preferred method of power protection. The equipment fuse shall be replaceable by the maintenance technician on site. If the shelf / system is protected by fuses rated at 120 amps or less, a bay mounted fuse panel is not required.

A “YES” answer here confirms that the equipment is protected by fuses rated at 120 amps or less and are replaceable by the maintenance technician on site.

Any equipment that requires more than a 70 amp fuse (56 amp load of List 2X) may necessitate modifications to the BDFB to accommodate a fuse larger than 70 amps. Individual equipment will not be directly fed from Power Board Distribution without the use of an SPDU or BDFB.

2.6.5

Approved Fuse Types

All fuses provided on the equipment and approved PDUs shall be equipped with at least one of these forms of overprotection devices, (1) GMT Fuses, (2) Telpower® Fuses, (3) Telecom TLS Fuses. The size of the DC requirement will serve as the primary qualifier. Only approved fuse types shall be utilized. The approved fuse types are GMT, TPA, TPN, TPS and TLS.

• GMT Fuses – Generally sized to accommodate 0.18 – 20 amp requirements. List 2X

demand should not exceed 80% rated fuse size.

• Telpower® Fuses – as listed above - Exclusively produced by Cooper-Bussmann,

these fuses are available in sizes from 3 amps to 600 amps, packaged in Blue to signify DC only. All Telpower® fuses should be sized at 125% of List 2X load (List 2X load not greater than 80% of their fuse faceplate rating).

• Telecom TLS Series Power Fuses – Exclusively manufactured by Littelfuse shall be

used in the 3-125A sizes with the Canadian Shunt TFD101-011-01 fuse disconnect/fuse holder. Littelfuse TLS fuses should be sized at 125% of List 2X load (List 2X load not greater than 80% of their fuse faceplate rating).

A “YES” answer here confirms that the equipment is protected by an approved fuse type rated at 120 amps or less.

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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.

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Synchronization/Timing Standards

This section addresses the synchronization reference input of the device or system under consideration, if applicable. Synchronization is not covered in the GR’s associated with NEBS. Synchronization and synchronization input reference interfaces are documented in Telcordia GR-1244-CORE and GR-499-CORE.

Issue 14 is a complete revision to section 3, Synchronization/Timing Standards. Network elements that were traditionally part of the outside plant and cellular base station environments are now coming under the AT&T TP-76450 interconnection review process. It is understood that some of these network elements are not designed to traditional wireline CO equipment standards. It is very helpful if the respondent submits a copy of the equipment supplier’s documentation for any timing and synchronization requirements of the device under consideration. In addition, respondents are encouraged to contact the AT&T Common Systems synchronization SME to discuss the requirements and context of this section.

David Overdorf email do3863@att.com Telephone 770-232-9183

The AT&T Common Systems synchronization SME acknowledges the variability and complexity of timing solutions that can be present with much of the equipment now being introduced into the network. Many new systems are based upon router and switch technology rather than traditional TDM and SONET technology. In addition, there is variability in the timing requirements based upon the actual deployment mode. It is difficult to capture all the possible variables in a checklist or questionnaire type document. The AT&T Common Systems synchronization SME welcomes suggestions for improvements to the contents of section 3.

The original purpose of this section is to determine if the device under consideration has a synchronization interface to accept external frequency timing references from the Building Integrated Timing Supply system (BITS), and if so, does the interface meet existing North American standards for interconnection and timing signal format. If there is a frequency timing input reference interface, but the interface is not compliant to AT&T standards, the respondent is asked to identify the proposed method for mitigating the non-compliant interface.

We now see systems that require some sort of timing or synchronization, but are not designed to interconnect directly to a traditional timing signal generator with a physical twisted pair of wires. This section now attempts to determine if some non-traditional synchronization solution, such as a dedicated GPS antenna and receiver, IEEE-1588v2 based Precision Time Protocol (PTP), or Network Time Protocol (NTP) will be employed. In the case of PTP and NTP solutions, the respondent is asked for details on timing precision requirements of the device under consideration.

For the purposes of this section, ‘synchronous interfaces’ shall include DS0 digital, T1, and SONET. E1 and SDH may be supported in some specific applications, but are not consistent with North American network standards. Synchronous Ethernet is not currently under

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