AT&T 76450 User Manual

ATT-TP-76450

Common Systems Equipment Interconnection

Standards for the ATT Local Exchange Companies

and AT&T Corporation

Abstract

Presented in this document are the Common Systems Equipment Interconnection Standards for equipment placement and interconnection in the ATT LOCAL EXCHANGE companies Network. 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: 1/1/2008 Issue Date: 8/31/2007 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 Canceled/Superseded Doc: N/A Issuing Dept: ATT Services, Inc., Network Planning & Engineering (Common Systems &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: August 31, 2007 ATT-TP-76450, Issue 9

GENERAL

1.1 Requirements

This document provides the requirements for interconnection of new equipment in the AT&T Local Exchange Carrier and AT&T Corporation networks. The appendices include the ATT equipment evaluation process to be used to verify compliance to these requirements.

1.2 Purpose

The AT&T Local Exchange Company’s and AT&T Corporation’s networks is designed around fundamental standards for the purposes of meeting interconnection, safety, and industry standards such as ANSI, space considerations, and compatible technologies. 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. ATT Local Exchange is only concerned with the connectivity and interconnection issues between the OEM equipment and the telco facilities for Common Systems evaluations. OEM requirements 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 ATT standards contained in TP

76200.

Page 2

Common Systems Connection Standards AT&T Services, Inc Date: August 31, 2007 ATT-TP-76450, Issue 9

If the product uses various components that are interconnected together, 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 Local Exchange 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 ATT standard product lines shall be given.

Example: All DSX-1, DSX-3 and FDF panels will be provided by ADC Telecommunications Inc. for the ATT Local Exchange companies.

Finally, determinations will need to be made with AT&T Local Exchange 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 Local Exchange 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 ATT Local Exchange Company’s and AT&T Corporation’s 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/attnebs/.

1.6 Product Evaluation Process

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 Local Exchange companies.

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

Page 3

Common Systems Connection Standards AT&T Services, Inc Date: August 31, 2007 ATT-TP-76450, Issue 9

• TP 76300, AT&T Installation Requirements

• 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 Local Exchange companies 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.

Revisions of this section was primarily undertaken to standardize requirements from newly merged companies and affiliates including SBC Services, Inc., AT&T Corporation, and Bell South Telephone. Specific changes to Issue 8 include:

Page 4

Common Systems Connection Standards AT&T Services, Inc Date: August 31, 2007 ATT-TP-76450, Issue 9

2 DC Power Interconnection Standards

2.1 GENERAL

2.1.1 Nominal -48v DC

Nominal –48v DC is the standard platform for power delivery to any Network Element (NE). Manufacturers should comply with this requirement by providing their equipment internally with various inverters and converters to meet this condition. The design criterion of the DC power is based on a normal operating voltage of approximately -50v to -56v DC, with nominal rating of 48v DC and low voltages of -42.6v DC measured at the termination point of the network element.

2.1.1.1 AC Powered Equipment

AC powered equipment will only be considered for approval in the AT&T Telco network when the inverter is embedded as part of the total equipment package.

2.1.2 Redundant Pow er Feeds

Redundant power feeders are required for all equipment serving network elements. The term network element refers to all switching, transport, data, operator services equipment, and any adjuncts for those elements.

Each element/shelf/circuit pack, whichever is the smallest independent load device of the NE, shall obtain power from at least two power feeds. Furthermore, the return path from the power units shall have individual return cabling from the source.

The use of “OR-ing” diode technology to combine power feeders may be used to power a network element from two power sources provided all the following requirements are met:

a) Appropriately sized over-current protection devices shall be present in each power path to the unit, within the network element. b) Diodes shall also be included in each power path return of the unit. c) The maximum steady state current to be handled by the diode shall be limited to 50% of the diode’s maximum steady state current rating. d) Current transients shall not exceed the maximum rated value for the diode. e) The maximum reverse voltage across the diode shall be limited to 70% of the diode’s peak inverse voltage rating

NE shall be designed to accept diverse power cable routing with inputs on each side of the NE.

2.1 Power Feeds

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.

Page 5

Common Systems Connection Standards AT&T Services, Inc Date: August 31, 2007 ATT-TP-76450, Issue 9

2.1.3 Battery Return Conductor

2.1.3.1 Each power feeder shall have its own battery return conductor. This design concept

shall also carry through directly to each piece of equipment.

2.1.3.2 Equipment configured with the battery return and chassis ground bonded together shall not be deployed in the network.

2.1.3.3 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 documentation.

Drain Definitions

Defined below are the four drain categories used in this document.

• List 1 Drain:

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 amperage 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 it’s nominal operating voltage (float voltage).

• List 2 Drain:

Representing the peak current required to operate equipment at –42.64 vDC. This value is based on manufacturer-supplied data, and calculated to the AT&T minimum -

42.64 vDC design level and equipment configuration.

• List 2X Drain

The amperage 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 volts or the total wattage divided by 42.64volts.

2.1.4 Architecture Integration

Any equipment that requires more than a 70 amp fuse ( 56 amp load of List 2X ) may necessitate special accommodations.

2.2 POWER TERMINATIONS AT THE NETWORK ELEMENT

Page 6

Common Systems Connection Standards AT&T Services, Inc Date: August 31, 2007 ATT-TP-76450, Issue 9

This section describes the various acceptable DC power connectors and connections that are approved for use within AT&T. See Table 2-1 for a classification of acceptable power connections based on cable termination.

2.2.1 Location of Power Terminations

2.2.1.1 Rear Power Terminations

It is preferred that power terminations be located on the rear of the panel.

2.2.1.2 Front Power Terminations.

NE designed as “front access only” (no rear access allowed) shall have the power terminations on the front of the NE.

All power terminations shall be mounted in the top half of the bay. All power connections shall be clearly labeled and fully protected with a non-metallic, non-flammable cover. All power leads entering the front or side shall be protected from accidental bumps, pulls and hits.

2.3 CONNECTORS

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

2.3.1 16 AWG Stranded Power Cable and Larger

For applications where the size of wire supplying or distributing power to/from the equipment is 16 AWG stranded power cable or larger, pressure crimped connectors shall be used on the power cable creating a ring type termination.

2.3.2 Two Hole Connections

Power input terminations that will accept # 8 AWG 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 5/8” or ½ “on centers.

Equipment surface terminations shall accept crimp connections that meet the following specifications:

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

Page 7

Common Systems Connection Standards AT&T Services, Inc Date: August 31, 2007 ATT-TP-76450, Issue 9

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.

2.3.3 18 AWG Pow er 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.

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.

Table 2 – 1

Size conductor Acceptable termination Associated Listings

22 AWG – 18 AWG Mechanical; American

Standard UNC threads (Class 2 fit)

16 AWG – 10 AWG 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

2.4 Visual Power Alarms and Status Indicator

The NE equipment shall provide visual power alarm and status indications by indicator devices mounted directly on the equipment. 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.

Page 8

Common Systems Connection Standards AT&T Services, Inc Date: August 31, 2007 ATT-TP-76450, Issue 9

2.5 Fusing of Capacitors

Equipment incorporating the use of power distribution apparatus which uses capacitors shall be fused to protect the power distribution bus from a shorted capacitor. Fuse and protection information must be provided in the supplier's response documentation to be in compliance with this item. The equipment manufacturer shall provide a label indicating equipment capacitors must be pre-charged prior to power up the equipment.

2.6 POWER DISTRIBUTION DELIVERY

All power distribution products must meet the requirements listed in Section 1 of this document. AT&T approved Power Distribution Units (PDU) shall be used to power transport and data

equipment. Power is distributed to the NE 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. Direct feeds to the NE from the BDFB will be considered on a case by case basis when required. NE will not be directly fed from Power Board Distribution. Contact the AT&T Common Systems Power Technical Staff when requesting direct BDFB feed.

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

All 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, (4) DC Rated Circuit Breakers. (note: circuit breakers in PDUs shall only be fed by circuit breakers).The recommended form of DC power distribution is GMT fuses, Telpower® fuses, Telecom TLS Fuses, or Circuit Breakers, in that order. The size of the DC requirement will serve as the primary qualifier, but fuses are the preferred method of over-current protection.

• GMT Fuses – Generally sized to accommodate 0.18 – 20 amp requirements. List 2X demand should not exceed 80% rated fuse size.

Telpower® Fuses – Exclusively produced by Cooper-Bussmann, these fuses are available in sizes from 3 amps to 600 amps, packaged in Blue to signify DC only. Telpower® fuses are also available in various styles for different needs. Some of the approved styles commonly seen are TPA, TPL, TPS and TPN. 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 80-125A 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).

Page 9

Common Systems Connection Standards AT&T Services, Inc Date: August 31, 2007 ATT-TP-76450, Issue 9

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.

• NOTE: Due to the circuit protection strategy deployment found in AT&T companies, the use of circuit breakers placed in the power architecture should be avoided when a fuse provides the next step of protection (generally found at the BDFB). It is recommended that circuit breakers be protected by circuit breakers, fuses with fuses or fuses protected by circuit breakers. The use of circuit breakers placed in the embedded power distribution units found in network elements should be avoided. The preferred method of circuit protection at this level is fuses.

2.6.1 All fuses and circuit breakers shall meet Quality Level III as defined by Telcordia SR-332.

2.6.2 Filtered Battery

All Network Elements requiring “Filtered Battery” shall provide the filtering within the Network Element. (Filtered DC power PDUs are not provided by AT&T to remove excessive levels of transient noise generated within the Network Element).

2.7 Individually Mounted PDU

Even though not recommended as a choice by AT&T, some Network Elements designed by various manufacturers require specific PDUs that 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 Network Element approval, purely as an integral part of the package and its approval is exclusive to the associated network element. Furthermore, this “special PDU” should be reviewed by the Common Systems Technical Staff to insure its integrity.

2.8 NE 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, NEs requiring more that 200 amps of DC power need this type of power distribution. The NEs are commonly found in large multiple interrelatedbays.

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 recommends the use of fuses in lieu of breakers in these applications.

2.9 Direct BDFB Power Delivery

Page 10

+ 22 hidden pages

AT&T 76450 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual