Cabling Standard - TIA 568 B.1 - Addendum 7 - Final

12 Figure 6: Type-A Array Connector Cable or Patch Cord key-up to key-down .... 16 Figure 10: Type-B Array Connector Cable or Patch Cord key-up to key-up.... When connecting multiple dup

TIA STANDARD

ANSI/TIA-568-B 1 - 7 -200 6 Approved: January 13 , 200 6

Commercial Building Telecommunications Cabling Standard

Polarity Using Array Connectors

(Addendum No.7 to TIA-568-B.1)

January 2006

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TIA-568-B.1-7

Guidelines for Maintaining Polarity Using Array Connectors,

Addendum 7 to ANSI/TIA/EIA/568B.1

Table of Contents

FOREWORD iv

1 INTRODUCTION 1

2 SCOPE 2

3 CONNECTIVITY METHODS FOR ESTABLISHING POLARITY 2

3.1 General 2

3.1.1 Descriptions 2

3.2 Connectivity Method A 3

3.2.1 Connectivity Method A for Duplex Signals 3

3.2.2 Connectivity Method A for Parallel Signals 5

3.3 Connectivity Method B 7

3.3.1 Connectivity Method B for Duplex Signals 7

3.3.2 Connectivity Method B for Parallel Signals 9

3.4 Connectivity Method C 11

3.4.1 Connectivity Method C for Duplex Signals 11

4 GUIDELINES FOR CONNECTIVITY COMPONENTS 13

4.1 General 13

4.2 Components for Connectivity Method A 14

4.2.1 Type-A Array Connector Cables and Patch Cords 14

4.2.2 Type-A Array Adapters 14

4.2.3 Transitions 15

4.2.4 A-to-B patch cords 16

4.2.5 A-to-A Patch cords 16

4.3 Components for Connectivity Method B 17

4.3.1 Type-B Array Connector Cables and Patch Cords 17

4.3.2 Type-B Array Adapters 17

4.3.3 Transitions 17

4.3.4 A-to-B patch cords 17

4.4 Components for Connectivity Method C 18

4.4.1 Type-C Array Connector Cables 18

4.4.2 Type-A Array Adapters 18

4.4.3 Transitions 18

4.4.4 A-to-B patch cords 18

iii

List of Figures

Figure 1: Connectivity Method A for Duplex Signals 4

Figure 2: Connectivity Method A for Parallel Signals 6

Figure 3: Connectivity Method B for Duplex Signals 8

Figure 4: Connectivity Method B for Parallel Signals 10

Figure 5: Connectivity Method C for Duplex Signals 12

Figure 6: Type-A Array Connector Cable or Patch Cord (key-up to key-down) 14

Figure 7: Transition 15

Figure 8: A-to-B Duplex Patch Cord 16

Figure 9: A-to-A Duplex Patch Cord 16

Figure 10: Type-B Array Connector Cable or Patch Cord (key-up to key-up) 17

Figure 11: Type C Array Connector Cable (pair-wise flipped, key-up to key-down) 18

List of tables Table 1: Summary of Components Used for Duplex Signals 13

Table 2: Summary of Components Used for Parallel Signals 13

TIA-568-B.1-7

FOREWORD

(This foreword is not part of this Standard) After ANSI/TIA/EIA-568-B.1 was approved for publication, it was realized that there was

a need to explain and illustrate the concept of maintaining optical fiber polarity using

array connectors The TIA TR-42 Engineering Committee on Premises

Telecommunications Cabling Infrastructure accepted the task and assigned it to the

TR-42.8 Subcommittee, Telecommunications Optical Fiber Cabling Systems The TR-TR-42.8

Subcommittee cooperated with the TR-42.1 Subcommittee on Commercial Building

Cabling, which is related to this activity, in preparing this document

TIA standards are developed within the Technical Engineering Committees of the TIA

and the standards coordinating committees of the TIA standards board Members of the

committees serve voluntarily and without commission The companies that they

represent are not necessarily members of the TIA The standards developed within the

TIA represent a consensus of the broad expertise on the subject This expertise comes

from within the TIA as well as those outside of the TIA that have an expressed interest

The viewpoint expressed at the time that this Telecommunication Systems Bulletin was

approved was from the contributors’ experience and the state of the art at that time

Users are encouraged to verify that they have the latest revision of the standard

1

1 INTRODUCTION

To support bi-directional communication systems that use separate optical fibers in each direction, the cabling system must provide correct signal polarity so that the transmitter on one end of the channel will connect to the receiver on the other end Maintaining the correct transmit-to-receive polarity throughout the cabling system is critical for system operation Following certain cable polarity guidelines when installing the cabling system will simplify channel connectivity

Correct polarity is administered according to the requirements of the depicted methods Intermixing the components of these methods may result in incorrect polarity

The increasing use of optical connectivity in data communications networks (particularly in areas of highly concentrated equipment, such as data centers) is driving the need for more compact forms of connectivity Array connectors are one way of meeting this need Since the polarity requirements for array connectors extend beyond the commonly deployed duplex (A-B) polarity, additional guidance is provided in this addendum for maintaining polarity of networks utilizing array connectors

For illustrative purposes, the figures throughout this document depict the MPO array connector and 568SC duplex connector Other connector types are permitted, provided the fiber ordering arrangement is maintained relative to the plug’s keying features, as shown in the figures

The figures in this document show connectors labeled with fiber position numbers This is done for reference only; it is not a requirement of this standard that connectors be labeled with a fiber number

TIA-568-B.1-7

2 SCOPE

This Standard provides guidelines for establishing transmit-to-receive polarity using array connectors The methods presented in this document provide different options for implementing polarity Once a method is selected the details in that method shall be followed

B, and C No preference or priority is implied by this notation

When mating connectors that use alignment pins (such as the MPO and MT-RJ) it is critical that one plug is pinned and the other plug is unpinned The pinned connector is typically located inside the panel That is, the connector that stays in place is pinned; the connector that is frequently removed & handled is unpinned As MT-RJ or MPO transceivers typically have pins, this convention leads to the following implementation on initial build out:

• Patch cords from transceiver to panel are typically unpinned on both ends

• Transitions (mounted behind the panel) are typically pinned

• Cables from rack to rack are typically unpinned on both ends

Array connectors can be flat or angle polished Flat-polished connectors do not optically mate with angle-polished connectors

3.1.1 Descriptions

A-to-B patch cord: A duplex patch cord that connects position A on one end of the patch cord

to position B on the other end of the patch cord See section 4.2.4

A-to-A patch cord: A duplex patch cord that connects position A on one end of the patch cord

to position A on the other end of the patch cord See section 4.2.5

Array Connector: An optical fiber connector containing a single ferrule with multiple terminated

fibers arranged in a line or a series of lines

Transition: An assembly of optical fibers and connectors, with an array connector on one end

and simplex or duplex connectors on other end

3

3.2 Connectivity Method A

3.2.1 Connectivity Method A for Duplex Signals

Implementation of Connectivity Method A for duplex signals is shown in Figure 1

When connecting multiple duplex optical transceiver ports, the Type-A backbone (composed of one or many Type-A array connector cables mated in Type-A adapters) is connected on each end to a transition On one end of the optical link, A-to-B patch cords are used to connect ports

on the transition to their respective duplex transceiver ports On the other end of the optical link, A-to-A patch cords are used to connect ports on the transition to their respective duplex transceiver ports In each optical path there shall be one and only one A-to-A patch cord

Guidelines for the construction of the cabling components used to implement Method A are given in Section 4.2

TIA-568-B.1-7

A-to-B Patch Cord

Type-A Array Connector Cable

A-to-A Patch Cord

5

3.2.2 Connectivity Method A for Parallel Signals

Implementation of Connectivity Method A for parallel signals is shown in Figure 2

When connecting parallel signals, the Type-A backbone (composed of one or many Type-A array connector cables mated in Type-A adapters) is connected on each end to a patch panel

On one end of the optical link, a Type-A array patch cord is used to connect patch panel ports to their respective parallel transceiver ports On the other end of the optical link, a Type-B array patch cord is used to connect panel ports to their respective parallel transceiver ports In each optical path there shall be one and only one Type-B array patch cord

Guidelines for the construction of the cabling components used to implement Method A for parallel signals are given in Sections 4.2 and 4.3

TIA-568-B.1-7

Type-A Array Connector Cable

Type-B Array Connector Patch CordType-A Array

Connector Patch Cord

7

3.3 Connectivity Method B

3.3.1 Connectivity Method B for Duplex Signals

Implementation of Connectivity Method B for duplex signals is shown in Figure 3

When connecting multiple duplex optical transceiver ports, the Type-B backbone (composed of one or many Type-B array connector cables mated in Type-B adapters) is connected on each end to a transition The transitions are mounted in two orientations such that their duplex adapter key orientation on one end of the backbone is rotated 180 degrees relative to their adapter key orientation on the other end of the backbone For example, one transition is installed with keys to the left and the other with keys to the right A-to-B patch cords are then used to connect ports on the transition to their respective duplex transceiver ports

Guidelines for the construction of the cabling components used to implement Method B are given in Section 4.3

When MPO connectors are used in Connectivity Method B they must be flat polished