Understanding Fiber Polarity

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Neal Sutton
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1 DATASHEET REV Understanding Fiber Polarity What's Polarity? In any installation, it is important to ensure that the optical transmitter at one end is connected to the optical receiver at the other This matching of the transmit signal (Tx) to the receive equipment (Rx) at both ends of the fiber optic link is referred to as polarity Polarity Overview Two types of fiber links are outlined in the TIA standard: serial duplex signals connections and parallel signals connections This paper discusses the impact of polarity as it pertains to serial duplex signals and parallel signals Fiber Patch cords Two types of duplex fiber patch cords are defined in the TIA standard: A-to-A type shown in Figure and A-to-B type shown in Figure Note: A-to-A patch cords are not commonly deployed and should be used only when necessary as part of a polarity method (See ANSI/TIA-8-C0) A B A-to-A Patch Cord Figure B A A B Figure B A Copyright FSCOM All Rights Reserved - -

2 DATASHEET REV MTP/MPO Fiber Adapter adapters There are two types of array adapters, and adapters shall mate two array connectors with the connector keys key-up to key-down TYPE A ADAPTER CONFIGURATION POS MALE W/PINS POS POS POS KEY-UP TO KEY-DOWN FEMALE W/O PINS adapters adapters shall mate two array connectors with the connector keys key-up to keyup (keys aligned) TYPE B ADAPTER CONFIGURATION POS MALE W/PINS POS POS FEMALE W/O PINS POS KEY-UP TO KEY-UP Copyright FSCOM All Rights Reserved - -

3 DATASHEET REV -fiber MTP/MPO array patch cord There are three different -fiber MPO/MTP-to-MPO/MTP backbone cables defined in the TIA standard The three different cables:, B and C are used for the three different connectivity Methods A, B and C respectively Straight Through Key-up to Key-Down P to P A: B: Cross Over Key-up to Key-up P to P A: B: Type C Cross Pair Key-up to Key-Down P to P A: B: Copyright FSCOM All Rights Reserved - -

4 -fiber MTP/MPO array patch cord DATASHEET REV There are three different -fiber MPO/MTP-to-MPO/MTP backbone cables defined in the TIA standard The three different cables:, B and C are used for the three different connectivity Methods A, B and C respectively Key-up to Key-Down P to P A: B: A: B: Key-up to Key-up P to P A: B: A: B: Type C Key-up to Key-Down P to P A: B: A: B: Copyright FSCOM All Rights Reserved - -

5 8-fiber MTP/MPO breakout patch cord Copyright 00-0 Fiberstore DATASHEET REV There are two different 8-fiber MPO/MTP breakout cables: and Position Position 0 Position Position 0 Page of (7) (7) Copyright sales@fiberstorecom +8 sales@fscom (7) 800 FSCOM All wwwfiberstorecom Rights sales@fiberstorecom Reserved Page of wwwfiberstorecom FSCOM - -

6 -fiber MTP/MPO breakout patch cord Copyright 00-0 Fiberstore DATASHEET REV There are two different -fiber MPO/MTP breakout cables: and Position 7 Position 8 0 Position 0 Position 8 7 Page of (7) (7) Copyright sales@fiberstorecom +8 sales@fscom (7) 800 FSCOM All wwwfiberstorecom Rights sales@fiberstorecom Reserved Page of wwwfiberstorecom FSCOM - -

7 7 0-fiber MTP/MPO breakout patch cord Copyright 00-0 Fiberstore DATASHEET REV There are three different 0-fiber MPO/MTP breakout cables:, and Type C Position Position Position Position Page of (7) (7) Copyright sales@fiberstorecom +8 sales@fscom (7) 800 FSCOM All wwwfiberstorecom Rights sales@fiberstorecom Reserved Page of wwwfiberstorecom FSCOM - 7 -

8 Copyright 00-0 Fiberstore DATASHEET REV Position Position Type C 8 -fiber MTP/MPO breakout patch cord There are three different -fiber MPO/MTP breakout cables:, and Type C 7 8 Position 0 Position Page of (7) (7) Copyright sales@fiberstorecom +8 sales@fscom (7) 800 FSCOM All wwwfiberstorecom Rights sales@fiberstorecom Reserved Page of wwwfiberstorecom FSCOM - 8 -

9 Copyright 00-0 Fiberstore DATASHEET REV Position Position Position Position Type C Page of (7) (7) Copyright sales@fiberstorecom +8 sales@fscom (7) 800 FSCOM All wwwfiberstorecom Rights sales@fiberstorecom Reserved Page of wwwfiberstorecom FSCOM - -

10 Copyright 00-0 Fiberstore DATASHEET REV Datasheet 8 MTP/MPO cassette modules 8 Base-8 series Fiber Sequence adapter 8 Base- series There are four different / Fibers MTP/MPO cassette modules:, AF(Pair Flipped), B and B Polarity Type Inner Fiber Sequence Adapter A Up-to-Down AF Up-to-Down B Up-to-Up B Up-to-Up Page of sales@fscom FSCOM Copyright FSCOM All Rights Reserved - 0 -

11 Copyright 00-0 Fiberstore DATASHEET REV Datasheet 8 Base- series There are two different Fibers MTP/MPO cassette modules:, and AF(Pair Flipped) Polarity Type Inner Fiber Sequence Adapter A Up-to-Down AF Up-to-Down Copyright FSCOM All Rights Reserved - -

12 Copyright 00-0 Fiberstore DATASHEET REV Datasheet Array polarity systems All array connectivity methods have the same goal: to create an optical path from the transmit port of one device to the receive port of another device Different methods to accomplish this goal may be implemented; however these different methods may not be interoperable Any connectivity method requires a specific combination of components to maintain polarity Some of the components may be common to other connectivity methods The components associated with the three illustrated array polarity methods A, B and C are given in below tables Table Summary of components used for duplex signals Connectivity method Array connector cable Type Array adapter Type A A A Duplex patch cord type One A-to-B & one A-to-A per duplex channel B B B A-to-B C C A A-to-B Table Summary of components used for parallel signals Connectivity method Array connector cable Type Array adapter Type Array patch cord type A A A One & one B B B Copyright FSCOM All Rights Reserved - -

13 Copyright 00-0 Fiberstore DATASHEET REV Datasheet Connectivity Method A Connectivity Method A for duplex signals A-to-A Patch Cord Note: If you don't want an A-to-A patch cord used, a TypeAF MTP/MPO cassette is needed, as shown below: F Connectivity Method A for parallel signals Copyright FSCOM All Rights Reserved - -

14 Copyright 00-0 Fiberstore DATASHEET REV Connectivity Method B Connectivity Method B for duplex signals The Key Up to Key Up (method B) does not support Singlemode with standards compliant connector endfaces Note: The transmission of the signal is P in and P out Note: The transmission of the signal is P in and P out Base-8 MTP/MPO cassette used for 0G to 0G/00G migration with Method B Copyright FSCOM All Rights Reserved - -

16 Polarity systems of -Fiber Copyright 00-0 Fiberstore DATASHEET REV The 00G-SR0 (00 GbE over multimode) requires a total of 0 fibers, 0 transmit and 0 receive Position assignment shown below is recommended by IEEE Connection of Type C -Fiber MTP/MPO patch cord Type C Type C F Copyright FSCOM All Rights Reserved - -

17 Copyright 00-0 Fiberstore DATASHEET REV Data center System Datasheet Contact Us Asia (China) F Building /F, Optics Valley Software Park, Donghu Hi-Tech Development Zone, Wuhan, Hubei, China Tel: +8 (07) 878 North America (United States) 80 SW th Street Bldg W7 Suite H Renton, WA 807 United States Tel: + (877) 0 0 Europe (Germany) Building 7, NOVA Neufahrn Gewerbepark, Am Gfild 7, 87, Neufahrn bei Freising, Munich Germany Tel: + (0) 8 7 Europe (United Kingdom) Third Floor 07 Regent Street London, WB HH United Kingdom Tel: + (0) Addresses, phone number and fax number also have been listed at wwwfscom Please e- mail us at tech@fscom or call us for assistance All statements, technical information, and recommendations related to the products here are based upon information believed to be reliable or accurate However, the accuracy or completeness thereof is not guaranteed, and no responsibility is assumed for any inaccuracies Please contact FS for more information Copyright FSCOM All Rights Reserved - -

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