Which kind of MPO to MPO cable do I want for my transceiver?
Parallel fiber polarity types necessary for Ethernet applications depends on the fiber topology being used. There is nobody answer and, at least for laser optimized OM3 and OM4 MMF , doesn’t depend on speed. Distance could be different for 40Gb and 100Gb, but Ethernet fiber MPO polarity is usually independent of speed for Ethernet applications. The essential requirement is usually to deliver the Tx fiber positions using one transceiver to the Rx fiber positions on the other transceiver (and vice versa) - but this is done in several different ways.
For a link between two MPO optical transceivers utilizing a single patch cord between transceivers - i.e. no patch panels or cassettes in the fiber path - with either 12 or 24 fiber (8 or 20 fibers used for Ethernet) you'll use a Type B cable. Type B offers a reverse of the Ethernet Tx and Rx fiber positions in a key up - key up orientation of the cable to provide the Ethernet Tx fiber positions on one end to the Rx fiber positions on the other end. This configuration is commonly used so the 10345 and 10346 MPO 12 fiber patch cords you can expect are Type B. 24 fiber MPO used for SR10 is analogous - use a sort B for an individual patch cord connection.
However, if you're going right through a patch panel or cassette structured wiring infrastructure, then “this will depend”. Structured wiring may or might not supply the reverse of the fiber positions within the cabling plant itself therefore the customer must, in this instance, know what offers been deployed within their fiber plant. There will vary conventions that customers could possess adopted. Based on the infrastructure, the client may necessitate Type A patch cords on each end or a Type A using one end and a sort B on the other - again, depends upon how their structured wiring was implemented. Type A cabling could be regarded as a straight through cable without reverse of the fiber positions in an integral up - key up cable orientation.
The just definitive statement we are able to make is that for 40Gb or 100Gb Ethernet parallel fiber applications, you might never (ever) use type C cabling any place in the fiber path . Type C is utilized to move duplex fiber connections across a higher density parallel fiber infrastructure, so could not be compatible with 40Gb or 100Gb Ethernet fiber polarity requirements. Type C isn't appropriate for 40Gb or 100Gb breakout applications either and implements different fiber pairing than used for Ethernet breakout.
For a link between two MPO optical transceivers utilizing a single patch cord between transceivers - i.e. no patch panels or cassettes in the fiber path - with either 12 or 24 fiber (8 or 20 fibers used for Ethernet) you'll use a Type B cable. Type B offers a reverse of the Ethernet Tx and Rx fiber positions in a key up - key up orientation of the cable to provide the Ethernet Tx fiber positions on one end to the Rx fiber positions on the other end. This configuration is commonly used so the 10345 and 10346 MPO 12 fiber patch cords you can expect are Type B. 24 fiber MPO used for SR10 is analogous - use a sort B for an individual patch cord connection.
However, if you're going right through a patch panel or cassette structured wiring infrastructure, then “this will depend”. Structured wiring may or might not supply the reverse of the fiber positions within the cabling plant itself therefore the customer must, in this instance, know what offers been deployed within their fiber plant. There will vary conventions that customers could possess adopted. Based on the infrastructure, the client may necessitate Type A patch cords on each end or a Type A using one end and a sort B on the other - again, depends upon how their structured wiring was implemented. Type A cabling could be regarded as a straight through cable without reverse of the fiber positions in an integral up - key up cable orientation.
The just definitive statement we are able to make is that for 40Gb or 100Gb Ethernet parallel fiber applications, you might never (ever) use type C cabling any place in the fiber path . Type C is utilized to move duplex fiber connections across a higher density parallel fiber infrastructure, so could not be compatible with 40Gb or 100Gb Ethernet fiber polarity requirements. Type C isn't appropriate for 40Gb or 100Gb breakout applications either and implements different fiber pairing than used for Ethernet breakout.
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