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CAUTION: To maintain agency approvals, you must use only a properly constructed,
shielded cable.
NOTE: The terms multifiber push-on (MPO) and multifiber termination push-on (MTP) describe
the same connector type. The rest of this topic uses MPO to mean MPO or MTP.
12-Fiber MPO Connectors
The 12-fiber MPO connectors on Juniper Networks devices use two types of cables—patch cables with
MPO connectors on both ends, and breakout cables with an MPO connector on one end and four LC
duplex connectors on the other end. Depending on the application, the cables might use single-mode
fiber (SMF) or multimode fiber (MMF). Juniper Networks sells cables that meet the supported
transceiver requirements, but you are not required to purchase cables from Juniper Networks.
Ensure that you order cables with the correct polarity. Vendors refer to these crossover cables as
to key up , latch up to latch up , Type B , or Method B . If you are using patch panels between two
transceivers, ensure that the proper polarity is maintained through the cable plant.
Also, ensure that the fiber end in the connector is finished correctly. Physical contact (PC) refers to fiber
that has been polished flat. Angled physical contact (APC) refers to fiber that has been polished at an
angle. Ultra physical contact (UPC) refers to fiber that has been polished flat to a finer finish. You can
determine the required fiber end with the connector type in the
12-Fiber Ribbon Patch Cables with MPO Connectors
You can use 12-fiber ribbon patch cables with socket MPO connectors to connect two transceivers of
the same type—for example, 40GBASE-SR4-to-40GBASESR4 or 100GBASE-SR4-to-100GBASE-SR4.
You can also connect 4x10GBASE-LR or 4x10GBASE-SR transceivers by using patch cables—for
example, 4x10GBASE-LR-to-4x10GBASE-LR or 4x10GBASE-SR-to-4x10GBASE-SR—instead of
breaking the signal out into four separate signals.
Table 24 on page 57
describes the signals on each fiber.
connections for proper polarity.
Hardware Compatibility
Table 25 on page 57
shows the pin-to-pin
56
key up
Tool.
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