12-Fiber MPO Connectors
There are two types of cables used with 12-fiber MPO connectors on Juniper Networks devices—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 opposite 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 it is not required to purchase cables from Juniper Networks.
Ensure that you order cables with the correct polarity. Vendors refer to these crossover cables as key up
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. The required fiber
end is listed with the connector type in the Hardware Compatibility Tool.
12-Fiber Ribbon Patch Cables with MPO Connectors
You can use 12-fiber ribbon patch cables with female 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 22 on page 60 describes the signals on each fiber. Table 23 on page 61 shows the pin-to-pin
connections for proper polarity.
Table 22: Cable Signals for 12-Fiber Ribbon Patch Cables
SignalFiber
Tx0 (Transmit)1
Tx1 (Transmit)2
Tx2 (Transmit)3
Tx3 (Transmit)4
Unused5
Unused6
Unused7
Unused8
60
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