Juniper ACX7100-32C Hardware Manual page 52

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 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. The
required fiber end is listed 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 21 on page 44 describes the signals on each fiber.
connections for proper polarity.
Table 21: Cable Signals for 12-Fiber Ribbon Patch Cables
Fiber
1
2
3
4
Hardware Compatibility
Table 22 on page 45
Signal
Tx0 (Transmit)
Tx1 (Transmit)
Tx2 (Transmit)
Tx3 (Transmit)
key up
Tool.
shows the pin-to-pin
44