Table of Contents
Advertisement
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
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 27 on page 60
describes the signals on each fiber.
connections for proper polarity.
Table 27: Cable Signals for 12-Fiber Ribbon Patch Cables
Fiber
1
2
3
4
Hardware Compatibility
Table 28 on page 61
Signal
Tx0 (Transmit)
Tx1 (Transmit)
Tx2 (Transmit)
Tx3 (Transmit)
key up
Tool.
shows the pin-to-pin
60
Advertisement
Table of Contents
