Juniper PTX10001-36MR - Page 69

12-Fiber MPO Connectors
There are two types of cables used with 12-ber 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 applicaon, the cables might use
single-mode ber (SMF) or mulmode ber (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 ber end in the connector is nished correctly. Physical contact (PC) refers to ber
that has been polished at. Angled physical contact (APC) refers to ber that has been polished at an
angle. Ultra physical contact (UPC) refers to ber that has been polished at, to a ner nish. The
required ber end is listed with the connector type in the Hardware Compability Tool.
12-Fiber Ribbon Patch Cables with MPO Connectors
You can use 12-ber 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 ber. Table 28 on page 61 shows the pin-to-pin
connecons for proper polarity.
Table 27: Cable Signals for 12-Fiber Ribbon Patch Cables
Fiber Signal
1 Tx0 (Transmit)
2 Tx1 (Transmit)
3 Tx2 (Transmit)
4 Tx3 (Transmit)
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