Blog

December 23, 2018

What do the suffixes “SR8, DR4, xDR4 FR4 and 2FR4” stand for OSFP Modules?

The letters are reach specifications, and the number refers to the number of optical channels:

Description Connector Type
SR8: “SR” refers to 100m reach using multi-mode fiber, and “8” implies there are 8 optical channels. Each of the 8 optical channels from an SR8 module are carried on separate fibers, resulting in a total of 16 fibers (8 Tx and 8 Rx). Each optical channel operates at 50Gb/s. The SR8 module uses an MPO-16 connector to connect to 8 fiber pairs.
DR4: “DR” refers to 500m reach using single-mode fiber, and “4” implies there are 4 optical channels. Each of the 4 optical channels from a DR4 module are carried on separate fibers, resulting in a total of 8 fibers (4 Tx and 4 Rx). Each optical channel operates at 100Gb/s. The DR4 module uses an MPO-12 connector to connect to 4 fiber pairs.
XDR4: “XDR” refers to 2km reach using single-mode fiber, and “4” implies there are 4 optical channels. Each of the 4 optical channels from a DR4 module are carried on separate fibers, resulting in a total of 8 fibers (4 Tx and 4 Rx). Each optical channel operates at 100Gb/s. The DR4 module uses an MPO-12 connector to connect to 4 fiber pairs.
FR4: “FR” refers to 2km reach using single-mode fiber, and “4” implies there are 4 optical channels. Unlike the DR4 and SR8, all of the 4 optical channels from an FR4 are multiplexed onto one fiber, resulting in a total of 2 fibers from the module (1 Tx and 1 Rx). Each optical channel operates at 100Gb/s. The FR4 module uses a duplex LC connector to connect to a single fiber pair.
2FR4: The “2FR4” refers to 2 x 200G-FR4 links, and has a reach of 2km using single-mode fiber. Each of the 200G FR4 links has 4 optical channels, multiplexed onto one fiber pair (1 Tx and 1 Rx per 200G link). A 400G-2FR4 module has 2 of these links, resulting in a total of two pairs of single mode fiber (or 4 fibers total), and a total of 8 optical channels. Each optical channel operates at 50Gb/s. The 2FR4 module uses a dual CS connector to connect to 2 fiber pairs.
, , , , ,
About TARLUZ.COM