Decoding 100G QSFP28 Transceiver

in Vibez "Peppstreet Methtematikz" KOMMT!!! 05.05.2018 05:29
von buzai232 | 79 Beiträge | 7005 Punkte

Decoding 100G QSFP28 Transceiver

Today, the trend for 100G is bullish and inevitable. To achieve 100G network, you can use 100G transceivers such as CXP, CFP, CFP2, CPAK, CFP4 and QSFP28. Among those optical modules that are capable of connecting 100G traffic, QSFP28 transceiver is the most preferred module with smallest size and lowest power consumption.

100G QSFP28 transceivers come in types like 100GBASE-SR4, 100GBASE-PSM4,look at this web-site 100GBASE-CWDM4 and 100GBASE-LR4, which have different interfaces. For 100GBASE-SR4 QSFP28 and 100GBASE-PSM4 QSFP28 transceiver, they are designed with MTP/MPO interface. This kind of QSFP28 module offers 4 independent full-duplex transmit and receiver channels, and each is capable of running up to 28Gpbs data rate per channel. Equipped with 100G QSFP28 MPO interface, these transceivers should be connected with a 12-fiber MTP/MPO patch cable.For 100GBASE-CWDM4 QSFP28 and 100GBASE-LR4 QSFP28, they are configured with duplex LC interface. 100GGBASE-CWDM4 QSFP28 integrates transmit and receive path in one module with 4 lanes of optical signals (25.78125Gbps per lane) being multiplexed into an LC connector on the transmit side. And 100GBASE-LR4 QSFP28 is a fully 4x25Gbps transceiver module, which also works by multiplexing and de-multiplexing optical signals. They are all duplex modules and have to operate over single-mode fiber cable with duplex LC connector.100G QSFP28 Transceiver can be used for both short-distance and long-distance transmission. For long link length, 100G QSFP28 LR4 transceivers are often adopted. They are designed for use in 100 Gigabit Ethernet links on up to 10km of single mode fiber, and compliant with the QSFP28 MSA, IEEE 802.3ba 100GBASE-LR4 and IEEE 802.3bm CAUI-4. The table below displays the maximum link length supported by other 100G QSFP28 transceivers.
The transmission distance of above mentioned 100G optical transceiver modules are restricted by 10km. What about if customers need to build a ultra long-haul network over 10km? Can 100G QSFP28 handle such a long distance? Now with the advent of 100G QSFP28 ER4, this can be achieved! Not very long ago, QSFP28 ER4 was still a promise and didn’t exist. But now some vendors like FS.COM can already provide it. It can support a distance up to 40km. Besides, 100G QSFP28 ZR4 transceiver is also said to be available this year, which will be able to handle a link length up to 80km.For customers who have need for upgrading to 100G from 25G, 100G QSFP28 also provides a flexible way for your network expanding. 100GBASE-SR4 QSFP28 transceiver can be connected to 4 25GBASE-SR SFP28 transceivers in the same way as 40GBASE-SR QSFP+ transceiver to be connected to 4 10GBASE-SR SFP+ transceivers. To achieve this connection, we simply need a 12f mpo lc patch cord.

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