How well do you know your QSFP28

QSFP, QSFP+ and QSFP28 transceivers look very similar because they all share the same small form-factor, but their data rate and breakout connection capabilities are quite different. If you have ever wondered whether QSFP, QSFP+ and QSFP28 modules are right for your network and what the differences between them are, then this article is for you.

if you want to be competitive, you must continually improve your network speed to meet people’s growing network needs. Over the past few years, 40G networks is very popular, and now according to authoritative statistics, by 2018, the world will have 38% of service providers to deploy 100G network, which means 100G era has arrived.The QSFP28 pluggable optic differs from QSFP and QSFP+ in that each lane can support up to 4x28G data rate. QSFP28 are also capable of handling 100G traffic.QSFP28 can do 4x25G breakout connection, 2x50G, or 1x100G depending on the transceiver used.Usually QSFP28 modules can’t breakout into 10G links. But if a QSFP28 module is inserted into a QSFP+ port, a QSFP28 can break out into 4x10G.The 100G QSFP28 transceiver module is a high-density, high-speed product designed for 100Gbps applications. It has the same form factor as the QSFP+ transceivers.The encapsulation of 100G QSFP28 optical module and 40G QSFP + optical module is the same , and both are using four Fiber Channel to transmit data, the difference is that the transmission rate of 100G QSFP28 optical module fiber channel can be up to 28Gbps, mainly for 100G transmission applications Compared to 100G CFP optical modules, the 100G QSFP28 optical module is better suited for high-density cabling and is widely favored by most data centers.

QSFP28 100G optics offers four channels of high-speed differential signals with data rates ranging from 25 Gbps up to potentially 40 Gbps, and finally meet 100 Gbps Ethernet (4×25 Gbps) and 100 Gbps 4X InfiniBand Enhanced Data Rate (EDR) requirements. QSFP28 transceiver recently is typically available in several standards—100GBASE-SR4, 100GBASE-LR4, 100GbASE-PSM4 and 100GBASE-CWDM4. QSFP28-100G-SR4 operates over multimode fiber for a distance of 100 m. While 100GBASE-LR4 QSFP28 supports a much longer distance of 10 km. Compared with CFP form factors, QSFP28 optics are more popular on the 100G optics market.