As you might understand that 25 Gigabit Ethernet is certainly proposed standard for Ethernet connectivity in a data center environment, produced by IEEE 802.3 task force P802.3by. The IEEE 802.3bj standard then uses technology defined for 100 Gigabit Ethernet implemented as four 25-Gbit/s lanes. These standards define

a single-lane 25 Gbit/s 25GBASE-KR PHY for printed circuit backplanes

(a single-lane 25 Gbit/s 25GBASE-CR-S PHY for 3 m twin-ax cables (in-rack

(a single-lane 25 Gbit/s 25GBASE-CR-L PHY for 5 m twin-ax cables (inter-rack

a single-lane 25 Gbit/s 25GBASE-SR PHY for 100 m OM4 or 70 m OM3 multi-mode optical fiber

Based on the above standards, the IEEE CFI is currently centered on the SFP28 and QSFP28 direct attach copper twin-ax cables (DACs). SFP28 DAC refers to the 25G DAC cable using the SFP+ form factor, and QSFP28 DAC identifies the 100G DAC cable using the QSFP+ form factor. The utmost transmission distance of these cables is normally 5 meters

There are two SFP28 cable types: Cisco SFP-H25G-CU2M and 100G QSFP28 to four SFP28 breakout DAC. The SFP28 to SFP28 passive copper cable is a higher speed, cost-effective 25Gbp/s Ethernet connectivity solution made to meet up with the growing needs for higher bandwidth in data centers. The QSFP28 to four SFP28 breakout DAC is utilized for connecting 100G switches to four 25 Gigabit in cabinet or adjacent cabinet servers. In comparison to 40G using four 10G lanes and 100G using 10 10G lanes, the 25G SFP28 DAC supplies the low-cost copper server connection for top level of Rack (ToR) switches.Learn:www.oemfibers.com