CNWhat are the differences and connections between 25G/50G/100G technologies（1）
Over the past decade, 10G and 40G technologies have dominated the Ethernet market. However, with users' demand for high bandwidth and the development of special applications, 25G/50G/100G technologies are gaining more and more attention from users. They gradually stand out in network deployment by providing effective paths for high speed. Let's focus on the 25G/50G/100G technologies and their relationships.
25G Technology
The 25G Ethernet standard was specially introduced by IEEE for servers in cloud data centers in 2016, several years later than the 10G/40G/100G Ethernet standard.
25G mainly adopted the SerDes is the advantage of technology, the technology is a kind of mainstream time division multiplex (TDM), peer-to-peer (P2P) serial communication technology, it can make full use of the channel capacity of transmission media, the maximum extent to reduce the required transmission channel and the number of device pins, so as to improve the transmission rate of the signal, greatly reduce the communication cost.
Currently, the components used in most switches run SerDes with a clock rate of about 10Ghz, providing 10Gbps transfer rates between components. Due to the rapid development of SerDes technology in recent years, the clock rate of 25Ghz SerDes has become one of the economically viable options, resulting in the cost and benefit differences between 10G and 40G and 25G. Such as:
10G VS 25G: The same SerDes channel, 25G provides 2.5 times more throughput than 10G. When a 10 GBIT/s network is upgraded to 25G, the 25G SFP28 optical module can use the LC jumper used for 10G network cabling without rewiring. Therefore, the cost is effectively saved.
40G VS 25G： 40G uses four 10G Fibre channels (SerDes with a clock rate of 12.5ghz), while 25G uses SerDes as a single channel, so 25G provides higher port density. At the same time, most 40G QSFP+ optical transceivers on the market need to be used together with MTP/MPO patch cord, so 10G-40G inevitably increases cable costs.
