25G DWDM SFP28 LR CH17-CH61 10km

Q: Is FEC functionality required when using 25G DAC cables?

A: According to the IEEE 802.3by standard, FEC is not necessary for 25G DAC cables with transmission distances of 1, 2, or 3 meters. However, RS-FEC needs to be enabled for 5-meter lengths.

Q: What is a 25G dual-rate module?

A: Dual-rate refers to supporting two types of data rates. A 25G dual-rate module can support both 10G and 25G rates, allowing for switching between these speeds on supported device ports.

Q: What are the typical applications for different types of 25G optical modules?

A: Standard 25G SFP28 optical modules (like SR, LR, ER, and BiDi) are mainly used for interconnection among data center servers, switches, and routers;

25G CWDM SFP28 modules are single-mode duplex CWDM modules with a maximum rate of 25.78125Gbps, capable of transmitting up to 40km over single-mode fiber. They are primarily applied in 25G Ethernet switches, routers, NICs, and storage network devices, effectively addressing the challenges of 5G millimeter-wave front-haul;

25G DWDM SFP28 modules are designed to meet the requirements of 5G front-haul services, employing EML+APD technology with a top speed of 25.78125Gbps, capable of reaching 10km over single-mode fiber. They are widely used in 25G Ethernet and CPRI/eCPRI links over single-mode SMF, densely packing wavelengths to augment existing fiber network bandwidth;

25G LWDM SFP28 modules adopt high-performance, low-cost DML lasers, providing 12-wavelength multiplexing. In 5G front-haul applications, they offer advantages over similar 25G front-haul products, mitigating the dispersion issue of 25G CWDM modules and the high laser cost of 25G DWDM SFP modules. They ensure stable transmission while economizing on 5G front-haul transmission, making them a stable and cost-effective solution for 5G front-haul networks.

Q: Can a 25G SFP28 port support the use of 10G modules?

A: Generally, 25G ports on devices are designed to support multiple rates, such as 1G/10G/25G, enabling the use of 1G, 10G, and 25G rate modules on the same port.