40G QSFP+ SR4 850nm 100m

Q: Can a 40G-LR4 optical module be split into 4x10G connections?

A: No, a 40G-LR4 optical module cannot be split into 4x10G connections. The 40GBASE-LR4 operates using 4 wavelengths (or lambdas) over a pair of single-mode fibers and does not divide itself into four pairs unless wavelength division is implemented. The uniqueness of 40GBASE-SR4 lies in its use of parallel fibers, allowing for simultaneous use of 4 pairs of parallel fibers. Both 40G-PLRL4 and 40G-PLR4 standards support 4x10G, employing 12-fiber single-mode MTP ribbon fiber, and are fully compatible with 10GBASE-LR and 10G-LR, achieving their maximum transmission distances.

Q: What is the transmission performance of the 40GbE PLRL4 standard?

A: The 40G Parallel LR4 Lite (PLRL4), based on the 10GBASE-LR standard, offers a transmission distance of 1 kilometer over single-mode fiber. Additionally, 40GbE PLRL4 optical devices, by leveraging a 4x10G configuration, can support 4 independent 10G-LR connections via breakout cables or single-mode fiber boxes.

Q: What type of fiber does the PLRL4 and PLR4 optical module require?

A: PLR4 and PLRL4 utilize 12-fiber MTP optical connectors and require an APC (Angle Polished Connector) single-mode 12-fiber MTP fiber. This fiber is akin to a 40G-SR4 MTP-MTP fiber, with the distinction of using single-mode fiber instead. UPC (Ultra Physical Contact) fiber connectors are another type of 12-fiber MTP connector but are not suitable for single-mode fiber. APC is the only viable option for single-mode 12-fiber MTP fiber.

QSFP+ to QSFP+ and QSFP+ to 4SFP+ copper cables cater to short-distance connections, while for longer distances, ETU provides a full range of optical modules catering to various fiber types and distances.

Q: What are the pros and cons of QSFP+ DAC high-speed cables?

A: QSFP+ DAC high-speed cables offer benefits of low cost, low power consumption, high interchangeability, and plug-and-play functionality, but they are heavy, bulky, inconvenient for transportation, have limited transmission distances, and can be challenging to manage. QSFP+ AOC high-speed cables are lightweight, have greater bandwidth, and offer electromagnetic interference resistance, ensuring enhanced secure transmission performance.

Q: How to choose the appropriate QSFP+ DAC high-speed cable and QSFP+ AOC high-speed cable?

A: When the transmission distance is less than 15 meters, QSFP+ DAC high-speed cables present the most cost-effective solution. For distances between 15 meters and 100 meters, it’s recommended to use a 40G QSFP+ AOC high-speed cable. Beyond 100 meters, one can employ 40G SR4 optical modules with OM3 or OM4 fiber patch cords, or use 40GBASE LR4 optical modules with single-mode fiber patch cords to attain longer transmission distances.

Q: What are the typical solutions for a 40G network?

A: At the core of the 40G network layer, a common approach involves connecting a pair of optical modules (typically 40G QSFP+ modules) at each end of multimode fibers like OM3 or OM4, primarily utilized for long-distance transmissions. High-speed cables and active optical cables frequently serve as cost-saving alternatives to these optical modules and fibers for short-range interconnect applications.