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How To Choose QSFP28 Optics For 100GbE Deployment

2023-04-28 16:13:55

Copper DAC Used Inside Racks: 1-5 m
QSFP28 passive DAC products include QSFP28 to QSFP28 DACs and QSFP28 to 4x SFP28 DACs are ideal to use for reaches within 5 m, providing a very cost-effective I/O solution for 100GbE connectivity. In stead of discrete components, QSFP28 DACs offers a complete cable assembly for short distance connectivity in a cost-effective manner. If your 100GbE deployment is within 5m intra racks, the DAC is ideal for you.

Multimode Fiber Use Between Switches: 5-100 m
For 100GbE cabling with multimode fiber between switches, there are two options. One is to use QSFP28 AOC which is the best fit for 3-20 meters. And the other option is to use QSFP28 SR4 transceiver with 12-fiber MTP OM3/OM4 cable. SR4 with 12-fiber OM4 MTP fiber cable can support reaches up to 100 m. If you want to use multimode fiber for connectivity, you could choose either QSFP28 AOC or SR4 transceiver with 12-fiber MTP cable. This depends on your reaches and cost consideration.

Single-Mode Fiber Use Between Switches: >100 m-2 km
Reaches over 100 m but less than 2 km are usually called mid-reaches. For most large data center operators, a 100GbE solution which can satisfy the mid-reach connectivity in a cost-effective way is their sweet-spot. PSM4 and CWDM4/CLR4 (view difference between CWDM4 & CLR4) transceivers which can respectively support up to 500 m over 12-fiber MTP single-mode fiber cable and 2 km over duplex LC single-mode fiber cable are recommended here. For more details about PSM4 and CWDM4 in 100G Ethernet, you can visit the previous post by clicking here.

Single-Mode Fiber for Long Span: ≤10km
For very long span 100GbE deployment, such as connectivity between two building, mostly up to 10 km, QSFP28-100G-LR4 with duplex LC single-mode fiber cable is the preferred option defined by IEEE. But now, cost of QSFP28 LR4 is still very high.

Summary
After reading the above content, do you know what is best for you now? 3Coptics offers a full series of 100G products and professional service for you which helps you with your worry on 100G QSFP28 optics selection. For more information, please visit www.3coptics.com or contact sales@3coptics.com.