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Selecting the appropriate transceiver form factor depends on several key considerations:
1. Bandwidth Requirements
If your network traffic demands 100G connectivity today or in the foreseeable future, QSFP28 is the clear choice. For deployments where 40G remains sufficient—such as enterprise aggregation layers with moderate growth projections—QSFP+ offers a cost-effective solution.
2. Switch/Router Port Support
Verify that your network equipment supports the desired form factor. Many modern switches offer QSFP28 ports that are backward-compatible with QSFP+ modules, providing a smooth migration path. However, QSFP+ ports cannot accommodate QSFP28 modules operating at 100G.
3. Fiber Infrastructure
Consider your existing fiber plant. QSFP+ and QSFP28 both support multimode (MMF) and single-mode (SMF) fiber, but specific variants have different requirements:
SR4: Requires MPO/MTP multimode fiber with 8 or 12 fibers.
LR4/CWDM4/ER4: Use duplex LC connectors over single-mode fiber.
4. Power and Thermal Budget
QSFP28 modules consume more power (3.5–5 W) than QSFP+ modules (1.5–3.5 W). High-density 100G deployments require adequate power and cooling capacity in the host switch.
5. Cost Considerations
QSFP+ modules are generally less expensive than QSFP28 modules. For 40G connectivity, QSFP+ remains the more economical choice. However, the cost-per-gigabit of QSFP28 is significantly lower, making 100G the more efficient option for high-bandwidth applications.
6. Migration Path
QSFP28 provides a forward-looking upgrade path to higher speeds. The QSFP family continues to evolve with QSFP56 (200G) and QSFP-DD (400G/800G), both of which maintain backward compatibility with QSFP28 ports
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