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Cisco

Cisco SFP-50G-CU4M | 50G DAC | SFP56 50GBASE-CR, Passive Twinax, 4m | SFP56–SFP56

SKU:SFP-50G-CU4M

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Description

Four-meter 50GbE SFP56 direct-attach copper cable for short- to medium-reach, low-latency data center links. Passive twinax design reduces power and complexity while maintaining robust 50GBASE-CR signal integrity. Ideal for top-of-rack to adjacent-rack connectivity.

Features

- 50G SFP56-to-SFP56 short- to mid-reach connectivity
- Passive design for low power and low latency
- Secure latching SFP56 ends
- Robust twinax shielding
- Compliant with IEEE 802.3cd 50GBASE-CR

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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FAQs

Technical Specifications

FAQs

Q: What equipment is this cable compatible with?
A: Devices must support 50G SFP56 DACs. Vendor coding often must match the switch/NIC; verify compatibility with your platform.

Q: Is this passive or active?
A: Passive twinax; it relies on the host PHY and adds virtually no latency.

Q: Can it be used for 25G operation?
A: Not guaranteed. It is intended for 50G SFP56 ports; any downspeeding depends on the platform.

Q: Is there a maximum recommended bend radius?
A: Yes—about 10× the cable diameter. Avoid sharp bends to maintain signal integrity.

Q: Does it require special drivers or licenses?
A: No. It functions as a standards-based DAC when used in supported SFP56 50G ports.

Technical Specifications

- Data rate: 50 GbE (PAM4)
- Standard: IEEE 802.3cd 50GBASE-CR
- Form factor: SFP56 on both ends
- Cable type: Passive twinax DAC
- Length: 4 m
- Power: ~0.1 W (passive, host-powered)
- Latency: Ultra-low (no DSP)
- Operating temperature: 0 to 70 °C (standard)
- Hot-swappable: Yes
- Compliance: RoHS

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