The Motorola SURFboard SB-5101U cable modem is a proven and widely adopted solution for residential broadband connectivity over cable networks. Designed with DOCSIS 2.0 and Euro-DOCSIS 2.0 certification, it ensures compatibility with a wide range of service providers around the world. This model delivers download speeds of up to 38 Mbps and upload speeds of up to 30 Mbps, which was considered cutting-edge at its launch and still provides sufficient bandwidth for light to medium home internet use, such as browsing, standard-definition streaming, VoIP, and online gaming.
One of the standout features of the SB-5101U is its dual connectivity interface: it includes both a 10/100Base-T Ethernet port (RJ-45) for seamless integration with modern routers and PCs, as well as a USB port that adds flexibility for legacy systems. This makes the modem a flexible choice for users transitioning between different hardware generations.
The SB-5101U is also backwards compatible with DOCSIS 1.0 and 1.1 standards, allowing it to work in networks that have not fully upgraded to DOCSIS 2.0. Additionally, it offers IPv6 support, ensuring forward compatibility with next-generation internet addressing.
Its compact and durable design, along with LED indicators (Power, Receive, Send, Online, PC/Activity), allows users and technicians to easily monitor network and device status. Certified as RoHS compliant, it also meets environmental standards. This modem is ideal for customers who need a reliable, easy-to-deploy broadband solution at an affordable cost, particularly for homes or small offices that do not require DOCSIS 3.0 or higher speeds.
Key Features & Benefits
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DOCSIS 2.0 (and Euro-DOCSIS 2.0) standard: improved upstream capacity over DOCSIS 1.0 / 1.1.
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Downstream up to ~38 Mbps; upstream up to ~30 Mbps.
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Dual interface: 10/100Base-T Ethernet (RJ-45) plus USB connection.
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Supports IPv6.
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LED indicators: Power, Receive, Send, Online, PC/Activity to help with status monitoring.
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Compact design, RoHS compliant.
Technical Specifications
| Specification | Detail |
|---|---|
| Model / Part Number | Motorola SB-5101U |
| Standards | DOCSIS 2.0 / Euro-DOCSIS 2.0; backward compatible with DOCSIS 1.0 / 1.1 |
| Downstream Data Rate | ≈ 38 Mbps max |
| Upstream Data Rate | ≈ 30 Mbps max |
| Ethernet Interface | 10/100Base-T RJ-45 |
| USB Interface | USB High Speed (used for devices supporting it) |
| IPv6 Support | Yes |
| LED Indicators | Power, Receive, Send, Online, PC/Activity |
| Dimensions (HxWxD) | ≈ 6.2 × 2.3 × 6.0 in (≈ 15.75 × 5.84 × 15.24 cm) :contentReference[oaicite:7]{index=7} |
| Certifications / Compliance | RoHS; DOCSIS / Euro-DOCSIS; FCC / relevant cable modem standards :contentReference[oaicite:8]{index=8} |
| Typical Use Case | Home broadband; single or few users; basic internet, streaming (lower resolutions), browsing |
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