# DOCSIS 3.0 High Sp Cable Modem

> DOCSIS 3.0 High Sp Cable Modem summary. NETGEAR CM400 is a DOCSIS 3.0 cable modem with 8x4 channel bonding, delivering up to 340 Mbps. Ideal for cutting rental fees with US providers like Comcast, Spectrum, and Cox.

Tags: modem, netgear, cm400, docsis-3.0, cable-modem
Source: https://www.amazon.co.jp/dp/B00MN2EUEA
Article page: https://web-autoai.com/articles/docsis-30-high-sp-cable-modem?lang=en

Prices and ratings change over time — check the article page for the current values.

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This article covers DOCSIS 3.0 High Sp Cable Modem.

## Overview
The NETGEAR CM400 is a DOCSIS 3.0 cable modem designed to eliminate monthly rental fees while delivering reliable internet connectivity. It supports up to 340 Mbps download speeds using 8x4 channel bonding (8 downstream, 4 upstream), making it suitable for HD streaming, online gaming, and general browsing.
This modem is compatible with major US cable providers such as Comcast Xfinity, Spectrum, and Cox. It does not include Wi-Fi, so you'll need a separate router for wireless devices. Check the retailer's page for the latest price.

## Connectivity & Compatibility
The CM400 offers one Gigabit Ethernet port for wired connections. It is DOCSIS 3.0 certified, which is backward compatible with DOCSIS 2.0/1.1 networks. However, it does not support voice services (VoIP). Before purchasing, verify that your cable provider allows customer-owned modems and that the modem's MAC address can be registered on their network.
Note: This modem is designed primarily for North American cable systems. Compatibility with Japanese cable TV services (e. g. , J:COM) is not guaranteed. Check with your local provider for supported modem models.

## Product Info
The NETGEAR CM400 was released around 2015 and is positioned as an entry-level to mid-range cable modem. The package includes the modem, an Ethernet cable, and a power adapter. The standard warranty is one year.
Market positioning: This is a DOCSIS 3.0 modem optimized for internet plans up to 340 Mbps. For gigabit plans, you'll need a DOCSIS 3.1 modem. The CM400 is a solid choice for budget-conscious users who don't need the latest speeds.

## Best Use Cases
* Users who already have a Wi-Fi router: Since the CM400 is a pure modem (no routing, no Wi-Fi), it's perfect for those who want to keep their existing router setup.
* Budget or light internet users: For plans under 340 Mbps, the CM400 delivers sufficient performance for streaming, email, and social media. Not recommended for heavy gamers or 4K streaming households that need >500 Mbps.
* Not suitable for: Users with gigabit internet plans, those needing voice service, or anyone using a Japanese cable provider that doesn't support DOCSIS 3.0 modems.

### Product Disclosure (Amazon)
- Manufacturer: NETGEAR
- Seller: Amazon US
- Fulfilled by: Amazon US
- ASIN: B00MN2EUEA
- Note: This article covers a manufacturer-made product based on Amazon listing details.