Would this work for optimum 300mbps plan?

Check with the ISP but it should if they support DOCSIS 3.0. Max throughput this modem can handle is 400Mbps.

This ethernet cable is suitable for it: https://www.amazon.com/gp/product/b06xhdt44g

That's a long cable, and I'd recommend a much shorter connection to a router, but it will work.

do I need a router or just a switch will work for Ethernet connections to other computers?

You need a router unless your provider can can give you more IP addresses. Typically, you want to use a router both to allow multiple systems to connect, and to provide added security, since most routers provide firewall functionality.

Does this product have a phone jack?

Cable and power in. Ethernet our. Nothing more

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NETGEAR Cable Modem DOCSIS 3.0 (CM500) Compatible with Major Cable Providers Including Xfinity, Cox, for Plans Up to 400 Mbps

Product ID: 42650296

Details

Brand
NETGEAR
Color
Black or White
Compatible Devices
Personal
Connectivity Technology
Wired
Internet service provider
Xfiniti Cox

⚡16x4 channel bonding for blazing speeds

💸Save up to $168/year on rental fees

📶DOCSIS 3.0 tech for ultra-reliable connectivity

NZ$181

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Upgrade your internet game — speed, savings, and seamless streaming!

RENTAL FEE FREEDOM - Eliminate monthly modem rental fees and save big annually.
BLAZING FAST SPEEDS - Supports up to 680 Mbps to keep your workflow seamless and buffer-free.
GIGABIT ETHERNET PORT - Single port delivers stable, high-speed wired connections for your devices.
UNIVERSAL ROUTER FRIENDLY - Works effortlessly with any WiFi router to power your entire smart home.
CARRIER APPROVED COMPATIBILITY - Certified for major providers like Xfinity & Cox, ensuring plug-and-play ease.

The NETGEAR CM500 DOCSIS 3.0 Cable Modem delivers high-speed internet up to 680 Mbps with 16x4 channel bonding technology. Compatible with major U.S. cable providers like Xfinity and Cox, it supports plans up to 400 Mbps and helps you save up to $168 annually by replacing rental equipment. Featuring a gigabit Ethernet port, it pairs with any WiFi router to power your home network with reliable, fast connectivity.

Specifications

Asin	B06XH46MWW
Best Sellers Rank	#633 in Computers & Accessories (See Top 100 in Computers & Accessories) #8 in Computer Networking Modems
Brand	NETGEAR
Built In Media	Ethernet cable, High Speed Cable Modem—DOCSIS 3.0 (CM500), Power adapter, Quick install guide
Color	Black or White
Compatible Devices	Personal Computer
Connectivity Technology	Wired
Customer Reviews	4.2 4.2 out of 5 stars (14,789) 4.2 out of 5 stars
Data Transfer Rate	680 Megabits Per Second
Global Trade Identification Number	00606449127898
Internet Service Provider	Xfiniti, Cox
Item Type Name	Netgear CM500-1AZNAS (16x4) DOCSIS 3.0 Cable Modem, Max download speeds of 680Mbps, Certified for XFINITY
Item Weight	1.5 Pounds
Manufacturer	Netgear
Maximum Downstream Data Transfer Rate	343 Megabits Per Second
Maximum Upstream Data Transfer Rate	123 Megabits Per Second
Mfr Part Number	CM500-1AZNAS
Model Number	CM500-1AZNAS
Modem Type	Cable
Number Of Ethernet Ports	1
Number Of Ports	8
Unit Count	1.0 Count
Upc	606449127898
Warranty Description	1 Year Warranty

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NZ$181

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to New Zealand.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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