Wireless cable modem connects clients in your wireless network to the internet through the cable. It is a combination of a cable modem and wireless router so you also find the name cable modem wireless router.

The Wireless Cable Modem Overview

wireless cable modem

wireless cable modem

Connection to the internet is established with the coaxial cable. Coax cable is the same kind of cable which has been used for connecting your television with the antenna.

If you are interested about the wireless router, read broadband wireless router.

The Basic Functions of the Wireless Cable Modem

The cable modem wireless router has seven basic functions:

  1. DHCP server
  2. NAT
  3. Firewall
  4. Access point
  5. Ethernet Switch
  6. QoS

DHCP – Dynamic Host Configuration Protocol Server

The DHCP server assigns a private address to the clients in your network – both wired and wireless. You don’t need to bother with setting up the static IP address. As soon as the client connects to the network it gets the IP address which is initially configured on the wireless cable modem. This range of IP address can be changed on the cable modem wireless router.

NAT – Network Address Translation

The NAT hides the private IP addresses of your clients to one public IP address. Private IP addresses are assigned by the DHCP server. Internet service provider – ISP gives you the public IP address to the cable modem wireless router. Usually this IP address is not static, but dynamic –assigned by the ISP’s DHCP server.

NAT is also a kind of the security mechanism because all your clients are not directly exposed to the internet. All the clients on the local wireless and wired network are seen only as one IP address on the internet. This IP address is a public IP address of the cable modem.


A firewall is a security mechanism that protects your local network. You can specify on the wireless cable modem what you will allow to pass from internet toward the local network.

Access Point

The access point is a wireless switch which enables connection of the wireless clients to the WiFi network. The access point can support many generations of WiFi signals – a, b, g, n, ac.

More about the WiFi you can read on what does WiFi stand for. If you are interested to learn about all WiFi generations, read what does WLAN stand for.

Ethernet Switch

The Ethernet switch connects all the computers, connected to the Ethernet ports of the device, in the local wired network. The cable modem wireless router usually has up to four Ethernet ports.
Local wireless network and wired network are connected. But there is an option to disable traffic between the wireless and wired clients.

QoS – Quality of Service

With the QoS you can prioritize some types of traffic. If you have congestion in the network, usually towards the internet link, the wireless cable modem will start to drop the packets. With the QoS you can choose which kind of traffic will be dropped, and which will have the biggest priority.

A great example of the QoS would be the following. You have someone in your home who is using peer-to-peer downloads and is taking the most of your internet link. Enable the QoS and put the lowest priority for the peer-to-peer traffic. After that, you will be able to watch the video clips from the YouTube.

Connection and Setup of the Cable Modem Wireless Router

If you take time and look at this video, you can learn the following:

  • How to connect all the cables to the device
  • How to connect the computer to the device with the Ethernet cable to the wired network
  • How to setup and connect the device to the internet
  • How to reach the internet from the wired connection

In the video below find out how to establish the wireless connection:

Very important is to setup the proper wireless security. My advice is that you read wireless internet security and go through all five steps and configure the maximum security in your wireless network.

If you have any questions or comment about the wireless cable modem, be free to leave the comment.

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