A modem connects to your ISP, to provide either cable or DSL Internet service.
Cable modems have a coaxial connection, which is the same type of connector found on a TV or cable box. This connects to a cable port on the wall.
DSL modems have a telephone connector, also called an RJ-11 jack, which connects to a telephone socket on the wall.
Many Internet Service Providers will use a combination modem and router. A combination modem/router will have LAN Ethernet ports for your computers and either a DSL or coaxial cable connection to the wall. It may also include Wi-Fi functionality.
To identify the make and model of the device, the simplest and most reliable approach is to locate a sticker or label somewhere on the device. You may find this on the back or bottom of the device, as illustrated in the images below.
While others may display the model number clearly on the front of the device, as in the image below.
If you are trying to identify your modem and router, and you are unsure if you've located the correct information, you may choose to take pictures of the device and consult with your PCS VoIP technical support representative.