Modems transmit bits, which are essentially 0s and 1s. In the OSI Reference Model, the modem is considered a Layer 1 device. Each type of modem is capable of transferring data over a different type of physical connection using a set of communications standards, or protocols, that it was designed to support. For example, a DSL modem is capable of transferring data over a standard copper telephone line, a cable modem is capable of transferring data over a coax cable line, a fiber modem is capable of transferring data over a fiber optic line, a satellite modem is capable of transferring data over a satellite connection, and well, you get the gist. Now you may ask, why is this necessary? Well, the reason why we need modems is because unlike a router or a switch, different types of modems can transmit and receive data on different types of physical connections. The primary purpose of a modem when used in a home networking environment is to establish a connection between your home internet connection and your ISP. What is a Modem?Ī modem is the short way of saying “modulator, demodulator”. If the chart above seems a little confusing, this is understandable, so let’s dive a little more in depth into each device and discuss how it relates to each layer of the OSI Reference Model. Below is an overview of what each layer is called and what type of data is carried in the layer. In total there are 7 layers in the OSI Reference Model. This is why a router made by Cisco will work with a switch made by Netgear, and the switch made by Netgear will work with a Wi-Fi access point made by TP-Link. As modems, routers and switches are network devices, they fall under the OSI Reference Model.
MODEM VS ROUTER VS SWITCH ISO
The OSI Reference Model is a framework originally developed in 1984 by the ISO (International Organization of Standardization) that essentially governs how information is communicated through a network. Before we start with the modem vs router vs switch conversation, we first need to understand the OSI Reference Model, or Open Systems Interconnection Reference Model.
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