Modem VS Router – Most people not really understand the differences between modem and router as they both provide internet access to the users, let see what are the differences.
Modems are derived from the abbreviation Modulator Demodulator. Modulator is the part that converts the information signal into a carrier signal and is ready to be sent, while the Demodulator is the part that separates the information signal (which contains data or messages) from the received signal so that the information can be received well. Modem is a combination of both, meaning that the modem is a two-way communication tool. Each two-way long distance communication device generally uses parts called “modems”, such as VSAT, Microwave Radio, etc., but generally the term modem is better known as Hardware which is often used for communication on computers.
Data from a computer in the form of a digital signal is given to the modem to be converted into an analog signal, when the modem receives data from outside in the form of an analog signal, the modem converts it back to a digital signal so that it can be further processed by the computer. The analog signal can be sent through several telecommunications media such as telephone and radio.
Upon arrival at the destination modem, the analog signal is converted into a digital signal again and sent to the computer. There are two types of physical modems, namely external modems and internal modems.
Analog modem is a modem that makes analog signals into digital signals
Modem ADSL (Asymetric Digital Subscribe Line) technology that allows internet surfing and using analog phones simultaneously. The way is very easy, for ADSL is given a tool called a splitter or divider line. The Splitter position is placed at the front when the telephone line is entered. That is, it is not recommended to branch out the line modem for ADSL by voice directly. The Splitter tool is useful for removing interference when using an ADSL modem. With Splitter both can run simultaneously, so users can answer and call someone with a normal telephone. On the other hand, users can still be connected to the internet through an ADSL modem.
Cable modem is a modem that receives data directly from a service provider via Cable TV
CDMA modem is a modem that uses a frequency of 800 MHz CDMA or 1x CDMA. And the most recent use EVDO Rev-A frequency (equivalent to 3G) and the latest CDMA technology is EVDO Rev-B.
Satellite Modem is a modem that communicates with the ISP and with the help of a satellite that connects satellite terminals connected to the modem
The router functions as a liaison of 2 or more networks to forward data from one network to another. A router is different from a switch. Switch is a link between several devices to form a Local Area Network (LAN). As an illustration of the different functions of routers and switches, a switch is a way, while a router is a liaison between roads. Each house is on a street that has an address in a certain order. In the same way, switches connect various devices, where each device has its own IP address on a LAN.
Routers are widely used in networks based on TCP / IP protocol technology, and routers of this type are also called IP Routers. In addition to the IP Router, there is another AppleTalk Router, and there are still several other types of routers. The internet is a prime example of a network that has many IP routers. Routers can be used to connect many small networks to a larger network, called an internetwork, or to divide a large network into several subnetworks to improve performance and also simplify management. Routers are also sometimes used to connect two networks that use different media (such as a wireless router that in general, in addition to being able to connect computers using radios, it also supports connecting computers with UTP cables), or different network architectures, such as from Ethernet to the Token Ring.
Routers can also be used to connect LANs to a telecommunications service such as leased lines or Digital Subscriber Line (DSL) telecommunications. The router used to connect LANs to a leased line connection such as T1, or T3, is often referred to as an access server. Meanwhile, the router used to connect a local network to a DSL connection is also called a DSL router. These types of routers generally have a firewall function to filter packets based on the source address and destination address of the packet, although some routers do not have one. A router that has a packet filtering feature is also called a packet filtering router. Routers generally block data traffic that is broadcasted so that it can prevent a broadcast storm that can slow down network performance.
In general, routers are divided into two types, namely:
static router: is a router that has a static routing table that is set manually by network administrators.
dynamic router: is a router that has and creates dynamic routing tables, by listening to network traffic and also by connecting with other routers.