A Brief History and Explanation of Modems

Modems (modulation and demodulation) are network devices that modulate and demodulate analog carrier signals (called sine waves) for encoding and decoding digital information for processing (Janssen C 2014). The most common use of a modem is to send and receive digital information between personal computers and connect to the Internet. Modems are considered to be important hardware for computers, but most computers built in modems, but because of the growing popularity of broadband connectivity, it is today embedded in many manufacturers not.

In recent years, this term has become synonymous with cable modem. The cable modem or fiber modem is at the forefront of the modem currently in use. Most modems provided by ISP today also have port forwarding / triggering capability. This all-in-one function bundle is part of the appeal of these devices. There is no need to prepare another WAP, DHCP server, or modem anymore. Depending on the modem itself, there are fully configurable routers and firewalls. The trend is to concentrate all services on one connection. (Show router access point.jpg) Many readers already use this equipment at home or are already using it. Cisco and Linksys

Compare and contrast architecture devices and functions: CompTIA A + 220-901 Subtarget 2.8

Research on cable modem history took 15 years, then showed that cable modem became mainstream. There are three major problems facing the long-term development of cable modems. The first problem is the transmission of bidirectional traffic. A cable television network can transmit information from the operator's office to the customer's home, but can not transfer information from the customer to the operator's office. Until the end of 1990, cable operators were able to transmit information bi-directionally

How does a cable modem work? Cable modem operation has five major components. Head end, trunk cable, nearby distribution cable, drop cable to home and indoor wiring, and terminal equipment. This is a really fairly simple process. Cable modem networks are described as "tree and branch" networks. This means that there is a main station (headend) with a trunk cable that can be used to distribute the feeder cable to all the blocks. These feeder cables are branched into drop cables, and are introduced to individual houses before being connected to terminal equipment.