ISDN Lines (Integrated Services Digital Network) is a set of standards for digital transmission of data over standard copper telephone lines. provides faster transfer rates than dial-up telephone lines. can carry three or more signals at once through the same line , using the technique called multiplexing.
DSL lines (Digital Subscriber Line) transmits at fast speeds on existing standard copper telephone wiring. may not be an option for rural residents because the user's location and the telephone company’s DSL modem must be located within 3.5 miles of each other . popular types of DSL is the ADSL (Asymmetric Digital Subscriber Line).
ADSL(Asymmetric Digital Subscriber Line) is a type of DSL that supports faster transfer rates when receiving data than when sending data.
FTTH and FTTB Lines FTTH(Fiber to the Home) uses fiber-optic cable to provide extremely high –speed Internet access to home users. FTTB(Fiber to the Building ) refers to small businesses that use fiber-optic cables to access the internet.
T-Carrier Lines is any of several types of long-distance digital telephone lines that carry multiple signals over a single communications line.
Types of T-carrier Lines T1 line- refers to a specific type of copper or fiber optic telephone line that can carry more data than the traditional telephone lines . Fractional T1 line- allows a customer to use only a certain number of the 24 channels on a T1 line. T3 line- is equal in speed to 28 T1 lines, and is used by larger businesses with higher data and voice demands.
ATM(Asynchronous Transfer Mode) is a service that carries voice, data, video, and multimedia at very high speeds.
Dial-Up Modems is a type of modem used to connect a personal computer to the internet. usually it is in the form of an adapter card that you insert in an expansion slot on a computer’s motherboard. it is sometimes called modem.
ISDN Modems Digital modem- is a modem that sends and receives data and information to and from a digital telephone line such as IDSN and DSL. IDSN modems- sends digital data and information from a computer to an ISDN line and receives data and information from an IDSN line.
DSL Modem DSL modems- sends digital data and information from a computer to a DSL line and receives digital data and information from a DSL line.
Cable Modems sometimes called broadband modem. Is a digital modem that sends and receives digital data over the cable television(CATV) network.
Wireless Modems allows access to the web wirelessly from a notebook computer, a PDA, a smart phone, or any mobile devices.
Network Cards enables the computer or device that does not have built-in networking capability to access a network. coordinates transmission and receipt of data, instructions, and information to and from computer or device.
Bandwidth Is the amount of data , instructions, or information that can travel over a communication channel. Latency Is the time it takes a signal to travel from one location to another on a network.
Transmission Media Consist of materials or substances capable of carrying one or more signal. Baseband Media Transmits only one signal. Broadband Media Transmit multiple signals simultaneously.
Types of Transmission Media Physical Transmission Media Wireless Transmission Media
Physical Transmission Media used in communications include twisted- pair cable, coaxial cable, and fiber- optic cable.