An Internet service provider is also called as internet access provider (IAP) is a company that offers its customers to access internet. The ISP Connects to its customers using a data transmission technology appropriate for delivering internet protocol datagram’s such as Dial up , DSL Cable Modem , Wireless or dedicated high-speed interconnects
ISPs may provide internet email accounts to users which allow them to communicate with one another by sending and receiving electronic messages through their ISP’s Servers
ISP’s employ an range of technologies to enable customers to connect to their network
For users and small business the most popular options include dial-up, DSL typically Asymmetric Digital Subscriber line, Broadband Wireless ,cable modems Fiber to the premises (FTTH) and Integrated Services Digital Network ( ISDN ) typically basic rate interface
For customers with more demanding such as medium to large business or other ISP’s DSL, Ethernet Metro Ethernet gigabit Ethernet frame relay ISDN (BRI or PRI ) , ATM Satellite internet access and synchronous optical networking ( SONET ). & more likely to be used.
TYPICAL HOME USER CONNECTION
Dial-up
DSL
Broadband wireless
Cable Internet
FTTH
ISDN
Wi-Fi
TYPICAL BUSINESS TYPE CONNECTION
DSL
SHDSL
Ethernet Technologies