Gateway

There are many types of gateways. One definition of a gateway is a computer system or other device that acts as a translator between two systems that do not use the same communication protocols, data-formatting structures, languages, and/or architecture. Another definition of a gateway is a router, which is a network layer gateway. In the early days of the Internet, routers were called “gateways.” These devices provided links, initially between mainframe computers, and then later between LANs and other networks. The term “router” is more common now, but gateway is still used when configuring the IP protocol for host devices.

Gigabit Ethernet

Gigabit Ethernet is a 1-gigabit/sec (1,000-Mbit/sec) extension of the IEEE 802.3 Ethernet networking standard. Its primary niches are corporate LANs, campus networks, and service provider networks where it can be used to tie together existing 10-Mbit/sec and 100-Mbit/sec Ethernet networks. Gigabit Ethernet can replace 100-Mbit/sec FDDI (Fiber Distributed Data Interface) and Fast Ethernet backbones, and it competes with ATM (Asynchronous Transfer Mode) as a core networking technology. Many ISPs use Gigabit Ethernet in their data centers. 

GPRS (General Packet Radio Service)

GPRS is a technology for transmitting data over a GSM (Global System for Mobile communications) wireless network. It uses packet switching and supports IP. GPRS is a 3G(third-generation) cellular technology and was implemented in 1999 and 2000. Data rates are at least twice that of the fastest telephone modem.     

GSM (Global System for Mobile Communications)

See Wireless Mobile Communications.