This tutorial covers everything one like to know about networking basics including circuit switching vs packet switching, TCP/IP protocol fields, ARP/RARP protocol fields, what is IP address ,what is MAC address, networking devices which include hub, switch, bridge, router, gateway and firewall. This page describes networking gateway with example.
From networking point of view Gateway is a device which provides connectivity bewteen two heterogeneous networks/systems to communicate. This is done using protocol translation. Gateway embeds both protocols of different systems in order to provide interoperability functions. Gateway can provide interconnectivity between more than two different systems also.
There are various gateway designed as per the need of different systems/technologies. These include GSM/CDMA gateway for VOIP, T1(1.544Mbps)/E1(2.048Mbps) gateway, access gateway, GMSC and more.
Following figure explains Gateway in GSM network.
As shown GSM gateway provides connectivity with PSTN,ISDN through EPABX/PBX and also to other wireless networks such as CDMA,HSPA etc.
As mentioned all the landline phones both with and without VOIP functinalities are connected with EPABX/PBX. Gateway sunctionalities are also designed to interface GSM and CDMA networks and other wireless standards viz. wlan,wimax etc.
Circuit Switching vs Packet switching
LAN vs WAN vs MAN
What is an IP address
What is MAC Address
Basics of OSI and TCP-IP Layers
What is Hub
What is Switch
What is Bridge
What is Router
What is Gateway
TCP-IP Packet format
ARP Protocol format