VCI

Stands for "Virtual Channel Identifier." VCI is a key component in ATM (Asynchronous Transfer Mode) networks. It works alongside the VPI (Virtual Path Identifier) to determine the route an ATM cell takes through a network.

Unlike TCP/IP, which dynamically routes packets, ATM transmits data over fixed virtual channels, making it easier to manage and track data flow. Each ATM cell contains a 16-bit VCI field, which identifies the specific virtual channel it belongs to. The VCI ensures that data packets remain organized and do not interfere with other transmissions on the network.

About ATM Networking

ATM was developed as a high-speed data transfer technology, primarily used by Internet Service Providers (ISPs) and telecom networks. While ATM has largely been replaced by Ethernet and IP-based networking, its principles still influence modern WANs, especially in Quality of Service (QoS) and traffic management.