How does Frame Relay speed compare with ISDN and ATM?

Frame Relay is designed for high-speed data transmission and typically operates at speeds that can exceed those of ISDN, making it a more efficient choice for many organizations. While ISDN provides data speeds of up to 128 Kbps with standard connections, Frame Relay can support much higher bandwidths, often in the range of 56 Kbps to several Mbps, depending on the service provider and the configuration.

On the other hand, ATM, designed for both voice and data traffic, can achieve significantly higher speeds, often starting at 155 Mbps and scaling up to 622 Mbps or more with the use of OC-3 or higher connections. This technology is geared toward environments where ultra-high speeds and Quality of Service (QoS) are critical.

Thus, while Frame Relay offers faster speeds compared to ISDN, it does not reach the higher performance levels that ATM provides. This distinction makes Frame Relay a suitable option for scenarios requiring reliable and relatively fast data transmission but may not be appropriate for applications demanding greater speed and flexibility that ATM offers.