| low-speed line card Card on the LightStream 2020 ATM switch that can be configured as an edge or a trunk card. An LSC, in conjunction with an access card, supports eight trunk or edge ports (Frame Relay or frame forwarding) at individual port speeds up to 3.584 Mbps, or an aggregate rate of 6 Mbps per line card. See also edge card, MSC, and trunk card. |