The multichannel E1/PRI port adapter integrates data service unit (DSU) functionality and E1 channel support into the Cisco router. The PA-MC-2E1 port adapter provides two independent E1 (120-ohm) connections via RJ-48C connectors.This port adapter is designed for the following systems:Catalyst 5000 Family Switches with RSM/VIP2;Catalyst 6000 Family Switches with Catalyst 6000 Family FlexWAN Module;Cisco 7100 Series;Cisco 7200 Series;Cisco uBR7200 Series;VIP2 and VIP4 in the Cisco 7000 Series and Cisco 7500 Series.