Cisco 8 Port E1/PRI 120 Ohm Port Adapter PA-MC-8E1Cisco PA MC 8E1 8 Port E1 PRI 120 Ohm Port Adapter Description: Cisco Multichannel E1 Port Adapter eliminates the need for separate interface types for separate connection requirements. At a cost per E1 port less than that of a standard serial port with external CSU DSU, This multichannel interface is cost effective for all WAN connectivity. This card provides high port density at a reduced cost per port. For E1 applications, the multichannel E1 G.