The Cisco PA-MC-8TE1+ is a single-wide port adapter designed to provide a full eight port PRI multichannel solution for the Cisco 7200 and Cisco 7400. The interfaces can be channelized, fractional or ISDN-PRI, or unframed (E1) with up to 256 independent HDLC channels definable for T1 and E1 applications. For network administrators who require the higher performance provided by a PRI ISDN connection, the Cisco 8TE1+ provides one of the greatest densities currently offered in the industry at eight PRI ports per card, up to 48 ports per Cisco 7200 system, up to 672 ports per seven-foot rack, or up to 432 ports per rack using the Cisco 7200 Rack Density System (RDS) for front-to-back airflow. The RJ-48c ports are software-configurable to support T1 or E1 (120 Ohm) interfaces. In T1 mode, each port can support up to 23 B-channels, for an aggregate data rate of 1.536 Mbps per port. When configured to operate in channelized mode, all 24 channels are an aggregate data rate of 1.984 Mbps per port. When configured to operate in channelized mode, up to 31 channels are available per port.