The 24 channnelized T1/E1 trunk card has three T1/E1 interfaces and each interface supports eight T1/E1 PRI ports. Each 24 channelized T1/E1 trunk card can be installed in Cisco AS5850 server slots 0 to 5 or 8 to 13. The 24 channelized T1/E1 trunk card contains all necessary functionality to terminate as many as 576 DS0 channels in T1 mode and 720 DS0 channels in E1 mode and uses onboard High-Level Data Link Control (HDLC) controllers to terminate digital ISDN calls. You can use the Bantam jacks on the face of the card to monitor a line.