The 24 channelized E1 trunk card has three E1 interfaces and each interface supports eight E1 PRI ports. Each 24 channelized E1 trunk card can be installed in Cisco AS5850 server slots 0 to 5 or 8 to 13. The 24 channelized 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.