How to troubleshoot service failure after timeslot cross-connection configuration?

After time slot cross-connection configuration is completed, if services are not working, first confirm that the cross-connection configuration has been correctly delivered and takes effect, and check the status of the working main control unit and whether the standby main control is ready. Then check whether the E1 cables and connectors are secure and whether the transmit and receive pairs are reversed, and confirm that the line code type and frame structure at the local and remote ends are consistent: the IDM DXC5200 uses HDB3 code type and PCM30/32 frame structure, and the remote device must be interconnected in accordance with the ITU-T G.703 standard. Next, verify interface impedance matching, where 75Ω coaxial and 120Ω balanced must be consistent with the remote end and the cable. If a single service is not working, separately verify the source and sink directions of that service's time slot in the cross-connection configuration; if the issue persists, it is recommended to contact the manufacturer's technical support based on device alarms.