3Com 3C63311 Reference Guide - Page 189

Managing System Alarms 177 Table 29 DSX-1/E1 CBR Module Alarms (continued) Transmit FIFO Overflow VC RDI Receive The cell bus is congested, and The entire CBR connection must be cells are backed up on the CBR. synchronous end-to-end. Make sure Traffic at the output side of the CBR port is being transmitted more slowly than it is being received from the cell bus. As a result, the output buffer is the clock rates of the devices at either end of the connection match each other and match the transmit clock rate of the CBR ports on the PathBuilder device. overflowing. In general, the problem is that the CBR connection is not synchronized end-to-end. The clock rate of the output port does not match the clock rate of the device from which the traffic originated. VC RDI (Remote Defect Check for a defective cable between Indication) OAM received in the far end interface port and your the connection. The far end service provider's network interface equipment has a problem with unit. An open transmit line can cause the signal it is receiving, this condition. indicating that the problem lies between the network provider and the far end terminal equipment for this connection. SIM Alarms Table 30 describes the alarms specific to QSIMs and FAMs Table 30 QSIM Alarms Alarm LMI Link Down Meaning The Local Management Interface has taken the link down. Troubleshooting Steps Check the LMI protocol configuration for the port. Voice Compression Module Alarms Table 29 describes the major alarms specific to the Voice Compression module. . Table 31 Voice Compression Module Alarms Alarm Meaning Troubleshooting Steps E1 Loss of CAS Multiframe E1 signaling multiframe alignment has been lost. Check the physical connection and the carrier for configuration problems. E1 Time Channel 16 All 1s in E1 time slot 16 for 2 AIS Rcv consecutive frames. Make sure both the local device and the far end device are configured for Time Slot 16 framing. If both devices are correctly configured, there may be a hardware problem in either device. Far End E1 Loss of The far end device has lost Check the E1 configuration of the far CAS Channel Associated signaling. end device. Channel PCM Loopback Condition A loopback is configured on the channel. Loopbacks are for troubleshooting only and should not be present during normal operating conditions. If you are not troubleshooting the channel, turn off the loopback.