List of Figures

Figure 1: Interface Slot, PIC, and Port Locations

Figure 2: Clock Sources

Figure 3: Location of an LOS or LOF Alarm in a T1 Network

Figure 4: Location of an AIS Alarm in a T1 Network

Figure 5: Location of a Yellow Alarm in a T1 Network

Figure 6: Location of an LOS or LOF Alarm in a T3 Network

Figure 7: Location of an AIS Alarm in a T3 Network

Figure 8: Location of a Yellow Alarm in a T3 Network

Figure 9: Local Loopback

Figure 10: Loop from the Router to the Network

Figure 11: Example of a SONET Network

Figure 12: Example of an Upstream or Downstream Failure

Figure 13: Another Example of an Upstream or Downstream Failure

Figure 14: Location of an LOS Alarm in a SONET Network

Figure 15: Example of a Router Receiving Only an AIS-P Alarm

Figure 16: Example of a Router Receiving Both an AIS-L and an AIS-P Alarm

Figure 17: Example of a Router Receiving Only an RDI-P Alarm

Figure 18: Example of a Router Receiving Both an RDI-L and RDI-P Alarm

Figure 19: Example of a Router Receiving Only an REI-P Counter Incrementing

Figure 20: Example of a Router Receiving Both An REI-L and REI-P Counter Incrementing

Figure 21: RJ-45 Ethernet Loopback Plug

Figure 22: Sample Configuration of Channelized OC12 IQ Interface

Figure 23: Controller Interfaces at Different Levels of Channelization

Figure 24: Specific Channels of a Channelized OC12 IQ Interface