Internet Router Hardware Guide

List of Figures
Figure 1: Front of Chassis ........................................................................ 8
Figure 2: Rear of Chassis with Component Cover in Place ..................................... 9
Figure 3: Rear of Chassis with Component Cover Removed .................................. 10
Figure 4: Midplane............................................................................... 13
Figure 5: Front of Chassis with Four-PIC FPC Installed in Slot FPC0.......................... 15
Figure 6: FPC1 and FPC2........................................................................ 18
Figure 7: Packet Forwarding Engine Clock Generator.......................................... 19
Figure 8: Switching and Forwarding Module ................................................... 21
Figure 9: Routing Engine........................................................................ 25
Figure 10: Miscellaneous Control Subsystem................................................... 27
Figure 11: Craft Interface........................................................................ 28
Figure 12: LCD in Idle Mode .................................................................... 30
Figure 13: LCD in Alarm Mode.................................................................. 30
Figure 14: Connector Interface Panel........................................................... 33
Figure 15: Routing Engine Interface Ports for Host Module 0 ................................ 34
Figure 16: Alarm Relay Contacts and BITS Input Ports ........................................ 35
Figure 17: Original Power Supply............................................................... 37
Figure 18: Enhanced Power Supply............................................................. 37
Figure 19: Circuit Breaker Box .................................................................. 39
Figure 20: Airflow through the Chassis......................................................... 41
Figure 21: Cable Management System ......................................................... 41
Figure 22: System Architecture ................................................................. 51
Figure 23: Packet Forwarding Engine Components and Data Flow........................... 53
Figure 24: Routing Engine Architecture ........................................................ 54
Figure 25: Control Packet Handling for Routing and Forwarding Table Updates ............. 55
Figure 26: Typical Center-Mount Rack.......................................................... 61
Figure 27: Chassis Dimensions and Clearance Requirements................................. 62
Figure 28: Power and Grounding Cable Lug.................................................... 67
Figure 29: Typical Source Cabling to the Router ............................................... 68
Figure 30: Power and Grounding Cable Connections.......................................... 70
Figure 31: Unpacking the Router ............................................................... 79
Figure 32: Removing a Power Supply .......................................................... 86
Figure 33: Removing an SFM ................................................................... 88
Figure 34: Removing an MCS ................................................................... 89
Figure 35: Removing a PCG..................................................................... 90
Figure 36: Removing a Routing Engine......................................................... 91
Figure 37: Removing the Rear Upper Impeller Assembly ..................................... 92
Figure 38: Removing the Rear Upper Impeller Assembly ..................................... 92
Figure 39: Removing the Rear Lower Impeller Assembly ..................................... 93
Figure 40: Removing the Fan Tray.............................................................. 94
Figure 41: Removing an FPC.................................................................... 96
Figure 42: Removing the Front Impeller Assembly............................................ 97
Figure 43: Attaching the Lifting Handle ........................................................ 98
Figure 44: Installing the Chassis in a Rack ..................................................... 99
Figure 45: Reinstalling the Front Impeller Assembly .........................................101
Figure 46: Reinstalling an FPC .................................................................102
Figure 47: Reinstalling the Fan Tray ...........................................................103
Figure 48: Reinstalling the Rear Lower Impeller Assembly...................................104
Figure 49: Reinstalling the Rear Upper Impeller Assembly...................................105
List of F igu res xiii