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Hardware Component Overview

Chapter 2

Hardware Component Overview

This chapter provides an overview of the hardware components on the M40 Internet router:

Chassis on page 8

Packet Forwarding Engine on page 9

Backplane on page 10

Physical Interface Cards (PICs) on page 10

Flexible PIC Concentrators (FPCs) on page 11

System Control Board (SCB) on page 13

Routing Engine on page 15

Craft Interface on page 17

Power Supplies on page 20

Cooling System on page 23

Cable Management System on page 24

Summary of Contents for M40

Page 1: ...rnet router Chassis on page 8 Packet Forwarding Engine on page 9 Backplane on page 10 Physical Interface Cards PICs on page 10 Flexible PIC Concentrators FPCs on page 11 System Control Board SCB on page 13 Routing Engine on page 15 Craft Interface on page 17 Power Supplies on page 20 Cooling System on page 23 Cable Management System on page 24 ...

Page 2: ...ge 39 The chassis includes two electrostatic discharge ESD points banana plug receptacles one front and one rear as shown in Figure 1 and Figure 2 Figure 1 Front View of Chassis Before removing or installing components of a functioning router attach an ESD strap to one of the ESD points and place the other end of the strap around your bare wrist Failure to use an ESD strap could result in damage t...

Page 3: ...the power supplies and transfers packets and signals between router components which plug into it Physical Interface Cards PICs Physically connect the router to network media such as OC 12 ATM OC 12 and OC 48 SONET SDH Channelized OC 12 and Gigabit Ethernet PICs are housed in FPCs Flexible PIC Concentrators FPCs Process incoming and outgoing packets From one to eight FPCs can plug into the backpla...

Page 4: ...red memory on the FPCs Transfer of outgoing data cells to the FPCs A second Distributed Buffer Manager ASIC on the backplane passes data cells to the FPCs for reassembly into packets when the data is ready to be transmitted Figure 3 The Backplane Physical Interface Cards PICs Physical Interface Cards PICs are housed on Flexible PIC Concentrators FPCs and physically connect the router to network me...

Page 5: ...gh 7 Each FPC accommodates up to four PICs and the PIC slots in each FPC are numbered from 0 zero through 3 top to bottom An FPC can be installed into any FPC slot regardless of the PICs it contains and any combination of slots can be used If a slot is empty you must install a blank FPC panel to shield it so that cooling air can circulate properly throughout the card cage Figure 4 which shows a ch...

Page 6: ...s used by the I O Manager ASIC Processor subsystem Manages packet handling in the FPC and communication with the SCB It is a PowerPC 603e based CPU with parity protected DRAM EEPROM Stores the serial number and revision level of the FPC Two LEDs Indicate FPC status There is a green one labeled OK and a red one labeled FAIL The LEDs for each FPC are located directly below it on the router craft int...

Page 7: ...Engine which generates control messages or sets an alarm The SCB also relays control messages from the Routing Engine to the router components Transfer of exception and control packets The Internet Processor or Internet Processor II ASIC passes exception packets to the microprocessor on the SCB which processes almost all of them The SCB sends any remaining exception packets to the Routing Engine f...

Page 8: ...T1 and STAT2 Table 4 describes the LED states Reset switch Restarts the SCB when pressed causing the Packet Forwarding Engine to reset and halting packet forwarding for up to approximately two minutes Do not use the reset switch under normal circumstances to access it push the end of a paper clip or other small probing device through the hole in the SCB faceplate Extractor clips Control the lockin...

Page 9: ...net software to maintain the router s routing tables and routing protocols It has a Pentium class processor SDRAM Provides storage for the routing and forwarding tables and for other Routing Engine processes Compact flash drive Provides primary storage for software images configuration files and microcode The drive is fixed and inaccessible from outside the router Hard drive Provides secondary sto...

Page 10: ...Engine The appearance and position of electronic components or the PC card slot on your Routing Engine might differ from the figures in this section These differences do not affect Routing Engine installation and removal or functionality For specific information about components in a Routing Engine for example the capacity of the hard disk issue the show chassis routing engine command Although the...

Page 11: ...ace see the following sections FPC LEDs and Offline Button on page 18 Alarm Relay Contacts LEDs and Cutoff Button on page 18 LCD on page 19 Routing Engine LEDs and Interface Ports on page 19 The power supply LEDs are located on the power supply faceplate rather than on the craft interface For more information see Power Supplies on page 20 FAIL OK FAIL OK FAIL OK FAIL OK FAIL OK FAIL 0 1 2 3 4 5 6 ...

Page 12: ...M lights to indicate a less severe condition that requires monitoring or maintenance Both LEDs can be lit simultaneously The LCD on the craft interface reports the cause of the alarm To the left of the LEDs are the corresponding relay contacts for connecting the router to external alarm reporting devices A system condition that causes the red or yellow alarm LED to light on the craft interface als...

Page 13: ...system administrators can issue JUNOS command line interface CLI commands to manage the router The green LED labeled OK and red LED labeled FAIL indicate Routing Engine status as described in Table 7 Table 7 States for Routing Engine LEDs Shape Color State Description Red On steadily Critical alarm LED Indicates a critical condition that can cause the router to stop functioning Possible causes inc...

Page 14: ...cool the power assembly The power supplies are fully redundant When both power supplies are operational they automatically share the electrical load If one power supply stops functioning for any reason the remaining power supply instantly begins providing all the power the router needs for normal functioning and can provide full power indefinitely Power supplies are hot removable and hot insertabl...

Page 15: ...ated at the bottom rear of the chassis as shown in Figure 2 Figure 8 shows the power supply and Table 8 lists electrical specifications For information about the LEDs on the power supply see Power Supply LEDs on page 22 Figure 8 AC Power Supply Table 8 AC Power Supply Electrical Specifications Captive screw Power switch Status LEDs Handle Extractor inserter Grounding points Appliance inlet Safety ...

Page 16: ...ical Specifications Power Supply LEDs Table 10 describes the LEDs on both AC and DC power supplies Table 10 States for Power Supply LEDs 1038 Handle Extractor inserter Captive screw Safety interlock lever Status LEDs Power switch Grounding studs Power terminals Description Specification Maximum power output 1500 W Input voltage 40 through 75 VDC operating range Input current rating 35A 48V Output ...

Page 17: ...s front below the craft interface as shown in Figure 1 The air filter prevents dust and other particles from entering the cooling system For replacement instructions see Maintain and Replace the Air Filter on page 154 Upper and lower impeller assemblies Cool the Packet Forwarding Engine components backplane SCB FPCs and PICs The lower impeller assembly is located behind the craft interface at the ...

Page 18: ... is shielded by a removable cover Threading PIC cables through the hooks keeps cables in place reduces tangling prevents undue stress on a cable by distributing its weight evenly and helps maintain the proper bend radius for optical cables Power supply and Fans Lower impellers Packet Forwarding Engine Upper impellers Routing Engine Fan tray Backplane Air intake for power supply cooling Air intake ...

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