Juniper M40 Hardware Manual
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Juniper M40 Hardware Manual

Juniper M40 Hardware Manual

Internet router
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Download this manual See also: Instruction and Installation Manual
Chapter 2

Hardware Component Overview

This chapter provides an overview of the hardware components on the M40 Internet router:
Chassis on page 8
Backplane on page 10
Routing Engine on page 15
Craft Interface on page 17
Power Supplies on page 20
Cooling System on page 23
Hardware Component Overview
7

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Summary of Contents for Juniper M40

  • Page 1: Table Of Contents

    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...

  • Page 2: Chassis

    (see Figure 1 and Figure 2). The chassis is 19 in. (48 cm) wide and 23.5 in. (60 cm) deep. The chassis height of 35 in. (89 cm) enables stacked installation of two M40 routers in a single floor-to-ceiling rack. The two front- or center-mounting ears (one on each side) enable installation into either a front-mount or a center-mount rack.

  • Page 3: Packet Forwarding Engine

    Packet Forwarding Engine Figure 2: Rear View of Chassis Front rack-mounting ear Center rack-mounting ear Upper impeller assembly Fan tray Routing Engine housing LS-120 drive ESD point Power supply A Power supply B Packet Forwarding Engine The Packet Forwarding Engine is a multicomponent system that uses application-specific integrated circuits (ASICs) to perform Layer 2 and Layer 3 packet switching, route lookups, and packet forwarding.

  • Page 4: Backplane

    PICs also encapsulate outgoing packets received from the FPCs before transmitting them. The controller ASIC on each PIC performs additional control functions specific to the PIC media type. M40 Internet Router Hardware Guide...

  • Page 5: Flexible Pic Concentrators (Fpcs)

    Most PICs supported on the M40 router have the following components, but for complete specifications see the M20 and M40 Internet R outers PIC Guide . For information about pinouts for PIC cable connectors, see “Cable Connectors and Pinouts” on page 207.
  • Page 6 LEDs, an offline button is located on the craft interface directly below each FPC slot. For more information, see “FPC LEDs and Offline Button” on page 18. Extractor clips—Control the locking system that secures the FPC in the card cage. M40 Internet Router Hardware Guide...

  • Page 7: System Control Board (Scb)

    Packet Forwarding Engine System Control Board (SCB) The System Control Board (SCB) performs route lookup, filtering, and switching on incoming data packets, then directs outbound packets to the appropriate FPC for transmission to the network. It occupies the center slot of the card cage, installing into the backplane from the front of the chassis (see Figure 1).
  • Page 8 Extractor clips—Control the locking system that secures the SCB in the chassis. For specific information about SCB components (for example, the amount of SSRAM and DRAM), issue the show chassis scb command. Figure 5: System Control Board Access to reset switch LEDs Debug port M40 Internet Router Hardware Guide...

  • Page 9: Routing Engine

    Routing Engine Table 4: States for SCB LEDs Label Color State Description ACTIVE Green Flashing (pulsed with out-time I/O interrupts are occurring. proportional to traffic) Green Blinking SCB processor is running. Normally, the blinking is faint and becomes bright only when the SCB is processing many exceptions.
  • Page 10 Engine (for example, the capacity of the hard disk), issue show chassis routing-engine command. Although the Routing Engine has a PC card slot, it is disabled on the M40 router. The router instead uses an LS-120 disk. Figure 6: Routing Engine Routing Engine 333...

  • Page 11: Craft Interface

    Craft Interface Craft Interface The craft interface provides status and troubleshooting information at a glance and has buttons for deactivating alarms and preparing FPCs for removal. The craft interface is located on the front of the chassis below the FPC card cage, as shown in Figure 1. It includes the elements shown in Figure 7.
  • Page 12 LEDs. Deactivating an alarm turns off both LEDs and deactivates the device attached to the corresponding alarm relay contact. However, the LCD continues to report the alarm message until you clear the condition that caused the alarm. M40 Internet Router Hardware Guide...
  • Page 13 Craft Interface Table 6 describes the alarm LEDs and alarm cutoff button in more detail. Table 6: Alarm LEDs and Alarm Cutoff Button Shape Color State Description On steadily Critical alarm LED—Indicates a critical condition that can cause the router to stop functioning. Possible causes include component removal, failure, or overheating.

  • Page 14: Power Supplies

    LEDs on the power supply, show chassis commands, and messages on the craft interface LCD—to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds. M40 Internet Router Hardware Guide...

  • Page 15: Ac Power Supply

    Power Supplies For information about the cables required for each type of power supply, see “Power System Requirements and Specifications” on page 44. See the following sections for further information about the power supplies: AC Power Supply on page 21 DC Power Supply on page 22 Power Supply LEDs on page 22 AC Power Supply...

  • Page 16: Dc Power Supply

    Table 10: States for Power Supply LEDs Label Color State Description Green On steadily Power supply is functioning normally, input is occurring, outputs are within range, temperature is within range, and fans are operational. FAIL On steadily Power supply has failed. M40 Internet Router Hardware Guide...

  • Page 17: Cooling System

    Cooling System Cooling System The cooling system consists of separate subsystems (sets of fans and impellers) that draw room air into the chassis to keep its internal temperature below a maximum acceptable level. When the temperature is below the maximum, the fans and impellers function at less than full speed.

  • Page 18: Cable Management System

    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. M40 Internet Router Hardware Guide...

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