
M320DCPowerSuppliesDescription...................................74
NonisolatedDCPowerSupply.....................................75
IsolatedDCPowerSupply.........................................75
Components Powered by Each Power Supply Slot . . . . . . . . . . . . . . . . . . . . . 75
DC Power Supply Load Sharing and Fault Tolerance . . . . . . . . . . . . . . . . . . . 76
M320PowerSupplyLEDs............................................76
Chapter 8 Switch Fabric Components and Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . 79
M320SIBDescription...............................................79
M320 Performance for Different SIB Configurations . . . . . . . . . . . . . . . . . . . . . . . 80
M320SIBLEDs.....................................................81
Part 2 Site Planning, Preparation, and Specifications
Chapter9 Preparation Overview .............................................85
M320 Site Preparation Checklist Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
M320RouterPhysicalSpecifications...................................86
Rack Requirements for the M320 Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
M320 Cabinet Size and Clearance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 88
M320CabinetAirflowRequirements...................................90
M320ClearanceRequirements........................................91
M320EnvironmentalSpecifications....................................93
M320 Chassis Grounding Cable and Lug Specifications . . . . . . . . . . . . . . . . . . . . 94
Site Electrical Wiring Guidelines for Juniper Networks Devices . . . . . . . . . . . . . . . 95
DistanceLimitationsforSignaling..................................95
RadioFrequencyInterference.....................................95
Electromagnetic Compatibility ....................................95
M320PowerRequirements...........................................96
M320 RJ-48 Connector Pinouts for the Control Board External Clock Inputs . . . 98
M320FuseSpecifications............................................99
Chapter10 ACPowerSpecifications...........................................101
M320 AC Power Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
M320ACPowerCordSpecifications...................................102
Chapter11 DCPowerSpecifications..........................................105
M320 DC Power Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
DC Power System Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Nonisolated DC Power Supply Electrical Specifications . . . . . . . . . . . . . . . . 106
Isolated DC Power Supply Electrical Specifications . . . . . . . . . . . . . . . . . . . 106
M320DCPowerCableSpecifications..................................107
M320DCPowerDistribution.........................................109
DC Power Circuit Breaker for M320 Routers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Chapter 12 Network Cable and Transceiver Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Understanding Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion . . . . . 111
Signal Loss in Multimode and Single-Mode Fiber-Optic Cable . . . . . . . . . . . . 111
Attenuation and Dispersion in Fiber-Optic Cable . . . . . . . . . . . . . . . . . . . . . . 111
Calculating Power Budget and Power Margin for Fiber-Optic Cables . . . . . . . . . . 112
Calculating Power Budget for Fiber-Optic Cable . . . . . . . . . . . . . . . . . . . . . . 112
Calculating Power Margin for Fiber-Optic Cable . . . . . . . . . . . . . . . . . . . . . . . 113
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