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P
M
= P
B
– LL
P
M
= 13 dB – 2 km (1.0 dB/km) – 5 (0.5 dB) – 2 (0.5 dB) – 0.5 dB [HOL] – 1 dB [CRM]
P
M
= 13 dB – 2 dB – 2.5 dB – 1 dB – 0.5 dB – 1 dB
P
M
= 6 dB
The following sample calculation for an 8-km-long single-mode link with a power budget
(P
B
) of 13 dB uses the estimated values from Table 44 on page 309 to calculate link loss
(LL) as the sum of fiber attenuation (8 km @ 0.5 dB/km, or 4 dB) and loss for seven
connectors (0.5 dB per connector, or 3.5 dB). The power margin (P
M
) is calculated as
follows:
P
M
= P
B
– LL
P
M
= 13 dB – 8 km (0.5 dB/km) – 7(0.5 dB)
P
M
= 13 dB – 4 dB – 3.5 dB
P
M
= 5.5 dB
In both examples, the calculated power margin is greater than zero, indicating that the
link has sufficient power for transmission and does not exceed the maximum receiver
input power.
Related
Documentation
Supported Network Interface Standards by Transceiver•
• Understanding Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion on page 307
Routing Engine Interface Cable and Wire Specifications for MX Series Routers
Table 45 on page 310 lists the specifications for the cables that connect to management
ports and the wires that connect to the alarm relay contacts.
Table 45: Cable and Wire Specifications for Routing Engine Management
and Alarm Interfaces
Router
Receptacle
Maximum
Length
Cable/Wire
Supplied
Cable
SpecificationPort
RJ-45 female6 ft (1.83 m)One 6-ft
(1.83-m) length
with RJ-45/DB-9
connectors
RS-232
(EIA-232) serial
cable
Routing Engine
console or
auxiliary
interface
RJ-45
autosensing
328 ft (100 m)One 15-ft
(4.57-m) length
with
RJ-45/RJ-45
connectors
Category 5 cable
or equivalent
suitable for
100Base-T
operation
Routing Engine
Ethernet
interface
Copyright © 2013, Juniper Networks, Inc.310
MX480 3D Universal Edge Router Hardware Guide
- Hardware Guide 1
- END USER LICENSE AGREEMENT 3
- Part 4 Appendixes 11
- Table of Contents 13
- Part 5 Index 14
- List of Figures 15
- Procedures 17
- List of Tables 19
- About the Documentation 21
- ExamplesDescriptionConvention 22
- Documentation Feedback 23
- Requesting Technical Support 23
- Opening a Case with JTAC 24
- Overview 25
- MX480 Router Overview 27
- MX480 Component Redundancy 28
- MX480 Hardware Components 31
- MX480 Midplane Description 33
- Figure 4: Midplane 34
- DPC 40x1GE DPC 4x10GE 35
- DPC Components 36
- MPC Components 38
- MX Series 3D Universal Edge 40
- Routers Line Card Guide 40
- FPC3MX-FPC2 41
- FPC Components 42
- MX480 PIC Overview 43
- MX480 PIC LEDs 44
- MX480 AS MLC Function 45
- AS MLC Components 45
- MX480 AS MSC LEDs 48
- Table 4: AS MSC LEDs 48
- MX480 Host Subsystem Overview 49
- MX480 Host Subsystem LEDs 50
- Figure 14: SCB 51
- Table 6: SCB LEDs 52
- Figure 15: MX SCBE 53
- MX SCBE Slots 54
- MX SCBE Redundancy 54
- MX SCBE Components 54
- Table 7: Enhanced MX SCB LEDs 55
- MX480 Routing Engine Overview 56
- Routing Engine Boot Sequence 57
- RE-S-1800 Routing Engine LEDs 59
- Table 8: Routing Engine LEDs 59
- MX480 Routing Engine LEDs 60
- Table 9: Routing Engine LEDs 60
- ACO/LT (for “alarm 61
- DescriptionStateColorShape 62
- DescriptionStateColorLabel 62
- MX480 Power Supply Overview 65
- Figure 21: AC Power Supply 66
- MX480 3D Universal 67
- Edge Router Hardware Guide 67
- MX480 AC Power Supply LEDs 68
- Figure 23: DC Power Supply 69
- MX480 DC Power Supply LEDs 70
- MX480 Cooling System Overview 71
- Figure 26: Fan Tray 72
- Figure 27: Air Filter 72
- MX480 Fan LED 73
- Setting Up the MX480 Router 75
- Installation 77
- Rack Size and Strength 78
- U is the standard rack 79
- CHAPTER 4 83
- 9. Power on the router 84
- Unpacking the MX480 Router 85
- QuantityComponent 87
- Hardware 89
- Figure 38: Removing an SCB 96
- Figure 39: Removing a DPC 97
- Figure 40: Removing an FPC 98
- O) position 100
- Figure 45: Reinstalling a DPC 104
- Documentation 106
- Mechanical Lift 107
- Figure 50: Removing an SCB 110
- Figure 51: Removing a DPC 111
- Figure 52: Removing an FPC 112
- Figure 57: Reinstalling a DPC 119
- Connecting the MX480 Router 121
- Figure 59: Ethernet Port 122
- Fiber-optic cable 125
- MX480 Router 127
- Grounding the MX480 Router 128
- Supplies 129
- AC OK and DC OK LEDs light 130
- PS FAIL LED is not lit 130
- AUX, CONSOLE, or ETHERNET) 131
- 131
- RTN (return) terminal 135
- –48V (input) terminal 135
- RETURN) and the negative 137
- —) position 137
- (O) position if you 138
- Powering Off the MX480 Router 139
- Configuring Junos OS 141
- Components 147
- Maintaining MX480 DPCs 154
- Maintaining MX480 FPCs 156
- 0, and 1: 157
- Maintaining MX480 PICs 158
- Maintaining MX480 MPCs 159
- 5, bottom to top: 160
- Maintaining MX480 MICs 161
- MX480 DPC Terminology 163
- Figure 71: DPC Edges 164
- Storing an MX480 DPC 166
- Figure 74: FPC Edges 167
- Holding an MX480 FPC 168
- Storing an MX480 FPC 170
- Figure 78: Do Not Stack FPCs 171
- Alarm Relay Contacts 174
- Craft Interface LEDs 174
- Component LEDs 175
- OK LED lights green steadily 176
- 0 through 1, left to right: 179
- CHAPTER 14 185
- ComponentsTool or Part 186
- Removing the MX480 Air Filter 187
- Replacing the MX480 Fan Tray 192
- Installing the MX480 Fan Tray 193
- RE MASTER LED 196
- Master in 197
- Current state field: 197
- Replacing an MX480 SCB 198
- Figure 87: Removing an SCB 199
- Figure 88: Installing an SCB 200
- Upgrading an MX480 SCB 201
- FAIL LED still 210
- ETHERNET port: 212
- Figure 93: Cable Connector 213
- Figure 94: Ethernet Port 213
- Replacing an MX480 DPC 214
- Figure 96: Removing a DPC 216
- Installing an MX480 DPC 216
- Figure 97: Installing a DPC 217
- Replacing an MX480 FPC 218
- OK LED next to the button 219
- Figure 99: Removing an FPC 220
- Installing an MX480 FPC 221
- OK LED next to the 222
- Replacing an MX480 PIC 223
- Figure 101: Removing a PIC 225
- Installing an MX480 PIC 225
- Replacing an MX480 MPC 227
- Removing an MX480 MPC 228
- Figure 103: Removing an MPC 229
- Installing an MX480 MPC 230
- Figure 104: Installing an MPC 231
- Replacing an MX480 MIC 232
- Figure 105: Removing a MIC 233
- Installing an MX480 MIC 234
- Figure 108: Installing a MIC 235
- S on the bottom of the MPC 236
- S on the top of the MPC 236
- OK/FAIL LED lights green 237
- Dual-wide MIC 237
- Replacing an MX480 AS MLC 238
- Installing an MX480 AS MLC 240
- Replacing an MX480 AS MSC 241
- Installing an MX480 AS MSC 242
- Replacing an MX480 AS MXC 244
- Installing an MX480 AS MXC 245
- O) position if you 258
- PWR OK LED to go on 258
- —) position and 260
- O)position 261
- INPUT OK LED is off 261
- Appendixes 265
- APPENDIX A 267
- Qualified Personnel Warning 270
- Fire Suppression 273
- Fire Suppression Equipment 274
- Ramp Warning 279
- Class 1 Laser Product Warning 281
- Class 1 LED Product Warning 281
- Laser Beam Warning 282
- Battery Handling Warning 283
- Jewelry Removal Warning 284
- Lightning Activity Warning 286
- Operating Temperature Warning 286
- Product Disposal Warning 287
- Grounded Equipment Warning 289
- Power Disconnection Warning 291
- OFF position 296
- European Community 301
- Declaration of Conformity 301
- United States 303
- APPENDIX B 305
- MX480 Router Environmental 307
- Specifications 307
- APPENDIX D 309
- Table 29: MX480 DC Zoning 310
- One 6-AWG (13.3 mm 320
- SpecificationItem 321
- High-Capacity Power Supplies 321
- 2+23+12+23+1Redundancy 322
- Plug Type 323
- Electrical 323
- Figure 130: AC Plug Types 324
- (+) and (–) to indicate 327
- Eight 6-AWG (13.3 mm 328
- Radio Frequency Interference 329
- Electromagnetic Compatibility 329
- Cable and Wire Guidelines and 331
- MX480 Cable Connector Pinouts 337
- DescriptionSignalPin 338
- Returning MX480 Hardware 339
- MX480 SCB Serial Number Label 342
- Serial number 343
- ID label 343
- MX480 FPC Serial Number Label 344
- Serial number ID label 345
- MX480 MPC Serial Number Label 346
- Serial number ID 347
- Contacting Customer Support 351
- Series Router 352
- Index on page 333 355
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