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Calculating the J-EX8200 Switch Fiber-Optic Cable Power Margin

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Dell PowerConnect J-Series J-EX8216 Ethernet Switch Hardware Guide -15 dBm - (-28 dBm) = 13 dBm Related • Calculating the J-EX8200 Switch Fiber-Optic Cable Power Margin on page 92 Documentation • Optical Interface Support in J-EX8200 Switches on page 51 • Understanding J-EX8200 Switch Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion on page 78 Calculating the J-EX8200 Switch Fiber-Optic Cable Power Margin Calculate the link's power margin when planning fiber-optic cable layout and distances to ensure that fiber-optic connections have sufficient signal power to overcome system losses and still satisfy the minimum input requirements of the receiver for the required performance level. The power margin (P ) is the amount of power available after M attenuation or link loss (LL) has been subtracted from the power budget (P ). B When you calculate the power margin, you use a worst-case analysis to provide a margin of error, even though all the parts of an actual system do not operate at worst-case levels. A power margin (P ) greater than zero indicates that the power budget is sufficient M to operate the receiver and that it does not exceed the maximum receiver input power. This means the link will work. A (P ) that is zero or negative indicates insufficient power M to operate the receiver. See the specification for your receiver to find the maximum receiver input power. Before you begin to calculate the power margin: • Calculate the power budget. See "Calculating the J-EX8200 Switch Fiber-Optic Cable Power Budget" on page 91. To calculate the worst-case estimate for the power margin (P ) for the link: M 1. Determine the maximum value for link loss (LL) by adding estimated values for applicable link-loss factors-for example, use the sample values for various factors as provided in Table 43 on page 92 (here, the link is 2 km long and multimode, and the (P ) is 13 dBm): B Table 43: Estimated Values for Factors Causing Link Loss Link-Loss Factor Estimated Link-Loss Value Sample (LL) Calculation Values Higher-order mode losses (HOL) Modal and chromatic dispersion • Multimode-0.5 dBm • Single mode-None • Multimode-None, if product of bandwidth and distance is less than 500 MHz/km • Single mode-None • 0.5 dBm • 0 dBm • 0 dBm • 0 dBm 92

Section	Page
Table of Contents	7
About This Guide	13
How to Use This Guide	13
Downloading Software	14
Documentation Conventions	14
Repair and Warranty	15
Requesting Technical Support	15
Part 1: Switch and Components Overview and Specifications	17
Chapter 1: Dell PowerConnect J-Series J-EX8216 Switch Overview	19
J-EX8216 Switch Hardware Overview	19
Software	19
Chassis Physical Specifications, LCD Panel, and Midplane	20
Routing Engines and Switch Fabric	21
Line Cards	22
Cooling System	22
Power Supplies	23
J-EX8216 Switch Configurations	23
Chassis Physical Specifications of a J-EX8216 Switch	25
Understanding J-EX8216 Switch Component and Functionality Redundancy	28
Hardware Components That Provide Redundancy	28
Routing Engine and Control Redundancy	29
Switch Fabric Redundancy	29
Slot Numbering for a J-EX8216 Switch	30
Slot Numbering for RE Module Slots and Line Card Slots	30
Slot Numbering for the Power Supply Slots	32
Slot Numbering for the SF Module Slots	33
Chapter 2: Component Descriptions	35
LCD Panel in a J-EX8200 Switch	35
LCD Panel Modes	36
LCD Panel Menus	37
Chassis Status LEDs in a J-EX8200 Switch	40
Field-Replaceable Units in a J-EX8216 Switch	41
Routing Engine (RE) Module in a J-EX8216 Switch	42
RE Module LEDs in a J-EX8216 Switch	43
Management Port LEDs in J-EX8200 Switches	45
Switch Fabric (SF) Modules in a J-EX8216 Switch	45
SF Module LEDs in a J-EX8216 Switch	47
8-port SFP+ Line Card in a J-EX8200 Switch	48
48-port SFP Line Card in a J-EX8200 Switch	49
48-port RJ-45 Line Card in a J-EX8200 Switch	50
Line Card LEDs in a J-EX8200 Switch	51
Network Port LEDs in a J-EX8200 Switch	52
AC Power Supply in a J-EX8200 Switch	55
AC Power Supply Description	55
N+1 Redundancy Configuration of AC Power Supplies	56
N+N Redundancy Configuration of AC Power Supplies	57
AC Power Supply LEDs in a J-EX8200 Switch	58
Cooling System and Airflow in a J-EX8216 Switch	60
Midplane in a J-EX8216 Switch	64
Chapter 3: Component Specifications	65
USB Port Specifications for a J-EX Series Switch	65
Console Port Connector Pinout Information for a J-EX Series Switch	65
Management Port Connector Pinout Information for a J-EX8200 Switch	66
Optical Interface Support in J-EX8200 Switches	67
Grounding Cable and Lug Specifications for J-EX8200 Switches	75
Part 2: Planning for Switch Installation	77
Chapter 4: Site Preparation	79
Site Preparation Checklist for a J-EX8200 Switch	79
General Site Guidelines for J-EX Series Switches	80
Site Electrical Wiring Guidelines for J-EX Series Switches	81
Environmental Requirements and Specifications for J-EX Series Switches	82
Chapter 5: Rack and Cabinet Requirements	85
Rack Requirements for a J-EX8216 Switch	85
Cabinet Requirements and Specifications for a J-EX8216 Switch	87
Clearance Requirements for Airflow and Hardware Maintenance for a J-EX8216 Switch	89
Chapter 6: Cable Requirements	93
Cables Connecting the J-EX8200 Switch to Management Devices	93
Understanding J-EX8200 Switch Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion	94
Signal Loss in Multimode and Single-Mode Fiber-Optic Cable	94
Attenuation and Dispersion in Fiber-Optic Cable	94
Chapter 7: Planning Power Requirements	97
AC Power Specifications for J-EX8200 Switches	97
Power Requirements for J-EX8216 Switch Components	98
AC Power Cord Specifications for a J-EX8200 Switch	99
Calculating Power Requirements for a J-EX8216 Switch	101
Calculating the Power Consumption of Your J-EX8216 Switch Configuration	102
Calculating the System Thermal Output for Your J-EX8216 Switch Configuration	103
Calculating the Number of Power Supplies Required for Your J-EX8216 Switch Configuration	104
Calculating the J-EX8200 Switch Fiber-Optic Cable Power Budget	107
Calculating the J-EX8200 Switch Fiber-Optic Cable Power Margin	108
Part 3: Installing and Connecting the Switch and Switch Components	111
Chapter 8: Installing the Switch	113
Installing and Connecting a J-EX8216 Switch	113
Unpacking a J-EX8200 Switch	114
Parts Inventory (Packing List) for a J-EX8216 Switch	117
Installing Adjustable Mounting Brackets in a Rack or Cabinet for a J-EX8200 Switch	119
Installing the Power Cord Tray in a Rack or Cabinet for a J-EX8200 Switch	122
Mounting a J-EX8216 Switch on a Rack or Cabinet	124
Chapter 9: Installing Switch Components	129
Installing and Removing J-EX8216 Switch Hardware Components	129
Installing an AC Power Supply in a J-EX8200 Switch	130
Installing a Fan Tray in a J-EX8216 Switch	132
Installing an RE Module in a J-EX8216 Switch	134
Installing an SF Module in a J-EX8216 Switch	136
Unpacking a Line Card Used in a J-EX8200 Switch	138
Installing a Line Card in a J-EX8200 Switch	139
Installing a Transceiver in a J-EX Series Switch	142
Connecting a Fiber-Optic Cable to a J-EX Series Switch	143
Chapter 10: Connecting the Switch	145
Connecting Earth Ground to a J-EX Series Switch	145
Connecting Earth Ground to a J-EX8216 Switch	146
Connecting AC Power to a J-EX8200 Switch	147
Powering On a J-EX8200 Switch	149
Connecting a J-EX Series Switch to a Network for Out-of-Band Management	151
Connecting a J-EX Series Switch to a Management Console	152
Connecting a J-EX Series Switch to a Modem	153
Setting the Serial Console Speed for the Switch	154
Configuring the Modem	155
Connecting the Modem to the Console Port	156
Chapter 11: Performing Initial Configuration	159
J-EX8200 Switch Default Configuration	159
Connecting and Configuring a J-EX Series Switch (CLI Procedure)	160
Connecting and Configuring a J-EX Series Switch (J-Web Procedure)	162
Part 4: Removing the Switch and Switch Components	165
Chapter 12: Removing the Switch	167
Powering Off a J-EX8200 Switch	167
Removing a J-EX8216 Switch from a Rack or Cabinet	168
Chapter 13: Removing Switch Components	173
Removing an AC Power Supply from a J-EX8200 Switch	173
Removing a Fan Tray from a J-EX8216 Switch	175
Taking the RE Module Offline in a J-EX8216 Switch	177
Taking an RE Module Offline in a Switch with Redundant RE Modules	177
Taking an RE Module Offline in a Switch With One RE Module	178
Removing an RE Module from a J-EX8216 Switch	179
Taking the SF Module Offline in a J-EX8216 Switch	180
Removing an SF Module from a J-EX8216 Switch	181
Removing a Line Card from a J-EX8200 Switch	182
Removing a Transceiver from a J-EX Series Switch	184
Disconnecting a Fiber-Optic Cable from a J-EX Series Switch	186
Removing the Power Cord Tray from a Rack or Cabinet for a J-EX8200 Switch	187
Part 5: Switch and Component Maintenance	189
Chapter 14: Routine Maintenance	191
Handling and Storing Line Cards in J-EX8200 Switches	191
Holding a Line Card	192
Storing a Line Card	194
Maintaining Line Card Cables in J-EX8200 Switches	194
Maintaining Fiber-Optic Cables in J-EX Series Switches	195
Part 6: Returning Hardware	197
Chapter 15: Getting Help	199
Obtaining Assistance	199
Online Services	200
Automated Order-Status Service	201
Support Service	201
Dell Enterprise Training and Certification	201
Problems With Your Order	201
Product Information	201
Returning Items for Warranty Repair or Credit	201
Before You Call	202
Diagnostics Checklist	202
Contacting Dell	203
Locating a J-EX Series Switch Component Serial Number and Agency Labels	203
Locating the Serial Number on a J-EX8200 Switch or Component	204
Locating the Chassis Serial Number and Agency Labels	204
Locating the Serial Number ID Labels on FRUs in a J-EX8200 Switch	205
Packing a J-EX8216 Switch or Component for Shipping	209
Packing a J-EX8216 Switch for Shipping	210
Packing J-EX8216 Switch Components for Shipping	212
Packing a Line Card Used in a J-EX8200 Switch	213
Dell Support	214
Part 7: Safety Information	215
Chapter 16: General Safety Information	217
General Safety Guidelines and Warnings for J-EX Series Switches	217
Definitions of Safety Warning Levels for J-EX Series Switches	218
Fire Safety Requirements for J-EX Series Switches	220
Qualified Personnel Warning for J-EX Series Switches	221
Warning Statement for Norway and Sweden for J-EX Series Switches	222
Chapter 17: Radiation and Laser Warnings	223
Laser and LED Safety Guidelines and Warnings for J-EX Series Switches	223
General Laser Safety Guidelines	223
Class 1 Laser Product Warning	223
Class 1 LED Product Warning	224
Laser Beam Warning	224
Radiation from Open Port Apertures Warning for J-EX Series Switches	226
Chapter 18: Installation and Maintenance Safety Information	229
Installation Instructions Warning for J-EX Series Switches	229
Chassis Lifting Guidelines for J-EX8200 Switches	230
Ramp Warning for J-EX Series Switches	230
Rack-Mounting and Cabinet-Mounting Warnings for J-EX Series Switches	231
Grounded Equipment Warning for J-EX Series Switches	235
Maintenance and Operational Safety Guidelines and Warnings for J-EX Series Switches	236
Battery Handling Warning	236
Jewelry Removal Warning	237
Lightning Activity Warning	239
Operating Temperature Warning	240
Product Disposal Warning	241
Chapter 19: Power and Electrical Safety Information	245
General Electrical Safety Guidelines and Warnings for J-EX Series Switches	245
Prevention of Electrostatic Discharge Damage on J-EX Series Switches	246
AC Power Electrical Safety Guidelines for J-EX Series Switches	248
AC Power Disconnection Warning for J-EX Series Switches	249
Multiple Power Supplies Disconnection Warning for J-EX Series Switches	250
TN Power Warning for J-EX Series Switches	250
In Case of Electrical Accident: Action to Take on a J-EX Series Switch	251
Part 8: Compliance Information	253
Chapter 20: Compliance Information	255
Agency Approvals for J-EX Series Switches	255
Compliance Statements for EMC Requirements for J-EX Series Switches	256
Canada	256
European Community	257
Japan	257
United States	257
FCC Part 15 Statement	257
Non-Regulatory Environmental Standards	258
Compliance Statements for Acoustic Noise for J-EX Series Switches	258
Declarations of Conformity for J-EX8216 Switches	259
Part 9: Index	261
Index	263
Symbols	263
A	263
B	263
C	263
D	264
E	264
F	264
G	265
H	265
I	265
J	265
L	265
M	266
N	266
O	266
P	266
R	267
S	267
T	268
U	268

Match case Limit results 1 per page

–15 dBm – (–28 dBm) = 13 dBm

Documentation

Calculating the J-EX8200 Switch Fiber-Optic Cable Power Margin on page 92

•

Optical Interface Support in J-EX8200 Switches on page 51

•

Understanding J-EX8200 Switch Fiber-Optic Cable Signal Loss, Attenuation, and

Dispersion on page 78

Calculating the J-EX8200 Switch Fiber-Optic Cable Power Margin

Calculate the link's power margin when planning fiber-optic cable layout and distances

to ensure that fiber-optic connections have sufficient signal power to overcome system

losses and still satisfy the minimum input requirements of the receiver for the required

performance level. The power margin (

) is the amount of power available after

attenuation or link loss (

) has been subtracted from the power budget (

When you calculate the power margin, you use a worst-case analysis to provide a margin

of error, even though all the parts of an actual system do not operate at worst-case

levels. A power margin (

) greater than zero indicates that the power budget is sufficient

to operate the receiver and that it does not exceed the maximum receiver input power.

This means the link will work. A (

) that is zero or negative indicates insufficient power

to operate the receiver. See the specification for your receiver to find the maximum

receiver input power.

Before you begin to calculate the power margin:

•

Calculate the power budget. See “Calculating the J-EX8200 Switch Fiber-Optic Cable

Power Budget” on page 91.

To calculate the worst-case estimate for the power margin (

) for the link:

Determine the maximum value for link loss (

) by adding estimated values for

applicable link-loss factors—for example, use the sample values for various factors

as provided in Table 43 on page 92 (here, the link is 2 km long and multimode, and

the (

) is 13 dBm):

Table 43: Estimated Values for Factors Causing Link Loss

Sample (LL) Calculation Values

Estimated Link-Loss Value

Link-Loss Factor

•

0.5 dBm

•

0 dBm

•

Multimode—0.5 dBm

•

Single mode—None

Higher-order mode losses (HOL)

•

0 dBm

•

0 dBm

•

Multimode—None, if product of

bandwidth and distance is less than

500 MHz/km

•

Single mode—None

Modal and chromatic dispersion

Dell PowerConnect J-Series J-EX8216 Ethernet Switch Hardware Guide