Arista 7500N Series User manual

Quick Start Guide
7500N Series Modular
Data Center Switch
Arista Networks
www.arista.com
PDOC-00114-14

ii 9 March 2020Quick Start Guide: 7500N Series Modular Switches
© Copyright 2020 Arista Networks, Inc. The information contained herein is subject to change without notice. Arista Networks
and the Arista logo are trademarks of Arista Networks, Inc in the United States and other countries. Other product or service
names may be trademarks or service marks of others.
Headquarters
5453 Great America Parkway
Santa Clara, CA 95054
USA
[phone]
www.arista.com
Support
[phone]
[phone]
[email protected]
Sales
[phone]
[phone]
[email protected]

Quick Start Guide: 7500N Series Modular Switches 9 March 2020iii
Table of Contents
Chapter 1 Overview.............................................................................................................1
1.1 Scope...................................................................................................................................................... 1
1.2 Receiving and Inspecting the Equipment ............................................................................................... 1
1.3 Installation Process................................................................................................................................. 1
1.4 Safety Information................................................................................................................................... 2
1.5 Obtaining Technical Assistance.............................................................................................................. 2
1.6 Specifications.......................................................................................................................................... 3
Chapter 2 Preparation.........................................................................................................7
2.1 Site Selection.......................................................................................................................................... 7
2.2 Tools and Parts Required for Installation................................................................................................ 8
2.3 Electrostatic Discharge (ESD) Precautions ............................................................................................ 9
Chapter 3 Rack Mounting the Switch ..............................................................................11
3.1 7504N and 7508N Rack Mounting........................................................................................................ 11
3.1.1 Two-Post Rack Mount.............................................................................................................. 11
3.1.2 Attaching Mounting Brackets to the Chassis ........................................................................... 11
3.1.3 Inserting the Switch into the Rack............................................................................................ 12
3.1.4 Four-Post Rack Mount............................................................................................................. 13
3.1.5 Assembling the Shelf ............................................................................................................... 13
3.1.6 Inserting the Switch into the Rack............................................................................................ 16
3.2 7512N and 7516N Shelf Rack Mount Installation ................................................................................. 17
3.2.1 Assembling the Shelf ............................................................................................................... 17
3.2.2 Inserting the Switch into the Rack............................................................................................ 22
Chapter 4 Cabling the Modular Switch............................................................................25
4.1 Cabling the Power Supplies.................................................................................................................. 25
4.2 Cabling Secondary Ground .................................................................................................................. 26
4.3 Cabling the AC Power Supply .............................................................................................................. 27
4.4 Cabling the DC Power Supply .............................................................................................................. 27
4.4.1 DC Power Supplies.................................................................................................................. 27
4.4.2 Wire and Lug Preparation........................................................................................................ 27
4.4.3 PWR-3K-DC-RED Power Supply............................................................................................. 28
4.5 DC Power Adapter Installation for PWR-2700-DC-R............................................................................ 29

iv 9 March 2020Quick Start Guide: 7500N Series Modular Switches
4.5.1 Connecting the Power Cable Lug to the Terminal Studs ......................................................... 29
4.5.2 Connecting the Ground to PWR-2700-DC-R Power Supply.................................................... 29
4.5.3 Connecting the Power Cable Lug to the Terminal Studs ......................................................... 30
4.6 Power Supply Specifications ................................................................................................................ 33
4.7 Power Supply Configurations ............................................................................................................... 33
4.7.1 Recommendations for power supply usage............................................................................. 33
4.8 Power Supply Redundancy .................................................................................................................. 34
4.9 Connecting Supervisor Cables ............................................................................................................. 35
4.10 Connecting Line Card Modules and Cables ......................................................................................... 38
Chapter 5 Configuring the Modular Switch ....................................................................39
Appendix A Status Indicators...........................................................................................41
A.1 Supervisor Module................................................................................................................................ 41
A.1.1 Supervisor Indicators: 7500E-SUP/7500-SUP2....................................................................... 41
A.2 Line Card Module Indicators................................................................................................................. 43
A.3 Fabric Status Indicators ........................................................................................................................ 44
A.4 Power Supply Status Indicators............................................................................................................ 45
Appendix B Parts List........................................................................................................49
B.1 Parts Used in All Rack Mount Configurations....................................................................................... 50
B.1.1 Cables...................................................................................................................................... 50
B.1.2 Getting-Started Booklet............................................................................................................ 50
B.2 Two-Post Rack Mount Parts ................................................................................................................. 50
B.3 Four-Post Rack Mount Parts for 4-slot and 8-slot Chassis................................................................... 51
B.4 Four Post Rack Mount for 12-slot and 16-slot Chassis......................................................................... 53
Appendix C Front Panel ....................................................................................................55
Appendix D Rear Panel .....................................................................................................59
Appendix E Line Cards .....................................................................................................63
Appendix F Maintenance and Field Replacement ..........................................................73
F.1 Power Supplies..................................................................................................................................... 73
F.1.1 Removing AC Power Supply.................................................................................................... 73
F.1.2 Removing DC Power Supply ................................................................................................... 74
F.1.3 Removing Power Supply Blank................................................................................................ 74
F.1.4 Installing AC Power Supply...................................................................................................... 75
F.1.5 Installing DC Power Supply ..................................................................................................... 75
F.2 Fabric and Fan Module (Fabric Module)............................................................................................... 75
F.2.1 Removing Fabric Module......................................................................................................... 76
F.2.2 Removing Fabric Module Blank............................................................................................... 76
F.2.3 Installing Fabric Module........................................................................................................... 76
F.2.4 Removing Service Provider 7500N Series Fan and Safety Guard .......................................... 76

Quick Start Guide: 7500N Series Modular Switches 9 March 2020v
F.3 Touch Point Shield (Optional)............................................................................................................... 77
F.3.1 Installing the Touch Point Shield.............................................................................................. 77
F.4 Supervisor Module................................................................................................................................ 78
F.4.1 Removing Supervisor Module.................................................................................................. 78
F.4.2 Removing Supervisor Module Blank........................................................................................ 78
F.4.3 Installing Supervisor Module.................................................................................................... 78
F.5 Linecards .............................................................................................................................................. 78
F.5.1 Removing Linecard.................................................................................................................. 79
F.5.2 Removing Linecard Blank ........................................................................................................ 79
F.5.3 Installing Linecard.................................................................................................................... 79
Appendix G Taiwan RoHS Information ............................................................................81

vi 9 March 2020Quick Start Guide: 7500N Series Modular Switches

Quick Start Guide: 7500N Series Modular Switches 1
Chapter 1
Overview
1.1 Scope
This guide is intended for properly trained service personnel and technicians who need to install the
following Arista Networks Data Center Switches:
• DCS-7504N
• DCS-7508N
• DCS-7512N
• DCS-7516N
Important! Only qualified personnel should install, service, or replace this equipment.
Seul le personnel qualifié doit installer, service, ou remplacer cet équipement.
1.2 Receiving and Inspecting the Equipment
Upon receiving the switch, inspect the shipping boxes and record any external damage. Retain packing
materials if you suspect that part of the shipment is damaged; the carrier may need to inspect them.
If the boxes were not damaged in transit, unpack them carefully. Ensure that you do not discard any
accessories that may be packaged in the same box as the main unit.
Inspect the packing list and confirm that you received all listed items. Compare the packing list with
your purchase 7500N Series Modular Switches order. Appendix B provides a list of components
included with the switch.
1.3 Installation Process
The following tasks are required to install and use the switch:
Step 1 Select and prepare the installation site (Section 2.1).
Step 2 Assemble the installation tools listed (Section 2.2).
Step 3 Attach the mounting brackets and install the switch in an equipment rack (Chapter 3).
Step 4 Connect the switch to the power source and network devices (Chapter 4).
Step 5 Configure the switch (Chapter 5).

2Quick Start Guide: 7500N Series Modular Switches
Safety Information Chapter 1: Overview
Important! Class 1 Laser Product: This product has provisions to install Class 1 laser transceivers that provides
optical coupling to the communication network. Once a Class 1 laser product is installed, the
equipment is a Class 1 Laser Product (Appareil à Laser de Classe 1). The customer is responsible for
selecting and installing the Class 1 laser transceiver and for insuring that the Class 1 AEL (Allowable
Emission Limit) per EN/IEC 60825, CSA E60825-1, and Code of Federal Regulations 21 CFR 1040 is
not exceeded after the laser transceiver have been installed. Do not install laser products whose class
rating is greater than 1. Refer to all safety instructions that accompanied the transceiver prior to
installation. Only Class 1 laser devices certified for use in the country of installation by the cognizant
agency are to be utilized in this product.
Produit Laser de classe 1: Ce produit a des dispositions pour installer des émetteurs-récepteurs de
laser de classe 1 qui offre de couplage au réseau de communication optique.Une fois un produit laser
de classe 1 est installé, l'équipement est un produit Laser de classe 1 (Appareil à Laser de Classe 1).Le
client est responsable pour sélectionner et installer l'émetteur/récepteur de laser de classe 1 et pour
assurer que la classe 1 AEL (limite d'émission admissible) par EN/IEC 60825, CSA E60825-1, et Code
des règlements fédéraux 21 CFR 1040 ne soit pas dépassée après avoir installé l'émetteur/récepteur
de laser. Ne pas installer des appareils à laser dont la cote de classe est supérieure à 1.Voir toutes les
consignes de sécurité qui ont accompagné l'émetteur-récepteur avant l'installation. Seuls appareils
laser de classe 1 certifiés pour une utilisation dans le pays d’installation par l’organisme compétent
doivent être utilisées dans ce produit.
Important! Ultimate disposal of this product should be handled in accordance with all national laws and
regulations.
Aucune pièce réparable par l'utilisateur à l'intérieur. Confiez toute réparation à un technicien qualifié.
1.4 Safety Information
Refer to the Arista Networks document Safety Information and Translated Safety Warnings available at:
https://www.arista.com/en/support/product-documentation
1.5 Obtaining Technical Assistance
Any customer, partner, reseller or distributor holding a valid Arista Service Contract can obtain
technical support in any of the following ways:
•Email: [email protected]. This is the easiest way to create a new service request.
Include a detailed description of the problem and the output of “show tech-support”.
•Web:https://www.arista.com/en/support
A support case may be created through the support portal on our website. You may also download
the most current software and documentation, as well as view FAQs, Knowledge Base articles,
Security Advisories, and Field Notices.
•Phone: [phone] or [phone].
Important! No user serviceable parts inside. Refer all servicing to qualified service personnel.
Aucune pièce réparable par l'utilisateur à l'intérieur. Confiez toute réparation à un technicien qualifié.

Chapter 1: Overview Specifications
Quick Start Guide: 7500N Series Modular Switches 3
1.6 Specifications
Table 1-1 lists the specifications of Arista Data Center modular switches covered by this guide.
Table 1-1 Modular switch specifications
DCS-7504N DCS-7508N DCS-7512N DCS-7516N
Height 7RU: 312 mm (12.25
inches) 13RU: 578 mm (22.75 inches) 18RU: 801 mm (31.53 inches) 29RU: 1289 mm (50.75 inches)
Width 483 mm (19 inches)
maximum 483 mm (19 inches) maximum 483 mm (19 inches) maximum 483 mm (19 inches) maximum
Depth 795 mm (31.3 inches) 795 mm (31.3 inches) 849 mm (33.4 inches) 941 mm (37.1 inches)
Weight 222 lbs (101 kg) fully
loaded 400 lbs (182 kg) fully loaded 661 lbs (300 kg) fully loaded 1025 lbs (465 kg) fully loaded
DC Input Voltage
(per circuit)
-48/-60 V DC -48/-60 V DC -48/-60 V DC -48/-60 V DC,
DC Branch Circuit
Protection
100 A 100 A 100 A 100 A
AC Input Voltage
(per circuit)
200-240 V 200-240 V 200-240 V 200-240 V
AC Branch Circuit
Protection
20 A 20 A 20 A 20 A
Input Power Circuits 2 to 4 circuits 2 to 8 circuits 2 to 12 circuits 6 to 20 circuits
Ambient
Temperature
Storage Temperature
Relative Humidity
Altitude
0° to 40°C (32° to
104°F)
-40° to 70°C
(-40° to 158°F)
5 to 90%
0 to 3,000 meters
(0 to 10,000 feet)
0° to 40°C (32° to
104°F)
-40° to 70°C
(-40° to 158°F)
5 to 90%
0 to 3,000 meters
(0 to 10,000 feet)
0° to 40°C (32° to
104°F)
-40° to 70°C
(-40° to 158°F)
5 to 90%
0 to 3,000 meters
(0 to 10,000 feet)
0° to 40°C (32° to
104°F)
-40° to 70°C (
-40° to 158°F)
5 to 90%
0 to 3,000 meters
(0 to 10,000 feet)
Cooling See Power draw
configurations in
Table 1-2
See Power draw
configurations in
Table 1-2
See Power draw
configurations in
Table 1-2
See Power draw
configurations in
Table 1-2

4Quick Start Guide: 7500N Series Modular Switches
Specifications Chapter 1: Overview
Table 1-2.lists power specifications of modular switch components.
Table 1-2 7500N Series power specifications
Module Type Part Number
Power Draw (Typical /
{Hot}Maximum)
Supervisor Modules DCS-7500E-SUP
DCS-7500-SUP2
DCS-7516-SUP
47 W / 87 W
80 W / 120 W
88 W / 130 W
Line Card Modules DCS-7500E-36Q-LC
DCS-7500E-72S-LC
DCS-7500E-48S-LC
DCS-7500E-12CM-LC
DCS-7500E-6C2-LC
DCS-7500E-12CQ-LC
DCS-7500E-48T-LC
DCS-7500R-36CQ-LC
DCS-7500R-36Q-LC
DCS-7500R-48S2CQ-LC
DCS-7500RM-36CQ-LC
DCS-7500R2-18CQ-LC
DCS-7500R2-36CQ-LC
DCS-7500R2A-36CQ-LC
DCS-7500R2M-36CQ-LC
DCS-7500R2AM-36CQ-LC
DCS-7500R2AK-36CQ-LC
DCS-7500R2AK-48YCQ-LC
DCS-7500R-8CFPX-LC
DCS-7500R3-36CQ-LC
DCS-7500R3K-36CQ-LC
DCS-7500R3-24P-LC
DCS-7500R3-24D-LC
450 W / 556 W
212 W / 305 W
197 W / 285 W
408 W / 495 W
300 W / 320 W
414 W / 486 W
318 W / 332 W
758 W / 863W
368 W / 406 W
202 W / 220 W
944 W / 1040 W
313 W / 350 W
601 W / 654 W
830 W / 921 W
845 W / 941 W
963 W / 1085 W
830 W / 921 W
253 W / 276 W
900 W / 1180 W
410 W / 450 W
410 W / 450 W
538 W / 558 W
530 W / 550 W
Fabric Modules DCS-7504E-FM
DCS-7508E-FM
DCS-7504R-FM
DCS-7508R-FM
DCS-7512R-FM
DCS-7516R-FM
DCS-7504R3-FM
DCS-7508R3-FM
80 W / 105 W
155 W / 195 W
121 W / 163 W / 237 W
224 W / 298 W / 433 W
570 W / 680 W / 760 W
570 W / 770 W / 1053 W
220 W / 287 W
280 W / 387 W
Power Supply PWR-2700-DC-R (Fan Power)
PWR-3KT-AC RED (Fan Power)
PWR-3K-DC-RED (Fan Power)
43 W / 47 W
43 W / 47 W
43 W / 47 W
7504N Series System Full chassis loaded with
2 DCS-7500E-SUP
4 DCS-7504E-FM
4 DCS-7500E-36Q-LC
3150 W / 3400 W
Full chassis loaded with
2 DCS-7500-SUP2
4 DCS-7504R-FM
4 DCS-7500E-36CQ-LC
3500 W / 4500 W

Chapter 1: Overview Specifications
Quick Start Guide: 7500N Series Modular Switches 5
7508N Series System Full chassis loaded with
2 DCS-7500E-SUP
6 DCS-7508E-FM
8 DCS-7500E-36Q-LC
5500 W / 6400 W
Full chassis loaded with
2 DCS-7500-SUP2
6 DCS7508R-FM
8 DCS-7500E-36Q-LC
5820 W / 6880 W / 7750 W
Full chassis loaded with
2 DCS-7500-SUP2,
6 DCS7508R-FM
8 DCS-7500R-36CQ-LC
7720 W / 8990 W / 9880 W
Full Chassis loaded with
2 DCS-7500-SUP2
6 DCS-7508R-FM,
8 DCS-7500R-36Q-LC
4600 W / 5360 W / 6230 W
Full Chassis loaded with
2 DCS-7500-SUP2
6 DCS-7508R-FM
8 DCS-7500R-48S2CQ-LC
3270 W / 3900 W / 4740 W
Full Chassis loaded with
2 DCS-7500-SUP2
6 DCS-7508R-FM
8 DCS-7500RM-36CQ-LC
9100 W / 10300 W / 11000 W
Full Chassis loaded with
2 DCS-7500-SUP2
6 DCS-7508R-FM
8 DCS-7500R2-36CQ-LC
6400 W / 7300 W/ 7900 W
7512N Series System
Note: 7512N systems
support only 7500R and
7500R3 Series Line cards.
Full chassis loaded with
2 DCS-7500-SUP2,
6 DCS75012R-FM
12 DCS-7500R-36CQ-LC
12800 W / 14700 W / 15300 W
Full Chassis loaded with
2 DCS-7500-SUP2
6 DCS-7512R-FM
9 DCS-7500R-36CQ-LC
3 DCS-7500R-36Q-LC
11600 W / 13300 W / 13900 W
Full Chassis loaded with
2 DCS-7500-SUP2
6 DCS-7512R-FM
3 DCS-7500R-36CQ-LC
9 DCS-7500R-36Q-LC
9300 W / 10600 W / 11200 W
Full Chassis loaded with
2 DCS-7500-SUP2
6 DCS-7512R-FM
12 DCS-7500RM-36CQ-LC
14400 W / 16600 W / 18000 W*
Full Chassis loaded with
2 DCS-7500-SUP2
6 DCS-7512R-FM
12 DCS-7500R2-36CQ-LC
10200 W / 11800 W / 13200 W
Table 1-2 7500N Series power specifications (Continued)
Module Type Part Number
Power Draw (Typical /
{Hot}Maximum)

6Quick Start Guide: 7500N Series Modular Switches
Specifications Chapter 1: Overview
Note1: Includes typical power supply conversion inefficiency. Contact your local Sales Engineer for
7500 power calculator details.
Note2: Power numbers given as Typical/Maximum or Typical/Hot/Maximum where Hot is defined as
40°C Sea Level.
* Not N+N redundant power at worst case Temp/Elevation.
7516N Series System
Note: 7516N systems
support only 7500R Series
Line cards.
Full chassis loaded with
2 DCS-7516-SUP,
6 DCS7516R-FM
16 DCS-7500R-36CQ-LC
16 PWR-3KT-AC-RED
16000 W / 19000 W / 21000 W
Full chassis loaded with
2 DCS-7516-SUP,
6 DCS7516R-FM
16 DCS-7500R2-36CQ-LC
16 PWR-3KT-AC-RED
13500 W / 15600 W / 17500 W
Full chassis loaded with
2 DCS-7516-SUP,
6 DCS7516R-FM
16 DCS-7500RM-36CQ-LC
20 PWR-3KT-AC-RED
19000 W / 22000 W / 24000 W
Table 1-2 7500N Series power specifications (Continued)
Module Type Part Number
Power Draw (Typical /
{Hot}Maximum)

Quick Start Guide: 7500N Series Modular Switches 7
Chapter 2
Preparation
2.1 Site Selection
The following criteria should be considered when selecting a site to install the switch:
•Floor Space: Install the switch in an area that provides adequate clearance for removing front and
rear components.
Figure 2-1 displays the dimensions and footprint of the switch clearance requirements for the
switches.
Figure 2-1: Clearance requirements and footprint for switches
Table 2-1 shows the dimensions for each of the modular switches.
Table 2-1 Clearance requirements and footprint dimensions
Switch Clearance Requirements Dimensions
A B C
DCS-7504N 60 cm (24 in.) 88.6 cm (34.9 in.) 36.8 cm (14.5 in.)
DCS-7508N 60 cm (24 in.) 88.6 cm (34.9 in.) 36.8 cm (14.5 in.)
DCS-7512N 60 cm (24 in.) 94.0 cm (37.0 in.) 50.8 cm (20.0 in.)
DCS-7516N 60 cm (24 in.) 94.8 cm (37.3 in.) 50.8 cm (20.0 in.)

8Quick Start Guide: 7500N Series Modular Switches
Tools and Parts Required for Installation Chapter 2: Preparation
•Temperature and Ventilation: For proper ventilation, install the switch where there is ample
airflow to the front and back of the switch. The temperature should not go below 0° or exceed 40°C.
Important! To prevent the switch from overheating, do not operate it in an area where the ambient temperature
exceeds 40°C (104°F).
Pour empêcher l'interrupteur de surchauffe, ne pas utiliser il dans une zone où la température ambiante
est supérieure à 40°C (104°F).
•Airflow Orientation: The fans direct air from the front panel to the rear panel. Orient the front panel
toward the cool aisle.
•Rack Space Requirements: Table 2-2 shows the rack space requirements for each of the modular
switches.
Note The accessory kit provides the required mounting brackets or shelf for each switch.
•Power Requirements: Arista switches require a minimum number of operating power supplies in
the top section of all chassis, AC or DC and for each power domain of switches with multiple power
domains. Refer to Power Supply Specifications for more details regarding your switch.
Important! DC cables should be protected with circuit over-current protection devices and circuit disconnect
means. To power off a unit, power must be disconnected from ALL power cables.
DC câbles doivent être protégés avec dispositifs de protection de surintensité circuit et moyens de
déconnexion du circuit. Pour alimenter un appareil hors tension, l'alimentation doit être débranchée de
tous les câbles d'alimentation.
•Other Requirements: Select a site where liquids or objects cannot fall onto the equipment and
foreign objects are not drawn into the ventilation holes. Verify these guidelines are met:
• Clearance areas to the front and rear panels allow for unrestricted cabling.
• All front and rear panel indicators can be easily read.
• AC power cords can reach from the AC power outlet to the input connectors.
• DC power cables can reach from the DC power distribution unit to the input connectors.
2.2 Tools and Parts Required for Installation
The following tools are required to install a modular switch:
• Mechanical device capable of lifting chassis being installed (Table 1-1 on page 3).
Table 2-2 Rack space requirements
Switch
Rack or cabinet (standard 19" EIA)
2-post 4-post
Switch Height
(RU)
DCS-7504N Yes Yes 7
DCS-7508N Yes Yes 13
DCS-7512N No Yes 18
DCS-7516N No Yes 29

Chapter 2: Preparation Electrostatic Discharge (ESD) Precautions
Quick Start Guide: 7500N Series Modular Switches 9
• Torque reading nut driver (for DC power supplies)
• #2 Phillips head screwdriver
• Torque reading screwdriver using #2 Pozidriv or 1/4" flat bit (Needed for PWR-2700-DC-R)
Two-post and four-post rack mounts: Table 2-3 shows the rack components required for each of the
modular switches.
1 The accessory kit includes screws that fit many common equipment racks.
2 Rack nuts are only for racks with unthreaded, rack-post holes.
2.3 Electrostatic Discharge (ESD) Precautions
Observe these guidelines to avoid ESD damage when installing or servicing the switch.
• Assemble or disassemble equipment only in a static-free work area.
• Use a conductive work surfaces (such as an anti-static mat) to dissipate static charge.
• Wear an ESD wrist strap to dissipate static charge accumulation.
• Minimize handling of assemblies and components.
• Keep replacement parts in their original static-free packaging.
• Remove all plastic, foam, vinyl, paper, and other static-generating materials from the work area.
• Use tools that do not create ESD.
Table 2-3 Rack component requirements
Switch Rack or cabinet (standard 19" EIA)
Rack screws1Rack nuts2Notes
DCS-7504N 8 8 2-post installation
10 10 4-post installation
DCS-7508N 10 10 2-post installation
16 16 4-post installation
DCS-7512N 22 22 4-post installation
DCS-7516N 24 24 4-post installation

10 Quick Start Guide: 7500N Series Modular Switches
Electrostatic Discharge (ESD) Precautions Chapter 2: Preparation

Quick Start Guide: 7500N Series Modular Switches 11
Chapter 3
Rack Mounting the Switch
The accessory kit provides components for installing the switch in two-post and four-post racks.
•Section 3.1.1 provides instructions for mounting the switch in a two-post rack.
•Section 3.1.4 provides instructions for mounting the 7504N and 7508N switches in a four-post rack.
•Section 3.2 provides instructions for mounting the 7512N and the 7516N switches in a shelf
four-post rack.
The rack mounting procedure is identical for the 7504N and 7508N Series switches. Illustrations in this
chapter depict the mounting of an unpopulated 8-slot chassis.
The 7512N and the 7516N switches require a different mounting shelf, and only for the four-post rack.
Illustrations in this chapter depict the mounting of an unpopulated 12-slot chassis and a 16-slot chassis.
After completing the instructions for your rack type, proceed to Chapter 4.
3.1 7504N and 7508N Rack Mounting
3.1.1 Two-Post Rack Mount
To mount the switch to a two-post rack, assemble mounting brackets to the middle of the chassis, then
attach the brackets to the rack. The switch does not support a front or rear mount into a two-post rack.
The accessory kit includes the following two-post mounting parts:
• 2 center-mount brackets
• 20 M4x8 pan-head Phillips screws
3.1.2 Attaching Mounting Brackets to the Chassis
Step 1 Orient the switch chassis and the two center-mount brackets (Figure 3-1 on page 12).
Position the flanges that attach to the rack posts toward the rear of the chassis.
Step 2 Attach both center-mount brackets to the chassis. Each bracket requires ten M4x8 pan-head
Phillips screw.

12 Quick Start Guide: 7500N Series Modular Switches
7504N and 7508N Rack Mounting Chapter 3: Rack Mounting the Switch
Figure 3-1: Attaching the center-mount brackets
3.1.3 Inserting the Switch into the Rack
Step 1 Move the chassis to the rack using a mechanical lift.
If modules are inserted in the chassis, use the lift carefully to avoid damaging any components.
Step 2 Lift the chassis into the rack. Position the flanges against the rack posts (Figure 3-2).
Figure 3-2: Lifting the chassis into the two post rack
Step 3 Select mounting screws that fit your equipment rack.
1 Center mount brackets

Chapter 3: Rack Mounting the Switch 7504N and 7508N Rack Mounting
Quick Start Guide: 7500N Series Modular Switches 13
Step 4 A minimum of four screws is required on each side of the chassis. The accessory kit provides
screws that fit many common equipment racks. When installing the switch into a rack with
unthreaded post holes, nuts are also required to secure the switch to the rack posts.
Step 5 Attach the bracket flanges to the rack posts (Figure 3-3 on page 13). Space the screws evenly
along the flange.
Figure 3-3: Attaching flanges to the rack post
Step 6 After completing the two-post installation, proceed to Chapter 4.
3.1.4 Four-Post Rack Mount
The switch is mounted onto a four-post rack by assembling a shelf into the rack, then placing the switch
on the shelf.
Illustrations in this chapter depict the mounting of an unpopulated 8-slot chassis.
The accessory kit provides the following four-post mounting parts:
• 2 front brackets
• 4 shelf supports
• 2 back brackets (not needed for racks with threaded holes)
•leftshelf
• right shelf
Figure 3-4 on page 14 displays the front four-post mounting parts. Figure 3-5 on page 15 displays the
rear four-post mounting parts.
3.1.5 Assembling the Shelf
Step 1 Attach the front bracket and shelf support to the left front rack post, as shown in Figure 3-4 on
page 14. An up arrow is printed on the shelf support to indicate its proper orientation.
Unthreaded rack holes: Use the M6 screws and cage nuts supplied in the accessory kit.
Threaded rack holes: Attach the front bracket to the post with screws that can be threaded
through the rack post.
Step 2 Secure the shelf support to the post with nuts that fit the screws threaded through the post.

14 Quick Start Guide: 7500N Series Modular Switches
7504N and 7508N Rack Mounting Chapter 3: Rack Mounting the Switch
•7504N - Requires six M6 screws and cage nuts.
•7508N - Requires eight M6 screws and cage nuts.
Figure 3-4: Left front post assembly: Four post rack mount
Step 3 Repeat step 1 on the right front rack post, assembling the parts at the same vertical level as
those on the left rack post.
Step 4 Attach the shelf support and back bracket to the left rear post (Figure 3-5-left). The shelf
support must be assembled at the same vertical level on the front and rear posts. An up arrow
is printed on the shelf support to indicate its proper orientation.
Unthreaded rack holes: Attach the parts as displayed in Figure 3-5-left.
Threaded rack holes: Attach the shelf support to the post with screws that thread into the rack
post. The back bracket is not required on threaded racks.
1 M6 cage nut 4 M6 nut 7 Front bracket
2 M6 nut 5 M6 screw 8 M6 screw
3 Shelf support 6 M6 screw 9 Front rack post