Arista 7500N Series User manual

Contents
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 Four-Post Rack Mount............................................................................................13
3.2 7512N and 7516N Shelf Rack Mount Installation................................................................ 17
3.2.1 Assembling the Shelf..............................................................................................18
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
4.5.1 Connecting the Ground to PWR-2700-DC-R Power Supply...................................29
4.5.2 Connecting the Power Cable Lug to the Terminal Studs........................................30
4.6 Power Supply Specifications................................................................................................32
4.7 Power Supply Configurations...............................................................................................32
4.7.1 Recommendations for Power Supply Usage..........................................................33
4.8 Power Supply Redundancy..................................................................................................33
4.9 Connecting Supervisor Cables.............................................................................................34
4.10 Connecting Line Card Modules and Cables.......................................................................37
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
iii

A.2 Line Card Module Indicators................................................................................................43
A.3 Fabric Status Indicators....................................................................................................... 44
A.4 Power Supply Status Indicators...........................................................................................45
Appendix B: Parts List..........................................................................47
B.1 Parts Used in All Rack Mount Configurations......................................................................48
B.1.1 Cables.....................................................................................................................48
B.1.2 Getting-Started Booklet.......................................................................................... 48
B.2 Two-Post Rack Mount Parts................................................................................................48
B.3 Four-Post Rack Mount Parts for 4-slot and 8-slot Chassis..................................................49
B.4 Four Post Rack Mount for 12-slot and 16-slot Chassis.......................................................51
Appendix C: Front Panel...................................................................... 53
Appendix D: Rear Panel....................................................................... 57
Appendix E: Line Cards........................................................................61
Appendix F: Maintenance and Field Replacement............................ 69
F.1 Power Supplies.....................................................................................................................69
F.1.1 Removing Power Supply Blank..............................................................................69
F.1.2 Removing AC Power Supply..................................................................................70
F.1.3 Installing AC Power Supply....................................................................................70
F.1.4 Removing DC Power Supply..................................................................................70
F.1.5 Installing DC Power Supply....................................................................................71
F.2 Fabric and Fan Module (Fabric Module)..............................................................................71
F.2.1 Removing Fabric Module Blank............................................................................. 71
F.2.2 Removing Fabric Module........................................................................................71
F.2.3 Installing Fabric Module..........................................................................................72
F.2.4 Removing Service Provider 7500N Series Fan and Safety Guard.........................72
F.3 Touch Point Shield (Optional)..............................................................................................72
F.3.1 Installing the Touch Point Shield............................................................................72
F.4 Supervisor Module................................................................................................................73
F.4.1 Removing Supervisor Module Blank...................................................................... 73
F.4.2 Removing Supervisor Module.................................................................................73
F.4.3 Installing Supervisor Module.................................................................................. 74
F.5 Linecards.............................................................................................................................. 74
F.5.1 Removing Linecard Blank.......................................................................................74
F.5.2 Removing Linecard.................................................................................................74
F.5.3 Installing Linecard...................................................................................................74
Appendix G: Taiwan RoHS Information..............................................75
iv

Chapter 1
Overview
The following topics are covered in this section:
•Scope
•Receiving and Inspecting the Equipment
•Installation Process
•Safety Information
•Obtaining Technical Assistance
•Specifications
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. Parts List provides a list of components included
with the switch.
1.3 Installation Process
The following tasks are required to install and use the switch:
1. Select and prepare the installation site (Site Selection).
2. Assemble the installation tools listed (Tools and Parts Required for Installation).
3. Attach the mounting brackets and install the switch in an equipment rack (7504N and 7508N Rack
Mounting and 7512N and 7516N Shelf Rack Mount Installation).
4. Connect the switch to the power source and network devices (Cabling the Power Supplies).
1

5. Configure the switch (Configuring the Modular Switch).
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.
L'élimination finale de ce produit doit être effectuée conformément à toutes les lois
nationales etrèglements.
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.
2

Overview
Aucune pièce réparable par l'utilisateur à l'intérieur. Confiez toute réparation à un technicien
qualifié.
1.6 Specifications
Modular Switch Specifications lists the specifications of Arista Data Center modular switches covered
by this guide.
Table 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 0° to 40°C (32° to 104°F) 0° to 40°C (32° to 104°F) 0° to 40°C (32° to 104°F) 0° to 40°C (32° to 104°F)
Storage
Temperature -40° to 70°C (-40° to 158°F) -40° to 70°C (-40° to 158°F) -40° to 70°C (-40° to 158°F) -40° to 70°C (-40° to 158°F)
Relative
Humidity 5 to 90% 5 to 90% 5 to 90% 5 to 90%
Altitude 0 to 3,000 meters
(0 to 10,000 feet) 0 to 3,000 meters (0 to 10,000 feet) 0 to 3,000 meters (0 to 10,000 feet) 0 to 3,000 meters (0 to 10,000 feet)
Cooling See Power draw
configurations in
Table 2: 7500N
Series Power
Specifications
See Power draw
configurations in
Table 2: 7500N
Series Power
Specifications
See Power draw
configurations in
Table 2: 7500N
Series Power
Specifications
See Power draw
configurations in
Table 2: 7500N
Series Power
Specifications
3

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

Overview
DCS-7508R3-FM 280 W / 387 W
PWR-2700-DC-R (Fan Power) 43 W / 47 W
PWR-3KT-AC RED (Fan
Power) 43 W / 47 W
Power Supply
PWR-3K-DC-RED (Fan
Power) 43 W / 47 W
Full chassis loaded with
2 DCS-7500E-SUP,
4 DCS-7504E-FM, 4
DCS-7500E-36Q-LC
3150 W / 3400 W7504N Series System
Full chassis loaded with
2 DCS-7500-SUP2,
4 DCS-7504R-FM, 4
DCS-7500E-36CQ-LC
3500 W / 4500 W
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
7508N Series System
Full Chassis loaded
with 2 DCS-7500-SUP2,
6 DCS-7508R-FM, 8
DCS-7500R2-36CQ-LC
6400 W / 7300 W/ 7900 W
5

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*
7512N Series System
Note: 7512N systems
support only 7500R
and 7500R3 Series
Line cards.
Full Chassis loaded with
2 DCS-7500-SUP2, 6
DCS-7512R-FM, 12
DCS-7500R2-36CQ-LC
10200 W / 11800 W / 13200 W
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
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-7500RM-36CQ-LC, 20
PWR-3KT-AC-RED
19000 W / 22000 W / 24000 W
* Not N+N redundant power at worst case Temp/Elevation.
Note: Includes typical power supply conversion inefficiency. Contact your local Sales Engineer
for 7500 power calculator details.
Note: Power numbers given as Typical/Maximum or Typical/Hot/Maximum where Hot is
defined as 40°C Sea Level.
6

Chapter 2
Preparation
The following topics are covered in this section:
•Site Selection
•Tools and Parts Required for Installation
•Electrostatic Discharge (ESD) Precautions
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 1: Clearance Requirements and Footprint for Switches displays the dimensions and footprint of
the switch clearance requirements for the switches.
Figure 1: Clearance Requirements and Footprint for Switches
Table 3: Clearance Requirements and Footprint Dimensions shows the dimensions for each of the
modular switches.
Table 3: Clearance Requirements and Footprint Dimensions
Clearance Requirements DimensionsSwitch
ABC
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.)
7

•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 4: Rack Space Requirements shows the rack space
requirements for each of the modular switches.
Table 4: Rack Space Requirements
Rack or Cabinet (standard 19" EIA)Switch
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
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 overcurrent 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 éteindre une unité, 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: Modular Switch
Specifications).
• 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).
8

Preparation
Two-post and Four-post Rack Mounts
Table 5: Rack Component Requirements shows the rack components required for each of the modular
switches.
Table 5: Rack Component Requirements
Rack or Cabinet (standard 19" EIA)Switch
Rack Screws 1Rack Nuts 2Notes
8 8 2-post installationDCS-7504N
10 10 4-post installation
10 10 2-post installationDCS-7508N
16 16 4-post installation
DCS-7512N 22 22 4-post installation
DCS-7516N 24 24 4-post installation
1The accessory kit includes screws that fit many common equipment racks.
2Rack 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.
9

10

Chapter 3
Rack Mounting the Switch
The following topics are covered in this section:
•7504N and 7508N Rack Mounting
•7512N and 7516N Shelf Rack Mount Installation
The accessory kit provides components for installing the switch in two-post and four-post racks.
•Two-Post Rack Mount provides instructions for mounting the switch in a two-post rack.
•Four-Post Rack Mount provides instructions for mounting the 7504N and 7508N switches in a four-
post rack.
•7512N and 7516N Shelf Rack Mount Installation 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 Cabling the Modular Switch.
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
3.1.1.1 Attaching Mounting Brackets to the Chassis
1. Orient the switch chassis and the two center-mount brackets (Figure 2: Attaching the Center-mount
Brackets).
Position the flanges that attach to the rack posts toward the rear of the chassis.
2. Attach both center-mount brackets to the chassis. Each bracket requires ten M4x8 pan-head
Phillips screws.
11

Figure 2: Attaching the Center-mount Brackets
1 Center mount brackets
3.1.1.2 Inserting the Switch into the Rack (7504N)
The rack mounting assembly is identical for all 7500N Series switches.
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.
2. Lift the chassis into the rack. Position the flanges against the rack posts. Figure 3: Lifting the
Chassis into the Two-post Rack.
Figure 3: Lifting the Chassis into the Two-post Rack
3. Select mounting screws that fit your equipment rack.
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.
5. Attach the bracket flanges to the rack posts (Figure 4: Attaching Flanges to the Rack Post). Space
the screws evenly along the flange.
12

Rack Mounting the Switch
Figure 4: Attaching Flanges to the Rack Post
6. After completing the two-post installation, proceed to Cabling the Modular Switch.
3.1.2 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)
• left shelf
• right shelf
Figure 5: Left front post assembly: Four post rack mount displays the front four-post mounting parts.
Figure 6: Left rear post assembly and shelf support orientation displays the rear four-post mounting
parts.
3.1.2.1 Assembling the Shelf (7504N and 7508N)
1. Attach the front bracket and shelf support to the left front rack post, as shown in Figure 5: Left front
post assembly: Four post rack mount. 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.
2. Secure the shelf support to the post with nuts that fit the screws threaded through the post.
7504N - Requires six M6 screws and cage nuts.
7508N - Requires eight M6 screws and cage nuts.
13

Figure 5: Left front post assembly: Four post rack mount
1 M6 cage nut 4 M6 nut 7 Front Bracket
2 M6 nut 5 Switch Bottom 8 M6 screw
3 Shelf support 6 Switch Top 9 Front rack post
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.
4. Attach the shelf support and back bracket to the left rear post (Figure 6: Left rear post assembly
and shelf support orientation). 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 following figures.
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.
14

Rack Mounting the Switch
1 Back bracket 4 M6 screw
2 M6 screw 5 Rear rack post
3 Shelf support
Figure 6: Left rear post assembly and shelf support orientation
1 Rear rack post
2 Front rack post
3 Shelf supports
5. Adjust the left shelf by sliding its components to fit between the front left and rear left rack posts, as
shown in Figure 7: Adjusting the left shelf.
6. Lift the left shelf above the shelf supports installed on the front left and rear left rack posts (Step 1
and Step 4). Align the holes and hook with the stubs on the brackets as shown in Figure 8: Both
switch shelves installed. Lower the shelf such that the bracket stubs are inserted into the shelf holes
and hook.
7. Press down firmly on the shelf to ensure it is seated securely on the rack posts.
8. Install the right shelf on the right front and right rear rack posts by repeating Step 5 and Step 6 to
obtain the rack configuration shown in .
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Figure 7: Adjusting the left shelf
1 Rear rack post
2 Left shelf
3 Front rack post
Figure 8: Both switch shelves installed
1 Left shelf
2 Rear rack post
3 Right shelf
4 Front rack post
3.1.2.2 Inserting the Switch into the Rack (7508N)
The rack mounting assembly is identical for the 7504N and 7508N switches. Illustrations in this chapter
depict the mounting of an unpopulated 8-slot chassis.
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