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.)
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.
 
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
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).
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.
 
Table 2-3 Rack component requirements
Switch
Rack or cabinet (standard 19" EIA)
Rack screws1
Rack nuts2
Notes
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
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.