Preparation

The following topics are covered in this section:

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 displays the dimensions and footprint of the switch clearance requirements for the switches.

Table 1 shows the dimensions for each of the modular switches.

Table 1. Clearance Requirements and Footprint Dimensions
Switch	Clearance Requirements Dimensions
Switch	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 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 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.

The following tools are required to install a modular switch:

Mechanical device capable of lifting chassis being installed (Table 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).

Table 3 shows the rack components required for each of the modular switches.

_{¹The accessory kit includes screws that fit many common equipment racks.}

_{²Rack nuts are only for racks with unthreaded, rack-post holes.}

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.