The accessory kit provides components for installing the switch in four-post racks. The accessory kit includes the following four-post mounting parts:

• Cradle assembly
• M6 pan-head Phillips screws
• M6 rack cage nuts (optional)
• Template for non-threaded racks requiring rack nuts

   

  Note: Two-post rack mount is not supported.

   

Illustrations in this chapter depict the mounting of an unpopulated 8-slot chassis.

After completing the instructions for your rack type, proceed to Cabling the Power Supplies.

Rack mounting the switch in a four-post rack requires the following tasks:

• Inserting rack nuts (for racks requiring them) at appropriate locations. (Inserting Rack Nuts Using the Template).
• Inserting and securing the cradle assembly into the rack (Inserting and Securing the Cradle Assembly).
• Inserting the switch into the rack (Inserting the Switch into the Rack).

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.

The Figure 1 displays the dimensions and footprint of the switch clearance requirements for the switches.

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

• 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: The Table 2 shows the rack space requirements for each of the modular switches.

  Table 2. Rack Space Requirements

  Switch	Rack or Cabinet (standard 19" EIA)
  	2-Post	4-Post	Switch Height (RU)
  DCS-7804	No	Yes	10
  DCS-7808	No	Yes	16
  DCS-7812	No	Yes	23
  DCS-7816	No	Yes	32

  Note: The accessory kit provides the required mounting hardware for each switch.

   

• Power Requirements: Arista switches require a minimum number of operating power supplies in all chassis, AC or DC, and for each power domain of switches with multiple power domains. Refer to Cabling the Power Supplies 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 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. Ensure 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

The DCS-7816 accessory kit includes bolts and lifting brackets (Figure 2) that must be attached to the top of the chassis with the bolts supplied for lifting the chassis from the pallet onto the transport lift. You can use any appropriate lifting mechanism/tool to unload the switch. A platform lift is recommended for transportation and installation of the switch. The rack mounting cradle is shipped nested upside down over the top of the chassis for all switches (Figure 3). There is a protective film on the top and sides to keep the cradle from scratching the chassis during transport.

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.

This guide is intended for properly trained service personnel and technicians who need to install the following Arista Networks Data Center Switches:

• DCS-7804
• DCS-7808
• DCS-7812
• DCS-7816

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 DCS-7800 Series Modular Switches purchase order. Parts List provides a list of components included with the switch.

Refer to the Arista Networks document Safety Information and Translated Safety Warnings available at https://www.arista.com/en/support/product-documentation.

Any customer, partner, reseller or distributor holding a valid Arista Service Contract can obtain technical support in any of the following ways:

• Email:This email address is being protected from spambots. You need JavaScript enabled to view it.. 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: +1 866-476-0000 or +1 408-547-5502.

The Table 1 lists the specifications of Arista Data Center modular switches covered by this guide.

_{1. For non-redundant power feeds, 12 to 16 for redundant power feeds.}

_{2. For non-redundant power feeds, 16 to 24 for redundant power feeds.}

_{3. For non-redundant power feeds, TBD for redundant power feeds.}

_{4. For non-redundant power feeds, 24 to 48 for redundant power feeds.}

The Table 2 lists power specifications of modular switch components.

_{¹ With no input power.}

_{^{Note 1} Includes typical power supply conversion inefficiency. Contact your local Sales Engineer for 7800 power calculator details.}

_{^{Note 2} 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.}