Powering the Modular Switch

The switch operates with multiple power supplies. The following table lists the quantity of modules each chassis can contain and the minimum operating requirements for each model.

Important:

Installation of this equipment must comply with local and national electrical codes. If necessary, consult with the appropriate regulatory agencies and inspection authorities to ensure compliance.

 

Installation de cet équipement doit être conformes aux codes électriques locaux et nationaux. Si nécessaire, consulter les organismes de réglementation appropriés et des autorités de contrôle pour assurer la conformité.

 

Table 1. Power Supply Capacity and Requirements for 7388X5 Series Modular Switches
Switch Model Chassis Capacity

(Power Supply Units)

 Minimum Operating Requirements

(non-redundant power)
DCS-7388X5 4 1 active circuit
Important:

Each power supply requires input branch circuit protection in compliance with AHJ requirements.

 

Chaque alimentation nécessite une protection du circuit de la branche d’entrée conformément aux exigences de l’AHJ.

 

The power supplies are located on the Rear Panels of the switch. Unpopulated power supply bays must be covered using the appropriate “blank” for the switch.

This chapter includes sections that describe procedure for grounding and cabling power supplies. After completing the instructions for your switch, proceed to Connecting Serial and Management Cables.

Important:

Read all installation instructions before connecting the system to the power source.

Lire toutes les instructions d'installation avant de brancher le système à la source d'alimentation.

 

  • Non-Redundant Configuration: Provide power to the minimum required power inputs.
  • Redundant Power Supply Configuration: Connecting power to modules in excess of minimum requirements protects the switch against failed modules and can provide grid-level redundancy.
  • Power down the Switch: Remove all power cords from the power input sockets.
Important:

This equipment must be grounded. Never defeat the ground conductor. This unit requires over-current protection.

 

Cet équipement doit être mis à la terre. Ne jamais modifier le conducteur de terre. Cet appareil nécessite de protection contre les surintensités.

Cabling the AC Power Supply

Grounding the Switch

After mounting the switch into the rack, connect the switch to the data center ground. The following figure displays the location of the grounding pads located on the rear of the switch.

Figure 1. Grounding location and ESD attach points (rear)
1 Switch Card Module Release Handle 4 Fan Module Release 7 PSU Release
2 Switch Card Module Release Buttons 5 Fan Status LED 8 PSU
3 Fan 6 PSU Status LED 9 Ground
Important:

Grounding wires and grounding lugs (M4 x 0.7) are not supplied. Wire size should meet local and national installation requirements. Commercially available 6 AWG wire is recommended for installations in the U.S.

 

À la terre et de mise à la terre fils cosses (M4 x 0.7) ne sont pas fournis. Calibre des fils doit satisfaire des exigences de l’installation locale et nationale. Disponible dans le commerce des câbles 6 AWG sont recommandé pour les installations aux États-Unis.

 

After the switch is grounded, ESD wrist straps can be grounded by connecting them to the ESD port on the front of the switch.

Figure 2. Grounding location and ESD attach point (Front)
1 ESD attach point 3 Supervisor and Linecard Ejector Handle (Release) and Button 5 Pull Tag (for Switch Information)
2 Supervisor Module 4 Torque Clutch Removal Tool 6 Linecard

Connecting Power Cables to an AC Power Supply

The following figure displays an AC power supply module, including the power input socket.

Figure 3. Power Input Sockets
1 Power Supply Status LED

The power supplies require a SAF-D cable for connection.

To insert a power cable:

  1. Pull the retaining clip back on each power input socket.
    Note: The retaining clip is optional (if provided).

     

  2. Plug the power cables into the sockets.
  3. Adjust the retaining clips if needed for your power cords (if retaining clip was provided).
  4. Push the retaining clip back down over the cable (if retaining clip was provided).

DC Power Supplies

The following DC power supplies are supported.

  • PWR-2411-DC-RED
  • PWR-2421-HV

The following image displays the DC power supply.

Figure 4. DC Power Supply Examples
1 Power Supply Status LED 4 RTN (Battery return) Terminal 7 Plastic Cover
2 -48V Terminal 5 Protective Earth Terminal    
3 Release 6 Plastic Cover Handle    
Important:

A disconnect device must be provided as part of the installation.

 

Un dispositif de sectionnement doit être fourni dans le cadre de l'installation.

 

Important:

Ensure power is removed from DC circuits before performing any installation actions. Locate the disconnect device, circuit breakers or fuses on DC power lines servicing the circuits. Turn off the power line circuits or remove the fuses.

 

Pouvoir assurer qu'il est retiré de circuits DC avant d'effectuer des actions d'installation . Localiser les disjoncteurs ou des fusibles sur les lignes de courant continu desservant les circuits. Coupez les circuits de lignes d'alimentation ou retirer les fusibles.

 

Important:

Wire size must comply with local and national requirements and electrical codes. Use only copper wire.

 

Le calibre du fil doit être conforme aux exigences locales et nationales et les codes électriques. Utiliser du fil de cuivre.

 

Important:

Apply ground connection to the switch first during installation and remove last when removing power.

 

Appliquer connexion à la terre à l'interrupteur premier lors de l'installation et de supprimer la dernière alimentation lors du débranchement.

Wire and Lug Preparation

Before performing any installation actions, ensure power is removed from DC circuits by turning off the power line servicing the circuits. Prepare the stranded wiring before you begin a DC power installation.

Note: Stranded copper wiring is required and should meet local and national installation requirements. Wires and grounding lugs are not supplied.

 

  1. Attach an ESD grounding strap.
  2. Prepare the stranded copper wiring for the power supply to be used. The following table provides wiring, lug, and tightening torque information for the power supplies covered in this guide.
    Table 2. Wiring, Lug, and Tightening Torques for DC PSUs
    PSU Wire Size(1) Lug Type(2) Tightening Torque
    (AWG) (mm2) N•m in.•lbs.
    PWR-2411-DC 2 - 4 35.0 - 25.0   2.7 24

    1 Unless otherwise noted, wire size applies to -48V, Battery return, and Protective earth wires.

    2 Unless otherwise noted, twin #10 studs spaced for dual-hole lug with 5/8" hole spacing.

     

  3. Strip the wires to the appropriate length for the lugs to be used.
  4. Slip on heat-shrink tubing on the wire ends before assembling the lugs on to the wire.
  5. Crimp the lugs with the proper tool, and ensure that the tubing extends over the barrel of the lugs and the insulation on the wires.
  6. Use agency-approved compression (pressure) lugs for wiring terminations.
  7. Shrink the tubing with a heat gun.
Figure 5. Lug Preparation
1 Insulated wire 2 Heat-shrink tubing 3 Lug
A 1/4” B 1/2” C 5/8”

 

Note: Dimension B is the width of the lug (not visible on the right angle lug).

Connecting a DC Power Supply to Power Source

To connect a DC power supply to a power source, perform the following:

  1. Prepare the stranded wiring (Wire and Lug Preparation).
  2. Attach the appropriate lugs to the source DC wires.
  3. Connect the DC-input wires to the appropriate terminals using the specified torque in the following order.
    Note: Remove terminal covers as needed.

     

    1. Ground wire to the Protective Earth (PE) terminal.
    2. Negative source DC cable to the negative (-48V) terminal.
    3. Positive (+) source DC cable to the positive (RTN) terminal.

       

  4. Replace the terminal covers as required.
    Note: The ground (protective earth) terminal is on the opposite side from the other two terminals.

Rack Mounting the Switch

The switch must be mounted in a four-post rack. Perform the following tasks to mount the switch.

  • Attach the left and right shelf to the rack, adjusting the length of the shelves as needed. You must allocate 4RU rack space starting from the top of the shelf for switch placement (Shelf Installation).
  • Attach the rack mounting ears to the switch (Mounting Ears Installation).
  • Insert the switch and secure it to the rack (Switch Insertion into Rack).
Note: Components are designed for tool-less installation in square-hole racks.

Shelf Installation

 

The four-post mount accessory kit contains these components:

  • Left Shelf and Right Shelf

  • Rack mounting ears

Follow the steps listed below to attach the shelves to the rack.

Note: Illustrations use a representative 4 RU chassis.

 

  1. Extend the sliding end of each shelf so that it can be placed on the rack.
    Figure 1. Attaching Shelves to the Rack (Right Shelf Shown)

     

  2. Move the sliding end of each shelf so that the shelf fits snug and level on to the rack and secure the shelves using the screws to the rack. (Figure 3-2-left and Figure 3-2-right).
    Note: You must ensure that the shelves are installed at the same level in the rack.

     

    Figure 2. Adjusting Shelves to Fit onto the Rack (Right Shelf Shown)

     

    Figure 3. Switch Shelves Installed

Mounting Ears Installation

 

The following figure shows the rack mounting ears, which secure the switch top to the rack. Attach the two rack mounting ears to each side of the switch. The inner side of each ear may include a latch to the locking mechanism that secures the ear to the rack. The two rack mounting ears are identical and will attach to the switch such that the securing screws are on the outside of the switch as shown.
Figure 4. Rack Mounting Ears

Switch Insertion into Rack

 

Use a lift to raise and align the switch with the installed shelves and insert the rollers on the rack mount ears into the shelves' channels. Push and slide the switch into the rack to secure.
Note: The rack mounting ears use only the top two rack units but you must allocate four rack units from the top of the shelves for the switch.

 

Figure 5. Inserting the Switch

 

 

Figure 6. Securing the Switch

Preparation

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.The following diagram provides switch clearance requirements.

Figure 1. Switch Component Removal Footprint

Table 1. Clearance requirements and footprint dimensions
Dimension DCS-7388X5
A 25.4 cm (10 inches)
B 66.0 cm (26.0 inches)
C 55.9 cm (22.0 inches)
  • 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: Determine airflow direction of the fan modules and power supply modules. Fan and power supply module handles indicate airflow direction.

    Note: All power supplies may not be supported by the switch configuration you have.

     

     

  • Rack Space: Install the switch in a 19" rack or cabinet. The switch height depends on the switch model, as specified in Specifications. Verify that the removal clearances provide adequate space for the power and data cables that connect to the switch.

    When mounting the switch in a partially filled rack, load the rack from bottom to top, with the heaviest equipment at the bottom. Load the switch at the bottom if it is the only item in the rack.

    The accessory kit provides mounting brackets for four-post racks. Two-post mounting racks are not supported.

     

    Important:

    All power input plug-socket combinations must be accessible at all times; they provide the primary method of disconnecting power from the system.

    Toutes les combinaisons de fiche-prise d’entrée de puissance doivent être accessibles en tout temps; ils fournissent le principal moyen de coupure d’alimentation du système.

     

     

  • Power Requirements: Power requirements vary by switch. Refer to Table 1 - DCS-7388X5 Modular Switch and Component Specifications and Table 2 - 7388 Modular Switch and Component Power Specifications for information regarding your specific system.

    Multiple circuits provide redundancy protection. The switch power supply has a Saf-D connector.

     

  • 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 connectors on the front panel.
Important:

Disconnecting power to all input sockets is required to completely power off the unit.

Coupure d’alimentation sur toutes les entrées il faut pouvoir complètement l’appareil hors tension.

Tools Required for Installation

 

Each switch provides an accessory kit that contains parts for installing the switch into a four-post rack. Two-post rack mount parts are available through your sales representative. Accessory kits do not include screws, nuts, or bolts for attaching the switch to a conventional rack.

In addition to the accessory kit, the following tools are required to install a modular switch:

All Racks

Four-Post Tool-less Rack

No additional equipment required.

Four-Post Conventional Rack
  • Screws or rack mounting nuts and bolts.
  • Screwdriver.

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 antistatic 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.
  • Select tools that do not create ESD.

Overview

Scope

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

  • DCS-7388X5
Important:

Only qualified personnel should install, service, or replace this equipment.

 

Seul le personnel qualifié doit installer, service, ou remplacer cet équipement.

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 order for a list of components included with the switch.

Safety Information

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

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 6-825, 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 must 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.

 

The fabric module requires special handling when removing, inserting, or handling the component. Appendix F provides instructions for handing fabric modules.

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: 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.
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.

Specifications

The following table lists specifications of Arista Data Center modular switches and components covered by this guide.

Table 1. DCS-7388X5 Modular Switch and Component Specifications
Attribute Specification
Height 4 RU: 174 mm

(7.0 inches)
Width 440 mm

(17.3 inches)
Depth 680 mm

(26.8 inches)
Weight: Fully Loaded 49.4 kg

(109 lbs)
Input Power (per circuit)  
AC Power 200 - 277 VAC, 13.5 A (200 VAC), 50 or 60 Hz
DC Power -40 VDC to -72 VDC, 42 A (-48 V)1

240 VDC to 380 VDC2
Branch Circuit Protection  
AC Power 20 A
Input Power Circuits 2 to 4 circuits
Operating Temperature 0° to 40°C

(32° to 104°F)

Storage Temperature

 -40° to 70°C

(-40° to 158°F)
Operating Altitude 0 to 3,000 meters

(0 to 10,000 feet)
Relative Humidity 5 to 90%
Cooling 2000 W maximum
  • 1: (PWR-2411-DC-RED)
  • 2: (PWR-2421-DC-HV)

 

 

The following table lists power specifications of modular switch components.

Table 2. 7388 Modular Switch and Component Power Specifications
Module Type Part Number Power Draw: Typical / Maximum
Supervisor DCS-7388-SUP

DCS-7388-SUP-D

 33 W / 53 W
Linecard DCS-7388-16CD

DCS-7388-16CD2

 2.2 W1 / 4.4 W2
DCS-7388-8DR 17 W1 / 39 W2
DCS-7388-8D 142 W1 / 161 W2

Switch Card (excluding fans)

 DC-7388X5-SC 372 W / 457 W
Power Supplies PWR-2421-HV  
PWR-2411-DC-RED  
7388 Series System Full chassis loaded with

1x DCS-7388-SUP-D supervisor

1x DC-7388X5-SC switch card

8x DCS-7388-8D linecards

5x Fans

2x PWR-2401-AC power supplies

 3458 W2
  • 1: Excluding optics.
  • 2: With 15 W optics.

Quick Start Guide
7388X5 Series Modular
Data Center Switches
Arista Networks

www.arista.com

DOC-05054-03

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