Cabling the Switch

The following topics are covered in this section:

Grounding the Switch

After mounting the switch into the rack, connect the switch to the data center ground. Figure 4-1 displays the location of the grounding lug on the front, left mounting ear for the DCS-7020SR-32C2

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 6 fils AWG est recommandé pour les installations aux États-Unis.

Figure 1. Earth Grounding Pad Sockets for DCS-7020SR-32C2
1 Ground lug 6 ESD
2 Blue handle indicates forward airflow 7 Console (Serial) port
3 Ethernet management port 8 USB port
4 System status LED 9 Power supply 2 status LED
5 Fan status LED 10 Power supply 1 status LED

Connecting Power Cables

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.

The switch operates with two installed power supplies. At least one power supply must connect to a power source. Two circuits provide redundancy protection.

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: Connect power to either of the two power supplies.
  • Redundant Power Supply Configuration: Connect power to both power supplies.
  • Power down the Switch: Remove all power cords and wires from the power supplies.
    Important:

    This equipment must be grounded. Never defeat the ground conductor.

    Cet équipement doit être mis à la terre. Ne jamais modifier le conducteur de terre.

    Important:

    This unit requires overcurrent protection.

    Cet appareil requiert une protection contre les surintensités.

AC Power Supplies

The PWR-400AC power supply is supported.

Figure 2 displays an AC power supply. It connects to a circuit that provides the required power, as specified by Table 5.

Figure 2. AC Power Supply (PWR-400AC)

1 Power Supply Handle 3 Power Supply Status LED
2 Power Supply Release Lever    

The power supply requires power cables that comply with IEC-320 and have a C13 plug. The accessory kit provides two IEC-320 C13 to C14 power cables.

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.

DC Power Supplies

The PWR-400-DC power supply is supported.

The following figure displays a PWR-400-DC power supply. It connects to a circuit that provides the required power, as specified by Table 5.

Figure 3. DC Power Supply (PWR-400-DC)
1 Status LED 3 PSU Handle 5 Release lever
2 Ground terminal 4 Terminals    
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. Table 1 provides wiring, lug, and tightening torque information for the power supplies covered in this guide.
    Table 1. Wiring, Lug, and Tightening Torques for DC PSUs
    PSU Wire Size (1) Lug Type Tightening Torque
    (AWG) (mm 2) N • m in. • lbs.
    PWR-400-DC 10 - 12 6.0 - 4.0 M3.5 - single hole 1.0 9

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

  3. Strip the wires to the appropriate length for the lugs to be used.
  4. Use agency-approved compression (pressure) lugs for wiring terminations.
  5. Slip on heat-shrink tubing on the wire ends before assembling the lugs on to the wire.
  6. 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 (Figure 4).
    Figure 4. Lug Preparation (two-hole lug shown)
    1 Insulated wire 3 Lug B 1/2"
    2 Heat-shrink tubing A 1/4" C 5/8"
  7. Shrink the tubing with a heat gun.

Connecting a DC Power Supply to Power Source

To connect a DC power supply to power source:
  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 (Table 1) 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.

       

      Important:

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

      Assurez-vous de pouvoir retirer des circuits en courant continu avant d’effectuer toute action d’installation.Localiser les disjoncteurs ou fusibles sur les lignes électriques DC entretien des circuits. Mettez hors tension le circuit ligne ou retirer les fusibles.

      Important:

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

      Calibre doit respecter les exigences locales et nationales et les codes de l’électricité. Utiliser seulement du fil de cuivre.

      Important:

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

      Appliquer le motif connexion tout d’abord pendant l’installation et supprimer dernière lors du retrait de puissance.

  4. Replace the terminal covers as required.

Connecting Serial and Management Cables

The accessory kit includes the following cables:
  • RJ-45 to DB-9 serial adapter cable.
  • RJ-45 Ethernet cable.

Table 2 lists the pin connections of the RJ-45 to DB-9 adapter cable.

Table 2. RJ-45 to DB-9 Connections
RJ-45 DB-9 RJ-45 DB-9
RTS 1 8 CTS GND 5 5 GND
DTR 2 6 DSR RXD 6 3 TXD
TXD 3 2 RXD DSR 7 4 DTR
GND 4 5 GND CTS 8 7 RTS

 

Note: RJ-45 to DB-9 connections: RJ-45 pin 1 (RTS) is connected to RJ-45 pin 8 (CTS); RJ-45 pin 2 (DTR) and RJ-45 pin 7 (DSR) are not electrically connected to any signal.

 

Figure 5 display the management, console, and USB ports on the front panel.

Figure 5. Management Ports

1 Link status LED 4 USB port
2 Activity status LED 5 Serial (console) port
3 Ethernet Management port    
Connect the ports as follows:
  • Console (Serial) Port: Connect to a PC with the RJ-45 to DB-9 serial adapter cable. The switch uses the following default settings:
    • 9600 baud
    • No flow control
    • 1 stop bit
    • No parity bits
    • 8 data bits
  • Ethernet Management Port: Connect to 10/100/1000 management network with RJ-45 Ethernet cable.
  • USB Port: The USB port may be used for software or configuration updates.
    Note: The DCS-7020SR-32C2 chassis has other ports labeled as Alarm, Clk in, Clk Out and ToD. These ports are not supported. Do not connect any cables to these ports
    CAUTION:

    Excessive bending can damage interface cables, especially optical cables.

    Flexion excessive peut endommager les câbles d’interface, notamment des câbles optiques.