Cable Installation

In some switch models, the product's package includes cable retainers. It is highly recommended to use them in order to secure the power cables in place.

When installing retainers for the PSUs of the SN3420 switch systems, please adhere to the following instructions:

  1. Verify the integrity of the retainer assembly, as demonstrated in the below table:- The snaps' push-pins must have visible edges with no broken or torn parts.
    - The shoulders' pins should be in-tact and must not be bent inwards.

    Proper Condition

    Improper Condition

    image2021-3-8_13-43-33-version-1-modificationdate-1615244918143-api-v2.png

    image2021-3-8_13-42-12-version-1-modificationdate-1615244918183-api-v2.png

  2. It is advised to place the PSU on a flat, stable surface. While you secure the PSU in place, use two thumbs to insert the retainer's two snaps into the designated holes located near the AC inlet. Make sure that the retainer's plastic loop is facing upwards, as demonstrated in the below table.

    Warning

    For demonstration purposes, the images in this document show C2P (Connector-to-Power) airflow PSUs with red latches, yet the instructions apply to P2C (Power-to-Connector) PSUs with blue latches as well.

    Correct Insertion

    Incorrect Insertion

    image2021-3-4_13-55-30-version-1-modificationdate-1615244918607-api-v2.png

    image2021-3-4_13-54-4-version-1-modificationdate-1615244918650-api-v2.png

  3. Push the retainer until the shoulders' pins (in blue circles below) are open and aligned with the PSU front panel, as shown in the following table:

    Fully Mated Retainer

    image2021-3-8_14-53-35-version-1-modificationdate-1615244918017-api-v2.png

    image2021-3-8_14-47-24-version-1-modificationdate-1615244918057-api-v2.png

  4. Make sure that the retainer is fully locked in place by gently attempting to pull it outwards.

  5. Open the plastic loop and route the AC cord through it. Locate the loop over the AC cord, as shown in the following table, and fasten it tightly.

    Proper Loop Placement

    Improper Loop Placement

    image2021-3-8_15-4-48-version-1-modificationdate-1615244917973-api-v2.png

    image2021-3-8_15-5-28-version-1-modificationdate-1615244917903-api-v2.png

Warning

Each cable retainer can be used once only. Once the retainer has been fully inserted and the shoulders' pins have been adjusted, the retainer cannot be used again, and should be discarded if pulled out.

All cables can be inserted or removed with the unit powered on.

To insert a cable, press the connector into the port receptacle until the connector is firmly seated. The LED indicator, corresponding to each data port, will light when the physical connection is established. When a logical connection is made, the relevant port LED will turn on.

To remove a cable, disengage the locks and slowly pull the connector away from the port receptacle. The LED indicator for that port will turn off when the cable is unseated.

For a list of Supported Cables and Transceivers, please refer to the SN3000 Systems Datasheet.

For full cabling guidelines, please refer to the NVIDIA Cable Management Guidelines and FAQ.

For more information about port LEDs, refer to Port LEDs.

Important

Do not force the cable into the cage with more than 40 newtons / 9.0 pounds / 4kg force. Greater insertion force may cause damage to the cable or to the cage.

QSFP Cable Orientation

image2018-11-13_15-50-48-version-1-modificationdate-1570470315387-api-v2.png

Splitter (Breakout) Cables and Adapters

The 100GbE ports in the SN3420 systems can be split to four (or less) 50GbE ports, using an NVIDIA splitter cable. See "SN3420 Splitting Options” below.

The 200GbE ports in the SN3700 systems can be split to two 100GbE ports, or to four (or less) 50GbE ports, using an NVIDIA splitter cable. See "SN3700 Splitting Options” below.

The 100GbE ports in the SN3700C systems can be split to two 50GbE ports, or to four (or less) 25GbE ports, using an NVIDIA splitter cable. See "SN3700C Splitting Options” below.

The 100GbE ports in the SN3750-SX systems can be split to to two 100GbE ports, or to four (or less) 50GbE ports, using an NVIDIA splitter cable . See "SN3750-SX Splitting Options” below.

The 200GbE ports in the SN3750-SX systems can be split to two 100GbE ports, or to four (or less) 50GbE ports, using an NVIDIA splitter cable. See "SN3750-SX Splitting Options” below.

Using Splitter (Breakout) Cables with NVIDIA Onyx (MLNX-OS)

When using this feature, you should log into the NVIDIA Onyx (MLNX-OS) CLI and configure the individual ports to be ‘split-2’ or ‘split-4’. For further information on NVIDIA’s cable, visit https://www.nvidia.com/en-us/networking/interconnect/.

Using Splitter (Breakout) Cables with Cumulus Linux

If you are using 4x10G direct attach copper cables or active optical cables, edit the /etc/cumulus/ports.conf to enable support for these cables, then restart the switchd service using the sudo systemctl restart switchd command. For more details, see Switch Port Attributes in the Cumulus Linux User Guide.

Examples of Splitter (Breakout or Fanout) Cables

image2018-11-12_16-34-27-version-1-modificationdate-1570470315137-api-v2.png


SN3420 Splitting Options

Ports 49-60 can be split to either two QSFP28 ports or four SFP28 ports. None of the ports are blocked.

image2020-4-23_17-38-40-version-1-modificationdate-1589999570450-api-v2.png

image2020-4-23_17-37-41-version-1-modificationdate-1589999570417-api-v2.png


SN3700 Splitting Options

All ports can be split to either 2 QSFP56 ports or 4 SFP56 ports. None of the ports are blocked.

image2020-1-15_10-26-18-version-1-modificationdate-1579115712870-api-v2.png


SN3700C Splitting Options

All ports can be split to either 2 QSFP28 ports or 4 SFP28 ports. None of the ports are blocked.

image2020-1-15_10-26-29-version-1-modificationdate-1579115712937-api-v2.png

SN3750-SX Splitting Options

All ports can be split to 2 QSFP28 ports or 4 SFP28 ports. None of the ports are blocked.

image2020-4-23_17-38-40-version-1-modificationdate-1589999570450-api-v2.png

image2022-11-24_15-20-37-version-1-modificationdate-1669587560577-api-v2.png

© Copyright 2023, NVIDIA. Last updated on Feb 20, 2024.