In this section:
The DSC Platform must be installed in restricted access areas (dedicated equipment rooms, equipment closets, or the like) in accordance with Articles 110-26, 110-27 of the National Electric Code ANSI/NFPA70, or per the applicable code in the country of installation.
It is recommended that you prepare the site in the order of the topics as they appear on the page.
It is recommended that you also review DSC 8000 Specifications for mechanical, electrical, and environmental specifications before proceeding with the installation.
Verifying Rack Mounting Requirements
DSC Platform shelves are intended for stationary mounting in the DSC Platform cabinet, that is, designed to meet the physical strength requirements of NEBS GR-63-CORE or GR-487-CORE. This cabinet is not included with the DSC 8000 and should be ordered separately. For information about ordering the cabinet, contact Ribbon Sales (refer to Sales).
The DSC Platform is deployed with the Power Distribution Unit (PDU, see Figure Mapping of TPA and GMT Fuses to Power Modules and Alarm Panel, Respectively) and the alarm panel installed (see Alarm Panel Connections). The control and expansion shelves are deployed in separate shipping containers [see Figure Control Shelf (Front View)]. The shelf brackets are installed in the rack. You can install the shelves as required; however, it is recommended that you place the control shelf directly under the PDU. You can identify the control and expansion shelves by the labeling on these shelves.
The information in this section is provided only as a guideline for mounting the shelves in the cabinet rack. It is recommended that this activity be performed according to the local code of the installation site and the completed installation be inspected by qualified local authorities.
- Rack-mounting the shelves requires three people. Two people should hold the chassis and position it in the rack and a third person should secure the chassis to the rack using the attachment screws. These screws are not provided.
- Make sure that the rack has the proper heat dissipation requirements (see 325020107).
- Make sure that there is sufficient space around the cabinet for servicing the DSC Platform.
Verifying Cabinet Requirements
The DSC Platform cabinet installation must meet the GR63-CORE or equivalent standard. The installation, including floor preparations with the appropriate installation safety guidelines, must also be performed according to local code of the installation site and the completed installation must be inspected by the qualified local authorities.
The DSC Platform weighs 443 kg (977 lbs) with four shelves populated. The site floor (concrete or raised) where the DSC Platform is installed must be engineered to accommodate this weight.
The hardware that is required for installing the cabinet is typically provided by the cabinet manufacturer.
Verifying Electrostatic Discharge Requirements
This system contains card-level components that must be protected from electrostatic discharge. Wear an ESD wrist strap grounded through one of the DSC Platform electrostatic discharge (ESD) ground jacks when handling system components.
The DSC Platform is deployed with a protective plastic on the system shelves. This plastic is antistatic, and typically, is tinted pink to indicate this characteristic. Electrostatic (ESD) ground jacks are located at the front and rear of the system (see the following figures). To protect all system components from static shock when handling them, wear an ESD wrist strap plugged into the most easily accessible ESD ground jack on the respective shelf.
However, you cannot connect the ESD wrist strap to the DSC Platform ESD ground jacks until the system is properly grounded. Hence, make sure that you remove the protective plastic from DSC Platform shelves in a location where you have access to a facility ESD ground jack (for example an already grounded rack) to which you can connect the ESD wrist strap before removing this plastic. It is also recommended that after you remove the plastic, place the shelf on an antistatic mat or foam until it is time to install this shelf in the rack.
Typical DSC 8000 Shelf with Ground Jack (Front View)
Typical DSC 8000 Shelf with Ground Jack (Rear View)
To connect the grounding wrist strap to a ground jack
- Fasten the ESD wrist strap (not provided) to your wrist.
- Insert this wrist strap’s connector to the most accessible functioning ESD ground jack on the shelf.
- Wrap the grounding wrist strap end around your wrist.
- Attach the grounding end, usually a piece of copper foil or an alligator clip, to one of the ESD ground jacks.
Verifying Cooling Requirements
Each shelf in the DSC Platformis designed to cool in excess of the 2,200 W maximum power consumption rating.
The actual cooling requirements are determined by the individual platform configuration.
The maximum ambient temperature at which a factory-configured DSC Platform platform should operate long term is 40°C at 5% to 85% relative humidity (refer to DSC 8000 Specifications). If the platform is installed with its ventilation intakes near another system's exhaust or in a closed or multi-unit rack assembly, the operating ambient temperature inside the enclosure may be greater than the room's ambient temperature. Install the platform in an environment compatible with this recommended maximum ambient temperature. Due to the modular design of the platform, components may be installed that alter the platform's operating requirements.
Safe operation of the DSC Platform is dependent on the 250 LFM/slot of forced-air cooling provided by the platform's cooling fans. Make sure to install the platform in an environment that does not compromise this recommended minimum airflow requirement.
To maintain proper airflow, the clearance in front of the DSC Platform cabinet must be minimum 91cm (3 feet) and the rear of the cabinet 61cm (2 feet). Otherwise, airflow can become restricted. Restricted airflow can cause the system to overheat; overheating can lead to equipment failure.
Any empty slots in a shelf are covered with air management blades (front and rear) before deployment. If, for any reason, you remove any of the system cards from a live platform, immediately cover the empty slot. To purchase additional air management blades, contact Global Product Support.
Failure to cover open slots can cause overheating of power supplies, cards, or other components, and could damage the platform.
It is recommended that you use the Air Management Blades specified in System Cards for covering unpopulated front and rear slots in the DSC Platform shelves.
For more information about system cooling, see Cooling Architecture and refer to DSC 8000 Specifications.
Verifying Ground Requirements
The equipment rack must be grounded in accordance with Article 250 of the National Electrical Code (NEC), and with any other national or local safety codes and practices that apply in your area. Cable size, type, color, and termination listed in this guide is provided only as guidance and may differ form the codes that apply in your location.
The chassis may have high leakage current with multiple external communication connections. Earth connection is recommended before connecting the power supply or communication cables.
The PDU, control and expansion shelves, the rack/cabinet and cabinet doors are to be connected to the grounding bar that is installed in the cabinet and the grounding bar is connected to the protective earth wire in the building (see Grounding the DSC 8000).
The building installation is to provide a means for connection to protective earth and the DSC Platform is to be connected to this protective earth. The site Service/Maintenance person can arrange for the installation of a protective earthing conductor from the DSC Platform grounding bar protective earthing terminals (see Connecting the Grounding Bar to the Facility Ground) to the protective earth wire in the building.
Always make sure that the installation screws are properly tightened and the cable connectors are properly seated.
For more information about grounding the DSC Platform, refer to Grounding the DSC 8000.
Verifying Power Requirements
Power installation for the DSC Platform must be carried out in accordance with Article 250 of the National Electrical Code (NEC), and with any other national or local safety codes and practices that apply in your area. Cable size, type, color, and termination is provided in this guide only for guidance and may differ from codes in your location.
When the system is plugged in, high voltages are present on the midplane. Do not reach into the enclosure.
Always make sure that the system is properly grounded before applying power.
The intra-building port(s) of the PDU is suitable for connection to intra building or unexposed wiring or cabling only. These ports MUST NOT be metallically connected to interfaces that connect to the Online Service provider (OSP) or its wiring. These interfaces are designed for use as intra-building interfaces only (Type 2 or Type 4 ports as described in GR-1089-CORE, Issue 4) and require isolation from the exposed OSP cabling. The addition of Primary Protectors is not sufficient protection in order to connect these interfaces metallically to OSP wiring.
Do not use surge/transient suppressors without careful and expert power system analysis. Most surge/transient suppressors can cause system damage from transients if used in the typical manner.
The power supply automatically shuts down if a power surge is detected on the line. Recovery requires you to turn the DC Power source OFF and then ON (there is no Power Standby switch).
It is recommended that you pause at least thirty seconds between shutting down and powering up a shelf. This pause allows the capacitors in the sense feedback circuitry to fully discharge.
Failure to properly design a shelf’s power input subsystem could result in voltage transference, system damage, or safety issues.
The DSC Platformplatform is equipped with a DC-powered system consisting of two primary Power Modules (PMs) and one backup PM. This modular configuration ensures an N+1 redundant, load sharing, DC power supply.
The maximum power consumption for the DSC Platform platform is 2,200 W per shelf. Depending on your configuration, each shelf in a multi-shelf configuration consumes different levels of power, up to the maximum power capacity limit of 2,200 W.
The actual power consumption is determined by the individual shelf configuration.
The DSC Platform shelf’s Power Entry Module (PEM) is connected to the Power Distribution Unit (PDU). The PDU is then connected to the building DC power supply (see DSC 8000 Power Connection Diagram). As permanently connected equipment, a readily accessible disconnect device is recommended for the building wiring installation. The PDU provides over-current protective devices for each shelf. Connection of the PDU to building wiring is to be provided and appropriately rated for the installation in accordance with NEC or the applicable local jurisdiction to handle the current indicated in the input specification.
The DC power disconnect devices (fuses) for the DSC Platform are provided for the PDU. For more information about fuses, see PDU Fuses and Replacing TPA and GMT Fuses in the PDU.
It is recommended the DSC Platform is located in the same immediate area (such as, adjacent racks) as any other equipment that has a connection between the earthed conductor of the same DC supply circuit and the earthing conductor, and also the point of earthing of the DC system. The DC system must not be earthed elsewhere.
Connect the DSC Platform directly to the DC supply system earthing electrode conductor, or to a bonding jumper from an earthing terminal bar or bus to which the DC supply system earthing electrode is connected.
Locate the DC supply source within the same premises as the DSC Platform.
Do not switch or disconnect devices using the earthed circuit conductor between the DC source and the point of connection of the earthing electrode conductor.
When installing a non-detachable DC power supply cable in the field, this cable must:
- be UL Listed (example CCN is QPPL, Power Cable Assemblies)
- employ Listed closed loop wire connectors