In this section:
To reduce the possibility of electric shock from a telephone or Ethernet system, make all connections to the system ground and power source before making the connections described in this section. Disconnect telephone and Ethernet before disconnecting your enclosure from the power source.
Providing power to the DSC 8000 varies depending on the site and national and/or local safety codes and practices.
Power is routed from the building’s -48 VDC supply source to the PDU high power input terminals. This power is then distributed from the PDU high power outputs to the DSC 8000 shelves (see the following figure).
DSC 8000 Power Connection Diagram
Before you start any of the procedures in the section, make sure that the DSC 8000 is properly grounded (refer to Grounding the DSC 8000).
For more information about power management, refer to Power Management. For information about power requirements, see Verifying Power Requirements.
The DSC 8000 platform does not include a power ON/OFF switch.
The DSC 8000 must be connected to properly rated power sources. For permanently connected equipment, a readily accessible disconnect device should be incorporated in the building wiring installation. Circuit breakers should be rated to handle the current indicated in the input specifications listed on the product identification label on the rear of the DSC 8000 shelf.
It is recommended that you review and thoroughly understand the information contained in this section before installing any power connection.
Power installation for the DSC 8000 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 sizes, types, colors, and terminations provided in this guide are for guidance only and may differ from codes in your location.
The DSC 8000 uses high electrical energy levels. Ensure that the -48 V power source is turned off before connecting power cables.
Power Supplies must be replaced by qualified service personnel only.
Avoid Electric Overload. To avoid electric shock or fire hazard, connect your system to an input voltage source only as specified in the product user manual.
The DSC 8000 must be isolated from input power sources and locked out before servicing. Therefore, make sure that the -48 VDC power source that you are connecting the this system to is turned off and there is a tag or label over the power source switches or breakers (lock-out/tag-out) to indicate that the power source is turned off intentionally.
A licensed electrician must install, replace, or service power and ground connections to the DSC 8000. Actual connections depend on the site and national and/or local safety codes and practices. The following topics address these connections but provide example connections only.
The intra-building port(s) of the PDU is suitable for connection to intra building or unexposed wiring or cabling only. These 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.
Microprocessor heat sinks may become hot during normal operation. To avoid burns, do not allow anything to touch processor heat sinks.
To avoid electric shock or fire hazard, do not operate this DSC 8000 with any covers or panels removed from the chassis.
To avoid the risk of electric shock, do not operate the DSC 8000 in wet, damp, or condensing conditions.
To avoid injury, fire hazard, or explosion, do not operate the DSC 8000 in an explosive atmosphere.
If the DSC 8000 has multiple power sources, disconnect all external power connections before servicing.
You must connect the platform only to a DC-input power source that has an input supply voltage from -36 VDC to -60 VDC. If the supply voltage is not in this range, the DSC 8000 might not operate properly or might be damaged.
The DSC 8000 platform must be installed only 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.
The maximum power consumption for the DSC 8000 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.
Power is routed from the building’s -48 VDC supply source to the PDU high power input terminals. The power then is then distributed from the PDU high power outputs to the platform shelves.
Before performing any task in the following procedure, make sure that the -48 VDC power source that you are connecting the platform to is turned OFF and there is a tag or label over the power source switches or breakers (lock-out/tag-out) to indicate that the power source is turned OFF intentionally.
A licensed electrician must install, replace or service power and ground connections to the DSC 8000. Actual connections depend on the site and national and/or local safety codes and practices. The following topics address these connections but provide example connections only.
You must connect the platform only to a DC-input power source that has an input supply voltage from -43.5 V to -60 VDC. If the supply voltage is not in this range the DSC 8000 might not operate properly or might be damaged.
The DSC 8000 platform is only 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.
The following table describes the required Power Distribution Unit (PDU) power connection hardware.
PDU Power Connection Hardware Summary
The cables and hardware listed in this table are not supplied with the Ribbon DSC 8000
Item | Specifications |
---|---|
Power Cables | A minimum of 1 and up to four 4 AWG grounding cables (dependent on local requirements) with a 6.86 mm (1/4 in.) double ring lug connector such as the PANDUIT LCD4-14A-L or equivalent. The two supply cables are either red or black depending on individual site application requirements. The cables must be labeled -48V. If they are not, trace them back to their source to determine if they are correct. The two return cables are either red or black depending on individual site application requirements. The cables must be labeled as a battery return . If they are not, trace them back to their source to determine if they are correct. |
Start
If the power service panel cover is attached to the back of the PDU, use a Phillips head screwdriver to loosen the two retaining screws holding it in place.
Position the power service panel cover so the screw heads align with the wide part of the keyhole cutouts in the cover.
Remove the power service panel cover to reveal the PDU power terminals.
There are two sets of power inputs, A and B. Each power input block contains two inputs, labeled “Battery,” and two return terminals, labeled “Return.”
Power input block B, on the left, has its battery inputs on the left and its returns on the right, while power input block A on the right has its returns on the left and its battery inputs on the right.
Using an appropriate wire cutting tool, cut two 4 AWG cables no longer than 15.2 m (50 ft.) with red insulation for the PDU battery (-48VDC) power input blocks.
Using an appropriate wire cutting tool, cut two 4 AWG cables no longer than 15.2 m (50 ft.) with black insulation for the PDU return power input blocks.
Remove approximately 12.7 mm (0.5 in.) of the insulation on both ends of each cable.
An exposed wire lead from the DC input power source can conduct harmful levels of electricity. Make sure that no exposed portion of the DC input power source wire extends from the ring terminal.
Insert one end of a cable into a 6.86 mm (1/4 in.) double ring lug connector such as the Panduit LCDX4-14B-L, or equivalent, and using the appropriate crimping tool for this terminal, crimp the terminal onto the wire.
Repeat for each end of all four cables.
Remove the nuts and lock washers from the two return posts on the PDU power input block A.
Place a double-hole ring terminal attached to one of the black cables on the two return posts.
The closest metric equivalent for a 1/4 in. ring terminal is a ring terminal for an M6 stud. This ring terminal has a 6.86 mm hole.
Thread a lock washer and nut onto each return post. The nuts and lock washers on the posts are 7/16 in. Use the appropriate torque wrench to securely fasten these nuts and lock washers onto the posts using 5.0Nm (45 lbf-in) torque.
Feed the cable to the appropriate fuse panel or breaker switch from which the shelf DC power is supplied and attach to the return conductor according to the appropriate electrical code.
Remove the nuts and lock washers from the two posts on the PDU power input block A marked “Battery”.
Place a double-hole ring terminal attached to a red 4 AWG cable on the two battery posts.
Thread a lock washer and nut onto each battery post. The nuts and lock washers on the posts are 7/16 in. Use the appropriate torque wrench to securely fasten these nuts and lock washers onto the posts using 5.0Nm (45 lbf-in) torque.
Feed the cable to the appropriate fuse panel or breaker switch from which the shelf DC power is supplied and connect according to the appropriate electrical code.
Repeat steps 10-17 for the return and battery posts on the PDU power input block B.
Locate the power service panel cover and position it so the screw heads align with the wide part of the keyhole cutouts in the cover.
Push the screw heads through the wide part of the keyhole cutouts in the cover and reposition the cover so the screw heads align with the narrow part of the keyhole cutouts.
Using a Phillips head screwdriver, tighten the two retaining screws until they securely hold the power service panel cover in place.
Label all cables for future identification as required.
The maximum power consumption for the DSC 8000 platform is 2200W 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 2200W.
The actual power consumption depends on your DSC 8000 platform configuration.
Power is routed from the building’s -48 VDC facility supply to the PDU power input terminals. The power is then distributed from the PDU high power outputs to the shelves.
Before performing any task in the following procedure, make sure that the -48 VDC power source that you are connecting the shelves to is turned OFF. Ensure there is a tag or label over the power source switches or breakers (lock-out/tag-out) to indicate that the power source is turned OFF intentionally.
The following figure shows the DC Power Entry Module (PEM) grounding and power connections.
Redundant DC power feeds are kept isolated from one another. The feeds are not diode-OR’ed together. This is important for telecommunication facilities that provide redundant power plants because a diode failure may allow faults in one power plant to affect the other.
DSC 8000 Direct Current PEM Connections
The power feeds are connected inside the Power Entry Module (PEM). The power source should be sized and protected to supply the total power to the DSC 8000 chassis from one feed, even if both feeds are used.
The cables used to make these connections are installed on the Power Distibution Unit (PDU) prior to shipment.
Start
Remove the protective power input cover to expose the DC power input panel on the PEM. Grasp the cover with your thumb and index finger, then flex the cover to either side and lift the opposite side.
Starting at the Power Distribution Unit, connect the cable from the A Return on the PDU to the RTN A (Return) connection on the PEM (see Figure DSC 8000 Power Connection Diagram). The PDU and PEM cable connections are labeled as shown below.
Repeat steps 4 through 6 to connect the -48 DC power to the “B” Terminal and its Return.
There are four cables to be connected on each PEM (shelf).
When all cables have been connected to the PEM, snap the plastic power input panel cover in place.
When you have provided the appropriate power input and grounds to the DSC 8000 platform (refer to Grounding the DSC 8000 and Figure DSC 8000 Power Connection Diagram), the power modules in each shelf are automatically enabled.
The system is properly powered when the PM In Service LEDs display steady green. The PM LEDs show the power input status for each module. The LED of a redundant PM displays a steady amber (see the following figure).
Power Module (PM) LEDs
If the PM LEDs display red, do the following:
A system card or PM that does not power-on may have become unseated in its slot during shipping. Remove and re-insert the card to properly mate the connectors. If the card still does not power-on, remove and re-insert the card again to ensure proper connector mating. Contact Customer Support if the card still does not power-on after multiple attempts to reseat the card.
Start
If the PM does not power on, the module may have become unseated its slot during shipping. Remove and re-insert the PM to properly mate the connectors.
Start