Cisco CRS Carrier Routing System 8-Slot Line Card Chassis System Description
Power System
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Table of Contents

Cisco CRS 8-Slot Chassis Power Systems

Power Systems Overview

Power Component Information Common to Two Types of Power System

Basic Chassis Power Details

Power System—Fixed Configuration

Power System—Modular Configuration

Precautions and Recommendations

Grounding Guidelines

DC Power Systems

AC Power Systems

CRS 8-Slot Chassis Fixed Configuration Power System

Overview—Fixed Power Configuration

Fixed Configuration Power Architecture

Fixed Configuration Chassis Power Zones

Fixed Configuration DC Power

Fixed Configuration DC Power Distribution Unit

Fixed Configuration DC Power Entry Module

Fixed Configuration DC PEM Indicators

Fixed Configuration AC Power

Fixed Configuration AC Delta Power

Fixed Configuration AC Wye Power

Fixed Configuration AC Rectifier

Fixed Configuration AC Rectifier Status Indicators

CRS 8-Slot Chassis Modular Configuration Power System

Overview—Modular Power Configuration

M odular Configuration Power Architecture

M odular Configuration DC Power

Modular Configuration DC Power Shel f

M odular Configuration DC Power Module

Modular Configuration AC Power

Modular Configuration AC Power Shelf

M odular Configuration AC Power Module

Cisco CRS 3-Phase AC Power Distribution Unit

Cisco CRS 8-Slot Chassis Power Systems

This chapter describes the power systems of the Cisco CRS 8-Slot Line Card Chassis. It contains the following topics:

Basic Chassis Power Details

Power System—Fixed Configuration

Power System—Modular Configuration

Precautions and Recommendations

Grounding Guidelines

DC Power Systems

AC Power Systems

Overview—Fixed Power Configuration

Fixed Configuration Power Architecture

Fixed Configuration Chassis Power Zones

Fixed Configuration DC Power

Fixed Configuration AC Power

Overview—Modular Power Configuration

Modular Configuration Power Architecture

Modular Configuration DC Power

Modular Configuration AC Power


Note Specifications for power components are provided in Appendix A, “Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Specifications.”


Power Systems Overview

There are two options for power systems:

  • Fixed configuration power system—consists of two power distribution units (PDUs) and either DC power entry modules (PEMs) or AC rectifiers. The AC version requires 3-phase AC-Delta or AC-Wye input power to the PDU. The PDU distributes facility power to the AC rectifier or DC PEM, which in turn provides processed power to the chassis. The fixed configuration power system includes SNMP MIBS and XML support.

Note In a fixed configuration AC or DC power system, PDU refers to the power component that connects to the AC rectifier or DC PEM.


  • Modular configuration power system—consists of two power shelves and either AC or DC power modules (PMs). However, unlike the fixed configuration power system, the AC version of the modular configuration power system requires single-phase AC input power to power the shelves. If you have 3-phase AC-Delta or AC-Wye at your equipment, a Cisco CRS PDU will be required to convert 3-phase AC input power to single-phase AC input power for the power shelf. At the shelf level, the power system provides 2N redundancy; the PMs themselves provide load-share redundancy. The modular configuration power system also includes SNMP MIBs and XML support.

Note In a modular configuration AC power system, PDU refers to the Cisco CRS PDU that converts 3-phase AC-Wye or AC-Delta input power to single-phase AC input power for the modular configuration AC power shelf. For further information, refer to Cisco CRS 3-Phase AC Power Distribution Unit Installation Guide.


Power components are not interchangeable between the fixed and modular configuration power system.

Power Component Information Common to Two Types of Power System

This section contains information shared by the fixed configuration power components and the modular configuration power components in the following topics:

Basic Chassis Power Details

The Cisco CRS 8-slot line card chassis can be configured with either a DC-input power system or an AC-input power system. The chassis power system provides the necessary power for chassis components. Input power availability is site dependent and may be DC, AC Delta, or AC Wye.

A fixed configuration AC PDU connects to an AC rectifier, while a fixed configuration DC PDU connects to a DC PEM. A modular configuration AC power shelf houses up to 3 AC PMs, while a modular configuration DC power shelf houses up to 4 DC PMs. It is required that you use only one type of power shelf in a chassis at a time.


Note In a modular configuration power system, both AC and DC power supplies are referred to as power modules (PMs).



Note This unit might have more than one power module connection. All connections must be removed to de-energize the unit. Statement 1028


Power System—Fixed Configuration

Three types of PDUs exist for fixed configuration power system:

• AC Wye PDU

• AC Delta PDU

• DC PDU

The AC PDU connects to the AC rectifier, while the DC PDU connects to the DC PEM. Although there are differences among the different PDU types (AC Wye, AC Delta, and DC), they are installed in the same manner.

Fixed configuration power system consists of two power distribution units (PDUs) and either DC power entry modules (PEMs) or AC rectifiers. The AC version requires 3-phase AC-Delta or AC-Wye input power to the PDU. The PDU distributes facility power to the AC rectifier or DC PEM, which in turn provides processed power to the chassis. The fixed configuration power system includes SNMP MIBS and XML support.


Note In a fixed configuration AC or DC power system, PDU refers to the power component that connects to the AC rectifier or DC PEM.


For detailed information about AC and DC PDUs, see the Cisco CRS 3-Phase AC Power Distribution Unit Installation Guide .

Power System—Modular Configuration

Modular configuration power system consists of two power shelves and either AC or DC power modules (PMs). However, unlike the fixed configuration power system, the AC version of the modular configuration power system requires single-phase AC input power to power the shelves. If you have 3-phase AC-Delta or AC-Wye at your equipment, a Cisco CRS PDU will be required to convert 3-phase AC input power to single-phase AC input power for the power shelf. At the shelf level, the power system provides 2N redundancy; the PMs themselves provide load-share redundancy.


Note In a modular configuration AC power system, PDU refers to the Cisco CRS PDU that converts 3-phase AC-Wye or AC-Delta input power to single-phase AC input power for the modular configuration AC power shelf. For further information, refer to Cisco CRS 3-Phase AC Power Distribution Unit Installation Guide.



Caution Use only one type of modular configuration power shelf—AC or DC—and its mating AC or DC PMs in a chassis at one time.

Precautions and Recommendations

Follow these precautions and recommendations when planning power connections to the router:

  • For the fixed configuration power system, although PDUs may be installed or removed without powering down the system, for safety purposes we recommend that you power down the system before you install or remove a PDU.
  • For the modular configuration power system, although power shelves may be installed or removed without powering down the system, for safety purposes we recommend that you power down the system before you install or remove a power shelf.

Grounding Guidelines

The router chassis has safety earth ground connections in conjunction with the power cabling to the fixed configuration PDUs. Modular configuration supports chassis grounding only. The chassis allows you to connect the central office ground system or interior equipment ground system to the bonding and grounding receptacles on the router chassis, when either a fixed or modular configuration power system is installed.

Each side of the chassis has one pair of threaded ground studs located on the inside of the chassis and two sets of grounding receptacles located on the outside of the chassis. These ground points are also called the network equipment building system (NEBS) bonding and grounding points.


Note These bonding and grounding receptacles satisfy the Telcordia NEBS requirements for bonding and grounding connections.


Figure 2-1 shows six chassis grounding points that are provided at the rear (MSC) side of the chassis.

Figure 2-1 NEBS Bonding and Grounding Points (Rear of Chassis) - Fixed Configuration AC Power Shown

 

 

1

NEBS bonding and grounding points (inside chassis)

2

NEBS bonding and grounding points (outside chassis)


Caution Do not remove the chassis ground wire unless the chassis is being replaced.

See Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Installation Guide for additional grounding and bonding details and installation instructions.

DC Power Systems

Each DC powered chassis contains two fixed configuration PDUs or two modular configuration power shelves for 2N redundancy.

  • In the fixed configuration power system, each PDU accepts one DC PEM for 2N redundancy. The PDUs and PEMs are field replaceable. The PDUs contain the input power connectors.
  • In the modular configuration power system, each power shelf accepts up to four PMs. The power shelves and PMs are field replaceable. The power shelves contain the input power connectors. For details, see CRS 8-Slot Chassis Modular Configuration Power System.

Note Depending on the hardware deployed at your site, your system may not consume the maximum power supplied by the power system.


AC Power Systems

Each AC powered chassis contains two AC power shelves for 2N redundancy. The shelves contain the input power connectors.

• In the fixed configuration power system, each PDU accepts one AC power rectifier. The PDUs and AC power rectifiers are field replaceable.


Note Depending on the hardware deployed at your site, your system may not consume the maximum power supplied by the power system.


CRS 8-Slot Chassis Fixed Configuration Power System

This section describes the fixed configuration power system and contains the following topics:

Overview—Fixed Power Configuration

This section describes the Cisco CRS 8-slot fixed power configuration system.


Caution Use only one type of fixed configuration PDU—AC Wye, AC Delta, or DC—and its mating AC rectifier or DC PEM in a chassis at one time.

The Cisco CRS 8-slot line card chassis DC power system provides 7,500 watts to power the chassis. Each DC PDU is connected to three pairs of DC power feeds and powers a single DC PEM. Input DC power enters the PDU and is passed to the PEM, which provides power to the components in the chassis.

  • Each DC PEM has its own circuit breaker.
  • The fixed configuration power system distributes power in power zones.
  • The DC PDUs and DC PEMs are field replaceable.

Fixed Configuration Power Architecture

Cisco CRS 8-Slot chassis AC and DC fixed configuration power systems use A and B power supplies to provide reliable power to all chassis components. In the fixed configuration power system, each PDU accepts one DC PEM for 2N redundancy. The PDUs and PEMs are field replaceable. The PDUs contain the input power connectors.

The Cisco CRS 8-Slot Line Card Chassis requires 8.0 kW of DC input power and 8.75 kW of AC input power from the building supply.

AC or DC input power enters the chassis through the A and B power supplies and is distributed to the A or B power bus. Both buses distribute power through the midplane to the MSC, PLIM, switch fabric, and RP card slots. See Figure 2-4 for the 8-slot chassis power routing distribution for a fixed DC configuration and Figure 2-7 for the power routing distribution for a fixed AC configuration.

  • The A power module supplies –54.5 VDC to the A bus.
  • The B power module supplies –54.5 VDC to the B bus.

Because chassis components are powered by both A and B power inputs, the line card chassis can continue to operate normally if:

  • One AC rectifier or DC PEM fails.
  • One input power (A or B) fails.
  • One bus fails.
  • One PDU fails.

It takes two failures for the system to be degraded. In addition, the failures must occur in both the A and B sides of the power architecture and affect the same power zone for the degradation to occur.

Individual chassis components have power-related devices (OR-ing diodes, inrush control circuits, and EMI filters) that are part of the chassis power architecture. These power-related devices form part of the dual power source (A and B bus) architecture, and enable online insertion and removal (OIR) of the components, also called hot swapping .

Fixed Configuration Chassis Power Zones

The AC or DC power system distributes power in the chassis through three power zones, which provide power redundancy and reliability. Each power zone receives power from both power supplies, which ensures that each zone can operate in case of one power module failure.

Figure 2-2 shows the three power zones in the Cisco CRS 8-Slot Line Card Chassis. The table below the figure identifies the power redundancy connection for the fan trays.

Figure 2-2 Cisco CRS 8-Slot Line Card Chassis Power Zones

 

 

Power Supply
Fan 0
Fan 1

Power Supply A (PS A)

Power for Zone 1

Power for Zone 3

Power Supply B (PS B)

Power for Zone 3

Power for Zone 1

The zones shown in Figure 2-2 are further explained in Table 2-1 and Table 2-2 .

T

Table 2-1 Power Zone Assignment

Zone Number
Front (PLIM)
Rear (Line Card)

Zone 1

Slot 0, 1, 2

Slot 0, 1, 2

Zone 2

Slot 3, 4, / RP0, 1

Slot 3, 4 / FC 0, 1, 2, 3

Zone 3

Slot 5, 6, 7

Slot 5, 6, 7

 

Table 2-2 Power Connection to Power Zones and Fan

Power A
Power B

Pin 24

Pin 22

Pin 2

Pin 24

Pin 22

Pin 2

Zone 1

Zone 2

Zone 3

Zone 1

Zone 2

Zone 3

Fan 0 (Zone 1)

Fan 1 (Zone 3)

Fan 0 (Zone 3)

Fan 1 (Zone 1)

Each fan tray—the upper fan tray (Fan 0) or the lower fan tray (Fan 1)—is powered by both PS A and PS B to have power redundancy for the fan tray. In addition, both fan trays receive power from both Power Zones 1 and 3 for redundancy. Both fan trays are monitored by RP0 and RP1 shelf controllers.

Any types of cards can be installed in a power zone.

Fixed Configuration DC Power

The Cisco CRS 8-slot line card chassis DC power system provides 7,500 watts to power the chassis. Each DC PDU is connected to three pairs of DC power feeds and powers a single DC PEM. Input DC power enters the PDU and is passed to the PEM, which provides power to the components in the chassis.

  • Each DC PEM has its own circuit breaker.
  • The fixed configuration power system distributes power in power zones.
  • The DC PDUs and DC PEMs are field replaceable.

Unlike the Cisco CRS 16-slot line card chassis, the Cisco CRS 8-slot line card chassis does not contain an alarm module. A microprocessor in the DC PEM monitors the status of each DC PEM. The microprocessor communicates with the system controller on the route processor (RP) card. LEDs on the front panel of the RP card indicate active alarm conditions.

The DC PDU is shipped with a plastic safety cover over the input terminal block, as shown in Figure 2-3. This safety cover has two parts, each part held on to the PDU with a Phillips screw. We recommend removing the safety cover only when wiring and unwiring the chassis. The safety cover is slotted in such a way that the wires can only come out on the bottom portion of the cover.

Figure 2-3 Fixed Configuration DC PDU With Plastic Safety Cover

 

 

1

Each set of cables (RTN and –48/–60 VDC) is a single VDC input.

Each PDU requires three DC inputs of –48/–60 VDC (nominal), 60 A service. The PDU accepts input DC power in the range –40.5 to –75 VDC, and has three sets of double-stud terminals (-48/-60 VDC Lines and -48/-60 VDC Returns) for connecting to the VDC inputs.

Each DC PDU should be connected to a different central office DC power source:

  • One PDU should be connected to three –48/–60 VDC “A” buses.
  • Other PDU should be connected to three –48/–60 VDC “B” buses.

If DC power to a PDU fails, the other PDU provides enough power for the chassis. This 2N power redundancy enables the routing system to operate in spite of single power failure.

For DC power cables, we recommend that you use commensurately rated, high-strand-count copper wire cable, based on local electrical codes. These wires are not available from Cisco Systems; they are available from any commercial vendor. DC power cables must be terminated by cable lugs at the power shelf end.

Table 2-3 lists the fixed configuration DC power components and PIDs for the Cisco CRS 8-Slot Line Card Chassis.

 

Table 2-3 Fixed Configuration DC Power Components

Power Component

DC PDU

CRS-8-LCC-PDU-DC(=)

Cisco CRS DC power distribution unit
(two required for each chassis)

DC PEM

CRS-8-DC-PEM(=)

Cisco CRS DC PEM1
(two required for each chassis, one for each PDU)

Power module filter

CRS-8-PWR-FILTER(=)

Filters (five per pack) for AC rectifier and DC PEM

1.PEM = Power Entry Module

Fixed Configuration DC Power Distribution Unit

A DC power distribution unit (PDU) contains one DC input terminal block with 6 poles of two row M6 studs mating with industry standard two-hole compression lugs on 5/8-inch centers, one ground blade connector and one output connector mating with the DC PEM. One DC PDU requires three independent nominal -48/-60 VDC, 60 A input services.

One DC PDU requires six 45° angle, industry standard, 2-hole compression lugs with holes on 5/8- inch centers for three pairs (three -48/-60 VDC inputs and three returns) of DC input connections.

Figure 2-4 illustrates the 8-slot chassis power routing distribution for a fixed DC configuration.

Figure 2-4 CRS 8-Slot Line Card Chassis Power Distribution - Fixed DC Configuration

 

Fixed Configuration DC Power Entry Module

The DC power entry module, shown in Figure 2-5, processes input power from the DC PDU and passes the power to the system chassis. DC PEMs are field-replaceable.

Three -48/-60 VDC inputs enter the DC PEM at the rear of the PEM through a connector on the DC PDU. The PEM performs inrush current limiting, EMI filtering, surge protection, and over voltage protection to process the power before it exits the PEM and is distributed to the chassis midplane.

Each DC PEM has self-contained cooling fans that draw air through the module.

Figure 2-5 shows the front of the DC PEM. The yellow power switch on the front top left corner can be pushed or pulled to turn the power on or off, respectively.

Figure 2-5 DC PEM—Front View

 

 

1

Power switch

3

Handle

2

Module air filter

4

Captive screws

A microprocessor in the DC PEM monitors the status of each DC PEM. The microprocessor communicates with the system controller on the route processor (RP) card. The microprocessor circuitry monitors the following DC PEM fault and alarm conditions:

  • Fault : Indicates a failure in an DC PEM, such as failed bias supply, or over temperature. It includes a warning that the DC output voltage is outside the allowable output range.
  • DC Input Fail : Indicates that the DC input voltage is out of range.
  • Circuit Breaker Trip : Indicates that the DC PEM circuit breaker has tripped.
  • Over Temperature : Indicates that the DC PEM has exceeded the maximum allowable operating temperature.
  • DC PEM Present : Indicates that the DC PEM is present and seated properly in the system chassis.
  • Voltage and Current Monitor signals (Vmon, Imon) : Indicates how much output voltage and current are provided by the DC PEM.

Each DC PEM contains an ID EEPROM that stores information used by the control software (for example, part number, serial number, assembly deviation, special configurations, test history, and field traceability data).

Fixed Configuration DC PEM Indicators

Each DC PEM has power and status indicators (see Figure 2-5, near the handle). The DC PEM indicators receive power from both DC PEMs; therefore, the indicators are operational even when the DC PEM is not powered from its input voltage.

Table 2-4 lists DC PEM status indicators and their functions.

 

Table 2-4 DC PEM Status Indicators

Name
Color
Function

PWR OK

Green

The DC PEM is operating normally with power.

FAULT

Yellow

A fault has been detected in the DC PEM.

DC INPUT FAIL

Yellow

DC input is out of range or is not being provided to the DC PEM.

OT

Yellow

The DC PEM is overheated and it has been shut down.

BREAKER TRIP

Yellow

The input circuit breaker is off (in the off position).

Table 2-5 lists DC PEM LED readings during failure conditions.

 

Table 2-5 DC PEM LED Conditions

Condition
PWR OK LED
Fault LED
DC Input Fail LED
OT LED
Breaker Trip LED

No fault
(power is on)

On

Off

Off

Off

Off

Failed DC input power

Off

Off

On

Off

Off

Overheated temperature

Off

On

Off

On

Off

Tripped breaker

Off

Off

Off

Off

On

Fixed Configuration AC Power

An AC-powered Cisco CRS 8-slot line card chassis contains two AC power distribution units (PDUs) and two AC rectifier modules. Each AC PDU is connected to a 3-phase (200 to 240) input VAC power source and connects to a single 7500-watt AC rectifier module that is field replaceable. Each AC rectifier module converts input AC power to the 54.5 VDC used by the Cisco CRS 8-slot line card chassis. Each rectifier has its own circuit breaker.

To provide 2N power redundancy for the Cisco CRS 8-slot line card chassis, each PDU and AC rectifier pair is connected to a different AC power source. During normal operation when both power sources are operational, both PDUs and rectifiers function together to power the chassis. However, if a power source fails, the other power source provides the other PDU and rectifier pair with enough input power to power the chassis. This 2N power redundancy enables the routing system to operate despite the power failure.

Two versions of the AC PDU are available to accommodate AC input power in either the Delta or Wye (see Figure 2-6 for fixed AC Wye PDU) configuration. Each PDU has a different Cisco part number. The PDUs are shipped with AC power cords that are 14 feet (4.3 m) long.

Unlike the Cisco CRS 16-slot line card chassis, the Cisco CRS 8-slot line card chassis does not contain an alarm module. A microprocessor in the AC rectifier monitors the status of each AC rectifier. The microprocessor communicates with the system controller on the RP card. LEDs on the front panel of the RP card indicate active alarm conditions.

The AC PDUs have the following input VAC power requirements:

  • AC Wye input: 3-phase, 200 to 240 VAC nominal (phase-to-neutral), 50 to 60 Hz, 16 A (International) or 20 A (North America). The PDU is rated for 14-amp service, and accepts AC input of 16 or 20 A.

The Wye power cord has a 5-pin IEC 60309 plug that is rated for 400 VAC, 16 or 20 A, (3W + N + PE). The power cord plugs into a similarly rated IEC 60309 receptacle.

  • AC Delta input: 3-phase, 200 to 240 VAC nominal (phase-to-phase), 50 to 60 Hz, 30 A. The PDU is rated for 24-amp service, and accepts AC input of 30 A.

The Delta power cord has a 4-pin NEMA L15-30P plug that is rated for 250 VAC, 30 A (3W + PE). The power cord plugs into a similarly rated NEMA L15-30R locking-type receptacle.

For additional power details, see Appendix A, “Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Specifications.”

Figure 2-6 Fixed Configuration AC Wye PDU

 

Table 2-6 lists the AC power components and PIDs for the Cisco CRS 8-Slot Line Card Chassis.

 

Table 2-6 Fixed Configuration AC Power Components

AC Delta Power Component

AC Delta PDU

CRS-8-LCC-PDU-ACD(=)

Cisco CRS AC Delta power distribution unit
(two required for each chassis)

AC rectifier module

CRS-8-AC-RECT(=)

Cisco CRS AC rectifier module
(two required for each chassis, one for each PDU)

AC WYE Power Component

AC Wye PDU

CRS-8-LCC-PDU-ACW(=)

Cisco CRS AC Wye power distribution unit
(two required for each chassis)

AC rectifier module

CRS-8-AC-RECT(=)

Cisco CRS AC rectifier module
(two required for each chassis, one for each PDU)

Power module filter

CRS-8-PWR-FILTER(=)

Filters (five per pack) for AC rectifier and DC PEM


Note For a complete list of CRS 8-slot chassis power specifications, see Appendix A, “Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Specifications.”


Fixed Configuration AC Delta Power

The AC Delta PDU contains the AC cable assembly with AC plug, EMI filter, and power distribution connections and wiring.

Figure 2-7 shows the 8-slot chassis power routing distribution for a fixed AC configuration.

Figure 2-7 CRS 8-Slot Chassis AC Delta Power Distribution - Fixed Configuration-

 

Figure 2-8 shows wiring for the AC Delta PDU.

Figure 2-8 AC Delta Power Wiring

 

Fixed Configuration AC Wye Power

Figure 2-9 shows wiring for the AC Wye PDU.

Figure 2-9 AC Wye Power Wiring

 

Fixed Configuration AC Rectifier

The AC rectifier is an AC power module that converts input AC power into the DC power necessary to power chassis components.


Note The same AC rectifier is used with the AC Delta and AC Wye PDUs.


The rectifier takes AC input power from the PDU, rectifies the AC into DC, provides filtering and control circuitry, provides status signaling, and passes the regulated and isolated DC power to the chassis midplane. Each AC rectifier has self-contained cooling fans that draw air through the module.

Figure 2-10 shows the front of the AC power rectifier. The yellow power switch is on the front top left corner of the rectifier. The switch can be pushed or pulled to turn the power on or off, respectively.

Figure 2-10 AC Power Rectifier—Front View

 

 

1

Power switch

3

Handle

2

Module air filter

4

Captive screws

After the power enters the AC rectifier, internal circuits rectify the AC into DC, filter and regulate it. The conversion from AC to DC is done in two stages:

  • The first stage is for power factor correction (PFC). The PFC process converts the AC to regulated primary DC. The PFC maintains the AC input current to be sinusoidal and in-phase with the AC input. The result is near unity power factor.
  • The second stage is DC-to-DC conversion. The DC-to-DC process converts regulated primary side DC power to isolated –54.5 VDC secondary power.

A microprocessor in the AC rectifier monitors the status of each AC rectifier. The microprocessor communicates with the system controller on the route processor (RP) card. The microprocessor circuitry monitors the following AC rectifier fault and alarm conditions:

  • Fault : Indicates a failure in an AC rectifier, such as failed bias supply, over temperature or current limit. It includes a warning that the DC output is out of the allowable output range.
  • AC Input Fail : Indicates that the AC input voltage is out of range.
  • Circuit Breaker Trip : Indicates that the AC rectifier circuit breaker has tripped.
  • Over Temperature : Indicates that the AC rectifier has exceeded the maximum allowable operating temperature.
  • AC Rectifier Present : Indicates that the rectifier is present and seated properly in the power shelf.
  • Voltage and Current Monitor signals (Vmon, Imon) : Indicate how much output voltages and currents are provided by the AC rectifier.

Each AC rectifier contains an ID EEPROM that stores information used by control software (for example, part number, serial number, assembly deviation, special configurations, test history, and field traceability data).

Fixed Configuration AC Rectifier Status Indicators

Each AC rectifier has power and status indicators. The AC rectifier status indicators receive power from both AC power rectifiers; therefore, the status indicators are operational even when the AC rectifier is not powered from its input voltage.

Table 2-7 lists the AC rectifier status indicators and their functions.

 

Table 2-7 AC Rectifier Status Indicators

Name
Color
Function

PWR OK

Green

The AC rectifier is operating normally with power.

FAULT

Yellow

A fault has been detected in the AC rectifier.

AC INPUT FAIL

Yellow

AC input is out of range or is not being provided to the AC rectifier.

OT

Yellow

The AC rectifier is overheated and it has been shut down.

BREAKER TRIP

Yellow

The input circuit breaker is off (in the off position).

ILIM

Yellow

The AC rectifier is operating in a current limiting condition.

Table 2-8 lists the LED readings during failure conditions

.

Table 2-8 AC Rectifier LED Conditions

Condition
PWR OK LED
Fault LED
AC Input Fail LED
OT LED
Breaker Trip LED
ILIM LED

No fault
(power is on)

On

Off

Off

Off

Off

Off

Failed AC input power

Off

Off

On

Off

Off

Off

Overheated temperature

Off

On

Off

On

Off

Off

Tripped breaker

Off

Off

Off

Off

On

Off

Current limit

Off

On

Off

Off

Off

On

CRS 8-Slot Chassis Modular Configuration Power System

This section describes the modular configuration power system and contains the following topics:

Overview—Modular Power Configuration

This section describes the CRS 8-slot chassis modular configuration power system. The modular configuration power solution is configurable. It includes the following components:

  • Two (redundant) AC or DC power shelves
  • Up to three AC power modules or four DC power modules per power shelf
  • Each DC power module provides 2100 Watts, with potential growth up to 8.4KW DC power per power shelf
  • Each AC power module provides 3000 Watts, with potential growth up to 9KW DC power per power shelf

Note The default modular configuration power system may not ship with the maximum number of power modules configured. Additional power modules can be added at any time, depending on the system’s power requirements.


Figure 2-11 and Figure 2-12 show an AC modular power module for the Cisco CRS 8-slot chassis.

Figure 2-11 Modular Configuration AC Power Shelf —Front View

 

Figure 2-12 Modular Configuration AC Power Shelf—Rear View

 

Figure 2-13 and Figure 2-14 show a front and rear view of a DC modular power shelf for the Cisco CRS 8-slot chassis.

Figure 2-13 Modular Configuration DC Power Shelf —Front View

 

Figure 2-14 Modular Configuration DC Power Shelf —Rear View

 

Modular Configuration Power Architecture

In the modular configuration power system, each power shelf accepts up to four PMs. The power shelves and PMs are field replaceable. The power shelves contain the input power connectors.


Note Depending on the hardware deployed at your site, your system may not consume the maximum power supplied by the power system.


The modular configuration power module provides the following features:

  • AC or DC power shelf redundancy
  • PM load-share redundancy
  • Elimination of power zone restriction, while maintaining zone protection
  • Capacity for future growth

The modular AC and DC power systems use A and B power shelves to provide reliable, 2N redundant power to all chassis components. See Figure 2-15 for the 8-slot chassis power routing distribution with a modular DC configuration and Figure 2-17 for the power routing distribution with a modular AC configuration.

All power modules in the modular power shelf power all zones. In addition, the modular power supplies work in parallel with each other, and they can monitor power consumption, performance, analysis, and power management concurrently.

Unlike the Cisco CRS 16-slot line card chassis, the power shelf on the Cisco CRS 8-slot line card chassis does not contain an alarm module. Instead, alarm functionality is integrated into the Route Processor (RP). The DC power module monitors power module status and processes alarm functions. The AC or DC power module distributes power and passes power module status signals to the system. Each power module has its own integrated fuse to protect the system, and each power module is plugged into its own power outlet.

The Cisco CRS 8-Slot Line Card Chassis requires 8.0 kW of DC input power and 8.75 kW of AC input power from the building supply.

Modular Configuration DC Power

The Cisco CRS 8-slot line card chassis modular configuration DC power system can provide up to 8,400 W to power the line card chassis. The modular configuration DC power system uses A and B power shelves to provide reliable, 2N redundant power to all chassis components.


Note Depending on the hardware deployed at your site, your system may not consume the maximum power supplied by the power system.


If DC power to one modular configuration power shelf fails, the other power shelf provides enough power for the chassis. This 2N power redundancy enables the routing system to operate in spite of single power failure.

Table 2-9 summarizes the DC power system specifications for the Cisco CRS 8-Slot Line Card Chassis.

 

Table 2-9 DC Power System Specifications

DC Power Component
Specifications

Power Shelf

Two DC power shelves

DC Power Shelf: Supports up to four DC power modules

Power Redundancy

Two DC Power Shelves each containing up to four DC power modules—2N redundancy

DC Input

Required input current is as follows:

  • 50 amps at –48 VDC nominal input voltage.
  • 40 amps at –60 VDC nominal input voltage
  • 60 amps at low input voltage (–40 VDC)

Required lugs: 45° angled industry standard 2-hole compression lugs with holes on 5/8- inch centers (for example, for AWG no. 2 wire: Panduit part number LCC2-14AH-Q or equivalent).

Ground Lug

Industry standard 2-hole compression lug with holes on 5/8- inch centers (Panduit part number LCD6-14A-L, or equivalent)

Figure 2-15 shows the 8-slot chassis power routing distribution for a modular DC configuration.

Figure 2-15 CRS 8-Slot Chassis Power Distribution- Modular DC Configuration

 

Modular Configuration DC Power Shelf

The DC modular configuration power shelf is the enclosure that houses the DC power modules and power distribution connections and wiring. The power shelf (see Figure 2-13 for front view and Figure 2-14 for rear view) installs in the Cisco CRS 8-slot line card chassis from the front and plugs into the chassis power interface connector panel.

Each modular configuration DC power shelf requires up to four DC input feeds of either –48 VDC (nominal), 50 A or –60 VDC (nominal), 40 A. The power shelf accepts input DC power in the range –40 to –72 VDC. Each terminal consists of two M6 threaded studs, 0.6 inches long, and centered 0.625 inches apart. The terminals have a safety cover.

Each DC power shelf supports up to four power modules, and accepts one 60 A battery feed per power module. Input DC power enters the power shelf and is processed by the power modules before being distributed to the chassis midplane. The power modules perform inrush current limiting, EMI filtering, surge protection, and circuit isolation on the input DC power, and then distribute the power via the internal bus bar in the chassis midplane.

Modular Configuration DC Power Module

Each DC power module provides 2100 Watts. The DC power module, shown in Figure 2-16 passes the power via the internal bus bar to the system and is similar to the AC power module. Power modules are field-replaceable.

Figure 2-16 Modular Configuration DC Power Module .

 

Two –48/–60 VDC inputs enter the power module at the rear of the power shelf, and exits the power module and is distributed to the chassis midplane.

Unlike the Cisco CRS 16-slot line card chassis, the power shelf on the Cisco CRS 8-slot line card chassis does not contain an alarm module. The DC power module monitors power module status and processes alarm functions. A microprocessor in the DC power module monitors the status of each DC power module. The microprocessor communicates with the system controller on the route processor (RP) card. The microprocessor circuitry monitors the following DC power module fault and alarm conditions:

  • Fault : Indicates a failure in an DC power module, such as failed bias supply, or over temperature. It includes a warning that the DC output voltage is outside the allowable output range.
  • DC Input Fail : Indicates that the DC input voltage is out of range.
  • Over Temperature : Indicates that the DC power module has exceeded the maximum allowable operating temperature.
  • DC Power Module Present : Indicates that the power module is present and seated properly in the system chassis.
  • Voltage and Current Monitor signals (Vmon, Imon) : Indicates how much output voltage and current are provided by the DC power module.

Each DC power module contains an ID EEPROM that stores information used by the control software (for example, part number, serial number, assembly deviation, special configurations, test history, and field traceability data).

Modular Configuration DC Power Module Indicators

Each DC power module has power and status indicators. The DC power module indicators receive power from both DC power modules; therefore, the indicators are operational even when the DC power module is not powered from its input voltage. The following three LED status indicators are located on the front of each DC power module:

  • Input OK - Green
  • Output OK - Green
  • Internal Fault - Red

The power module LED status indicators are not visible when the front grille is installed.

Table 2-10 lists the power module status indicators and their functions.

 

Table 2-10 Power Module Status Indicators

Name
Color
Function

Input OK

Green

Input OK LED turns on continuously when input voltage is present and within the regulation range.

Input OK LED flashes when input voltage is present but not within the regulation range.

Input OK LED is off when input voltage is not present.

Input OK LED flashes when hot-unplugging the power module from the power shelf to indicate that there is energy in the power module until the input bulk capacitor is completely discharged or the housekeeping circuit is shut down.

Output OK

Green

Output OK LED turns on continuously when power module output voltage is on.

Output OK LED flashes when power module output voltage is in a power limit or an overcurrent situation.

Internal Fault

Red

Internal Fault LED turns on continuously when there is an internal fault in the power module.

The Internal Fault LED on the DC power module is turned on continuously to indicate that one or more of the following internal faults is detected inside the power module:

  • 5V out of range
  • Output Stage OT
  • Fan Fault
  • OR-ing fault (Output voltage less than bus voltage)
  • OC shutdown
  • OT shutdown
  • OV shutdown
  • Input stage OT
  • Fault induced shutdown occurred
  • Thermal sensor fault
  • Vout out of range
  • Boost Vbulk fault

Once all of the faults have been removed and the power module is operating normally, the Internal Fault LED is turned off.

Modular Configuration AC Power

The Cisco CRS 8-slot line card chassis modular configuration AC power system can provide up to 9,000 W to power the line card chassis.


Note Depending on the hardware deployed at your site, your system may not consume the maximum power supplied by the power system.


The modular configuration power system provides the following features:

  • AC power shelf redundancy
  • PM load-share redundancy
  • Elimination of power zone distribution, while maintaining zone protection
  • Capacity for future growth

The modular configuration AC power systems use A and B power shelves to provide reliable, 2N redundant power to all chassis components.

The Cisco CRS 8-slot line card chassis does not contain an alarm module. The AC PM monitors PM status and processes alarm functions. The AC PM distributes power and passes PM status signals to the system. Each PM has its own integrated fuse to protect the system, and each PM is plugged into its own power outlet. Alarms are processed through the RP. LEDs on the front panel of the RP indicate active alarm conditions.

Unlike the fixed configuration AC power system, which requires 3-phase AC Delta or AC Wye input power, the modular configuration AC power system requires single-phase AC input power. If you have 3-phase AC Delta or AC Wye at your equipment, a Cisco CRS PDU will be required to convert 3-phase AC input power to single-phase AC input power for the power shelf. For further information, refer to Cisco CRS 3-Phase AC Power Distribution Unit Installation Guide .

Figure 2-17 shows the power routing distribution of the 8-slot chassis with a modular AC configuration power system.

Figure 2-17 CRS 8-Slot Chassis Power Module - Modular AC Configuration

 

As shown in Figure 2-17, AC input power enters the chassis through the A and B power supplies and is distributed to the A or B power bus. Both buses distribute power through the midplane to the MSC, PLIM, switch fabric, and RP card slots.

Each DC power module provides 2 voltages:

  • Output voltage 1 is –54 VDC
  • Output voltage 2 is +5Vaux

Because chassis components are powered by both A and B power inputs, the line card chassis can continue to operate normally if:

  • One AC or DC power module fails
  • One input power (A or B) fails
  • One internal bus bar fails
  • One entire power shelf fails
  • Power modules are added to, or removed from the power shelf

Because no exact redundancy exists across the power modules, individual power modules can be removed without causing the chassis to lose power.

Individual chassis components have power-related devices, such as OR-ing diodes, inrush control circuits, and EMI filters. Because any power modules can power all chassis components, these devices can be inserted or removed (OIR) while the chassis is online. This component insertion and removal is also called hot-swapping .

The modular configuration AC power shelf has the following input VAC power requirements:

  • Single-phase, 200 to 240 VAC nominal, 50 to 60 Hz, 16 A
  • Each power shelf contains three IEC-320-C22 receptacles which can accept up to three IEC-320-C21 connector female plugs, depending on how many AC PMs are installed in the shelf.

Note In order to maintain a balanced 3-phase power load, three AC PMs are required to be installed in a Cisco CRS 8-slot line card chassis AC modular configuration power shelf.


For additional power details, see Appendix A, “Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Specifications.”

Modular Configuration AC Power Shelf

The AC power shelf is the enclosure that houses the AC power modules and power distribution connections and wiring. The AC power shelf, shown in Figure 2-18, is installed in the Cisco CRS 8-slot line card chassis from the front and plugs into the chassis power interface connector panel.

Figure 2-18 Modular Configuration AC Power Shelf

 


Note The power cables for the power shelves do not come pre-attached.


Modular Configuration AC Power Module

The AC power module is an AC power module that converts single phase input AC power into the DC power necessary to power chassis components.

The AC power module (see Figure 2-19) takes input AC power from the power shelf, converts the AC into DC, provides filtering and control circuitry, provides status signaling, and passes the DC power to the chassis midplane.

Figure 2-19 Modular Configuration AC Power Module

 

Each power module has its own power connector to connect input AC power. The input AC power for each power module is as follows:

  • Each AC power module has a single-phase, 3-wire connection:
    Input: 200 to 240 VAC, 50 to 60 Hz, 16A.
    Tolerance: +/-10%(180 to 264) VAC, 50 to 60 Hz, 16A.
  • A 3-pin IEC-320 C21 90 degree female plug is inserted into a 3-pin IEC-320 C22 male plug at the rear of each power module.

The AC power enters the AC power at the rear of the power shelf. Once the power enters the AC power module, internal circuits rectify the AC into DC, filter and regulate it. Each AC power module provides two output voltages, as follows:

  • Output Voltage 1 is -54VDC at 55.5A
  • Output Voltage 2 is +5V at 0.75A

Each AC power module contains an ID EEPROM that stores information used by control software (for example, part number, serial number, assembly deviation, special configurations, test history, and field traceability data).

Figure 2-17 is a diagram of the connections between the modular configuration AC power shelves and the Cisco CRS 8-slot line card chassis. See the Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Installation Guide for detailed information about the input power connections to the AC power shelf.

Each AC power shelf supports up to three AC power modules. The AC power modules convert AC power into DC power, provide filtering, and then distribute the DC power to the chassis midplane. The power shelf also has a service processor module that monitors the condition of each AC power module and provides status signals that indicate the health of the power supplies.

Modular Configuration AC Power Module Indicators

The following three LED status indicators are located on the front of each AC power module:

  • Input OK - Green
  • Output OK - Green
  • Internal Fault - Red

Table 2-11 lists the power module status indicators and their functions.

Table 2-11 AC Power Module Status Indicators

Name
Color
Function

Input OK

Green

Input OK LED turns on continuously when input voltage is present and within the regulation range.

Input OK LED flashes when input voltage is present but not within the regulation range.

Input OK LED is off when input voltage is not present.

Input OK LED flashes when hot-unplugging the power module from the power shelf to indicate that there is energy in the power module until the input bulk capacitor is completely discharged or the housekeeping circuit is shut down.

Output OK

Green

Output OK LED turns on continuously when power module output voltage is on.

Output OK LED flashes when power module output voltage is in a power limit or an overcurrent situation.

Internal Fault

Red

Internal Fault LED turns on continuously when there is an internal fault in the power module.

The Internal Fault LED on the AC power module is turned on continuously to indicate that one or more of the following internal faults is detected inside the power module:

  • 5V out of range
  • Output Stage OT
  • Fan Fault
  • OR-ing fault (Output voltage less than bus voltage)
  • OC shutdown
  • OT shutdown
  • OV shutdown
  • Input stage OT
  • Fault induced shutdown occurred
  • Thermal sensor fault
  • Vout out of range
  • Boost Vbulk fault

Once all of the faults have been removed and the power module is operating normally, the Internal Fault LED is turned off.

Cisco CRS 3-Phase AC Power Distribution Unit

This section describes the Cisco CRS Power Distribution Unit (PDU). The PDU converts 3-phase AC input power to single-phase AC output power that connects directly to the rear of the modular configuration AC power shelf.


Note The PDU referred to in this document is different from the fixed configuration PDU.


The AC PDU includes either an AC Delta or AC Wye power interface, and has power input and power output cords entering and exiting the box. The PDU can be installed in a 19-inch rack or other locations, depending on the PDU type, by using chassis mounting brackets. In this section, single PDU refers to the individual PDU that converts 3-phase AC input power to single-phase AC output power.

A PDU kit refers to all the components that are required to be installed in a redundant CRS system. A PDU kit contains 2 single PDUs and any necessary mounting brackets or hardware. When ordering a Cisco CRS system, a PDU kit Product ID should be ordered.

Cisco Product ID numbers for PDU kits are as follows:

  • CRS-8-PDU-Delta—Redundant 3-phase to single-phase Delta PDU for Cisco CRS 8-slot line card chassis, 2 input/6 output
  • CRS-8-PDU-Wye—Redundant 3-phase to single-phase Wye PDU for Cisco CRS 8-slot line card chassis, 2 input/6 output

Figure 2-20 shows the Power Distribution Unit 8D ((Cisco product number PDU-321-3-Delta)) that converts 3-phase AC Delta input power to single phase output power.

Figure 2-20 Cisco CRS-8-PDU-Delta

 

 

1

Rack mounting ears

2

Rack Tray

3

Input Cord

4

Output Cords

Figure 2-21 shows the Power Distribution Unit 8W (Cisco product number PDU-321-3-Wye) that converts 3-phase AC Wye input power to single phase output power.

Figure 2-21 Cisco CRS-8-PDU-Wye

 

 

1

Rack mounting ears

2

Rack Tray

3

Input Cord

4

Output Cords

The PDU for the CRS 8-slot line card chassis is shipped with the following hardware for specific configurations:

  • Two single AC Delta PDUs with 19 inch rack tray. Each AC Delta PDU has one power input and three outputs.
  • Two single AC Wye PDUs with 19 inch rack tray. Each AC Wye PDU has one power input and three outputs.

For PDU specifications, see the Cisco CRS 3-Phase AC Power Distribution Unit Installation Guide , the section Specifications .