The Cisco CRS 8-slot
Line Card Chassis Enhanced router modular configuration AC power system can
provide up to 9,000 W to power the Cisco CRS 8-Slot Line Card Chassis Enhanced
router.
 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 Enhanced router 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.
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 the
Cisco CRS 3-Phase AC Power
Distribution Unit Installation Guide or to the
Cisco CRS Carrier
Routing System 8-Slot Line Card Chassis Enhanced Router Installation Guide
.
The following figure
shows the power routing distribution of the 8-slot chassis with a modular AC
configuration power system.
Figure 8. CRS 8-Slot
Chassis Power Module - Modular AC Configuration
As shown in the
figure, 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 AC 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 Cisco CRS 8-slot Line
Card Chassis Enhanced router can continue to operate normally if:
- One 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
Due to the system
power architecture design (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 Enhanced router AC modular
configuration power shelf.
|
For additional power
details, see
Appendix A, “Technical
Specifications.”
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
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 10. 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).
#con_1241429/fig_1294667
is a diagram of the connections between the modular configuration AC power
shelves and the Cisco CRS 8-slot Line Card Chassis Enhanced router. See the
http://www.cisco.com/en/US/docs/routers/crs/crs1/8_slot/installation/guide/hqlcc_install.pdf Cisco CRS Carrier
Routing System 8-Slot Line Card Chassis Enhanced Router 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
The following table
lists the power module status indicators and their functions.
Table 3 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.