Table of Contents
Cisco ICS 7750 Power Information
This chapter provides guidelines for using various power supply options with the Cisco ICS 7750. This chapter includes the following sections:
This section describes guidelines for using power supplies with the Cisco ICS 7750.
- One uninterruptible power supply (UPS) can support one of the following configurations:
- One Cisco ICS 7750 and two Catalyst switches (see Figure 3-13)
- Three Cisco ICS 7750 systems (no Catalyst switches)
- One Cisco 300 RPS provides redundant power for one Catalyst switch.
- One dedicated wall power-outlet can support one of the following configurations:
- One Cisco ICS 7750 and two Catalyst switches
- Three Cisco ICS 7750 systems (no Catalyst switches)
Figure 4-1 shows a recommended power configuration that uses two UPSs and a Cisco Redundant Power System (RPS) 300 to provide backup power to the Cisco ICS 7750 and to five connected Catalyst 3524-PWR XL switches.
Figure 4-1: Recommended Power Configuration for the Cisco ICS 7750 with Five Catalyst Switches
Table 4-1 describes additional power-supply configurations.
Table 4-1: Power Supply Configurations
| Power Supply Modules
| Switches
| UPS
| RPS
| Comments
|
|---|
1
| 5
| 0
| 0
| - No backup power for system.
- No backup power for subsystem cards.
- No backup power in case of a temporary loss of an AC circuit.
|
2
| 5
| 0
| 0
| - System has backup power.
- Any switch with a failed internal power supply fails.
- No backup power in case of a temporary loss of an AC circuit.
|
1
| 5
| 0
| 1
| - No backup power for system.
- Switches have N+1 backup power.
- Redundant power supply for the switches.
- No backup power in case of a temporary loss of an AC circuit.
|
2
| 5
| 0
| 1
| - System has backup power.
- Switches have N+1 backup power.
- Redundant power supply for the switches.
- Temporary loss of an AC circuit results in the loss of two switches if the RPS has its own power source.
|
1
| 5
| 2
| 1
| - System has backup power.
- System goes down if the power supply fails.
- Switches have N+1 backup power.
- Temporary loss of an AC circuit is backed up by the UPS.
|
1
| 5
| 2
| 0
| - No backup power for subsystem cards.
- Any temporary loss of an AC circuit is backed up by the UPS (system chassis only).
|
2
| 5
| 2
| 0
|
|
This section describes the power supplies that are used in various combinations with the Cisco ICS 7750.
The power supply for the Cisco ICS 7750 is a hot-swappable module. It operates in both a single or redundant configuration. A signal pin on the power connector provides the automatic remote enable/disable signal to the power supply during the hot insertion or removal operation. This feature ensures the power supply remains off until fully seated and also turns the power supply off before any power pins break contact during a removal procedure.
The power supply module has four outputs: +5V, +3.3V, +12V, and -12V. When there are two power supplies installed in the chassis, installing or removing one power supply or powering on or off one power supply has no affect on the outputs of the other power supply. This is true for both power supply positions.
The power supply module has the following features:
- Hot swapping support.
- Current sharing support when two power supplies are installed in a chassis.
- Four DC voltage outputs—+3.3V, +5V, 12V, and -12V.
- AC input range and operation—100-240 VAC.
- Input connection—IEC 320-C14 AC input receptacle.
- Overvoltage protection—Power supply shuts down if power output exceeds the nominal output by 120 percent.
- Automatic thermal shutdown—If ambient temperature is too high, the power supply shuts down automatically and, once ambient temperature returns to a safe operating range, restarts automatically.
- Automatic redundancy (when two power supplies are installed in the chassis).
Figure 4-2 illustrates the power supply module, and Table 4-2 describes the front-panel LEDs and features.
Figure 4-2: Power Supply Module
Table 4-2: Power Supply LEDs
| LED
| Description
|
|---|
AC OK
| - Solid green when AC power is being supplied to the chassis.
- Off when AC power is not being supplied to the chassis.
|
DC OK
| - Solid green when DC power is being supplied to the chassis.
- Off when DC power is not being supplied to the chassis.
|
OVERTEMP
| - Solid green when there is a problem with a system fan or when the system is overheating.
- Off when there are no fan or temperature problems.
|
The UPS provides the following support for the Cisco ICS 7750:
- Prevents blackouts, brownouts, sags, and surges from reaching the Cisco ICS 7750.
- Filters small fluctuations from the utility line.
- Prevents large disturbances on the utility line from reaching the Cisco ICS 7750 by internally disconnecting from the utility line and supplying internal battery power until the utility line returns to normal operation.
- If utility power does not return to normal operation, the UPS continues to supply power from its internal batteries.
 |
Note For more information about the UPS and its battery packs, refer to the User's Manual APC Smart-UPS. |
The Cisco RPS 300 has one AC input power module and six DC power output power modules for connection to external devices. The RPS provides redundant power to the Catalyst switches that are connected to the Cisco ICS 7750.
The RPS can be connected to up to six devices as a redundant power source. If there is a power failure in one of the connected devices, the RPS supplies power to the device immediately, with no interruption of operation. If the RPS is actively supplying power to one of the connected devices, it can no longer provide redundant power to the other connected devices. For full redundancy, each switch in the Cisco ICS 7750 system should be connected to a separate RPS.
Figure 4-3 illustrates the rear panel of the Cisco RPS.
Figure 4-3: Cisco RPS 300 Rear Panel
The following features are standard on the Cisco RPS 300:
- One AC input power cord
- One AC input power connector
- Six 300W DC output power connectors
- 19-inch rack-mountable chassis (rack-mount brackets included)
- Cooling fan (blower)
- Front panel LEDs for AC, DC, fans, and temperature status
- Quick switchover capability to ensure that a failed power supply does not cause a device reboot
- Simple Network Management Protocol (SNMP) support of error messages
For detailed information on the Cisco RPS, refer to the Cisco Redundant Power System 300 Hardware Installation Guide.
Posted: Mon Oct 2 13:29:33 PDT 2000
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