CloudEngine Series Switches FAQs-3.2 Power Module

CE12800

Power redundancy modes for the CE12800 series switches

Power modules in a CE12800 series switch can work in N+N backup, N+1 backup, or N+0 mode. To ensure power reliability, it is recommended that you use the N+N backup mode and connect the power modules to two power supply systems. In this way, the switch will not be powered off or restart if one power supply system fails.

NOTE:

N is the number of power modules configured based on actual power consumption of a chassis. The maximum power capacity of the system is the total maximum output power of N power modules.

• N+N backup: N power modules supply power for the chassis, and N power modules work as backup to implement power redundancy.
• N+1 backup: N power modules supply power for the chassis, and one power module works as backup to implement power redundancy.
• N+0 (no backup): N power modules supply power for the chassis, and no power module works as backup.

The CE12800 series switches do not support the PoE function.

Power module configuration modes for the CE12800 series switches

Configuration of power modules varies depending on the power redundancy mode:

• In N+N backup mode, power module (PM) slots in the chassis are divided into area A and area B, and power modules in the two areas work as a hot backup for each other, as shown in Slot layout in the CE12804 chassis, Slot layout in the CE12808 chassis, Slot layout in the CE12812 chassis, Slot layout in the CE12816 chassis, Slot layout in the CE12804S chassis, Slot layout in the CE12808S chassis, Slot layout in the CE12804E chassis, Slot layout in the CE12808E chassis, and Slot layout in the CE12804E chassis. To use the N+N backup mode, install N power modules in the PM slots in area A, and the other N power modules in the PM slots in area B. For example, to use the 4+4 backup mode in a CE12812 chassis, install four power modules in any four slots among PM1, PM2, PM5, PM6, PM9, and PM10, and the other four power modules in any four slots among PM3, PM4, PM7, PM8, PM11, and PM12.
• In N+1 backup or N+0 mode, power module slots are not divided into two areas for backup, and N+1 or N power modules can be installed in any PM slots. However, you are advised to install (N+1)/2 or N/2 power modules in area A and the other power modules in area B. (Here, area division used in the N+N backup mode is mentioned only for convenience of description. Actually, area A and area B do not back up each other.) If N+1 or N is an odd number, the redundant one can be installed in either area A or area B.
  • For example, to use the 6+0 mode in a CE12812 chassis, you are advised to install three power modules in any three slots among PM1, PM2, PM5, PM6, PM9, and PM10, and the other three power modules in any three slots among PM3, PM4, PM7, PM8, PM11, and PM12.
  • To use the 6+1 backup mode in a CE12812 chassis, you are advised to install four power modules in any four slots among PM1, PM2, PM5, PM6, PM9, and PM10, and the other three power modules in any three slots among PM3, PM4, PM7, PM8, PM11, and PM12. Alternatively, install three power modules in any three slots among PM1, PM2, PM5, PM6, PM9, and PM10, and the other four power modules in any four slots among PM3, PM4, PM7, PM8, PM11, and PM12.

CE8800&7800&6800&5800

The CE8800&7800&6800&5800 series switches have two power module slots, in which pluggable power modules can be installed to provide power to the chassis. A chassis can use one or two power modules. Double power modules can provide higher reliability.

The CE8800&7800&6800&5800 series switches support double power modules working in 1+1 backup mode.

• When both power modules are working normally, each of them provides half of the power required for the chassis.
• When one power module fails, the other one provides all power required for the chassis.

NOTE:

• If only one power module is installed in a switch, the switch generates power module absence alarms for the idle power slots.
• Failure of a single power module does not affect operations of the switch but will degrade the reliability of the switch.

All power modules are hot swappable. The CE8800&7800&6800&5800 series switches do not support the PoE function.

NOTE:

Power modules in a chassis must have the same power and same heat dissipation method.

CE12800

The AC power cables applicable to the CE12800 series switches depend on the type of power sockets used in your equipment room. Two types of AC power cables are available to suit different power sockets: PDU power cable and country-specific power cable.

• PDU power cables are delivered with a power distribution unit (PDU) with C20 straight sockets. A PDU power cable has a C19 straight female connector at one end and a C20 straight male connector at the other end, as shown in Figure 3-21.
• Country-specific power cables are delivered in compliance with standards of the destination country or region. For example, AC power cables used in China have PI angle male connectors, as shown in Figure 3-22.

If PDUs with C20 straight sockets are available in a cabinet, use PDU power cables complying with local standards.

If there is no PDU with C20 straight sockets in a cabinet, use power cables specific to the country or region where the switch is used.

Figure 3-21  PDU power cable and PDU

Figure 3-22  China-specific power cable and power strip

Connection

An AC power cable transmits AC power to a chassis and allows maximum current of 16 A. An AC power cable is connected in the following way:

• The C19 straight female connector is connected to a socket on the power distribution unit at the rear of the CE12800 chassis.
• The country-specific connector or C20 straight male connector at the other end is connected to an external power outlet.

CE8800&7800&6800&5800

AC power cables applicable to the CE8800&7800&6800&5800 series switches include PDU power cables (C13 straight female to C14 straight male) and country-specific power cables (C13 straight female to PI straight male). The two types of AC power cables differ in the connector used to connect to the power outlet.

• 150 W/350 W/600 W AC power modules: The AC power sockets or directly connected circuit breakers must have a current rating of 10 A.
• 350 W DC power modules: The directly connected circuit breakers must have a current rating of 16 A.
• 600 W/1200 W AC&240 V DC power modules: The AC power sockets or directly connected circuit breakers must have a current rating of 10 A.
• 600 W/1200 W high-voltage DC power modules: The directly connected circuit breakers must have a current rating of 10 A.

NOTE:

When 110 V power input is provided to a 1200 W AC&240 V DC power module, the AC power socket or directly connected circuit breaker must have a current rating of 16 A.

If a switch uses two power modules for 1+1 power redundancy, the superior circuit breaker for the power distribution box or PDU to which the power modules are connected must have a current rating of 25 A.

The AC power cables delivered with a switch must comply with the standards used in the delivery destination.

CE12800

Power modules for the CE12804/CE12808/CE12812/CE12816/CE12804S/CE12808S switch does not have a power switch. There are two power switches on the front panel of the chassis to control power supply to the chassis (except the CE12804S). It is recommended to turn on both switches to power on the device. Both switches must be turned off to power off the device.

Power modules for the CE12804E/CE12808E/CE12816E switch have a power switch.

CE8800&7800&6800&5800

Some power modules for the CE8800&7800&6800&5800 switches have a power switch, as listed in Table 3-8.

Power Module Indicators of CE12800 Series Switches

Table 3-9 lists the indicators on 2700 W AC and 3000 W AC&high-voltage DC power modules and describes the meaning of each indicator state.

Table 3-10 lists the indicators on a 2200 W DC power module and describes the meaning of each indicator state.

Power Module Indicator of CE8800&7800&6800&5800 Series Switches

Table 3-11, Table 3-12, Table 3-13, Table 3-14, and Table 3-15 describe the indicator on AC, DC, and high-voltage DC power modules of the CE8800&7800&6800&5800.

Differences between PM and PEM are:

• A PM is a power module used to supply power to the equipment. Figure 3-23 shows the appearance of a PM.

  Figure 3-23  PM appearance
  

• A PEM is the power entry module on the chassis, an iron frame that provides power inputs to PMs and provides other functions such as wave filtering. Generally, a PEM is included in the chassis sales part. Figure 3-24 shows the appearance of a PEM.

  Figure 3-24  PEM appearance
  

The Hardware Configuration Tool helps you quickly calculate the number of power modules required in a CE12800 switch. The calculator is also integrated in the UniSTAR system.

You can also use the following formula to calculate the number of power modules required:

Minimum number of power modules required = Sum of maximum power consumption of all working modules in the switch/Maximum power of a single power module (integral part of the result) + 1

For example, a CE12808 switch uses 2700 W AC power modules and is configured with two CE-CMUAs, five CE-SFU08As, two CE-MPUAs, and two CE-L48XS-EC line cards. Based on the power consumption values of the cards provided in the "Cards" section of the CloudEngine 12800 Series Switches Hardware Description and the power consumption of the chassis (including fans) and power modules, the sum of maximum power consumption of all modules can be obtained: 2519 W. Therefore, a minimum of one 2700 W power module is required.

To ensure power reliability of a CE12800 switch, it is recommended that you use the N+N backup mode with double power supply systems so that the failure of a single power supply system will not cause power failure or restart of the switch. In the preceding example, the 1+1 backup mode is recommended.

China's national standard for high-voltage DC power supply was released in December 2011 and took effect in February 2012. The standard defines power supply with 240 V DC (192 V to 288 V). The International Electrotechnical Commission (IEC) released the 380 V DC (260 V to 400 V) power supply standard, ETSI EN 300 132-3-1 V2.1.1, in February 2012. Because the two standards were released not long ago and define different voltage ranges, power supply manufacturers have not released power supply products complying with the high-voltage DC power supply standards. All the manufacturers use AC power modules in 240 V DC power supply scenarios.

CE series AC chassis modules can work in a certain high-voltage DC voltage range. For security purpose, power modules of the switches provide overvoltage protection function and will cut off power supply when the input voltage exceeds the upper limit. The voltage protection function prevents damage to power modules or other dangers caused by abnormal input voltage. The voltage upper limit triggering overvoltage protection is larger than the maximum input voltage allowed by a power module.

The 240 V DC input standard has higher requirements for power module protection components and secure distance than the 220 V AC input standard. Current, AC power modules can work with 240 V DC power input.

CE series switches must use matching power modules. Using unmatched power modules may cause unexpected risks. The chassis and power modules adopt foolproof designs to prevent misuse of power modules.

For the mapping between CloudEngine chassis models and power modules, see the "Power Module" section in the Hardware Description.

In the N+1 backup mode, N power modules provide power supply, and one power module acts as a backup. If one power module fails, the redundant power module provides power supply to ensure normal operations of the switch.

In the N+N backup mode, N power modules provide power supply, and N power modules act as backups. Even if all the N primary power modules fail, the N redundant power modules can still ensure normal operations of the switch.

In the N+0 mode, N power modules provide power supply, and no redundant power module is available. If one power module fails and the total output of the other power modules is smaller than the actual power consumption of the switch, the switch cannot run normally.

The 2+2 power module configuration is supported as long as the output power of the power modules is sufficient for the switch.

All power modules of CE series switches are hot swappable.

All power cables are hot swappable if they are connected to matching power modules.