Administration Guide for Cisco Virtualization Experience Client 2112/2212 ICA Firmware Release 7.1_118
Cisco VXC 2112/2212 power considerations
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Cisco VXC 2112/2212 power considerations

Cisco VXC 2112/2212 power considerations

Power options

You can power the Cisco VXC 2112/2212 using a Cisco PWR-CUBE-4 power adapter or using standard Power over Ethernet (PoE). This appendix describes the Cisco VXC configurations that are supported by the IEEE 802.3af and IEEE 802.3at PoE standards, by Cisco Universal Power Over Ethernet (UPOE), and by the Cisco PWR-CUBE-4 power adapter.

Cisco VXC 2112/2212 USB ports are compliant with USB 2.0 standard specifications to deliver a maximum power level of 2.5 watts.

Available power on USB ports

The USB ports on the Cisco VXC 2112/2212 operate at two power levels:

  • Low: 0.5 watts
  • High: 2.5 watts

USB ports that operate at the low-power level can only power USB devices that consume up to 0.5 watts of power, and USB ports that operate at the high-power level can power USB devices that consume up to 2.5 watts of power.

USB ports on the Cisco VXC 2112/2212 that operate at high power cannot individually power any noncompliant USB accessory that requires more than 2.5 watts of power. To power devices that require between 2.5 and 5 watts of power, you can use a USB Y cable to connect the accessory to USB port 3 and 4 of the client (when these are operating at high power).

In addition, if no device is connected to a port, the Cisco VXC 2112/2212 cannot reallocate the available power from this port to a device on another port. For example, if USB ports 1 and 2 are operating at low power and no device is connected to port 2, the Cisco VXC 2112/2212 cannot redirect the power allocated to port 2 to power a high-power device on port 1. In this case, the maximum power limit on port 1 remains unchanged at 0.5 watts.

Low-power USB devices (0.5 watts or less) are typically keyboards, mice, and joysticks, while high-power USB devices (greater than 0.5 watts) are typically bus-powered cameras, hubs, and some USB Flash drives.

USB hub support

USB ports on the Cisco VXC 2112/2212 can power a USB hub provided the hub does not draw more power than is available from the USB port to which it is connected (that is, 0.5 watts on low-power ports or 2.5 watts on high-power ports).

PoE power negotation

The following sections describe the power negotiation process on the Cisco VXC 2112 and Cisco VXC 2212.

Cisco VXC 2112 PoE power negotiation

When the Cisco VXC 2112 is powered using PoE, the firmware performs a one-time negotiation of PoE power requirements at boot time and allocates the available power to the USB ports, power indicators, and monitors, as described in Cisco VXC 2112 power support. During normal operation, this power allocation does not change.

Cisco VXC 2212 PoE power negotiation

Unlike the Cisco VXC 2112, the Cisco VXC 2212 dynamically negotiates the PoE power allocation from the PoE switch, and allocates the power to the attached devices when they are connected or disconnected. Regardless of the total power that the Cisco VXC 2212 draws, the maximum power available to each USB port is as described in Cisco VXC 2212 power support.

Cisco VXC 2112 power support

The following table describes the power configurations that are supported on the Cisco VXC 2112.


Note


  • IEEE 802.3af PoE does not support Cisco VXC 2112 configurations.
  • IEEE 802.3at PoE does not support the Cisco VXC 2112 if a Key Expansion Module is attached to a Cisco Unified IP Phone 8961, 9951, or 9971.

As an alternative to PoE, the Cisco PWR-CUBE-4 power adapter can support a Cisco VXC 2112 attached to a Cisco Unified IP Phone 8961, 9951, or 9971 (with or without camera) with up to three Key Expansion Modules in a basic configuration (keyboard, mouse, and two monitors).

If you add one or more Key Expansion Modules to the Cisco Unified IP Phone 8961, 9951, or 9971, these modules may reduce the amount of power available to the Cisco VXC client and may cause additional restrictions for powering Cisco VXC peripheral devices.


Table 1 Cisco VXC 2112 power support
Cisco VXC 2112 with: Power Source USB Monitor Configuration
Port 1 keyboard Port 2 mouse Port 3 accessories Port 4 accessories DVI Port VGA Port
8961 802.3at Powered (low) Powered (low) Powered (low) Powered (low) Powered Powered Moderate
9951 without camera 802.3at Powered (low) Powered (low) Powered (low) Powered (low) Powered Powered Moderate
9951 with camera 802.3at Powered (low) Powered (low) Powered (low) Powered (low) Powered Powered Moderate
9971 without camera 802.3at Powered (low) Powered (low) Powered (low) Powered (low) Powered Powered Moderate
9971 with camera 802.3at Powered (low) Powered (low) Unavailable Unavailable Powered Powered Basic
8961/9951/9971 with or without camera UPOE Powered (high) Powered (high) Powered (high) Powered (high) Powered Powered Full
PWR-CUBE-4 Powered (high) Powered (high) Powered (high) Powered (high) Powered Powered Full

Note


If you change the power source on a Cisco VXC 2112 from PoE to a Cisco PWR-CUBE-4, you must reset the Cisco VXC for the new power allocations to take effect.


Cisco VXC 2112 LED behavior

The following table describes the behavior of the power button LED ring when you connect power (PoE or Cisco Power Cube 4) to the Cisco VXC 2112.

Table 2 Cisco VXC 2112 power button LED behavior

Power source

LED behavior when powered

IEEE 802.3at Top third of LED ring is lit
PWR-CUBE-4 or UPOE Full LED ring is lit

Cisco VXC 2212 power support

The following table describes the power configurations that are supported on the Cisco VXC 2212.


Note


  • The Unified IP Phone PC port can provide the network connectivity for the Cisco VXC 2212; however, it does not provide power for the device. A power adapter is required when you use the Unified IP Phone PC port for network connectivity for the Cisco VXC 2212.
  • 802.af PoE can support a Cisco VXC 2212 only in a basic configuration.

Table 3 Cisco VXC 2212 power support
Power Source USB Monitor
Port 1 keyboard Port 2 mouse Port 3 accessories Port 4 accessories DVI Port VGA Port Configuration
802.3af Powered (low) Powered (low) Unavailable Unavailable Powered Powered Basic
802.3at Powered (high) Powered (high) Powered (high) Powered (high) Powered Powered Full
UPOE Powered (high) Powered (high) Powered (high) Powered (high) Powered Powered Full
PWR-CUBE-4 Powered (high) Powered (high) Powered (high) Powered (high) Powered Powered Full

Cisco VXC 2212 base LED behavior

The following table describes the behavior of the base LEDs when you connect power (PoE or Cisco Power Cube 4) to the Cisco VXC 2212.

Table 4 Cisco VXC 2212 base LED behavior
Power source Client connected to power source (PoE or Power cube) Press power button for power-on (quick button press - no more than 1/2 second) Press Power button again for power-off (hold minimum 3 seconds)
IEEE 802.3af PoE No light Dim white light Light turns off
IEEE 802.3at PoE No light Dim white light Light turns off
Cisco UPOE No light Dim white light Light turns off
Cisco Power Cube 4 (plugged in AFTER network cable) Initial white light flash, then light turns off Dim white light, which becomes a bright white light after approximately 10 seconds Light turns off
Cisco Power Cube 4 (plugged in BEFORE network cable) No light Dim white light, which becomes a bright white light after approximately 10 seconds Light turns off

Power consumption

The following table describes the power consumption on the Cisco VXC 2112/2212.

Table 5 Cisco VXC 2112/2212 Power consumption
Zero Client Minimum Power Consumption Maximum Power Consumption
Cisco VXC 21121 12 watts 24 watt
Cisco VXC 2212 12 watts 24 watts
1 The values listed indicate the power consumption for the zero client only. When the Cisco VXC 2112 is attached to a Cisco Unified IP Phone, you must add the phone power consumption to calculate the total power consumption of the system.