Specifications

Remote Control and Receiver-Transceiver Specifications and Requirements

for Windows Media Center in Windows Operating Systems

 Support independent IR transmitter jacks (2 minimum).

 IR emitter cable should be a minimum of 2 meters in length.

 IR emitters are adhesive.

 IR emitters will provide the consumer with a visible LED.

 Support the Modulated IR mode. Modulated mode transmits a signal modulated with a 30-60 kHz

carrier with a sampling resolution of 50 μsec.

Pulse Mode Remotes

Pulse mode is no longer required.

System-Level Interaction Requirements

The following list provides system-level interaction requirements.

 Must resume from standby mode using the Sleep button for the particular IR protocol for which

the hardware is optimized. Resume-from-standby must do hardware decoding of the protocol and

operate when the Windows Media Center computer is in a state of lower power consumption.

 Able to wake from S1 or S3. Resuming or waking from S4 or S5 is optional.

 Receiver module should flash the LED when receiving IR.

Important This is highly recommended as a key user scenario.

 Must properly indicate a user presence to the operating system when waking the system. This

can be tested by first waking the system with the remote control, and then by running a

scheduled task. The monitor should turn on when waking with the remote control, but not when

waking from running a scheduled task.

 Power consumption requirements are defined by the bus and architecture used by the IR

receiver. For example, USB allows 2.5 mA during suspend and a variable amount of current

depending on whether it is a high-power or lower-power device.

 If using a USB device, it is recommended that the device be able to operate correctly when it is

plugged into a passive hub.

Emulation Requirements

This section describes how to build a USB consumer infrared receiver (CIR) for Windows Media

Center in the next version of Windows. These devices use the IR Transceiver Version 2 or IR

Receiver Version 3 wire (USB) protocol, but not the IR Transceiver Version 2 or IR Receiver

Version 3 bill of materials. They are referred to as IR emulation devices.

Host System Requirements

Emulation devices are only supported by Windows Vista and future operating systems. Devices

built according to this information are not supported for and will not work on Windows XP Media

Center Edition.

To develop and test this functionality, you will need a Windows Vista or later operating system.

Device Driver Usage

IR emulation devices use the in-box Windows CIR device drivers, including usbcir.sys,

circlass.sys, and hidir.sys. No device driver development is necessary to create an IR emulation

device.