// 1394.h

typedef struct _IRB_REQ_SET_DEVICE_XMIT_PROPERTIES {
  ULONG fulSpeed;
  ULONG fulPriority;
} IRB_REQ_SET_DEVICE_XMIT_PROPERTIES;
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Windows Driver Kit DDI reference (ns-1394-_irb_req_set_device_xmit_properties)

_IRB_REQ_SET_DEVICE_XMIT_PROPERTIES structure

Description

This structure contains the fields necessary to carry out a SetDeviceXmitProperties request.

Members

`fulSpeed`

Specifies the maximum speed for transactions to the device. The possible speed values are SPEED_FLAGS_xxx, where xxx is the (approximate) transfer rate in megabits per second. Existing hardware supports transfer rates of 100, 200, and 400 Mb/sec.

Transfer Rate	Description
SPEED_FLAGS_100	100 Mb/s
SPEED_FLAGS_200	200 Mb/s
SPEED_FLAGS_400	400 Mb/s

Reserved.

Note In Windows 7 and later versions of Windows, you can specify new values higher speed and greater sized payloads. For more information, see New Flags for Speed and Payload Size and IEEE 1394 IOCTL Changes in Device Driver Interface (DDI) Changes in Windows 7.

`fulPriority`

Specifies the priority.

Remarks

By default, the maximum permitted transmission speed is the physical maximum. A driver should use this request to lower the maximum permitted speed.

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