Disclosed are methods and apparatus for multiplex operation of an electronic transmitting apparatus, comprising establishing logical channels between logical data producers and respective logical data consumers, the logical channels operable to pass data over a serial physical channel, constructing by a producer a payload, identifying a respective consumer, arbitrating use of the serial physical channel between logical channels to control sending of payloads, injecting a channel-specific logical protocol stop indicator into a data flow over the serial physical channel to instruct a receiving router to stop receipt of a previously started data flow and route the payload to a consumer, and sending at least a first uninterruptible data unit of the payload over the serial physical channel. Corresponding methods and apparatus are provided to enable a receiver to route payloads to consumers according to received logical protocol stop indicators.

The present disclosure relates generally to serial communication links and, more specifically, to events communicated on serial communication links and the timing of those events. The events may be communicated according to a prioritization process.

Aspects include acquiring measurement data of a synchronous input/output (I/O) link between an operating system and a recipient. The acquiring measurement data can include monitoring operating system usage of synchronous I/O commands on the synchronous I/O link and storing the operating system usage in a measurement block as the measurement data. Further, the measurement block is accessible by the operating system to determine that the measurement data is acquired.

Aspects include acquiring measurement data of a synchronous input/output (I/O) link between an operating system and a recipient. The acquiring measurement data can include monitoring operating system usage of synchronous I/O commands on the synchronous I/O link and storing the operating system usage in a measurement block as the measurement data. Further, the measurement block is accessible by the operating system to determine that the measurement data is acquired.

Aspects include acquiring measurement data of a synchronous input/output (I/O) link between an operating system and a recipient. The acquiring measurement data can include monitoring operating system usage of synchronous I/O commands on the synchronous I/O link and storing the operating system usage in a measurement block as the measurement data. Further, the measurement block is accessible by the operating system to determine that the measurement data is acquired.

Aspects include acquiring measurement data of a synchronous input/output (I/O) link between an operating system and a recipient. The acquiring measurement data can include monitoring operating system usage of synchronous I/O commands on the synchronous I/O link and storing the operating system usage in a measurement block as the measurement data. Further, the measurement block is accessible by the operating system to determine that the measurement data is acquired.

A data transmission method includes: determining a sum of first service proportions and a sum of second service proportions according to a first transmission rate of at least one first device, a second transmission rate of at least one second device, and a maximum bandwidth of a host transmission interface; determining at least one first service proportion of the first device according to the sum of the first service proportions, and determining at least one second service proportion of the second device according to the sum of the second service proportions; and transmitting at least one package of first transmission data of the first device and at least one package of second transmission data of the second device to a host via the host transmission interface according to the first service proportion and the second service proportion.

A data transmission method includes: determining a sum of first service proportions and a sum of second service proportions according to a first transmission rate of at least one first device, a second transmission rate of at least one second device, and a maximum bandwidth of a host transmission interface; determining at least one first service proportion of the first device according to the sum of the first service proportions, and determining at least one second service proportion of the second device according to the sum of the second service proportions; and transmitting at least one package of first transmission data of the first device and at least one package of second transmission data of the second device to a host via the host transmission interface according to the first service proportion and the second service proportion.

Access to devices can be controlled dynamically. A device control driver can function as an upper filter driver so that it can intercept I/O requests that target a particular device. The device control driver can be configured to communicate with a device control server to dynamically determine whether the current user is allowed to access the particular device. The device control server can employ policy or administrator input to determine whether access should be allowed and can then notify the device control driver accordingly. When access is granted, the device control driver can pass I/O requests down the device driver stack. Otherwise, the device control driver can block the I/O requests. Also, when access is granted, the device control server can specify a permission expiration time after which the device control driver should again resume blocking I/O requests.

Access to devices can be controlled dynamically. A device control driver can function as an upper filter driver so that it can intercept I/O requests that target a particular device. The device control driver can be configured to communicate with a device control server to dynamically determine whether the current user is allowed to access the particular device. The device control server can employ policy or administrator input to determine whether access should be allowed and can then notify the device control driver accordingly. When access is granted, the device control driver can pass I/O requests down the device driver stack. Otherwise, the device control driver can block the I/O requests. Also, when access is granted, the device control server can specify a permission expiration time after which the device control driver should again resume blocking I/O requests.