Showing papers on "Precision Time Protocol published in 2005"
21 Nov 2005
TL;DR: The design and implementation of two IEEE 1588 prototypes for wireless LAN (WLAN) are presented and the results achieved are fully comparable to those achieved with wired LAN implementations.
Abstract: IEEE 1588 is a standard for precise clock synchronization for networked measurement and control systems in LAN environment. This paper presents the design and implementation of two IEEE 1588 prototypes for wireless LAN (WLAN). The first one is implemented using a Linux PC platform and a standard IEEE 802.11 WLAN with modifications to the network device driver. The second prototype is implemented using an embedded WLAN development board that implements the synchronization functionality using an embedded processor with programmable logic device (PLD) circuits. The measured results show that 1.1 ns average clock offset can be reached on HW based implementation, while Linux PC network driver enables 660 ns with a standard WLAN. Although WLAN is an extremely difficult environment for the synchronization, the results achieved with the prototype are fully comparable to those achieved with wired LAN implementations
86 citations
Patent•
09 Sep 2005
TL;DR: In this article, a system and method for coordinating the actions of a plurality of devices via scheduling occurrence of the actions based on synchronized local clocks of the devices is presented, where time bombs can be scheduled on the devices to coordinate the occurrence of actions between the devices in accordance with the detonation times set for the respective time bombs.
Abstract: A system and method are provided which coordinate the actions of a plurality of devices via scheduling occurrence of the actions based on synchronized local clocks of the devices Thus, a plurality of devices are communicatively coupled via a communication network, and the devices have their local clocks synchronized to a high degree of precision, using IEEE 1588 (Precision Time Protocol),NTP (Network Time Protocol), or some other technique for synchronizing their local clocks "Time bombs" can be scheduled on the devices to coordinate the occurrence of actions between the devices in accordance with the detonation times set for the respective time bombs In certain embodiments, not only the detonation time, but also the respective action to be triggered upon detonation is programmable for each device The time bombs implemented on the various devices can be used to coordinate the operations of the various devices with a high degree of temporal precision