Oslo, Norway
Oslo, Norway

Time filter

Source Type

Holmeide O.,OnTime Networks AS | Schmitz M.,OnTime Networks AS
Proceedings of the International Telemetering Conference | Year: 2015

Digital data distribution systems are widely used in Aerospace and Defense products to allow devices to communicate with one another. In many cases it is desirable to monitor the data traffic flowing between two points in a copper or fiber based Operational or Onboard Network System (ONS) for Flight Test Instrumentation (FTI) purposes because these ONS systems may carry important data which can be used without duplicating/installing a specific FTI data acquisition system to receive this data. The two types of network taps that can be used are Inline Network Taps and network end-point taps. This paper examines the usage of Inline Network Taps for FTI applications and how they can support network access strategies and objectives. An Inline Network Tap is a hardware device which allows access to data flowing across a network. These devices are typically active/powered and have a number of ports: a first tap port, a second tap port, and one or more mirror ports. An in-line network tap inserted between the first and second tap port passes all data traffic through unimpeded but also copies that same data to one or more mirror ports. Some Inline Network Tap devices may also pass packets when the tap is not powered or a malfunction is detected on the device via an integrated by-pass function. If the Inline Network Tap device goes offline the unit automatically bypasses the tap connection and data traffic is directed through the bypass directly to network devices. This capability is crucial for inline usage on mission critical network segments that cannot afford the risk of losing the network connection. An in-line network tap can either be based on copper or fiber technology and as a "filterable" network tap can also provide advanced packet filtering capabilities. These filterable network taps can selectively pass data, e.g., based on VLAN ID or other parameters, to a mirror port for deep analysis, monitoring and recording. Another advanced tap function that is presented in this paper is the support for inserting time stamps at the tap level in monitored packets which provides a reference time when the data content of a given packet was generated at a data source1. This capability is a significant feature for FTI applications as most ONS systems do not provide time stamped data.


DALLAS, Nov. 15, 2016 /PRNewswire/ -- OnTime Networks, a global leader for rugged, time synchronized Ethernet solutions for the Aerospace and Defense Industry, announced today the expansion of its military-grade Gigabit Ethernet switch portfolio with the new CloudberryMIL CM-5000 Series....


DALLAS, Nov. 7, 2016 /PRNewswire/ -- OnTime Networks, a global leader for rugged, time synchronized Ethernet solutions for the Aerospace and Defense Industry, announced today the expansion of its military-grade Gigabit Ethernet switch portfolio with the new CloudberryMIL CM-6200 Series....


Holmeide O.,OnTime Networks AS | Gauvin J.-F.,OnTime Networks AS
Proceedings of the International Telemetering Conference | Year: 2014

Network loads close to Ethernet wire speed and latency sensitive data in a Flight Test Instrumentation (FTI) system, represent challenging requirements for FTI network equipment. Loss of data due to network congestion, overflow on the end nodes, as well as packet latency above a few hundred microseconds, can be critical during a flight test. To avoid these problems, several advanced packet filtering and network optimization functions are required in order to achieve best possible performance and thus avoid loss of data. This paper gives insight into how to properly engineer an Ethernet based FTI network and how to use advanced Ethernet switch techniques such as Quality of Service (QoS) and rate shaping.


Holmeide O.,OnTime Networks AS | Gauvin J.-F.,OnTime Networks AS
45th Annual International Symposium of the Society of Flight Test Engineers 2014 | Year: 2014

Today's modern flight test systems are based to a large extent on Ethernet technologies. The never ending demand for increased bandwidth and speed also rises the need for clever packet filtering solutions on the Ethernet switches. The challenge is to avoid network bottlenecks and to ensure that Ethernet end nodes are not overwhelmed with data not meant for the given node. This paper describes the different packet filtering methods and how these techniques can be optimized for Flight Test Instrumentation (FTI) use.


Lefevre D.,Zodiac Data Systems | Cranley N.,Zodiac Data Systems | Holmeide O.,OnTime Networks AS
Proceedings of the International Telemetering Conference | Year: 2013

A Flight Test Instrumentation (FTI) system may consist of equipment that either supports PTPv1 (IEEE 1588 Std 2002) or PTPv2 (IEEE 1588 Std 2008). The challenge in such time distributed system is the poor compatibility between the two PTP protocol versions. This paper describes how to combine the PTP versions in the same network with minimum or no manual configuration.


Patent
OnTime Networks AS | Date: 2015-03-25

Digital communications receive signals from the network tap represent tapped data. The tapped data is forwarded to a time stamp module. The time stamp module generates a time stamp and inserts the time stamp in each packet body. The time stamp represents a time when data packet content is considered to be generated at a sending node from which the tapped data originates. A packet time-stamped in this manner is then forwarded to one or more receivers, such as the recorder for additional processing. One such processing may be a performance measurement based at least in part on the time stamp that, as described, represents the time at which data packet content is considered to have been generated by the sending node. The network tap may be filterable, and either copper-based or a fiber tap.

Loading OnTime Networks AS collaborators
Loading OnTime Networks AS collaborators