Passive Probe

Passive Probe

= Overview =

Passive probing is the process of acquiring control or data from a telecommunication or data network without disturbing the network being monitored. This ensures that applications using the probed data can do so without any threat to the operation of the observed network. This is particualrly important for network management / OSS applications where disturbing the observed network with active devices can itself affect network operation and destroy the value of the probed data.

Passive probing is also known as Non Intrusive monitoring, and also can refer to oscilliscope probes.

Types of Probe

Devices performing the probing can be of several forms, largely to meet the physical and transport configuration of the network they are attaching to. Probing is possible on electrical and optical bearers through tapping, optical splitters but is also common using specialised inline devices with failsafe modes. In ethernet networks, managed switches can also offer SPAN port packet duplication, but this is generically ineffcient both for the switch and the amount of data that may need to be collected.

The probes typically process the lower layers of the network protocol stacks, removing this information from the data passed on to the application. The lower layers often provide little value for the consuming application, although this is not universally true. Examples of transport layers which are typically removed include ATM, HDLC, MPLS , VLAN , MTPL2 , PPP, Frame Relay. In WAN environments, Inverse Multiplexed ATM, PPP Multilink are also common.

The probe therfore provides an application with network and technology independent access to the network data.

Applications

* Operations Support Systems ( OSS ). These systems offer operators data on how their network is peforming, and potential improvements
* Value Added Services ( VAS ) . Typically these services derive events from normal network operation and offer overlay services. An example of such a service is the Welcome Roamer application where a user roaming in a foreign PLMN is sent a text message by the serving PLMN to welcome the user to the network and advise them of useful short codes or local service
* Lawful Interception ( LI ) Lawful Interception [ [http://books.google.co.uk/books?id=0KQm1tywT3kC Book - Intelligence Support Systems - Technologies for Lawful Intercepts By Paul Hoffmann, Kornel Terplan] ] is typically implemented by means of on switch functionality, however, for many reasons use of a passive probe to achieve this is also a common choice.

Notes


Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Test probe — Typical passive oscilloscope probe being used for testing an integrated circuit. A test probe (test lead, test prod, or scope probe) is a physical device used to connect electronic test equipment to the device under test (DUT). They range from… …   Wikipedia

  • SS7 probe — is a physical device to obtain signalling and/or bearer information from a telecommunications network, such as a corporate telephone system. The probe passively monitors the E1/T1 or SDH/SONET bearers, and extracts the signalling information for… …   Wikipedia

  • Mechanical probe station — An automated probe station by Cascade Microtech A Mechanical probe station is used to physically acquire signals from the internal nodes of a semiconductor device. The probe station utilizes manipulators which allow the precise positioning of… …   Wikipedia

  • Wilkinson Microwave Anisotropy Probe — WMAP redirects here. WMAP may also refer to either radio station WXNC or WGSP FM. Wilkinson Microwave Anisotropy Probe General information NSSDC ID 2001 027A …   Wikipedia

  • Oscilloscope — This article is about current oscilloscopes, providing general information. For history of oscilloscopes, see Oscilloscope history. For detailed information about various types of oscilloscopes, see Oscilloscope types. Illustration showing the… …   Wikipedia

  • P-O-X — is a handheld electronic game released by Hasbro in 2001. The game includes both single player and multi player modes[1] and a 30 foot (9 m)[citation needed] wireless connection range. P O X was introduced through a viral marketing scheme. Hasbro …   Wikipedia

  • Monitoring and Measurement in the Next Generation Technologies — (MOMENT) is a project aimed at integrating different platforms for network monitoring and measurement to develop a common and open pan European infrastructure. The system will include both passive and active monitoring and measurement techniques… …   Wikipedia

  • 3D scanner — A 3D scanner is a device that analyzes a real world object or environment to collect data on its shape and possibly its appearance (i.e. color). The collected data can then be used to construct digital, three dimensional models useful for a wide… …   Wikipedia

  • New Horizons — For other uses, see New Horizons (disambiguation). New Horizons Operator NASA Major contractors Applied Physics Laboratory (APL) Southwest Research Institute (SwRI) …   Wikipedia

  • Plasma diagnostics — are experimental techniques used to measure properties of a plasma such as temperature and density. Langmuir probe Measurements with electric probes, called Langmuir probes, are the oldest and most often used procedures for low temperature… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”