Browse Definitions :
Definition

line of sight (LOS)

Line of sight (LOS) is the level of obstruction on the path between two points.

The level of obstruction in a LOS determines not only the visibility from one point to another but also the quality of signal reception for wireless transmissions, such as Wi-Fi. Clear LOS is necessary for infrared wireless networking or LED-based Li-Fi.

Analysis of line of site is particularly important for planning wireless network deployment. A clear line of site between two antennas is ideal for the best reception. However, a radio signal can permeate and bend or bounce around some obstruction, unlike line of sight for an eye. LOS is often categorized with separate abbreviations for the different levels of obstruction. A fully open path is the situation abbreviated as LOS. A near line of site with partial obstructions is abbreviated as nLOS and a completely blocked non-line of sight as NLOS.

Radio frequencies penetrate more materials than photons but this penetration is not uniform and depends on density of the materials or having holes large enough for the radio waves to penetrate. A wood wall is much easier penetrated by radio than concrete, for example, and metals are even less penetrable. The dependency on density means that a clear LOS matters and that if there are any obstructions, what those obstructions are made of matters as well.

To improve the performance of a wireless network, reducing the amount of equipment required and thus the cost, it’s important to carefully consider LOS obstructions and their materials, as well as interfering networks and radio noise from other electronic and mechanical equipment around wireless gateways or antennas.

This was last updated in January 2017

Continue Reading About line of sight (LOS)

SearchNetworking
  • virtual network functions (VNFs)

    Virtual network functions (VNFs) are virtualized tasks formerly carried out by proprietary, dedicated hardware.

  • network functions virtualization (NFV)

    Network functions virtualization (NFV) is a network architecture model designed to virtualize network services that have ...

  • overlay network

    An overlay network is a virtual or logical network that is created on top of an existing physical network.

SearchSecurity
  • X.509 certificate

    An X.509 certificate is a digital certificate that uses the widely accepted international X.509 public key infrastructure (PKI) ...

  • directory traversal

    Directory traversal is a type of HTTP exploit in which a hacker uses the software on a web server to access data in a directory ...

  • malware

    Malware, or malicious software, is any program or file that is intentionally harmful to a computer, network or server.

SearchCIO
  • security audit

    A security audit is a systematic evaluation of the security of a company's information system by measuring how well it conforms ...

  • chief transformation officer (CTO)

    Chief transformation officer is an executive role, often in the C-suite, that focuses on bringing about change as well as growth ...

  • data latency

    Data latency is the time it takes for data packets to be stored or retrieved. In business intelligence (BI), data latency is how ...

SearchHRSoftware
SearchCustomerExperience
  • implementation

    Implementation is the execution or practice of a plan, a method or any design, idea, model, specification, standard or policy for...

  • first call resolution (FCR)

    First call resolution (FCR) is when customer service agents properly address a customer's needs the first time they call.

  • customer intelligence (CI)

    Customer intelligence (CI) is the process of collecting and analyzing detailed customer data from internal and external sources ...

Close