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round trip delay (RTD)

Round Trip Delay(RTD) is the round trip time of a data packet in Ethernet, but also a method for load balancing.

  1. In local networks, the round trip delay is the maximum time that a data packet needs to be transmitted to the most distant station and back. The round-trip time is calculated from the signal propagation time of the network and the time required by the stations to listen to or forward the data packets.
    Signal propagation time in 10 Mbit/s

    Signal propagation time in 10 Mbit/s

    Ethernet For Ethernet according to IEEE 802.3, a maximum propagation time of 512 bit periods is defined. This value results from the minimum packet length of 64 bytes, which corresponds to 512 bits. For the classic Ethernet with 10 Mbit/s and a bit time of 100 ns, this results in the value of 512 ns. This is the time required by an Ethernet frame within a given network topology to travel to the most distant station and back. If this value is exceeded, the CSMA/ CD access method fails.
  2. Round Trip Delay (RTD) is a dynamic load balancing method in which the load balancer determines the amount of time it takes, for example, for a request to access a web page on different web servers. With this method, the web server with the fastest response time can be determined with which user requests can be processed as quickly as possible. The RTD time includes the response times of the servers, but also the Round Trip Time( RTT) of the network. The load balancer should make predictions for the response times under certain loads.
Englisch: round trip delay - RTD
Updated at: 01.01.2011
#Words: 258
Links: record type definition (NFC) (RTD), round trip time (RTT), data packet, Ethernet, method
Translations: DE

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