Frame Relay is a data communication technology, which was originally developed as data shuttle-service for ISDN. In Europe frequently the basis stations of the GSM net, which lead up the radio signals of the mobile telephones received and to the fixed net, are tied up over Frame Relay. In addition, network carriers offer Frame Relay connections as the cheaper alternative to a dedicated line.

Frame Relay multiplext like X.25 and/or the Datex-P-Netz the data streams of different sending and/or slave stations after statistic criteria over a line and supported thereby speeds between 56 kBit/s and 34,816 Mbit/s. ways of its high similarity to X.25 is actually it its advancement with the ability to higher transmission rate.

Frequently Frame Relay with a guaranteed transmission rate (CIR von Committed information rate) and a brief excess is offered to transmission rate (EIR von Excess information rate).

A community with X.25 is that Frame Relay is likewise connectingoriented. For each participant its own virtual connection is developed.

A substantial difference to X.25 exists in the error correction mechanisms. X.25 was originally developed for the transmission of data over voice grade channels, which have rarely better error rates as 1:10.000. Therefore X.25 has complex mechanisms to the correction the transmission of falsified data blocks repeated by errors and for. Frame Relay does not have these mechanisms.

Frame Relay is an effective data communication technology for data streams, which have a constant bit rate like for example digital language. For data communication with strongly changing traffic profile or also for Multimedia it is not particularly well suitable. Nevertheless it is used because of the small costs gladly for the connection by LANs over long-distance traffic distances. The error rate is then however in load situations clearly noticeable.

Frame Relay was developed, in order to make an efficient utilization possible of existing technical resources. The offerer can offer more transmission capacity to all customers in sum than it for the order stands, since most customers do not use always 100 per cent of their "“line"”. In some market segments Frame Relay got therefore a bad reputation - there some offerers in sum-clearly more range sold than for the order.

Frame Relay is replaced increasingly by AT and products, which are based on IP. Particularly virtual one private one of nets takes over increasingly as still the cheaper alternative the market segment of Frame Relay.

Format of the entities

Flag (1 byte)Address (2-4 byte)Utilizable data (variable)FCS (2 byte)Flag (1 byte)* The field address contains traffic parameters for the treatment of pilot situations (river control) apart from the connecting identification.

Articles in category "Frame Relay"

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Related Websites

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• Cisco - Configuring and Troubleshooting Frame Relay
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• MFA Forum
  MPLS and Frame Relay Alliance Updates. February 7, 2006 Fifteen Vendors to Demonstrate Interoperable Converged MPLS Services at MPLS World Congress ...


• What is Frame Relay - A Word Definition From the Webopedia ...
  This page describes the term Frame Relay and lists other pages on the Web where you can find additional information.