Frame relay
 

Frame relay is a telecommunication service designed for cost-efficient data transmission for intermittent traffic between local area networks (LANs) and between end-points in a wide area network (WAN). Frame relay puts data in a variable-size unit called a frame and leaves any necessary error correction (retransmission of data) up to the end-points, which speeds up overall data transmission. For most services, the network provides a permanent virtual circuit (PVC), which means that the customer sees a continous, dedicated connection without having to pay for a full-time leased line, while the service provider figures out the route each frame travels to its destination and can charge based on usage. An enterprise can select a level of service quality prioritizing some frames and making others less important. Frame relay is offered by a number of service providers, including AT&T. Frame relay is provided on fractional T-1 or full T-carrier system carriers. Frame relay complements and provides a mid-range service between ISDN, which offers bandwidth at 128 Kbps, and Asynchronous Transfer Mode (ATM), which operates in somewhat similar fashion to frame relay but at speeds from 155.520 Mbps or 622.080 Mbps.

Frame relay is based on the older X.25 packet-switching technology which was designed for transmitting analog data such as voice conversations. Unlike X.25 which was designed for analog signals, frame relay is a fast packet technology, which means that the protocol does not attempt to correct errors. When an error is detected in a frame , it is simply "dropped." (Thrown away). The end points are responsible for detecting and retransmitting dropped frames. (However, the incidence of error in digital networks is extraordinarily small relative to analog networks.)

Frame relay is often used to connect local area networks with major backbones as well as on public wide area networks and also in private network environments with leased lines over T-1 lines. It requires a dedicated connection during the transmission period. It's not ideally suited for voice or video transmission, which requires a steady flow of transmissions. However, under certain circumstances, it is used for voice and video transmission.

Frame relay relays packets at the Data Link layer of the Open Systems Interconnection (OSI) model rather than at the Network layer. A frame can incorporate packets from different protocols such as Ethernet and X.25. It is variable in size and can be as large as a thousand bytes or more.

I think I just got hit in the face with a chunk of spam. Which is not nearly as much fun as one might think.

I took the links out, the rest is reference information to keep tw entertained. ;)

That's what SHE said.

Frame relay is obsolete technology - made grossly useless and too expensive by the Internet. And yes, I know companies that are still using it. So what was she selling?

Chinese IT services.

Chinese IT services? Did China even have phones back when Frame Relay was being installed?

I thought newbies had to make a few legit posts before they could start threads?

Sheesh, a chinese spammer gets more responses than I do!

Just kiddin'

I kid!

tw,

Frame Relay is obsolete because of MPLS, not the Internet :).

It's a heck of a lot easier to have the carrier provision an MPLS VPN solution using packet tagging than it is to provision circuits. One requires a few entries in an admin console, the other is an administrative nightmare. Both give the same result.

However, many companies don't realize this yet.

Only because we like you.

and don't know why

It was moderated. I edited it, and then approved it on a hunch some people would find it amusing/interesting.