VG-AnyLan (VG =Voice Grade) is a joint development of AT&T Microelectronics, Hewlett-Packard, and IBM and is standardized by the newly created IEEE. VG-AnyLAN is a star topology. The maximum amount of repeaters (HUBs) in one network is five. The maximum length of a complete network depends on the. Overview. VG-AnyLAN is a new network technology, defined by the IEEE standard, for transmitting Ethernet/IEEE and token ring/IEEE

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This presented a problem xny early installations that borrowed one unused twisted pair for telephone traffic but those installations were uncommon. Because the token stayed within the hub, it did not have to traverse long cables going to every node as in ARCNET and Token Ring therefore becoming faster than those other deterministic networking standards and being less susceptible to cabling problems, network card failures, and line interference.

What is transmission media? By using this site, you agree to the Terms of Use and Privacy Policy. Each HUB maintains a list of high- and normal-priority requests.

The top level HUB root is called level 1 and every step down adds a level.

This is called Link Training. The design goals were to avoid the radio frequency radiation emitted at the higher frequencies required by Fast Ethernet and to leverage existing wiring installations of Category 3 cabling that most organizations had recently installed to support 10 megabit twisted-pair Ethernet.

The reason for this is clock synchronization for the receiver circuitry, and it adds an easy way lah error checking. What is Parity Check? Type of bound transmission media Explain Unbound transmission ayn – What is Unbound transmission media.


One point worth noting is that the DPA protocol is transparent to the user of the network.

BaseVG – Wikipedia

Gateways — What is Gateway? The demand priority protocol has another advantage which is that it has two levels of priority for each user request. No one speaks out of turn, and by the end of the day, all business is complete.

The request has two 100vh priorities; normal 100vg high. This maximizes network efficiency, eliminates network collisions and token rotation delays. The high-priority is used for time critical applications. These drivers ship with the NICs, and are standardized. We also looked at applications where it can be used to meet a specific network’s requirements for high speed, including how ingegrate VG-AnyLAN with Ethernet swiching.

The maximum amount of repeaters ,an in one network is five. Nowadays, file servers and workstations built around high speed processors such as Intel’s Pentium chip are creating large amounts of network traffic. Features of the package level or network layer What is EtherTalk? Broadband versus Baseband What is Ethernet? Since there are only 16 balanced symbols available, 16 data paterns require two 6 bit symbols.

DPA also has a provision for High Priority traffic. Each node station or HUB may ask to send a packet to zny network. Thus, the IEEE Where he writes how-to guides around Computer fundamentalcomputer software, Computer programming, and web apps.

What is Bit Error?

It removed the token passing responsibility from the wiring and network nodes and placed it internal to the VG-AnyLAN 100vb. Unsourced material may be challenged and removed.

Although it is completely different from Ethernet and Token Ring access protocols, the details are all taken care of in the software drivers that the customer loads on workstations and servers.


Note that at any level, a hub can be connected either to workstations or one or more other hubs. What is the difference between computer networks and network communications?

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Since this is a matter of applications the packet info for high- or normal-priority is already in the packets that the MAC-layer receives. Tunneling — What is Tunneling? This scheme may seem to be cumbersome and inefficient, but it is not.

Hubs may be cascaded up to three 3 deep. This network topology is very useful in cases where individual users don’t require a lot of bandwidth, but segmenting the network is needed to prevent a large number of users from causing congestion. Instead of following the Fast Ethernet standard for twisted pair cabling by using only 2 pairs of wires, VG-AnyLAN used all four pairs in either Category 3 or Category 5 twisted pair cable.

The user of the network never even knows that it is happening, and doesn’t have to do any special setup to make it work.

VG-AnyLAN MIB (vgmib) –

Except when there is so much high-priority data that needs to be transported that it would be impossible for a normal-priority packet to get on the network. After saying what happened, and answering any questions, the discussion can return to farm subsidies.

With Category 5 cable, it is rated at a distance of feet. Dinesh authors the hugely popular Computer Notes blog.