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100VG AnyLAN |
100VG AnyLAN was developed by Hewlett Packard along with others to be the standard for Fast Ethernet. The IEEE gave that title to 100BASE T and 100VG AnyLAN wound up getting its own standard of 802.12. It is not Ethernet but it is compatible with either 802.3 Ethernet or 802.5 Token Ring (depending on the manufacturer). 100VG AnyLAN relies on the hub to control network access. The hub uses Token Passing, a method where each station receives and passesthe right to use the single shared channel on the LAN. All stations areguaranteed access to the network at regular consistent intervals. Thisprovides support for time sensitive applications like voice, video andmultimedia. While Ethernet uses a CSMA/CD access scheme (see theIntro to Ethernet section for more details) 100VG AnyLAN uses a Demand Priority access scheme. Demand Priority allows one or more stations to send high priority transmissions first. If the hub receives a high priority request, it completes its current transmission and then immediately grants access to the high priority request. When all high priority requests are dealt with, normal operation resumes. Preventing time outs is simple: the hub grants temporary high priority status to normal priority requests. This creates a collision free network and is designed for higher throughput. However, 100 BaseT may be a better choice, depending on your needs. Cabling on 100VG AnyLAN
depends on your needs. 4 pair Category |
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