Definition of 100VG-AnyLan in Network Encyclopedia.

What is 100VG-AnyLan?

100VG-AnyLan is an alternative to Fast Ethernet that provides 100-Mbps communications based on technology developed by Hewlett-Packard. 100VG-AnyLan is based on the 802.12 specifications of Project 802 developed by the IEEE. 100VG-AnyLan is informally named 100BaseVG.

100VG-AnyLan network
100VG-AnyLan network

How 100VG-AnyLan Work?

100VG-AnyLan networks are wired together in a star topology using unshielded twisted-pair (UTP) cabling, shielded twisted-pair (STP) cabling, or fiber-optic cabling with supporting 100-Mbps hubs or Ethernet switches. If UTP cabling is used, it can be category 3 cabling, category 4 cabling, or category 5 cabling – with category 5 (CAT5) cabling or enhanced category 5 cabling preferred. 100BaseVG uses all four pairs of wires in UTP cabling. When using UTP category 3 cabling, category 4 cabling, or STP cabling, the maximum length of a segment is 100 meters. With UTP category 5 cabling, the maximum length of a segment is 200 meters. When using multimode fiber-optic cabling, the maximum length is 2000 meters.

100VG-AnyLan differs from Fast Ethernet by not using the traditional Carrier Sense Multiple Access with Collision Detection (CSMA/CD) method for media access used in Ethernet and Fast Ethernet networks; instead, 100VG-AnyLan uses the demand priority method for media access, which eliminates the overhead of collisions. 100VG-AnyLan uses a special coding scheme called quartet signaling, which makes it possible to transmit data over all four pairs of wires in a UTP cable simultaneously. This means that special 100VG-AnyLan hubs are required to support demand priority media access. Otherwise, the frame format, topology, and other specifications of 100VG-AnyLan are the same as for Ethernet.


100VG-AnyLan is also being developed to support token ring networks.

External references

See also


Articles posted after being checked by editors.

Recent Posts

link to Root


Root is the base of a hierarchical file system. It can also be the UNIX superuser or the CERN Data Analysis Framework, and more. Just read the article.