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What is 100BASE-VG?
100BASE-VG is a high-speed Ethernet standard that refers to a specific type of Fast Ethernet. It stands for “100 Megabits per second Broadband Voice-Grade” and is sometimes also referred to as “100BASE-VG-AnyLAN.”
The Basics of 100BASE-VG:
100BASE-VG was introduced in the early 1990s as an alternative to traditional Ethernet technologies. It was specifically designed to support high-speed data transmission, as well as voice and video applications, over existing voice-grade wiring found in many buildings and offices.
Unlike other Fast Ethernet technologies, which generally use two pairs of differential signaling wires, 100BASE-VG takes a unique approach. It utilizes all four pairs of wires found in Category 3 or better twisted-pair cabling, or two pairs of wires in Category 2 cabling. This enables transmission speeds of 100 megabits per second (Mbps) in both directions simultaneously.
Additionally, 100BASE-VG incorporates a hybrid coding scheme called “51B8B,” which combines a 2B1Q (Two Binary, 1 Quinary) symbol coding for data transmission with a 5-level cursor coding for voice transmission. This hybrid scheme allows for both data and voice signals to coexist on the same wiring infrastructure.
The Advantages and Applications of 100BASE-VG:
100BASE-VG offers several advantages compared to other Ethernet standards. Firstly, it can operate over existing voice-grade wiring, eliminating the need for costly cable replacements. This makes it a cost-effective solution for network upgrades or installations in older buildings.
Furthermore, 100BASE-VG’s support for voice and video applications makes it a versatile choice for businesses that require multimedia transmission capabilities. Its ability to transmit voice signals simultaneously with data allows for the integration of telephony systems into the local area network (LAN) infrastructure.
Some common applications of 100BASE-VG include:
1. Office Networks: 100BASE-VG is ideal for LAN deployments in office environments, where it can support the simultaneous transmission of data and voice signals over existing wiring.
2. Multimedia Streaming: Its high-speed capabilities make 100BASE-VG suitable for streaming multimedia content, such as video conferences or multimedia presentations.
3. Legacy System Integration: In situations where older voice-grade cabling is in place, 100BASE-VG allows for the integration of legacy systems into modern network infrastructures without the need for extensive rewiring.
In conclusion, 100BASE-VG is a high-speed Ethernet standard that provides a cost-effective solution for high-speed data transmission, voice, and video applications. Its ability to utilize existing voice-grade wiring makes it a practical choice for network upgrades and installations in older buildings. Additionally, its support for multimedia transmission makes it a versatile option for businesses with diverse communication needs.
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