VSC7430XMT

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The VSC7430XMT is an integrated multi-function analogue transceiver chip from Vitesse Semiconductor. It is used to eliminate the need for external transceivers when building network routers and switches. This chip performs both physical and MAC (Media Access Control) functions, allowing for a single chip solution for systems that traditionally require multiple components.

The VSC7430XMT is designed for use in Fiber Distributed Data Interface (FDDI) and Gigabit media iserial protocol (GMS) systems. This chip couples fibre-optic communication links with systems operating on physical layer interfaces such as Ethernet, Fast Ethernet and Token Ring. Through its integration of FDDI and GMS standards, the VSC7430XMT enables interoperability and high speed communication between network devices.

The VSC7430XMT includes a number of features, some of which are listed below:

• 8KB of RAM for link management functions
• Serial EEPROM for programmable interface settings
• Medium independence and protocol translation capability
• 512K bits of memory for packet buffering
• Complies with the ITU-T X.21, V.11, V.35 and EIA530 standards

The physical layer functions include framing, termination, auto-negotiation, line coding and data rate control. The chip supports multiple physical layers, including Manchester-encoded synchronous signalling, EIA-530, RS-485 and MII (media independent interface). The medium independence and protocol translation capabilities enable it to support both synchronous and asynchronous communication.

The MAC layer functions include frame encoding and decoding, Ethernet header generation and source address filtering. The chip also includes a 8KB RAM for link management functions, 512K bits of memory for packet buffering and a serial EEPROM for programmable interface settings. The VSC7430XMT complies with the ITU-T X.21, V.11, V.35 and EIA530 standards.

The VSC7430XMT supports a variety of applications, including:

• Asynchronous and synchronous transmission rate adaptation for Ethernet switches
• Communication over multi-mode, single-mode and single-hub fibres
• High speed WAN (wide area network) connections
• Ethernet and Token Ring connectivity
• Full duplex communication over twisted pair and coaxial cables
• 100base-T, FDDI and SONET/SDH grade fibre-optic communication

The working principle of the VSC7430XMT is based on a number of layers of protocol processing. The chip has a serial EEPROM for storage of programmable interface settings, an 8KB RAM for link management functions and a 512K bits of memory for packet buffering. The chip performs physical layer functions such as framing, termination and line coding, as well as MAC layer functions including frame encoding and decoding, Ethernet header generation and source address filtering. The chip also supports medium independence and protocol translation, allowing it to bridge networks operating on different protocols.

The VSC7430XMT is a multi-purpose integrated transceiver chip for use in building network routers and switches. It supports a variety of applications, including asynchronous and synchronous transmission rate adaptation for Ethernet switches, high speed WAN connections and full-duplex communication over twisted pairs and coaxial cables. Furthermore, it supports a number of physical and MAC layer functions, enabling a single chip solution for networks that usually require multiple components.

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