83C92A

The 83C92A has the following features including The 83C92A is Compatible with ANSI/IEEE 802.3 and ISO 8802-3 Standards for Ethernet(10BASE5) and Thin Net (10BASE2);Meets or exceeds all data sheet specifications of the National Semiconductor DP8392A, DP8392B DP8392C and DP8392C-1;Squelch circuits on all signal inputs to eliminate nose;Contains all transceiver functions on one chip,except power and DC isolation. For a complete Module Solution, refer to the EMZA data sheet.Collision Test Generator, externally deselectable to work with any ANSI/IEEE 802.3 and ISO 8802-3 repeater.Detects and reports network collisions in both transmit and receive modes.

The 83C92A is an Ethernet and Thin Net (Cheapernet)Transceiver that provides a complete Local Area Network interface for a station, with or without a transceiver cable,see Figure 1.The 83C92A is compatible with ANSI/IEEE 802.3 and ISO 8802-3, and both meets or exceeds the specification of the National Semiconductor DP8392A and DP83928.The 83C92A is part of a chipset manufactured by SEEQ Technology to provide the basic components for a LAN interface board. The other components include the 8005 or SOC04A Advanced Ethernet Data Link Controller (AEDLC TMand the 8020 or 8023A  Manchester Code Converter (MCCrTM).The 83C92A Ethernet Transceiver connects the station equipment to an Ethernet or Thin Net (Cheapernet) COAX cable. The 83C92A provides the drive currentand wave shaping for the transmit signals. It supplies receive signal equalization, collision detection and squelch.When used in an Ethernet LAN ,the 83C92A Transceiver is mounted on the Ethernet COAX cable, and connects to the station equipment through a transceiver cable.  The 83C92A may be located up to 50 meters from the station equipment.

A collision causes a -2.0 volt average DC level on the center conductor of the network cable. This level passes through a 4-pole Bessel low-pass filter for averaging. The resulting signal is measured by a voltage comparator against the threshold voltage VCD of about-1.5 volts. A collision is indicated when the center conductor average level is more negative than the CDS level by the threshold VCD. The line driver is enabled within 900 ns of the onset of the collision, and the 10 MHz signal is sent to the station equipment.