DATA COMMUNICATION - LAN TRAINERS

    1. LAN - TRAINER                                                                                                     [TOC]

           The LAN-Trainer is a versatile laboratory system that supplements courses on computer networks and LANs. The trainer exposes users to networking concepts at the physical, MAC, network and transport layers through a carefully designed series of experiments. The experiments reinforce the theory covered in lectures, while hands-on programming exercises train users to fit into networking positions in industry. The trainer can also be used for projects involving many layers of the network hierarchy. This trainer consists of a Network Emulator Unit (NEU) with PC plug-in Network Interface Units (NIU) and Win 95 based experiment software. The software contains a series of experiments in the form of stand-alone applications, 'C' source code for the experiments, and a 'C' library to access the NIU. The source code provides better understanding of the experiments, while the library allows users to program new experiments, modify existing experiments, and try out various network layers & protocols.

    2. DATA COMMUNICATION - LAN TRAINER                                                               [TOC]

            Vi Microsystem offers a powerful "Data Communication - LAN Trainer" based on 8075 / 8051 processor. It offers many types of hardware link like RS-232, RS-485, Optical Fibre etc for Data Communication. The software offers full flexibility for the students to understand various method of Data Communication and RS-485 based LAN networking. This is built around a 8085 microprocessor or 8051 micro-controller based board which consists of RS-232, RS-485, Fibre Optic, Analog Communication and parallel link for Data Communication and establishing a Local Area Networking experiments. The Data Communication software offer full flexibility for the student to understand the basics of Data Communications. The LAN software offers detailed information so that the basic of Local Area Networking. Software layer for implementing various protocol can be easily understood by the student. Various experiments are formed based on the hardware and software, which enable a students to write his own Device Drivers for any protocol, different types of Networking etc.Using the hardware (Data Communication Trainers) and the software, a IEEE 802.4 based (Token  Bus) Networking can be established and studied.

    Features of Data Communication Trainer

CPU

• 8085 Micro-processor or 8051 Micro-controller

MEMORY

• 32KB EPROM, 32K RAM

KEYBOARD, DISPLAY

• 101 IBM PC Keyboard, 16* 2 LCD Alphanumeric Display

SERIAL INTERFACE

• RS-232C

• RS-485

• Twisted pair

• Optical Fibre

• Transmission : Synchronous / Asynchronous mode

TIMER COUNTER

•  Used to generate Baud rates for Serial Communication

PARALLEL

•  8-bit Parallel port

CONNECTORS

• 50 pin FRC connector for CPU bus expansions

• 8-bit Parallel port on 26 pin FRC

• RS-232C - 9-pin D connector

• 9-pin D type RS-232 connection for OF link

• 2-pin for Twisted pair cable

• 9 pin ‘D’ for RS-485 link

3. FIBRE COMMUNICATION LINK :                                                                      [TOC]

  This communication link consist of a Transmitter model, a Receiver model and 2 meter plastic fibre of 1000 micro diameter. The link can operate upto 1.5 Mbits/ sec at a wave length of 820nm.

• Fibre Transmitter : 820nm

• Date Rate : 0-1.5Mbits / sec for NRZ

• Optic Power level : Controlled by a multiturn potentiometer

• Fibre Receiver : Pin photodiodeReceiver

• Gain Control : Adjustable by a multi-turn  potentiometer

• Optical Cable : 2M length, 1000 micron plastic fibre cable

• DAT DW : TTL Compatible

• Connector : 9 pin ‘D’ Connector

4. RS-485 COMMUNICATION LINK :                                                                     [TOC]

This communication link consists of RS-485 driver for 8251 terminated at 9-pin ‘D’ Connector for easy networking by students. This can be used for RS-485 communication for long distance. It can also be used for common channel bus based networking. An IBM Pentium computer can be used as "Network Master" and Data Communication - LAN Trainer can be used as nodes. The RS-485 bus is the common bus like Ethernet, Arcnet. The powerful software written in VC++ and Visual Basic will introduce the students to various networking techniques.

FEATURES :

The network Master is provided with powerful software to do the followings.

• Interacts with the each node / User and derives information on the number of nodes and its corresponding address in the network.

• Checks for connectivity and sets up the Logical Ring, which converts the interconnection of nodes into a powerful LAN.

• The Network Master Monitors the LAN contin-uously and views the channel Activity.

• Handles both the addition and deletion of a node without disturbing the rest of the LAN.

• All the nodes are based on "Data Communication Trainer" to establish a industry recognized LAN standard - IEEE 802.4 Token Bus.

• RS-485 based common bus is widely used in Process Automation.

In Local Area Networking mode, each node (8051 based system) will be configured as "Boot Strap Mode". This means the node will first "On Reset" will load the user program from the "Network Master" . This user program can be a developed LAN program or the students program for his Network configuration / new LAN software implementation. Hence a versatile LAN can be customized by the students.

The following experiments can be conducted using this Data Communication - LAN Trainer.

1. To study the protocols of

• Stop-and-wait Protocol

• Go-to-back-N Protocol

• Selective-Retransmission

2. PC-to-PC Communication with the Data Communication Trainers

• File Transfer.

• Error detection codes

• Data Encryption etc.

3. Experiments that can be performed on the LAN Trainer :

• Point-to-Point Communication

• Multicast/Broadcast Communication

• Networking Fundamentals

• Token bus - IEEE 802.4 Standard.

• Network Management / Token Management

• Data Encryption and security protocols.

5.ETHERNET INTERFACE TRAINER (ETHERNET BASED PRINTER SERVER)                   [TOC]

This trainer demonstrates to the students the basic of Ethernet interface and also how a printer can be interfaced to this trainer, so that it will work as Ethernet based printer server.

• Based on PIC16F877 Micro-controller.

• Provided with 2 PC/AT bus.

• Provided with one AT bus compatible LAN card to be connected to the LAN card of IBM Computer.

• One ISA bus compatible I/O card for printer port for the Dotmatrix printer to be connected.