LAN-T trainer

The LAN-T trainer is useful for study and development of reliable data transfer protocols, networking layers and applications.


  • Comprehensive set of experiments to observe and measure the behaviour of several LAN protocols: MAC layer, Data link layers and connection management
  • User configurable data rates - 8kbps, 16, 32, 64, 128, 256, 512 and 1Mbps
  • Generation of bit errors and Frame errors between nodes - up to 10-6
  • Variable Network size - up to six nodes with each NEU. NEUs can be cascaded to increase the network size
  • Emulation of two nodes by each PC. Halves the number of PCs required
  • User configurable delays between nodes - emulates the propagation delay in real networks
  • Allows experimentation using the software provided; source code included for better understanding
  • Allows programming of all experiments from scratch using the library, for more in-depth exposure
  • Menu driven user interface to experiments
  • Comprehensive manual suitable for both lab instruction as well as self-study


The Trainer exposes users to networking concepts at the physical, MAC network and transport layers, through a series of designed experiments. The experiments reinforce the theory covered in lectures, while the 'hands-on' programming exercises train students to industry level. The trainer can also be used for project work involving many layers of the network hierarchy. The NEU hardware emulates six nodes (two nodes per PC), which can be configured to Bus, Star or Ring topologies. It has error generators and delay generators between nodes. Each NIU card emulates two independent nodes supporting various MAC layers on a single PC. The system scales up to emulate larger networks by adding more NEUs, NIUs and PCs.

Curriculum Coverage

Experiment Level 1
  • Observation and measurement of behaviour of various network protocols. Step-by-step instructions given in manual under the ''Trying it out'' section.
  • Packet transmission on a point-to-point link
  • Measure throughput for the following MAC Layer protocols by varying the offered load - changing IPD, packet length, data transmission rate, bit delay, introducing bit errors, frame errors, Token Holding Time (THT) depending on protocol:
  • Token Bus
  • Token Ring
  • Measure of throughput and the effect of bit errors for the following DLL protocols (also called as Reliable
  • Transfer Protocols) - varying the timeout period, introducing bit errors and frame errors:
  • Stop-and-Wait
  • Sliding Window - Go-back-N Experiment Level 1 continued Other possible topics of interest that can be implemented by users are:
  • Star topology - throughput measurement
  • Connection management - 2-way handshake
  • Sliding window - Jumping window

    Experiment Level 2

    Implement and test various protocols on one node by writing code while the experiment software is run on the other nodes. The program development is explained in detail in the manual. Data structures, FSM, Pseudo-code, wherever necessary, are provided. Exercises are given at the end of each topic.

    Experiment Level 3:(Projects demonstrating realworld principles)
  • Projects involving several layers of network software, including application layers, are possible to implement with LAN-T. Users may be required to workout and implement the detailed specification.
  • File Transfer Programme (FTP) bundled with the experiment software
  • Routing in a mesh WAN
  • Network management
  • Remote procedure calls
  • Talk program
  • Distributed database
  • A sample Web
  • Additional pictures


    LAN-T -Trainer

    Instruments Techno Test inc.

    Instruments Techno Test inc.
    2345, Michelin street, #100
    Laval, Qc
    H7L 5B9

    Téléphone : (450) 681-5777
    Télécopieur : (450) 681-3773

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