SIMSCRIPT Solutions


SIMSCRIPT II.5: COMPUTER ARCHITECTURE and NETWORK ANALYSIS


Starlan Network Simulation

Hewlett-Packard; Roseville, CA

The Starlan simulation enables system designers to monitor network traffic based on a set of changeable network parameters. A file is transferred, in packets, from each node to a hard disk. The animation shows which node is accessing the network and the remaining file portion for each node. The destination hard disk is not shown. The model ends when all files have been transferred.

Fourteen parameters are available for modification. They are:

  • Disk Count: number of hard disks receiving files.
  • Disk Speed: Hard disk write speed.
  • Maximum Retries: the number of times a packet tries before transmission fails.
  • TCP Max: the maximum number of retry sets.
  • Display & Change TCP Mults: the delay time multipliers between sets of retries.
  • Inter Packet Delay: Time between acknowledgments of available network and transmit begin.
  • ISO Delay: delay between checking the status of network and transmission.
  • Clock Speed: Speed of the network.
  • Packet Size: Size of the packet in bytes.
  • ACK Pack Size: Size of the acknowledgment in bytes.
  • PRE Pack Size: Size of transmit file header.
  • POST Packet Size: Size of transmit file trailer.
  • File Size: size of the file to be transmitted.
  • Number of Nodes: nodes that will be transmitted files.

The Starlan simulation was developed at Hewlett-Packard's Roseville, California plant.

Benefits of SIMSCRIPT II.5: The Starlan Network Simulation was used by system engineers to decide if a new product would meet its specification requirements. Message throughput and occurrence of collisions were the most important requirements.