Case History Notebook
Modem Bank Security System Challenge: A data service reseller was plagued by 'bandit' users driving up telephone access costs, and causing legitimate users to receive busy signals. The data service provider was unwilling to provide improved security to assist the reseller. Action: Designed a Call Discriminating System to be installed between the modem bank and data concentrator. The unit monitored each logon attempt, disconnected unauthorized callers, and logged the failed attempt to a printer. Result: The reseller recovered the $30,000 cost of the unit in three months of reduced telephone charges, and enjoyed equivalent monthly cost savings after that period. Quality of service to legitmate customers was also improved by freeing up otherwise busy lines.