The School Administrator, October 1998, p. 40

Alabama’s Hunstville City School District recently discovered that ISDN lines—usually used to connect schools to the Internet—were a reliable and cost-effective method to link video surveillance and alarm systems at 43 schools to a central monitoring station. Hunstville had initially sent the information via microwave transmitters, but these proved costly and unreliable in bad weather.

Since switching to ISDN lines, the district has seen its hardware costs decrease $700,000 and has even received rebates from its insurance company.