A UL-listed protector for isdn interfaces can be purchased as a module that snaps into the ZoneGuardian multioutlet AC surge protector and as a 19-inch rack-mountable modular system called the ZoneBarrier. When snapped into the ZoneGuardian, the module provides total protection for workstations and isdn equipment. ZoneBarrier can protect up to 32 incoming isdn lines or any mix of 32 protection modules in one rack.
Atlantic Scientific Corp.
Melbourne, FL