Abstract: Information including images of the parent and child are stored in an integrated circuit device in a child's watch or bracelet. The device contains write only once, non-volatile, storage and contacts for coupling the device to data entry and reader stations. At the time of entry into a protected facility, information identifying the child and guardian, along with digitized photos of the child and the guardian, are stored in the non-volatile storage at an entry station. Once the identification information is written into the device at the entry station, the child's watch or bracelet is attached with a tamper proof seal to the child in such a way that it cannot be easily removed by the child. If, while in the protected premises, the child is lost, found and taken to a security station, the watch is removed from the child and placed in the reader at that station and the information retrieved.

Abstract: A wavelength division multiplexer (WDM) unit (12) includes a plurality of Input/Output cards (IOCs 14). Each IOC is bidirectionally coupled to I/O specific media (fiber or copper) and to two coaxial cables. Also bidirectionally coupled to the coaxial cables are a plurality of Laser/Receiver Cards (LRC 20). The interface between the IOCs and the LRCs is an Emitter Coupled Logic (ECL) electrical interface that is conveyed over the coaxial cables. Each LRC is bidirectionally coupled by two single mode fibers to an optical multiplexer and demultiplexer, embodied within a grating (24). An input/output port of the grating is coupled to a fiber link (28) that enables bidirectional, full duplex data communications with a second WDM. Each WDM also includes a Diagnostic Processor Card (DPC 28) that receives status signals from the IOCs and LRCs, that forwards the status signals on to an external processor, and which generates control information for the IOCs and LRCs.