The National Institute of Standards and Technology (NIST) broadcasts a time and frequency standard on Station WWVB from Fort Collins, Colorado. WWVB transmits60-kHz carrier frequency derived from the National atomic time standard. Time code is added to the broadcast by reducing carrier power 10 dB once-per-second for fixed intervals of time. The WWVB code contains information on the current year, day-of- year, and time reflecting Coordinated Universal Time (UTC). Indicators warning of Daylight Saving Time, leap second, and leap year are also encoded into the WWVB transmission. A complete description of WWVB is found in Appendix A of this manual. The Spectracom NetClock/2, shown in Figure 1-1, receives and demodulates the WWVB signal. Once the signal is decoded, the NetClock/2 automatically sets and provides accurate and traceable time data outputs. The outputs may be used to synchronize computer networks, dispatch consoles, voice loggers and event loggers. FEATURES The Spectracom Model 8182 NetClock/2 offers the following features: NENA Compliant: The Model 8182 conforms to the National Emergency Number Association, NENA 04-002 PSAP Master Clock Standard. Traceability: Received WWVB broadcast provides direct traceability to the National Institute of Standards and Technology. Automatic Operation: Automatically decodes and synchronizes to the WWVB time code and adjusts for Daylight Saving Time, Leap Year, and Leap Second corrections. Timing Outputs: The NetClock/2 timing outputs are used to synchronize voice recorders, ANI/ALI, consoles, CADs and other devices found in the Dispatch Center. Each NetClock/2 includes an RS-232 interrogation port, RS-232 and RS-485 broadcast port, and both amplitude modulated and pulse width coded IRIG outputs.