A-A-52317A
2.4.3 Cellular link monitoring. The CATD shall monitor its communication status and, on determination of loss of contact with its cell site or other loss of communications capability, shall provide a relay output, distinct from the line fault output (see 2.4.2), indicating loss of cellular link.
2.4.4 Periodic self test. The CATD shall provide a periodic self test at selectable weekly or monthly intervals. To perform this test, the CATD shall provide a relay output to trip an input to the DCC and transmit a test report over the cellular link to the phone number(s) dialed (see 2.3.12) by the DCC. This relay shall be dedicated only for the periodic self test and any manually initiated self test and shall be distinct from the line fault (see 2.4.2) and cellular link loss (see 2.4.3) relays. Not more than 2 minutes after completion of a self-test, the CATD shall switch back to communication via the telephone link.
2.4.5 Operating power. The CATD shall operate from nominal 115 volts, 60 Hz alternating current wired directly to the CATD or from the output of an external transformer which plugs into a nominal 115 volts ac outlet. The CATD shall perform its normal functions when energized by voltages from 85 to 110 percent of the nominal voltage.
2.4.6 Standby power. The CATD shall maintain on float or trickle charge an internal rechargeable, lead acid battery, or batteries, which shall, upon failure of the ac power, automatically provide operating power for the CATD for at least 8 hours, assuming at least fifteen minutes of cellular transmissions. The CATD shall provide a relay output that changes state to indicate loss of ac power. The change in this output shall not occur if ac power is lost for less than one minute but shall occur after not more than 4 hours without ac power, except as follows: the time may be as much as 8 hours if the calculated battery capacity remaining when the change of state occurs is sufficient to allow battery operation for at least 4 more hours, followed by at least 5 transmission attempts at maximum (3 watts) output power. The CATD shall check battery condition at least once daily and shall provide a relay output to indicate low battery if the capacity has dropped to a level that would render the battery unable to perform its function. The same relay may be used to indicate loss of ac power, low or missing battery, and loss of cellular link and other CATD problems, but must be different from the relays indicating telephone line fault (see 2.4.2) and self test (see 2.4.3).
2.4.7 Output power. The CATD shall be able to deliver up to 3 watts output power to a standard 5/8 wave, 14.5 inch mast length, cellular antenna with minimum of 10 feet of coaxial cable.
2.4.8 Dialing attempt monitoring. The CATD shall employ a method of determining unsuccessful DCC dialing attempts and shall switch to cellular transmission if the DCC does not successfully contact the monitor station after a predetermined pattern of dialing attempts which indicates failure of the DCC to successfully transmit its report. Provision shall be made for the user to disable this option.
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