Sec.  11.32   EAS Encoder.

   

   (a) EAS Encoders must at a minimum be capable of encoding the EAS
   protocol described in Sec. 11.31 and providing the EAS code transmission
   requirements described in Sec. 11.51. EAS encoders must additionally
   provide the following minimum specifications:

   (1) Encoder programming. Access to encoder programming shall be
   protected by a lock or other security measures and be configured so
   that authorized personnel can readily select and program the EAS
   Encoder with Originator, Event and Location codes for either manual or
   automatic operation.

   (2) Inputs. The encoder shall have two inputs, one for audio messages
   and one for data messages (RS-232C with standard protocol and 1200
   baud rate).

   (3) Outputs. The encoder shall have two outputs, one audio port and
   one data port (RS-232C with standard protocol and 1200 baud rate).

   (4) Calibration. EAS Encoders must provide a means to comply with the
   modulation levels required in Sec. 11.51(f).

   (5) Day-Hour-Minute and Identification Stamps. The encoder shall affix
   the JJJHHMM and LLLLLLLL codes automatically to all initial messages.

   (6) Program Data Retention. Program data and codes shall be retained
   even with the power removed.

   (7) Indicator. An aural or visible means that it activated when the
   Preamble is sent and deactivated at the End of Message code.

   (8) Spurious Response. All frequency components outside 200 to 4000 Hz
   shall be attenuated by 40 dB or more with respect to the output levels
   of the mark or space frequencies.

   (9) Attention Signal generator. The encoder must provide an attention
   signal that complies with the following:

   (i) Tone Frequencies. The audio tones shall have fundamental
   frequencies of 853 and 960 Hz and not vary over ±0.5 Hz.

   (ii) Harmonic Distortion. The total harmonic distortion of each of the
   audio tones may not exceed 5% at the encoder output terminals.

   (iii) Minimum Level of Output. The encoder shall have an output level
   capability of at least +8 dBm into a 600 Ohm load impedance at each
   audio tone. A means shall be provided to permit individual activation
   of the two tones for calibration of associated systems.

   (iv) Time Period for Transmission of Tones. The encoder shall have
   timing circuitry that automatically generates the two tones
   simultaneously for a time period of not less than 8 nor longer than 25
   seconds. NOTE: Prior to July 1, 1995, the Attention Signal must be at
   least 20 and not more than 25 seconds.

   (v) Inadvertent activation. The switch used for initiating the
   automatic generation of the simultaneous tones shall be protected to
   prevent accidental operation.

   (vi) Indicator Display. The encoder shall be provided with a visual
   and/or aural indicator which clearly shows that the Attention Signal
   is activated.

   (b) Operating Temperature and Humidity. Encoders shall have the
   ability to operate with the above specifications within an ambient
   temperature range of 0 to +50 degrees C and a range of relative
   humidity of up to 95%.

   (c) Primary Supply Voltage Variation. Encoders shall be capable of
   complying with the requirements of this section during a variation in
   primary supply voltage of 85 percent to 115 percent of its rated
   value.

   (d) Testing Encoder Units. Encoders not covered by Sec. 11.34(e) of this
   part shall be tested in a 10 V/m minimum RF field at an AM broadcast
   frequency and a 0.5 V/m minimum RF field at an FM or TV broadcast
   frequency to simulate actual working conditions.