Telephone Set TA-838A/TT is a ruggedized, digital processor controlled equipment operating with low battery power consumption and providing the following service operational modes:
- 2 Wire, DC Supervision, DTMF Signal, CB
- 2 Wire, DC Supervision, DTMF Signal, LB
- 4 Wire, DC Supervision, DTMF Signal, CB
- 4 Wire, DC Supervision, DTMF Signal, LB
- 4 Wire, AC Supervision, (2250 Hz Seize, 2600 Hz Release) DTMF Signal, LB
- 4 Wire, AC Supervision, (2250 Hz Seize, 2600 Hz Release) DTMF Signal, CB
- Point to Point, 570 HZ Ring Burst, LB
- Meets Requirements of U.S. Military Specification MIL-T-49110 (EL)
- 4 Wire or 2 Wire Local or Common Battery Mode selection for Operation with AN/TTC-25, AN/TTC-38 (V), AN/TTC-39 or SB-3614 Switching Centers
- Typical Operating Current of 300 ua On-Hook, 5 mA Ring and 1.8 mA Off-Hook Extends Useful Battery Life
- Input Response and Output Tone Signal Generation are Digital Computer Controlled for Accuracy and Reliability
- Voice and Signal Paths Have Internal Self-Checking Circuits
- Component and Circuit Design, 4 Layer PC Board and Shielding Reduce Noise Generation and Susceptibility
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Input/Output Impedance
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600 ohms Nominal
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Voice Frequency
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300 to 3500 Hz
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DTMF Signaling
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16 Key CCITT Standard
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Seize Signal
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2250 Hz, -7 to 2 dBm
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Release Signal
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2600 Hz, -7 to 2 dBm
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Point to Point Signal
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570 Hz, -7 to 2 dBm
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Seize Acknowledge and Ring Detection
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555 to 585 Hz, -24 dBm min.
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Audible Alarm
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900 to 3500 Hz, 77 dB re .0002 Dynes/sq cm min. at 3 feet (9.2 meters)
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Typical LB Current
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300 ua On-Hook 5 mA ring 1.8 mA Off-Hook
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Battery Requirement
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4.4 to 6.4 Volts (Four BA-42 or C Cells)
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Operating Temperature Range
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35°C to +66°C
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Applicable Environmental Specifications
(Temperature, Altitude, Leakage Bounce,
Shock Drop, Dust, Salt Fog, Fungus)
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MIL-STD-810 C
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EMI
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MIL-STD-461 A
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Overall Dimensions
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6 in. High X 10 in. Deep X 6 in. Wide (15cm) X (25cm) X (15cm)
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Weight
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6.5 lbs. (3.2 Kg)
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