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Specifications
Table 2 lists the specifications for the Multiple Digital Messaging Unit.
Figure 9 on the next page give the Aux. Connector pin-out definitions.
Table 2 Multiple Digital Messaging Unit Specifications.
Power Supply
Dimensions and
Weight
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Fuse Ratings
Temperature
Range:
Humidity Range:
Altitude:
Environmental
Battery Backup
Frequency
Response
Output Level
Input Impedance
Voice Encoding
Interconnect
Cable
115 VAC, 60 Hz, or 220 VAC, 50 Hz (specified on MDMU rear panel).
Height: 1.75 inches (4.4 cm).
Width: 16.25 inches (41cm) without brackets, 19 inches (48.3 cm) with brackets attached.
Depth: 9.25 inches (23.5 cm).
Weight: 13 pounds (6 kg).
AC Power: MDL 0.25 amp Slow Blo.
Battery: MDL 2.0 amp Slow Blo.
0 to +40 deg. C. (32 to 104 deg. F.) operational.
–40 to +66 deg. C. (–40 to +150 deg. F.) storage and shipment.
5% to 95% (non-condensing) storage/shipment and operation.
Sea level to 10,000 ft. operational (1048 to 648 millibars) 40,000 ft. max. shipment.
Locate in an area free of excess moisture, corrosive gases, dust, and chemicals.
Allows up to two hours of operation during a power failure. Total charge time 48 hours.
– 200 Hz to 3.4 kHz ( +3 dB).
Adjustable to a maximum of –9 dBm.
Handset: 220 ohm; Microphone: 600 ohms; Tape: 10K ohms.
8 KHz sampling rate, 8 bits/sample (PCM).
50 pin, RJ-21 connector providing contact closure message starts.
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