Difference between revisions of "DNVT"
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↑ FM 3-04.120 ¶2-83.
↑ Kirsch 1981, p. 1609.
↑ FM 3-04.120 ¶2-84.
↑ Kirsch 1981, p. 1609.
↑ FM 3-04.120 ¶2-85.
↑ FM 3-04.120 ¶2-86.
↑ Kirsch 1981, p. 1609.
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| − | Digital Nonsecure Voice | + | The Digital Nonsecure Voice Terminal (DNVT) is a telephone set which transmits and receives conditioned diphase modulated data at a signaling rate of 16 or 32 kilobits per second (kbps) over a 4-wire interface.<ref>FM 3-04.120 ¶2-83.</ref> It is available in either desk set or field telephone models<ref>Kirsch 1981, p. 1609.</ref> Field models include: |
| − | |||
| − | |||
* [[TA-954/TT]] | * [[TA-954/TT]] | ||
* [[TA-1035/U]] | * [[TA-1035/U]] | ||
| − | * [[TA-1042A/U]] | + | * [[TA-1042A/U]] (with data connector for [[AN/UXC-7]] tactical facsimile machine, [[AN/UGC-144]] communications terminal, etc.)<ref>FM 3-04.120 ¶2-84.</ref> |
| + | |||
| + | |||
| + | Pairs of [[TA-1042A/U]] DNVTs may be used in local battery (LB) mode as simple field phones, without requiring connection to a telephone exchange. The [[TA-954/TT]], however, must always be connected to a telephone exchange as it does not support direct DNVT-to-DNVT connection. When connected to a telephone exchange and configured in common battery (CB) mode, the DNVT receives phantom power from the telephone exchange over the send/receive line pairs. <ref>Kirsch 1981, p. 1609.</ref> ''(TBD: Can the [[TA-1035/U]] be operated without connection to an exchange? Can either the [[TA-954/TT]] or [[TA-1035/U]] be powered in LB mode?)'' | ||
| + | |||
| + | |||
| + | The DNVT offers the following features:<ref>FM 3-04.120 ¶2-85.</ref> | ||
| + | |||
| + | * Digital telephone/data set for mobile subscriber equipment (MSE) and TRI-TAC systems. | ||
| + | * Full duplex voice or data communications. | ||
| + | * Push-to-talk (PTT) for combat radio net interface. | ||
| + | * Standard four-wire loop interface. | ||
| + | * Mean time between failures (MTBF): 150,000 hours. | ||
| + | * Automatic tracking of 16 or 32 kbps switch loop rate via autobaud feature. | ||
| + | |||
| + | |||
| + | The DNVT has the following specifications:<ref>FM 3-04.120 ¶2-86.</ref><ref>Kirsch 1981, p. 1609.</ref> | ||
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| + | * Data rates of 16 or 32 kbps synchronous or up to 2400 bits per second asynchronous. ''(TBD: Does this only apply to the [[TA-1042A/U]]?)'' | ||
| + | * Loop interface: four-wire line, up to 4km of [[WF-16/U]] field wire. | ||
| + | * Line impedance: 125Ω ±10% resistive. | ||
| + | * Operating voltage: 24 to 56 volts DC. | ||
| + | * Audio codec: [[Wikipedia:Continuously_variable_slope_delta_modulation|continuously variable slope delta modulation]]. | ||
| + | * Signal format: Conditioned diphase at 16 or 32 kbps. | ||
| + | * Codeword format: Cyclically permuted 8-bit words. | ||
| + | * Output level: 3V peak to peak. | ||
| + | * Input level: between 150 mV and 4V peak to peak. | ||
| − | |||
| − | + | == Related Files == | |
| − | + | ;{{pdf|TTC-39.pdf|TTC-39 TRI-TAC family brochure from GTE Sylvania}} | |
| − | |||
| + | == Notes == | ||
| − | + | {{Reflist}} | |
| − | |||
| + | == References == | ||
| + | * Kirsch, Alan L. ''et. al.'' (November 1981). "The Digital Nonsecure Voice Terminal", ''IEEE Transactions on Communications'', Vol. COM-29, No. 11, pp. 1609-1614. ([http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=1094902 link]) | ||
| + | * Headquarters, Department of the Army (February 2007). "Air Traffic Services Operations", ''Field Manual FM 3-04.120 (FM 1-120)''. ([[media:FM3-04-120.pdf|link]]) | ||
[[Category:Military/Field Phones]] | [[Category:Military/Field Phones]] | ||
Revision as of 07:34, 28 May 2013
The Digital Nonsecure Voice Terminal (DNVT) is a telephone set which transmits and receives conditioned diphase modulated data at a signaling rate of 16 or 32 kilobits per second (kbps) over a 4-wire interface.[1] It is available in either desk set or field telephone models[2] Field models include:
- TA-954/TT
- TA-1035/U
- TA-1042A/U (with data connector for AN/UXC-7 tactical facsimile machine, AN/UGC-144 communications terminal, etc.)[3]
Pairs of TA-1042A/U DNVTs may be used in local battery (LB) mode as simple field phones, without requiring connection to a telephone exchange. The TA-954/TT, however, must always be connected to a telephone exchange as it does not support direct DNVT-to-DNVT connection. When connected to a telephone exchange and configured in common battery (CB) mode, the DNVT receives phantom power from the telephone exchange over the send/receive line pairs. [4] (TBD: Can the TA-1035/U be operated without connection to an exchange? Can either the TA-954/TT or TA-1035/U be powered in LB mode?)
The DNVT offers the following features:[5]
- Digital telephone/data set for mobile subscriber equipment (MSE) and TRI-TAC systems.
- Full duplex voice or data communications.
- Push-to-talk (PTT) for combat radio net interface.
- Standard four-wire loop interface.
- Mean time between failures (MTBF): 150,000 hours.
- Automatic tracking of 16 or 32 kbps switch loop rate via autobaud feature.
The DNVT has the following specifications:[6][7]
- Data rates of 16 or 32 kbps synchronous or up to 2400 bits per second asynchronous. (TBD: Does this only apply to the TA-1042A/U?)
- Loop interface: four-wire line, up to 4km of WF-16/U field wire.
- Line impedance: 125Ω ±10% resistive.
- Operating voltage: 24 to 56 volts DC.
- Audio codec: continuously variable slope delta modulation.
- Signal format: Conditioned diphase at 16 or 32 kbps.
- Codeword format: Cyclically permuted 8-bit words.
- Output level: 3V peak to peak.
- Input level: between 150 mV and 4V peak to peak.
Related Files
TTC-39 TRI-TAC family brochure from GTE Sylvania
Notes
References
- Kirsch, Alan L. et. al. (November 1981). "The Digital Nonsecure Voice Terminal", IEEE Transactions on Communications, Vol. COM-29, No. 11, pp. 1609-1614. (link)
- Headquarters, Department of the Army (February 2007). "Air Traffic Services Operations", Field Manual FM 3-04.120 (FM 1-120). (link)