Difference between revisions of "Anderson Jacobson AD 342"
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| model = AD 342 | | model = AD 342 | ||
| intro_year = 1975 | | intro_year = 1975 | ||
| − | | intro_month = | + | | intro_month = May |
| intro_price = | | intro_price = | ||
| intro_prior = | | intro_prior = | ||
| − | | interface = | + | | interface = RS-232-C |
| − | | baud_rates = | + | | interface2 = 20 mA current loop |
| + | | baud_rates = 110, 300 | ||
}} | }} | ||
| − | The {{ | + | The '''AD 342''' was an acoustic data access coupler manufactured by |
| + | Anderson Jacobson. It was described as an origin/answer acoustic | ||
| + | coupler and supported both originate and answer operation over the | ||
| + | public switched telephone network. | ||
| + | {{Computerworld | ||
| + | | name=CW19750514AJ | ||
| + | | id=CdkopCC9Q0QC | ||
| + | | pg=54 | ||
| + | | title=Six AJ Devices make Debut | ||
| + | | date=May 14, 1975 | ||
| + | }} | ||
| + | |||
| + | An operating manual dated 1974 identifies the device as the | ||
| + | "AD342 Origin/Answer Acoustic Data Access Coupler" and documents its | ||
| + | installation, controls, and interfaces.<ref name=AJManual1974> | ||
| + | {{cite web | ||
| + | | url=https://bitsavers.org/communications/andersonJacobson/A242_AD342_Acoustic_Couplers_Operating_Manual_1974.pdf | ||
| + | | title=A242 AD342 Acoustic Couplers Operating Manual | ||
| + | | publisher=Anderson Jacobson | ||
| + | | date=1974 | ||
| + | | accessdate=28 February 2026 | ||
| + | }} | ||
| + | </ref> | ||
| + | |||
| + | The AD 342 was advertised in the July 23, 1975 issue of | ||
| + | ''Computerworld'', where it was depicted and identified by model | ||
| + | number. | ||
| + | {{Computerworld | ||
| + | | name=CW19750723AJAd | ||
| id=8pMVcgpPyVMC | | id=8pMVcgpPyVMC | ||
| page=19 | | page=19 | ||
| Line 15: | Line 44: | ||
| date=July 23, 1975 | | date=July 23, 1975 | ||
}} | }} | ||
| + | |||
| + | == Description == | ||
| + | |||
| + | According to the 1974 operating manual, the AD 342 was an acoustic | ||
| + | coupler designed to interface data terminal equipment to a standard | ||
| + | telephone handset. It supported originate, answer, and local test | ||
| + | modes, and provided both EIA (RS-232-C compatible) and 20 mA current | ||
| + | loop interfaces for connection to data terminal equipment. The unit | ||
| + | included front-panel controls for power and mode selection, together | ||
| + | with status indicators including carrier detect. Acoustic coupling | ||
| + | was accomplished using handset cups, and the manual also documents | ||
| + | provision for operation with a direct-connect Data Access Arrangement | ||
| + | (DAA). The AD 342 operated at data rates of 110 and 300 bits per | ||
| + | second, consistent with Bell 103 signaling practice.<ref | ||
| + | name=AJManual1974 /> | ||
| + | |||
| + | == History == | ||
| + | |||
| + | The AD 342 was publicly introduced in May 1975 as part of a group of | ||
| + | six new Anderson Jacobson devices.<ref name=CW19750514AJ /> | ||
{{references}} | {{references}} | ||
| Line 20: | Line 69: | ||
[[Category:Anderson Jacobson|AD 342]] | [[Category:Anderson Jacobson|AD 342]] | ||
[[Category:Modem]] | [[Category:Modem]] | ||
| + | [[Category:Acoustic Coupler]] | ||
[[Category:1975]] | [[Category:1975]] | ||
| − | |||
Latest revision as of 06:45, 1 March 2026
| Anderson Jacobson AD 342 | |
|---|---|
| Manufacturer | Anderson Jacobson |
| Model | AD 342 |
| Lifetime | |
| Introduced | May, 1975 |
| Communication | |
| Interfaces |
RS-232-C, 20 mA current loop |
| Baud Rates | 110, 300 |
The AD 342 was an acoustic data access coupler manufactured by Anderson Jacobson. It was described as an origin/answer acoustic coupler and supported both originate and answer operation over the public switched telephone network. [1]
An operating manual dated 1974 identifies the device as the "AD342 Origin/Answer Acoustic Data Access Coupler" and documents its installation, controls, and interfaces.[2]
The AD 342 was advertised in the July 23, 1975 issue of Computerworld, where it was depicted and identified by model number. [3]
Description
According to the 1974 operating manual, the AD 342 was an acoustic coupler designed to interface data terminal equipment to a standard telephone handset. It supported originate, answer, and local test modes, and provided both EIA (RS-232-C compatible) and 20 mA current loop interfaces for connection to data terminal equipment. The unit included front-panel controls for power and mode selection, together with status indicators including carrier detect. Acoustic coupling was accomplished using handset cups, and the manual also documents provision for operation with a direct-connect Data Access Arrangement (DAA). The AD 342 operated at data rates of 110 and 300 bits per second, consistent with Bell 103 signaling practice.[2]
History
The AD 342 was publicly introduced in May 1975 as part of a group of six new Anderson Jacobson devices.[1]
References
- ↑ 1.0 1.1 Six AJ Devices make Debut, Computerworld, May 14, 1975, pg. 54
- ↑ 2.0 2.1 "A242 AD342 Acoustic Couplers Operating Manual". Anderson Jacobson. 1974. https://bitsavers.org/communications/andersonJacobson/A242_AD342_Acoustic_Couplers_Operating_Manual_1974.pdf. Retrieved 28 February 2026.
- ↑ Anderson Jacobson advertisement, Computerworld, July 23, 1975, pg. 19
