Model 2237

Industrial Grade Audio Link using ST Fiber Optic Connectors

Connect microphones to stereo speaker systems through fiber
Provides lightning protection to remote site

Models 2237-T and 2237-R provide one-way stereo audio over a single fiber. Typical applications include paging systems, music distribution, and control with audio tones.

The 2237-T has 1/8" (3.5mm) microphone input and stereo line level phono jack inputs. The 2237-T digitizes the audio input into 16-bit samples at 48KHz rate. The microphone input is copied to both channels, the two line inputs remain in respective channels. The
digitized stereo audio is transmitted across a single fiber and received at the 2237-R. The 2237-R converts the digitized audio back to analog. The 2237-R has 1/8" headphone jack, line level phono jacks, and speaker phono jacks.

The 2237-T has volume adjustment to maximize the use of the digitized channel. The 2237-R has optical signal loss LED. Both the 2237-T and 2237-R have mute buttons.

Several 2237-R units can be connected to a single 2237-T with the use of a fiber splitter, S.I.Tech Model 9024.

Specifications

Audio Bandwidth:	10 Hz to 20 KHz
THD:	Better than 1%
MIC Input:	350mV rms max into 6K Ω
Line Input:	2V rms max into 10K Ω
Headphone Output:	1V rms max
Line Outputs:	0.9V rms into 10K Ω, 0.7V rms into 600 Ω
Speaker Outputs:	1W max into 8 Ω
Optical Power Budget:	10 dB
Operating Wavelength:	820 nanometers (1300nm optional)
Optical Interface:	ST (SMA optional)
Operating Temperature:	0 °C to 50 °C
Input Power:	110 VAC 50/60 Hz, Optional 230 VAC Optional 12-24 VDC
Metal Enclosure:	7.375" x 7.625" x 1.875" (18.7 x 19.4 x 4.8 cm)
Weight:	2lbs. (1 kg)

Operating Distance for Fiber Optic Cable

Optical unit connection: Connect the optical transmission line to the T and R receptacles. Note which cable channel goes to T or R by noting cable imprint. On the other end, reverse the connection.