VERSITRON'S new RS-485 fiber optic modem is the epitome of versatility. You can use it as a telephone modem, use it as a data modem, or use it as both. The F270X/F271X is capable of transmitting both voice and data signals simultaneously over one fiber optic cable. The data portions provide an RS-485/RS-422 interface at speeds up to 100kbts per second in asynchronous or isochronous modes. The voice portion provides a regular analog telephone interface. Both multi-mode and singlemode versions are available. In addition to simultaneous telephone and data transmission, this product also can be used as a copper link by utilizing the RJ11 4-wire interface. For end-users who require a compact device which can convert both data and voice to fiber, these VERSITRON modems are the answer.
Functional Characteristics:
The Model F271X products are f.o. modems used as an interface extender from a single-line subscriber telephone. These units are designed to be used with Model F270X Modems that provide an interface to the exchange or central office, or a pair of F271X can be used in a ring down or intercom application. These modems are designed to transmit audio (telephone) and/or data together on duplex f.o. cable or 4-wire twisted pair cable, depending the the application. The main characteristics of Model F271X modems are:
1) Multiplexes data (RS-485 or RS-422) and analog (Telephone audio signal), if desired
2) Transmits multiplexed data/audio signal on f.o. or copper interface cables
3) Offers ring down or intercom applications when using a pair of F271X subscriber modems
Model F270X and F271X Modem pairs use multimode f.o. cable of up to 2 km (6,560 ft/1.2 mi) for 850nm LED optics, up to 8 km (26,240 ft/5 mi) for 1300nm LED optics, or singlemode f.o. cable of up to 14 km (46,200 ft/8.7 mi) for 1300nm ELED optics. If a copper interface is used then up to 1 km (3,300 ft/.625 mi) 4-wire twisted pair cable may be used to complete the circuit between the exchange (F270X) and subscriber (F271X) side modems, or a pair of subscriber (F271X) modems.
Audio and Data Transmission Characteristics:
The F271X series operates by accepting the audio signal at the RJ11 connector from the subscriber telephone and digitizing it, using an A/D converter. This signal is then multiplexed with data signals coming from the RJ45. The combined signal is applied to a light pulse and transmitted over f.o. or 4-wire twisted pair copper cable to the remote F270X or F271X series unit.
The remote F270X or F271X series unit converts the light pulse (in cases of f.o. network connection) back into an electrical signal, demultiplexes the combined data/audio signal and applies the digitized signal to an A/D converter to recover the audio signal. The separated data and audio signals are then sent to their respective destinations. The outgoing signal path (exchange-to-subscriber or subscriber-to-subscriber) is similar. The audio signal is digitized and multiplexed together along with the data signals and transmitted to the F271X series unit. Finally, the F271X modem recovers the audio and data signals.
Give us a call at 1-800-537-2296 or 302-894-0699 with any questions you may have. We also will be glad to provide configuration diagrams if you should need them at no cost to you. Let us put our 50 years of experience to work for you.
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