FOM-5A, 6A Asynchronous Fiber Optic Modems

Transcription

1 ORDERING FOM-5A/*/+ Asynchronous Sub-miniature Fiber Optic Modem FOM-6A/*/+/# Asynchronous Miniature Fiber Optic Modem * Specify: F for female 25-pin connector M for male 25-pin connector + Specify: ST for ST type optical connectors FC for FC type optical connectors SC for SC type optical connectors # Specify: W for metal enclosure (for FOM-6A only FOM-5A, 6A Asynchronous Fiber Optic Modems /02 Specifications are subject to change without prior notice RAD Data Communications Ltd.

2 FEATURES Asynchronous transmission up to 19.2 kbps Transmission range up to 3 km (2 miles), regardless of data rate Full or half duplex Transfers one control signal end-to-end DCE-DTE switch No external power required Plugs directly into V.24/RS-232-C terminal connector LED indicator for transmit data Compact, lightweight, easy to install APPLICATION A pair of FOM-5A or FOM-6A modems ensures secure data transmission over fiber optic cable at distances up to 3 km (2 miles). DESCRIPTION FOM-5A and FOM-6A, Asynchronous Fiber Optic Modems, are used for local data distribution connecting full or half duplex async computers and terminals. A pair of modems ensures integrity of data transmission over fiber optic cable at distances up to 3 km (2 miles). FOM-5A is a miniature version of FOM-6A. Both modems are fully compatible and offer the same features. FOM-5A is 78 mm (3.1 in) by 18 mm (0.7 in); FOM-6A is 110 mm (4.3 in) by 24 mm (0.9 in). FOM-5A and FOM-6A feature a switch-selectable DTE/DCE option. This allows operation as DTE, for connection to another DCE such as a multiplexer port, eliminating the need for a cross-cable. The carrier can be strapped for either continuous operation, or for switched operation controlled by the signal, for transfer of a control signal end-to-end. A LED indicator lights whenever data transmission takes place. Note: With FOM-6A in a metal case, the LED indicator is not available. The delay between Request to Send and Clear to Send can be set for 2 or 15 msec. Innovative circuitry allows FOM-5A and FOM-6A to operate without connection to the mains supply, by using ultra-low power from the data and control signals. Both modems are provided in a plastic enclosure. FOM-6A can optionally be supplied in a metal case to reduce radiated emission (see Ordering). FOM-5A and FOM-6A incorporate all the advantages of a fiber optic system, providing: Lower attenuation than with copper wire EMI/RFI immunity, saving the cost of expensive and heavy shielding, and complex error checking routines Almost absolute security and reduction in the cost of data encryption; eavesdropping is virtually impossible as negligible power is radiated from the fiber Safety and electrical isolation: no spark hazard and no ground-loop noise problems. Note: Attenuation is not related to frequency.

3 SPECIFICATIONS Data Rate Up to 19.2 kbps Pulse Width Distortion Less than 25% Transmission Line Duplex optical cable Transmission Mode Asynchronous, full or half duplex Transmission Controls Carrier constantly on or controlled by Optical Output Levels -28 dbm into 100/140 fiber -32 dbm into 62.5/125 fiber -36 dbm into 50/125 fiber Receiver Sensitivity -45 dbm Operating Wavelength 850 nm Operating Range Maximum range is 3 km (2 miles) over continuous fiber of the following types: 100/140 fiber with attenuation of 4 db/km 62.5/125 fiber with attenuation of 3.5 db/km 50/125 fiber with attenuation of 3 db/km Terminal Interface V.24/RS-232-C integral 25-pin, male or female connector (see Ordering) /CTS Delay 2 or 15 msec Fiber Optic Interface Optical connectors: Optional ST or FC types (see Ordering) Power For proper operation, the following digital interface connectors (DB-25) must be active: DCE mode: 2, 4 and 20 DTE mode: 3, 6 and 8 Typical power consumption drawn from these pins is 50 mw (at +6V signal level). Physical FOM-5A: Length: 78 mm / 3.1 in Width: 53 mm / 2.1 in Height: 18 mm / 0.7 in Weight 54g / 1.9 oz FOM-6A: Length: 110 mm / 4.3 in Width: 53 mm / 2.1 in Height: 24 mm / 0.9 in Weight: 82g / 2.9 oz Environment Temperature: 0 50 C / F Humidity: up to 90%, non-condensing Declaration of Conformity Mfr. Name:RAD Data Communications Ltd. Mfr. Address: 12 Hanechoshet St. Tel Aviv Israel declares that the product: Product Name: FOM-5A, FOM-6A Conforms to the following standard(s) or other normative document(s): EMC: EN (1987): Limits and methods of measurement of radio disturbance characteristics of information technology equipment. EN (1992): Electromagnetic compatibility - Generic immunity standards for residential, commercial and light industry. Supplementary Information: The product herewith complies with the requirements of the EMC Directive 89/336/EEC and the Low Voltage Directive 73/23/EEC. The product was tested in a typical configuration. Tel Aviv, December 28 th, 1995 Haim Karshen VP Quality European Contact: RAD Data Communications GmbH, Otto-Hahn-Str , Ottobrunn-Riemerling, Germany

4 INSTALLATION Caution. Be careful when setting jumpers or performing any actions within the product so that you do not bend or break any components. Installation of FOM 5A and FOM-6A is straightforward and simple. Just follow these instructions: 1. To access the switches: For FOM-5A: Insert a slim screwdriver under the FOM-5A nameplate and ease the nameplate off. For FOM-6A: Open the unit by pressing the places marked on the sides. 2. Strap the modem according to the strapping diagram (Figure 1 or Figure 2) and the strap selection table (Table 1). Explanations of the switches are also given on the printed circuit board. 3. FOM-5A and FOM-6A are factory set for DCE. For DTE operation, move the switch to the DTE position. 4. To close the unit: For FOM-5A: Snap the nameplate back into place. For FOM-6A: Press the two halves of the unit together. 5. Plug the modem directly into the 25-pin connector of the terminal/computer port and tighten the screws on each side of the modem connector. 6. Remove the plastic dust caps from the fiber optic connectors and connect the cable to the unit. Observe the following directions: TX on the local modem should be connected to RX on the remote modem RX on the local modem should be connected to TX on the remote modem. FOM-5A, FOM-6A is now ready for operation. The red DATA LED lights when transmission occurs. Figure 1. FOM-5A Strapping Diagram Strap Identify CARR DLY DCE/DTE Switch Figure 2. FOM-6A Strapping Diagram Table 1. Strap/Switch Selection Function Position Factory Setting Selects Carrier constantly ON or controlled by On (ON) Controlled (CL) Selects /CTS delay 2 msec 15 msec Selects DCE or DTE DTE DCE ON 2 msec DCE

5 DCE Position DTE Position TD 2 DI TD 2 DI RD 3 DO RD 3 DO CTS DSR D 300 ohm +V CTS DSR N.C. CD DCD DTR 8 CD DCD ohm 20 DTR 20 +V Figure 3. DTE/DCE Switch Operation