RAD FOM-8

ORDERING FOM-8 FOM-8/*/+/# Miniature Synchronous/Asynchronous Short Range Sync/Async Fiber Modem Optic Modem * Specify 25-pin connector: F for female M for male + Specify connector: SMA for SMA connector for ST connector ST FC for FC connector (Default is SMA connector) # Specify wavelength: 13 for 1300 nm (Default is 820 nm) Specifications are subject to change without prior notice. 305-100-05/99  1999 RAD Data Communications Ltd. • FOM-8 is designed to operate with FEATURES DESCRIPTION several grades and sizes of fiber optic cable. Two different optical interfaces are • The FOM-8, Synchronous/Asynchronous • Synchronous or Asynchronous available: Short Range Modem, is used for local transmission data distribution, connecting full or half − 820 nm for use with multimode fibers • Data rates up to 19.2 kbps duplex Sync or Async DTEs to other − 1300 nm for use with single mode DTEs, over fiber optic cable. FOM-8 fibers. • V.54 diagnostics, including local and operates at data rates up to 19.2 kbps. • FOM-8 incorporates all the advantages of remote tests • FOM-8 performs diagnostic loops in a fiber optic system: • Supports transmission over single compliance with ITU V.54 standard. Two − Lower attenuation than with copper mode or multimode fiber V.54 loops are available: analog loop wires; additionally, attenuation is not (V.54 Loop 3) and remote digital loop related to frequency. • Full or half duplex (V.54 Loop 2). The loops are activated by − EMI/RFI immunity, which saves the DTE interface signals Circuit 141 (Pin 18) • Plugs directly into the RS-232/V.24 cost of expensive and heavy shielding and Circuit 140 (Pin 21). connector and complex error checking devices. • Asynchronous transmission is provided by − Security is almost absolute. The cost of • Internal, external, or receive clock internal conversion from Async to Sync in data encryption is reduced. compliance with ITU V.22 bis standard. • Ruggedized metal enclosure Eavesdropping is virtually useless, as Different Async formats are switch the fibers generate negligible power. selectable. • No AC power required − Safety and electrical isolation - no • In the Synchronous mode, transmit timing • Miniature, lightweight, easy to install spark hazard or ground-loop noise is provided by three alternative sources: problems. • Card version for 19" modem rack − Internal oscillator • Innovative circuitry design allows − External clock operation without a power supply, by − Loopback clock derived from the APPLICATION using ultra-low power from the standard receive signal. RS-232/V.24 data and control signals. For • The modem’s carrier can be strapped for proper operation, both data and at least either continuous operation, or for one control signal must be connected. i.e. Transmit Data, Receive Data, Signal switched operation. In switched operation, Ground, and either RTS or DTR. the carrier is controlled by the RTS signal, and enables transfer of a control signal • FOM-8 is compatible with the CMN-CF8 end-to-end. card of the 19" CMN-16 modem rack. • Transmission Controls • DTE Interface SPECIFICATIONS DCD (Circuit 109) turns ON after EIA RS-232/ITU V.24 integral 25-pin recognizing receive signal from the line. connector, male or female option • Data Rates (Sync or Async) CTS (Circuit 106) turns ON 0, 8, or • Optical Interface 1.2, 2.4, 3.6, 4.8, 7.2, 9.6, 14.4, 19.2 kbps 64 msec (selectable) after the terminal SMA, ST or FC connector (see Ordering) Selectable by a rotary switch raises RTS (Circuit 105). • Power • Number of Data Bits (Async Mode) DSR (Circuit 107) is ON when the modem None required; uses ultra-low power from 8, 9, 10, or 11 including 1 start and 1 stop is powered. the RS-232/V.24 data and control signals. bit, with or without parity Test Mode (Circuit 142) turns ON when To ensure proper operation, the • RTS/CTS Delay the modem is in one of its diagnostic equipment connected to FOM-8 should 0, 8, or 64 msec loops. provide at least one of the following • Frequency Allowance (Async Mode) • Optical Output Levels signals: Shortening of stop bit on receive end is -30 dBm into 100/140 fiber RTS (Circuit 105) or DTR (Circuit 108.2). selectable: -32 dBm into 62.5/125 fiber The typical power consumption drawn − 12.5% allows frequency difference -36 dBm into 50/125 fiber from the DTE is 75 mW (at +6V signal between the async terminal and FOM-8 -31 dBm into 9/125 fiber level). of -2.5% to +1.0% • Receiver Sensitivity • Physical − 25% allows frequency difference -45 dBm for 820 nm Height: 23 mm / 0.9 in of -2.5% to +2.3% -47 dBm for 1300 nm Width: 53 mm / 2.1 in • Transmission Line • Operating Wavelength Depth: 110 mm / 4.3 in Dual optical cable Multimode: 820 nm Weight: 140g / 4.9 oz • Transmission Mode Singlemode: 1300 nm • Environment Sync or async, full or half duplex Temperature: 0-50°C / 32-122°F Humidity: Up to 90%, non-condensing 3. Close the unit by pressing the two halves Declaration of Conformity INSTALLATION of the cover together. Fasten the four screws. Mfr. Name: RAD Data Communications Ltd. Caution. This is a delicate instrument. Be careful Mfr. Address: 12 Hanechoshet St. when setting jumpers or performing any actions 4. Plug the modem directly into the 25-pin Tel Aviv 69710 within the product so that you do not break or connector of the DTE or computer port. Israel shake any components. Fasten the screws on each side of the modem connector. Installation of FOM-8 is simple and declares that the product: straightforward. Follow these steps: 5. Remove the plastic dust caps from the Product Name: FOM-8 fiber optic connectors and connect the 1. Separate the two halves of the case by cable to the unit. Observe the following: opening the four screws which are Conforms to the following standard(s) or other located on the bottom cover. • Connect TX on local FOM-8 to RX normative document(s): EMC: EN 55022 (1987): Limits and on remote FOM-8 2. Strap the modem according to mode methods of measurement of radio (see Tables 1 and 2 and Figure 1): • Connect RX on local FOM-8 to TX disturbance characteristics of on remote FOM-8. Sync Mode information technology equipment. The dip switch positions of S1, S2 and FOM-8 is now ready for operation. EN 50082-1 (1992): S3 have no effect in sync mode. Electromagnetic compatibility - Generic immunity standards for Async Mode residential, commercial and light Set the Clock/Mode switch to Async . industry. Set switches S1, S2, S3, and S4 according to the application Supplementary Information: requirements. The product herewith complies with the requirements of the EMC Directive 89/336/EEC. The product was tested in a typical configuration. Tel Aviv, December 28th 1995 Haim Karshen Quality Manager European Contact: RAD Data Communications GmbH, Lyoner Strasse 14, 60528 Frankfurt am Figure 1. Strapping Diagram Main, Germany Table 1. Strap Selection Table 2. Async Character Length Setting OPERATION Strap Function Possible Factory Start Data Parity Sto No. Switch • Normal Operation Identity Settings Setting Bit Bits p of Setting Make sure the loopback is not activated Bit Bits S2 S3 Baud Selects data 0 - 19.2 (Pins 18 and 21 should not be connected Rates transmit rate 1 - 14.4 1 5 none 2 8 OFF or have negative voltages). (kbps) 2 - 9.6 9.6 OFF 3 - 7.2 • Test Mode 1 6 none 1 8 OFF 4 - 4.8 FOM-8 performs two of the V.54 test 1.5 OFF 5 - 3.6 2 loops. Figure 2 illustrates analog loop 6 - 2.4 (ANA) (V.54 Loop 3) and Figure 3 shows 7 - 1.2 1 6 odd, 1 9 OFF ON RTS- Selects 0, 8 or 64 8 even 1.5 remote digital loop (REM) (V.54 Loop 2). CTS RTS-CTS delay 2 Both loops are controlled by DTE Delay (msec) 1 7 none 1 9 OFF ON interface Pin 18 (ANA) and Pin 21 (REM). Clock/ Selects timing ASYNC 1.5 When the modem performs one of its Mode clock (in sync RECEIVE 2 diagnostic loops, Pin 25 mode) or async INTERNAL INTERNAL 1 7 odd, 1 10 ON OFF mode EXTERNAL (Circuit 142) is set ON. even 1.5 Async Selects S2 S3 No bits 2 Format character length OFF OFF 8 in async mode OFF ON 9 1 8 none 1 10 ON OFF (see Table 2) ON OFF 10 10 bits 1.5 ON ON 11 2 Selects the S1 1 8 odd, 1 11 ON ON amount of stop ON– 25% even 1.5 Figure 2. Analog Loop bit shortening to OFF– 12.5% 12.5% 2 be used in This loop tests the local modem only. async mode The XMT signal to the line is returned to the Carrier Selects carrier S4 receiver. constantly on or ON– controlled by CONTROLLED CONST. ON RTS OFF– CONST. ON Pin 18 Enables DTE S5 control of analog ON– ENABLE loop OFF– DISABLE DISABLE Figure 3. Remote Digital Loop Pin 21 Enables DTE S6 control of ON– ENABLE This loop tests the local modem, the line and remote digital OFF– DISABLE DISABLE the remote modem. loop