| Technical Data
GENERAL DESCRIPTION
VERSITRON FOM II Series Model F2238/F2240/F2245 High Speed fiber optic modems provide synchronous or asynchronous data transmission at speeds up to 10 Mbps, at distances up to 15 Km with fully transparent operations. Supporting RS-530 or MIL-STD-188C interfaces, these modems multiplex clock and data signals. They operate as two-channel multiplexer/modems. For high-speed synchronous operation, the first channel is used for data and the second is used for the transmit clock. Both channels may be used for data in low-speed asynchronous operation, typically at less than 100 Kbps.
Designed for a wide variety of applications, the F2238/F2240/F2245 modems can operate in one of three different modes: Automatic, Forced Asynchronous, or Forced Synchronous. Both stand-alone enclosures rack-mount chassis configurations are available for the modems.
FEATURES
In the automatic mode the F2238/F2240/F2245 modems can operate at any synchronous data rate from 250 Bps to 100 Kbps.They will also operate with variable data rates that are sometimes found with high-speed telemetry systems. An internal bit-rate monitor selects the source of the transmit clock. At clock rates less than 100 KHz (or if no clock is present), the modems utilize an internal 10 MHz reference signal as the clock. This assures a sufficiently large number of samples for minimum end-to-end timing jitter. At clock frequencies greater than 100 KHz, the actual clock signal is used.
In the Forced Asynchronous mode the internal 10 MHz reference is used. In the Forced Synchronous mode the internal reference is disabled and the transmit clock is used regardless of the data rate. The minimum data rate in this mode is 250 Bps.
Local and remote modems can be set to operate in different modes. This permits operation in one direction at 10 Mbps synchronous and 250 Bps asynchronous in the other direction, for example. After operating mode and interface options are selected, the modems do not require further adjustments regardless of the data rate.
Three different fiber modules are offered to maximize installation flexibility: 850nm multimode, 1300nm multimode, and 1300nm singlemode. Color coded LEDs provide status indicators on the modem front panels. A convenient front panel switch selects loopback mode which connects the transmitter output to the receiver input. On the fiber optic side of the modem the output of the fiber optic receiver is connected to the transmitter. This allows for testing of nearly all of the circuits.
SELECTION GUIDE
| Model |
F2238
|
F2240
|
F2245
|
| Optics |
850nm
|
1300nm
|
1300nm
|
| Connectors |
ST
|
ST
|
ST
|
| Operating Distance |
2 km
|
6 km
|
15 km
|
| Fiber |
Multimode
|
Multimode
|
Singlemode
|
TECHNICAL SPECIFICATIONS
| Data Rate: |
250 Bps to 10 Mbps synchronous
250 Bps to 100 Kbps asynchronous |
| Operation: |
Full Duplex, half duplex, simplex |
| Optical Connector: |
ST |
| Fiber Cable: |
50/125, 62.5/125 or 100/140 mm (with 850nm multimode optics)
50/125 or 62.5/125 mm (with 1300nm multimode optics)
9/125 or 10/125 mm (with 1300nm singlemode optics) |
| Link Margin: |
F2238: 18db, F2240: 16db, F2245: 22db |
| Error Rate: |
Better than 10 to the minus 9th. |
| Digital Interface: |
Signal levels and format conform to EIA RS-530-synchronous, asynchronous and MIL-STD-188-114 balanced, unbalanced: |
| Electrical Connector: |
DB25 Female (DCE) |
| Power Requirements: |
12 VDC @ 1.5A |
| Operating Temp: |
0° to 50°C (32° to 122°F) |
| Relative Humidity: |
Up to 95% (non-condensing) |
| Altitude: |
Up to 10,000 feet |
| Dimensions: |
1"H x 7"W x 11"L (2.5cm H x 17.8cm W x 27.9 cm L) |
| Weight: |
12 oz. (0.34 kg) |
| |
