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SECTION 1
ESCRIPTION OF EQUIPMENT
1.1 INTRO UCTION
This manual provides general and detailed information on the installation and operation of the
Model F282X FOM II Series Fiber-optic Modems. Section 1 contains a general description of the
equipment. Section 2 covers installation instructions. Section 3 contains operating instructions. Section
4 provides the theory of operation. Section 5 contains maintenance and troubleshooting information.
Figure 1 is an overall view of the Model F282X products.
Model Number Part Number Description
F2822 19932-02 RS-530, 0-76.8 Kbps, multimode, 850nm, ST connectors,
2 Km operational distance.
F2824 19932-04 RS-530, 0-76.8 Kbps, multimode, 1300nm, ST connectors,
6 Km operational distance.
F2825 19932-05 RS-530, 0-76.8 Kbps, multimode, 1300nm, ST connectors,
14 Km operational distance.
1.2 ESCRIPTION OF EQUIPMENT
1.2.1 Functional Characteristics
The Model F282X products are fiber-optic links designed for use as an RS-530 interface
extender (See Figure 2) or a modem link (See Figure 3). These units are DTE/DCE switch selectable
and interface with other VERSITRON FOM II series F282X Fiber Optic Modems. Model F2822 uses
multimode fiber-optic cable of up to 2 Km (6,560 ft.), Model F2824 uses multimode fiber optic cable of
up to 6 Km (19,680 ft.) and Model F2825 uses single mode fiber optic cable of up to 14 Km (45,920 ft.).
The link has a maximum data rate of 76.8 Kbps, providing synchronous, asynchronous or isochronous
full-, half-duplex, or simplex data transmission with fully transparent operation. The unit has internal
clock generation for 18 set frequencies. The Model F282X FOM II modems fully support the interface
control signals associated with the EIA RS-530 and MIL-STD-188-114 standards. This is accomplished
by multiplexing the control signals along with clock and data signals and transmitting this serialized
signal to the remote unit. At the remote unit the signal is demultiplexed and applied to the interface.
1.2.2 Physical Characteristics
The Model F282X FOM II products measure 7.0" wide x 0.84" high x 11.6" deep and are
designed to be placed in a variety of VERSITRON enclosures and chassis (see Table 1 for dimensions of
enclosures and chassis). "Desktop" options include both single- and dual-card enclosures. Rack-mount
options include a 2-card and 20-card chassis. The Unit requires a wall transformer for desktop or 2-card
rack mount operation, with a one-pin connector for electrical input on the back of the card. There is a
female DB25 connector for the RS-530 interface and two ST connectors for the fiber-optic interface,
also on the back of the card. The unit requires a VERSITRON Model AC150W rack-mount power
supply for 20-card operation. Two power supplies are required for redundancy. The unit has seven
indicators: power (PWR), alarm (ALM), transmit data (TXD), receive data (RXD), transmit clock
(TXC), receive clock (RXC), and loopback (LB).
