FOMi-40 Fiber Optic Modem with Remote Management from RAD
FOMi-40 is a fiber optic modem that provides a secure and long-range (up to 100 km/62 mi) data link between computers, routers, multiplexers, or other data communication devices. It operates at 14 selectable synchronous data rates from 56 kbps to 2048 kbps. RAD FOMi-40 converts electrical signals from a DTE into optical signals via an infrared light emitting diode or a laser diode. At the opposite end of the fiber, the optical signals are converted back into electrical signals in compliance with the appropriate interface.
Master and slave versions of FOMi-40 are available. The master standalone version features a front panel LCD. The slave unit has a blank front panel with a 20-pin connector that connects to a Portable Control Unit (PCU). The PCU is used to monitor and change parameters of the slave or master modem and monitor system alarms.
The RAD FOMi-40 uses an inband management channel for controlling and monitoring the remote unit. Data and management are simultaneously transmitted over the same fiber link, without interference. Menu-driven software, accessed from the front panel, allows the user to monitor and control the following parameters on local and remote modems:
Data rate (when set to internal or receive mode)
Internal BER tester activation
LED status of local and remote units
Local and remote unit settings
Real-time alert of fault conditions.
FOMi-40 supports the following three timing modes:
Internal, from a built-in oscillator
External, from the attached DTE
Receive, from the signal received over the line.
In the external mode setting, FOMi-40 automatically detects the clock rate coming from the digital interface and sets the remote unit to work at the same rate. When the data rate of the external clock changes, both local and remote units automatically synchronize to the new rate.
FOMi-40 utilizes a phase locked loop (PLL) circuit to recover jitter-free data and clocking from the optical signal.
FOMi-40 is designed to operate with several grades and sizes of fiber optic cable and offers the following optical interfaces:
850 nm LED/VCSEL for multimode fibers
1310 nm laser for single-mode fibers
1550 nm laser for single-mode fibers.
Immunity is provided against electrical interference such as EMI, RFI, spikes and differential ground loops. Protection is provided against sparking and lightning, and a secure link is maintained in hazardous or hostile environments. Diagnostics include V.54 local analog, remote digital loop tests, and an internal V.52 BER tester. The loops can be activated from the front panel, the PCU, the central SNMP management, or the digital interfaces that support loop activation signals. An internal BER tester that complies with V.52/511 pattern is also available.
FOMi-40's field-changeable interface includes an optional built-in Ethernet bridge interface. This option can be used
for LAN-to-LAN connectivity over the fiber link, using only a pair of FOMi-40 units.
The FOMi-40 system configuration is stored in non-volatile memory to minimize system downtime when power is lost or when a faulty unit is replaced. The inband management channel provides real-time alerts for:
Disconnection of the digital data
Disconnection of the management channel
Remote modem failure
The front panel LCD provides real-time indication of system status on both the local and the remote modem.
The card versions FOMi-40C (single modem) and FOMi-40CD (double modem) are available for installation in
LRS-24, a 19-inch modem rack with SNMP management that accommodates up to 24 modems. These card versions can be managed in an LRS-24 hub from an ASCII terminal or by RADview, RAD's SNMP management application that runs on PC or HPOV UNIX platforms.
FOMi-40 supports a variety of digital interfaces, including V.24/RS-232 (64 bps), V.35, X.21, RS-530, V.36/RS-449, G.703 Codirectional (64 kbps), G.703 E1, G.703 T1, and 10/100BaseT bridge supporting IEEE 802.3× flow control and backpressure.
RAD FOMi-40 product data sheet (pdf)
Popular FOMi-40 models include: