Specifications

Installation and Operation Manual Chapter 1 Introduction
FOM-E3, FOM-T3 Ver. 1.0 Overview 1-3
FOM-E3 and FOM-T3 operates with several different grades and sizes of fiber
optic cable and provide the user with:
• Extended high-rate range transmission
• Immunity to electrical interference such as EMI, RFI, spikes, and differential
ground loops
• Secure data transfer (transmitted information cannot be tapped)
• Protection from sparks and lightning
• Secure link in hazardous or hostile environment.
Table 1-1. FOM-E3 and FOM-T3 Fiber Optic Interface Options
Wavelength
[nm]
Fiber Type
[μm]
Transmitter Type Typical
Power
[dBm]
Receiver
Sensitivity
[dBm]
Typical
Max. Range
[km] [mi]
850 62.5/125 multimode VCSEL -15 -34 4.5 2.8
1310 9/125 single mode Laser -12 -31 38 23.6
1310 9/125 single mode Laser (long haul) -2 -34 70 43.4
1550 9/125 single mode Laser -12 -31 68 42.2
1550 9/125 single mode Laser (long haul) -1 -34 110 68.3
1310/1550 9/125 single mode Laser (WDM), SF1, SF2 -12 -30 40 24.8
1310 9/125 single mode Laser (single strand fiber), SF3 -12 -27 20 12.4
Alarms
When FOM-E3 or FOM-T3 detect that electrical interface levels are below G.703
electrical levels, the modem transmits an "all 1s" signal (AIS) to the optical
interface.
When an AIS is detected at the optical or electrical interface, the modem
transparently converts the signal and alerts the user via front panel LEDs and the
alarm relay port.
Likewise, an alarm is relayed if high bit error rate detected at the fiber optic
interface.