Specifications

FOM-E3, FOM-T3 Ver. 1.0 Installing FOM-E3 and FOM-T3 1
Quick Start Guide
If you are familiar with FOM-E3 and FOM-T3 fiber optic modems, use this guide to
prepare the units for operation.
1. Installing FOM-E3 and FOM-T3
Open the FOM-E3 and FOM-T3 case by releasing the two rear panel screws and
sliding out the PCB interior of the unit.
Setting the Main Board Jumpers
Set the main board jumper according to the following table:
Jumper Description Values (factory seting in bold)
AIS, JP5 Controls the AIS transmission to the
electrical or optical interface, when a
minor alarm is detected
ON – AIS is transmitted
OFF – AIS is not transmitted
Selecting the E3/T3 Cable Length
Refer to the tables below and select the cable length, depending on your unit's
interface type: E3 or T3.
Jumper Description Values*
E3 Cable Length
Jumper, JP2
Selects the E3
cable length
Pins 1, 2 – Cable length is from 0 to 300 ft
Pins 2, 3 – Cable length is more than 300 ft
Note: The maximum possible cable length complies with ITU-T G.703.
T3 Cable Length
Jumper Positions
JP1 JP2 JP3
0 ft – 225 ft Pins 2, 3 Pins 1, 2 Pins 2, 3
225 ft – 450 ft Pins 1, 2 Pins 1, 2 Pins 1, 2
More than 450 ft Pins 1, 2 Pins 2, 3 Pins 1, 2
Note: The maximum cable length complies with ITU-T G.703.
* Factory settings are shown in bold.