Specifications

Chapter 2 Installation and Setup Installation and Operation Manual
2-2 Installation and Setup FOM-E3, FOM-T3 Ver. 1.0
2.3 Installation and Setup
FOM-E3 and FOM-T3 are standalone devices intended for tabletop or bench
installation. They are delivered completely assembled. No provision is made for
bolting the unit on the tabletop.
 To install FOM-E3 or FOM-T3:
1. Determine the required configuration of FOM-E3 or FOM-T3, according to
your application, and set the internal jumpers and switches accordingly.
2. Connect the E3/T3 electrical interface.
3. Connect fiber optic interface.
4. Connect power to the unit.
Setting the Internal Jumpers
This section provides information on the functions of the FOM-E3 and FOM-T3
jumpers, and gives step-by-step instructions for performing the internal settings.
The default settings are also listed.
Locations of Jumpers and Switches
FOM-E3 and FOM-T3 include three printed circuit boards (PCBs): the main board,
E3/T3 interface board, and fiber optic interface board (see
Figure 2-1 , Figure 2-2,
and
Figure 2-3 .
The main board contains the common signal processing circuits. One jumper, JP5,
is provided for user settings.
The E3/T3 interface boards provide connection to the E3/T3 links. The E3/T3
boards contain jumpers for selecting the E3/T3 cable length.
The fiber optic interface board provides connection to the fiber optic plant. The
fiber optic board does not contain any jumpers or switches.
Opening the Case
To reach the internal jumper and switch of FOM-E3 and FOM-T3, open its case.
Access to the inside of FOM-E3 and FOM-T3 is permitted only to authorized and
qualified service personnel.
To avoid accidental electric shock, always disconnect the interface cables and the
power cord before removing the units from their casing.
Line voltages are present inside FOM-E3 and FOM-T3 when they are connected to
power and/or to the lines. Moreover, under external fault conditions dangerous
voltages may appear on the lines connected to the units.
Any adjustment, maintenance, and repair of the opened equipment under voltage
should be avoided as much as possible and, when absolutely necessary, should
be carried out only by a skilled technician who is aware of the hazard involved.
Capacitors inside the instruments may still be charged even after the instruments
have been disconnected from their power source.
Warning