15
CHAPTER 3: Installation and Setup
2. Connect the T3 electrical interface (see Section 3.3.2).
3. Connect the fiberoptic interface (see Section 3.3.2).
4. Connect power to the line driver.
3.3.1 S
ETTING THE
I
NTERNAL
J
UMPERS
This section provides information on the functions of the line driver’s jumpers and
gives step-by-step instructions for performing the internal settings. The default
settings are also listed.
Locations of jumpers and switches
The T3 Fiber Optic Line Driver includes three printed circuit boards: the main
board, the T3 interface board, and the fiberoptic interface board (see Figures 3-1
and 3-2).
The main board contains the common signal-processing circuits. One jumper
(JP2) is provided for user settings.
The T3 interface board provides connection to the T3 link. The T3 board contains
jumpers for selecting the T3 cable length.
The fiberoptic interface board provides connection to the fiberoptic cable. The
fiberoptic board does not contain any jumpers or switches.
Opening the case
To reach the line driver’s internal jumper and switch, you’ll need to open its case.
WARNING
Only authorized and qualified service personnel should open the line
driver.
To avoid accidental electric shock, always disconnect the interface
cables and the power cord before opening the line driver.
Line voltages are present inside the line driver when it is 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.
