User guide

22
CHAPTER 2
INSTALLATION AND OPERATION OF THE FTR-
120 NETWORK REPEATER
The FTR-120 (Figure 2.6) is a four-channel network
repeater. A message generated on any network segment
to which the FTR-120 is connected is rebroadcast on the
three other channels.
Figure 2.6. The FTR-120 network repeater
NOTE: See Chapter 1, Planning and
Designing for RMS, for design scenarios
using the FTR-120 network repeater.
There are six status LEDs on the unit:
■ The PWR LED is the power indicator. It is lit if power is
properly supplied to the unit.
■ The other five LEDs give an indication of the amount
of network traffic. The TX1-4 LED flashes whenever a
message is transmitted by the repeater. The RX1, RX2,
RX3, RX4 LEDs flash whenever a message is received
on a particular channel.
For example, if a message is received on channel 1, the
RX1 LED would flash, the message would be transmitted
on the other channels (2, 3 and 4), and the TX1-4 LED
would flash.
Mechanical Installation
The FTR-120 can be mounted on a wall or other surface
using four #6 wood screws (or equivalent). It can be
mounted horizontally with the terminal blocks facing
down, or vertically with the terminal blocks on the right
side. The FTR-120 unit and associated wiring should
be mounted and fastened securely, so that no stress is
incurred. Do not install the FTR-120 in a manner that
would allow unanticipated disconnection.
Network Terminations
The FTR-120 is capable of providing the standard network
termination if desired. As shipped, each channel on
the FTR-120 has 5-ohm network termination resistors
connected. If no termination or 100-ohm network
termination is required, the top must be removed.
Network termination can be changed by moving the
shorting jumper on CN1, CN2, CN3, or CN4. Figure 2.7
and Table 2.1 describe the jumper positions.
Figure 2.7. FTR-120 jumper layout
Table 2.1 FTR-120 Jumper Positions
Channel No.
Termination
5-ohm
Termination
100-ohm
Termination
1 CN4 No Jumper CN4-Jump 1
and 2
CN4-Jump 2
and 3
2 CN3 No Jumper CN3-Jump 1
and 2
CN3-Jump 2
and 3
3 CN2 No Jumper CN2-Jump 1
and 2
CN2-Jump 2
and 3
4 CN1 No Jumper CN1-Jump 1
and 2
CN1-Jump 2
and 3
When installing an FTR-120 network repeater on an
RMS network, avoid using the twisted wire terminator
(provided in the RMS peripheral kit) on the net output of
the loudspeakers connected to the repeater unless the
repeater terminator is removed. Double terminating any
net output will decrease performance.