Telecast Fiber Systems
Introduction
1
The Telecast Adder™ 161 System consists of an Adder 161 TX fiber optic transmitter/
multiplexer and an Adder 161 RX receiver/demultiplexer. The TX unit multiplexes and
sends up to 16 audio signals, two digital data signals, and four remote relay closures.
The RX unit receives the transmission and restores the analog signals. Audio inputs
are set up by internal DIP switches that set amplifier gain to accept either mic or line
level. Audio outputs are always at line level. Two of the four digital connectors provide
RS-422 and RS-232 compatible signals in one direction. The four digital connectors
also provide remote contact closures transmitted in one direction. An internal Ni-Cad
battery provides backup power in the event of line power loss.
The Adder 161 is available in a compact, lightweight 19 inch rack mount. The electrical
connections connections are discussed later in this manual.
Within an Adder 161 TX transmitter unit, the audio signals are first digitized and then
multiplexed with the digital control signals. The combined electrical signal is converted
to an optical signal and launched into the fiber optic cable. All signals are restored at
the receiver.
The Adder 161 TX has a port to allow clock synchronization with additional Telecast
products.
* The Adder 161 also has a coaxial cable link that may be used as an alternate to the
fiber.
Installation
Unpacking
The Adder 161 System consists of:
• One Adder 161 TX Transmitter
• One Adder 161 RX Receiver
• Two external power supplies (AC/DC adapters)
• Plastic or metal covers for optical connectors
• Hardware kits for rack mount units
After unpacking, inspect the units for mechanical damage. Inspect all electrical
connectors for bent or damaged pins and latches. Report any damage to the carrier
and to Telecast Fiber Systems, Inc.
Leave the protective plastic caps on the optical connectors until it is time to attach the
fiber to the units. Store the caps for later use. Replace the caps on to the connectors
whenever the fiber is left disconnected.
Summary of Contents for Adder 161
Page 2: ...Adder 161 ii...
Page 18: ...Adder 161 Figure 14 TX Audio Input Stage 14...
Page 25: ...Telecast Fiber Systems 21...
