Tech Works CI Series - PA-BUSS Connector; PA-BUSS Chain

10/29/2019 Tech Works CI-Series Systems Planning & Installation Manual Page 13 of 42
The PA-BUSS (Audio Distribution Buss) has four signal pairs for one-way communication:
“Buss Power” (Option) Current Limited, 23-Volts
“Program” (Audio Option) Background Audio or Music
“Page/Communications” (Audio) Page/Monitor/Communications Audio
“Alert” (Control) Indicates Action is Requested
AMPLIFIER “INPUT” CONNECTOR
AMPLIFIER “OUTPUT” CONNECTOR
PROGRAM_(-) (6)
AMPLIFIER_INPUT_(+) (4)
AMPLIFIER_INPUT_(-) (5)
(4) AMPLIFIER_OUPUT_(+)
(5) AMPLIFIER_OUTPUT_(-)
(6) PROGRAM_(-)
PA-BUSS, AMPLIFIER: Internal Signal Connections, to RJ-45 Connectors
Signal Pairing: (1,2) Power I/O; (3,6) Program/Music or Alert Status; (4,5) Audio; (7,8) Control
POWER_(-) (2)
Power I/O Option (-)
POWER_(+) (1)
Power I/O Option (+)
(3) PROGRAM_(+)
PROGRAM_(+) (3)
SOURCE_ACTIVE_(+) (7)
SOURCE_ACTIVE_(-) (8)
(7) SOURCE_ACTIVE_(+)
(8) SOURCE_ACTIVE_(-)
(1) POWER_(+)
(2) POWER_(-)
Power Pass-Thru Option (+)
Power Pass-Thru Option (+)
Typical PA-BUSS Chain:
POWER
AUDIO
CONTROL
“SOURCE”
“AMPLIFIER”
“AMPLIFIER”
AMPLIFIED
SPEAKER
SPEAKER
AMPLIFIER
PA-BUSS
OUTPUT
POWER
The “Audio Monitoring” may be selectable, adding together the audio sources as desired.
A separate Audio pair, "Program" may contain External Music or Program material.
“Amplifiers” may respond to an “ALERT” logic signal, by muting Music, and outputting
Page/Communications, or other action.
An “Amplifier” is defined as any Unit having a PA-BUSS Input.
Each PA Buss has one "Source”, and a "Chain" of "Amplifiers".
The Source provides Line Level "Page/Communications" Audio, and Control Signal.
A Power Pair is provided for Amplified Speakers, or Microphone Pre-Amplifiers.
The Source and Amplifiers in the "Chain" may share a Power or Control Connection.
The Amplifier may supply power to the Source, or The Source may supply power to the Amplifier.
The supply of power is one or the other, or neither, not both (Jumper Options).
The Audio and Control signal paths are Galvanically Isolated using Transformers and
Opto-Couplers.
Sources and Amplifiers may be locally bonded to Earth by a metal stud on each chassis.