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CSS GENERAL -POWER INTERFACE -ZONE 3
General
Components on the left, right, and standby power management panels control power to these zone 3 LRUs:
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Left, center, and right overhead electronics units (OEUs)
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Zone management unit (ZMU) 3
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Speaker drive modules (SDMs).
Components
The P110 left power management panel has these components:
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OEU ZONE3 LEFT MAIN BUS circuit breaker
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OEU ZONE3 CENTER MAIN BUS circuit breaker
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OEU ZONE3 RIGHT MAIN BUS circuit breaker
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OEU ZONE3 XFER BUS circuit breaker
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ZONE MGMT UNIT 3 circuit breaker.
The P210 right power management panel has the PAX MASTER CALL LT circuit breaker.
The P310 standby power management panel has these components:
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PA DIR ACCESS circuit breaker
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CAB INTPH ZMUS circuit breaker
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SDM COL 3 circuit breaker.
Overhead Electronics Unit Power
These circuit breakers connect 115v ac to the OEUs:
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OEU ZONE3 LEFT MAIN BUS to the left column of OEUs
*
OEU ZONE3 CENTER MAIN BUS to the center column of OEUs
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OEU ZONE3 RIGHT MAIN BUS to the right column of OEUs
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OEU ZONE3 XFER BUS to all OEUs.
Zone Management Unit Power
These circuit breakers connect power to ZMU 3:
*
ZONE MGMT UNIT 3 -115v ac
*
PAX MASTER CALL LT -28v dc
*
PA DIR ACCESS -28v dc
*
CAB INTPH ZMUS -28v dc.
Speaker Drive Module Power
The SDM COL 3 circuit breaker connects 28v dc to all SDMs in zone 3.
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777 AIRCRAFT MAINTENANCE MANUAL
CSS GENERAL -POWER INTERFACE -ZONE 3
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CSS GENERAL -SYSTEM INTERFACES
General
The CSS uses different buses and interfaces to send data between the CSS components. These are the interfaces with the main CSS components:
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Intersystem (I/S) bus
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Cabin interphone (CI) bus
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Passenger address/cabin interphone (PA/CI) bus.
Intersystem Bus
The intersystem bus is the primary bus the CSS uses to send and get data.
The CSMU, passenger address/cabin interphone (PA/CI) controller, and zone management units (ZMUs) all send and receive data on the intersystem bus.
The intersystem bus passes through the components it connects. Thus, a failure of a component does not cause a failure of the bus.
The intersystem bus uses the IEEE 802.3 10 base 2 data standard for data transfer.
Each cabin control panel (CCP) can send and get commands and data from a related ZMU. The ZMUs change 10 base 2 data from the intersystem bus and send it to the CCP.
Passenger Address/Cabin Interphone (PA/CI) Bus
The passenger address controller gets and sends data on the intersystem bus. The cabin interphone controller does not have an interface with the intersystem bus. Any information the CIC needs from the intersystem bus is sent over the PA/CI bus from the PAC.
Cabin Interphone (C/I) Bus
A cabin interphone bus goes from the CIC to each of the ZMUs. These are the main communication busses for the cabin interphone system. A failure of the intersystem bus would have very little effect on the cabin interphone system. Likewise, a failure of a cabin interphone bus would have very little effect on the passenger address system.
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CSS GENERAL -SYSTEM INTERFACES
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CSS GENERAL -PASSENGER ADDRESS/CABIN INTERPHONE CONTROLLER INTERFACES
General
The passenger address/cabin interphone (PA/CI) controller connects to other CSS components and audio systems to control passenger address and cabin interphone audio.
The PA/CI controller has two passenger address controllers (normal and alternate) and two cabin interphone controllers (normal and alternate). Only one passenger address controller and one cabin interphone controller operate at a time.
CSMU
The cabin system management unit (CSMU) selects which controller is operational. If a normal controller fails, you select the alternate controller from a switch on an attendant switch panel (ASP). The ASP sends a signal to the CSMU. The CSMU sends the signal to the PA/CI controller.
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