CSS GENERAL -INTRODUCTION TO ARINC 628
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CABIN SERVICES SYSTEM -GENERAL DESCRIPTION
General
You use cabin control panels (CCPs) to operate the CSS. The hardware configuration of a CCP tells it to operate as a cabin area control panel (CACP) or a cabin system control panel (CSCP).
The CSS uses a configuration database to define the cabin interior. You change the configuration database to agree with changes in the cabin interior.
Operation
Maintenance personnel use the CSCP to test and to program the CSS. Flight attendants use the CSCP and the CACPs to select light settings and other monitor and control functions. The CSCP also has a mass storage device to keep program data and test results.
The cabin system management unit (CSMU) sends test commands. It also has interfaces with other airplane systems for some CSS functions.
The passenger address/cabin interphone (PA/CI) controller controls the passenger address and cabin interphone functions. It controls routing of cabin interphone calls. The PA/CI controller gets passenger address audio inputs and sends them through the speaker drive modules (SDMs) to cabin speakers. The ambient noise sensors (ANSs) supply cabin noise levels for automatic volume adjustment.
There are three zone management units (ZMUs). The ZMUs control these zones:
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ZMU 1 controls zone 1
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ZMU 2 controls zone 2
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ZMU 3 controls zone 3.
In each zone, the ZMUs connect to these three types of LRUs:
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Overhead electronics units (OEUs)
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Cabin attendant handsets (CAHs)
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Cabin control panels (CCPs).
The OEUs control lights and passenger information signs. They also receive inputs from other cabin systems.
Flight attendants use CAHs to talk on the cabin interphone and to make passenger address announcements.
Flight attendants use the CACPs to select cabin light settings, set some passenger service functions and operate the monitor and control functions.
The ZMUs also have an interface with the in-flight entertainment system. The passengers use controls at the passenger seat to control reading lights and make attendant calls.
The CSS components operate together in five subsystems.
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CABIN SERVICES SYSTEM -GENERAL DESCRIPTION
Passenger Address System (PAS)
The PA/CI controller gets audio inputs from different sources. It selects the highest priority audio, digitizes it and sends it to the SDMs and the in-flight entertainment system. The SDMs change the signal back to analog and send it to one or two speakers. The inflight entertainment system overrides entertainment audio at the passenger seat with PA audio.
The PAS also supplies chimes to the cabin.
Cabin Interphone System (CIS)
CAHs connect to ZMUs to send and receive audio and dial codes. The ZMUs have a digital interface with the PA/CI controller. The PA/CI controller makes the connection between attendant stations.
When a station gets a call, the PAS makes a chime and the ZMU makes a master call light come on.
The flight crew interface to the CIS is almost the same, except the flight interphone system and flight deck handset connect directly to the PA/CI controller.
Passenger Service System (PSS)
Passengers use controls at the passenger seat to control reading lights and to call attendants. The passenger selections go to the ZMU over an ARINC 628 zone interface. The ZMU sends the data to an OEU. The OEU makes a reading light or row call light come on. For an attendant call, the ZMU also makes a master call light come on. The PAS makes a chime sound.
Cabin Lighting System (CLS)
The CLS uses these four types of lights:
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Sidewall wash lights
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Indirect ceiling lights
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Direct ceiling lights
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Night lights.
Flight attendants use the CACPs to select light settings. The CACPs send the selection to the ZMUs. The ZMUs send signals to the OEUs which make the applicable lights go on or off.
Monitor and Control Functions
The CSS monitors many other cabin systems. This gives the flight attendants a central location to select cabin controls. Attendants use the CSCP and CACPs for monitor and control functions.
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CABIN SERVICES SYSTEM -GENERAL DESCRIPTION
The monitor function shows information only. These are some of the monitored systems:
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Potable water status
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Waste tank status
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Cabin door status
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Smoke detectors.
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