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Zone Management Unit Interfaces
The intersystem bus from ZMU 1 connects to ZMU 2 which also connects to ZMU 3. Each ZMU uses the data from this bus to control their related zone components.
The ARINC 628 zone interface bus provides an interface with the in-flight entertainment system for passenger service functions.
EFFECTIVITY
BEJ ALL

ZMU 2 sends analog microphone audio and a PTT signal to ZMU 1 for the passenger address direct access function. ZMU 2 also gets audio and a PTT signal from ZMU 3 to send to ZMU 1. ZMU 1 sends the signals to the PA/CI controller.
Cabin Attendant Handset Interfaces
Attendants use the cabin attendant handsets (CAHs) for cabin interphone calls and passenger address announcements. Each ZMU connects to as many as five CAHs. The CAH sends microphone audio, a PTT, and dialing signals to the ZMU. The ZMU sends receive audio to the CAH.
Each ZMU can have only one passenger address direct access interface. Attendants use the CAH that has a direct access button on the handset cradle to energize a relay in the ZMU. The interface between the cradle and the ZMU is a power signal, set signal, and reset signal.
Master Call Light Interfaces
Each ZMU controls as many as 30 master call lights. Ten master call lights are for cabin interphone calls. Twenty master call lights are for passenger to attendant calls.
Overhead Electronics Unit Interfaces
Each ZMU connects to three columns of overhead electronics
units (OEUs). The data bus uses an EIA-485 type of data format.

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CSS GENERAL -ZONE MANAGEMENT UNIT 1 INTERFACES
OEUs control lights and passenger information signs. They also monitor different inputs. The token signal is for test and software installation.
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CSS GENERAL -ZONE MANAGEMENT UNIT 1 INTERFACES

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CSS GENERAL -CABIN CONTROL PANEL

Purpose
You use the 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).
Flight attendants use the the CSCP or the CACPs to control CSS functions. Maintenance personnel use the CSCP to do tests and to install software.
Physical Description
The CCP weighs 13 pounds. These are the dimensions:
*
Length -16.5inches

*
Width -10.4inches

*
Height -3.3inches.

　
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