American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 109)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-104 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

9.8.1 Public Address

9.8.1.1 General

The public address (PA) subsystem shall provide for general announcements, alerts

to existing or pending hazards or emergency warning information to single and

multiple zones within individual and multiple passenger stations, yards, shops and

central control with access and control from various locations and from the Metro

private telephone system. The PA subsystem shall also provide for prerecorded

announcements and paging via the Metro private telephone system.

A. Functional Requirements

1. The PA subsystem shall provide effective a sound-masking system which

utilizes loudspeakers strategically placed to produce uniformly distributed

audio throughout the passenger stations, yards and shops and central

control areas. Uniform audio in both tonality and sound level, at 5 ft

elevation above the walking area, so that normal moving does not result in 5

dB changes in the sound level. The audio inputs shall be prioritized in

accordance with Table 9.1

2. The power amplifiers shall be on hot standby on a one-for-two basis, being

switched to active by a PA supervisory subsystem. The amplifiers shall

drive speakers in backboxes in the station, office, ancillary and low bay

areas; and horn type speakers in the yard and high bay areas and in station

high noise areas such as mechanical rooms and emergency fan rooms.

Level of the power amplifier output based on the ambient noise shall be

automatically adjusted for the track areas, shop areas, mezzanine and

station areas.

3. The PA subsystem shall be fully supervised with failure annunciation of all

major system components items such as preamplifiers, power amplifiers,

supervision tone generators and detectors, power supplies, and speaker

wiring. Failure reporting shall be via SCADA to ROC using dry contact.

4. The primary means of access to the ROC and Yard/Shops PA systems shall

be through the local Metro private telephone system via analog maintenance

telephones and digital administration desk sets. Zone selection shall be

accomplished using the Dual Tone - Multi Frequency (DTMF) keypad to

select any one or all zones for broadcast of audio from the telephone

microphone.

5. The primary means of access to the station PA systems shall be from PA

consoles located at the ROC. PA consoles shall allow a user to select one or

more stations/zones for broadcast of live audio from the console microphone

or pre-recorded announcements stored at the ROC. All audio and control

shall be transmitted over Ethernet.

6. All station PA equipment shall be powered from the communications UPS.

Yard and ROC PA systems shall be powered from the facilities UPS.

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