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The following describes a series of ﬁve appliances which will

provide a way to interface both audio and control signals from

conventional audio equipment to Livewire networks. The series

will include:

» Analog audio interface

» AES/EBU audio interface

» Microphone audio interface

» GPIO logic interface

» Mixed Signal interface including a mixture of analog,

AES/EBU and Microphone audio, and GPIO logic interfaces

The signals received by these appliances shall be converted into

network packets and delivered to a network supporting multi-

cast (as deﬁned in RFC-1112).

The appliance shall be of a professional design, suitable for use

by broadcasters, pro audio technicians, and others requiring

reliable, 24/7 unattended operation. The appliance shall feature

professional audio inputs and outputs and/or support GPIO con-

trol logic up to 48 volts. The appliance shall have a front-panel

display which enables audio monitoring and basic conﬁguration.

The appliance shall include remote monitoring and conﬁguration

accessible via standard Web browser.

The appliance shall stream up to 4 stereo or 8 mono channels to

a network. The appliance will receive up to 8 streams from a net-

work. The appliance shall support power over Ethernet (PoE) as

deﬁned in IEEE 802.3af-2003 allowing the appliance to operate

without direct connection to AC power mains. The appliance shall

connect to the studio network via 100Base-T Ethernet for superi-

or noise/RF immunity, and shall provide two Ethernet connectors

for dual-redundant connections to the network switch fabric.

The appliance shall consist of a 1RU, 9.5” x 11” (25 x 28 cm.) en-

closure. Appliances shall include provisions for side by side rack

mounting, or wall mounting, with accessory rack-mount or sur-

face-mount kit. The front panel shall be an attractive, yet func-

tional design with a bright, clear OLED-based display, controls

to invoke display of status information and setup mode, and a

multi-color LED to convey power conﬁguration information. Heat

sinks are integral to the front panel, eliminating the need for fans

or cooling via rack air. The appliance shall be quiet in operation,

fanless, and connect to AC power via an IEC power entry mod-

ule. AC power input shall be of universal design, accommodating

worldwide standard AC power voltages and frequencies. Appli-

ance shall further be capable of utilizing drawing PoE power from

an attached Ethernet switch as deﬁned in IEEE 802.3af-200.

Microphone, Analog and AES/EBU versions shall have audio in-

The AoIP audio I/O functionality of descrbed appliances shall be

fully compatible with the Livewire AoIP standard.

Microphone appliance shall have four professional-grade micro-

phone preamps with selectable Phantom power and software-

adjustable gain, and four balanced stereo analog line outputs.

Analog appliance shall have audio inputs which may be conﬁg-

ured as either eight mono or four stereo balanced line-level in-

puts, and audio outputs which may be conﬁgured as either eight

mono or four stereo balanced line-level outputs. Connections

shall be presented on both RJ-45 and DB-25 connectors. Each in-

put shall be switchable to accommodate either consumer-level

-10dBv or professional level +4dBu sources.

AES/EBU appliance shall have audio inputs which may be conﬁg-

ured as either eight mono or four stereo balanced line-level in-

puts, and audio outputs which may be conﬁgured as either eight

mono or four stereo balanced line-level outputs. Connections

shall be presented on both RJ-45 and DB-25 connectors. Outputs

shall be short-circuit protected.

Mixed-Signal appliance shall have one selectable Mic/Line ana-

log input, two dedicated stereo analog line inputs, three stereo

analog line outputs, one stereo digital AES3 input and one stereo

AES3 output. Microphone input shall have selectable Phantom

power and software-adjustable gain. Outputs shall be short-

circuit protected.

GPIO appliance shall have six general-purpose logic ports, pre-

sented on DA-15 connectors. Each port shall include ﬁve opto-

isolated inputs and ﬁve outputs. These logic ports shall be able, by

means of software conﬁguration, to be associated with device(s)

which provide audio input or output to Livewire AoIP networks.

ARCHITECT'S SPECIFICATION

PHYSICAL

AUDIO INPUT AND OUTPUT

MACHINE CONTROL LOGIC

puts and outputs presented both on RJ-45 and high-density DB-

25 female connectors.

Mixed-Signal versions shall have two high-density DA-15 female

connectors for GPIO logic. Appliance shall further include eight

RJ-45 connectors for analog and AES/EBU audio, and one XLR-F

bulkhead connector for microphone audio.

GPIO xNode shall have six high density DA-15 female connectors.

The rear panel of all appliances shall provide two Ethernet/IP (net-

work) connections on standard RJ-45 bulkhead connectors.

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