Studio Technologies 45DC Dante to 2-Channel Party Line Intercom Interface

The StudioTechnologies Model 45DC Dante to Dual Party-Line Intercom Interface is designed for applications that utilize single-channel analog party-line (PL) intercom technology. The unit provides two independent single-channel interfaces that each support one party-line audio channel. Single-channel party-line intercom systems are commonly used in theater, entertainment, and education applications where a simple, reliable, low-cost, and easy to use solution is desired. Analog party-line products from Clear-Com are directly compatible with the Model 45DC. The Dante audio-over-Ethernet media networking technology is used to transport the send and receive audio channels associated with each of the two party-line circuits. Two hybrid circuits with automatic nulling provide excellent audio quality and high return-loss. (These hybrid circuits are sometimes referred to as 2-wire to 4-wire converters.) The Model 45DC is directly compatible with the latest broadcast and audio equipment that uses Dante technology. An Ethernet connection is all that's required to make the Model 45DC part of a sophisticated, networked audio system.

Key Features

• Dante audio-over-Ethernet technology
• Integrated party-line intercom power sources
• Analog hybrids with auto null capability
• Input and output level metering
• Excellent audio quality
• PoE and 12 Vdc powering
• Standard connectors
• Table-top, portable, or optional rack-mount use

Technical Specifications

Power Sources
Power-over-Ethernet (PoE)
class 3 (medium power) per IEEE 802.3af
External
10 to 18 Vdc, 1.0 amp max @ 12 Vdc
Network Audio Technology
Type
Dante audio-over-Ethernet
Bit Depth
up to 24
Sample Rate
48 kHz
Number of Receiver (Input) Channels
2
Number of Transmitter (Output) Channels
2
Dante Audio Flows
4; 2 receiver, 2 transmitter
Analog to Digital Equivalence
a +4 dBu input with 0 dB gain selected results in a Dante digital output level of -20 dBFS
Network Interface
Type
twisted-pair Ethernet, Power-over-Ethernet (PoE) supported
Data Rate
100 Mb/s (10 Mb/s Ethernet not supported)
Frequency Response (PL to Dante)
-0.3 dB @ 100 Hz (-4.8 dB @ 20 Hz), -2 dB @ 8 kHz (-2.6 dB @ 10 kHz)
Frequency Response (Dante to PL)
-3.3 dB @ 100 Hz (-19 dB @ 20 Hz), -3.9 dB @ 8 kHz (-5.8 dB @ 10 kHz)
Distortion (THD+N)
<0.01%, measured at 1 kHz, Dante input to PL interface pin 3
Signal-to-Noise Ratio
>73 dB, A-weighted, measured at 1 kHz, Dante input to PL interface pin 3
Party-Line (PL) Intercom Interface: 2
Type
single-channel PL (pin 1 common; pin 2 DC; pin 3 unbalanced analog audio)
Compatibility
single-channel PL intercom systems such as those offered by Clear-Com
Power Source, Pin 2
28 Vdc, 150 mA maximum
Impedance, pin 3 - Local Power Not Enabled
>10 k ohms
Impedance, pin 3 - Local Power Enabled
200 ohms
Analog Audio Level
-14 dBu, nominal, +7 dBu maximum
Call Light Signal Support
DC voltage on pin 3; detect @ 5 Vdc nominal; generate @ 16 Vdc nominal
Mic Kill Signal Support - Local Power Enabled
momentary break in DC voltage on pin 2
Party-Line Hybrids: 2
Topology
3-section analog circuitry compensates for resistive, inductive, and capacitive loads
Nulling Method
automatic upon user initiation, processor implements digital control of analog circuitry; settings stored in non-volatile memory
Nulling Line Impedance Range
120 to 350 ohms
Nulling Cable Length Range
0 to 3500 feet
Trans-Hybrid Loss
>55 dB, typical at 800 Hz
Meters: 4
Function
displays level of audio input and output channels
Type
5-segment LED, modified VU ballistics
Connectors
Party-Line (PL) Intercom
two 3-pin male XLR
Ethernet
Neutrik etherCON RJ45
External DC
4-pin male XLR
USB
type A receptacle
Dimensions
8.7 inches wide (22.1 cm)
1.72 inches high (4.4 cm)
8.3 inches deep (21.1 cm)
Weight
1.7 pounds (0.77 kg); rack-mount front panels add 0.2 pounds (0.09 kg)