| POWER |
| DC Power Input on APB |
+12VDC 1.2A maximum
Use only the provided AudioFetch AC power adapter |
| AC Power Adapter (provided) |
AC Input: 100-240V, 50-60 Hz, .36A
DC Output: 12V, 1.5A |
| AUDIO INPUTS |
| Digital Optical Input |
S/PDIF signal format over fiber-optic TOSLINK cable
Encoding: Uncompressed PCM, interleaved stereo
Sample Rates supported: 48KHz |
| Digital Coax Input |
S/PDIF signal format over coaxial cable
Input Signal Level: 0.55 Volts P-P typical
Input Impedance: 75 Ω
Encoding: Uncompressed PCM, interleaved stereo
Sample Rates supported: 48KHz |
| Analog Input |
L/R Stereo Channels into stereo 3.5mm connector, AC-coupled in APB
Input Signal Level: 2.4 Volts P-P maximum
Input Impedance: 12 KΩ typical |
| Audio Gain Adjustment range |
+20 to -100 dB in 0.5 dB steps
Independent adjustment for each channel available through web based configuration pages (applies to Digital and Analog inputs) |
| AUDIO STREAMING |
| Simultaneous connected users (audio-streams) on each APB |
250 maximum |
System Latency
(time delay between audio input on AudioFetch and headphone output on mobile device) |
1 user: 115ms typical
250 users: 120ms typical
These are based on minimal delays in the network/WiFi and thus represent sum of latencies in AudioFetch, the AudioFetch App, and mobile device Operating System only. Network, WiFi, and mobile device performance can affect latency. Some Android devices have greater latency. |
| NETWORK INTERFACE |
| Ethernet Port |
100Base-TX, half/full duplex, auto-negotiated
HP Auto MDI/MDI-X configuration (works with either straight-through or crossover cables) |
| IP Address |
Auto configured via DHCP (default) Can be set to static IP address (using included configuration manager web portal or App (Doghouse)) |
| NETWORK PROTOCOLS AND PORTS |
| IP version support |
IPv4 |
| Streaming traffic for audio channels |
Other than occasional control packets, each audio stream consists of UDP unicast packets outgoing from the APB |
| NETWORK BANDWIDTH |
| Bandwidth consumed by each audio stream (Stereo APBs) |
50 UDP packets per second approximately 201 bytes each (includes the IP header but not physical layer header) Therefore, UDP (+ IP header) bandwidth is approximately 10,050 bytes/sec for each audio stream Discovery and keep-alive control traffic is negligible compared to this |
| Bandwidth consumed by each audio stream (MONO APBs) |
50 UDP packets per second approximately 121 bytes each (includes the IP header but not physical layer header)
Therefore, UDP (+ IP header) bandwidth is approximately 6,050 bytes/sec for each audio stream
Discovery and keep-alive control traffic is negligible |
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