Audio-over-IP (Dante)
Pick channels, sample rate (48/96/192 kHz) and bit depth and I compute the raw audio bandwidth and the network estimate (with RTP/IP overhead), packets per second and the Dante latency.
1 GbE link usage
Network estimate against a Gigabit Ethernet link (1000 Mbps).
Bandwidth by channels
| Channels | Raw | Network | % of 1 GbE |
|---|
current setup · at the chosen sample rate and bit depth.
How it is calculated · audio over IP
1. Raw audio bandwidth
(PCM samples only):
BW = channels × Fs × bits, with Fs in Hz.
E.g. 1 × 48000 × 24 = 1.152 Mbps per channel at
48 kHz/24 bit.
2. Network bandwidth:
we multiply the raw figure by an overhead factor
(×1.3 by default) that approximates the
RTP 12 + UDP 8 + IP 20
+ Ethernet headers. The real value depends on packing
(samples per packet): more latency means more samples per packet and
lower relative overhead.
3. Packets per second per
flow: pps = 1000 / latency_ms. At 1 ms that
is 1000 packets/s; at 0.25 ms, 4000.
4. Samples per packet (per
channel): Fs × latency_ms / 1000. At 48 kHz and
1 ms that is 48 samples.
5. This is an estimate for sizing the network. Dante and AES67 pack each flow somewhat differently and add control traffic (mDNS, PTP for clock sync). The fixed per-packet overhead weighs more with few samples per packet (low latencies) and few channels per flow.
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