showstack / glossary / multicast
Multicast 多播
Sending one copy of a stream to a group address that many receivers can subscribe to, instead of one copy per receiver. How sACN, Dante, AES67 and ST 2110 scale past a handful of devices.
中文
把一份串流送到群組位址，由多個接收端訂閱，而不是為每個接收端各送一份。sACN、Dante、AES67 與 ST 2110 能擴展到大量設備，靠的就是這個機制。
Regional usage
| Where | Term | Note |
|---|---|---|
| UK / US | Multicast | |
| HK | 多播 / Multicast | |
| TW | 群播 |
Easy to get wrong
Without IGMP snooping a switch treats multicast as broadcast and floods every port. That is why a small DMX-over-IP network works fine and a big one falls over on the same gear.
Next to this
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Where it shows up on the wire
sACNCarries DMX512 data over standard IP networks as multicast UDP, one multicast group per universe. It is the v…DanteAudinate's proprietary audio-over-IP system carrying uncompressed multichannel audio, clocking and device con…AES67An AES interoperability standard for streaming uncompressed audio over IP using RTP and IEEE 1588 PTP. It is …SMPTE ST 2110A suite of SMPTE standards for carrying uncompressed video, audio and ancillary data as separate RTP streams …
Sources
- ANSI E1.31 (sACN) multicast addressing — ESTA TSP primary
Understand the mechanism
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