AV-over-IP Switches: Match the Media Path, Clocking and Power

The codec defines the port requirement

Start with the actual transmitter and receiver modes, including simultaneous streams and control traffic. A network carrying compressed video to a few displays has a different demand from one distributing many high-rate streams between rooms. The switch must support the endpoint link speed, but the uplink must carry the combined traffic that crosses it. Counting installed displays alone does not reveal that load.

Map each stream from its source to every required destination. Multicast can avoid sending a separate source copy for each receiver on a shared path, but replication occurs wherever the paths branch. An uplink carrying several distinct sources still carries their combined rate. A link aggregation group also does not guarantee that one flow can use the sum of all member speeds.

Four NETGEAR examples cover different roles

The M4250 GSM4212PX offers eight powered Gigabit access ports, two additional unpowered Gigabit ports, two 10GbE uplinks and a 240W PoE budget. It is a useful room-edge candidate when the codecs fit Gigabit links. Its AV-oriented interface and physical layout address installer workflow, but protocol support and any required license still need to match the selected endpoints.

The M4300 XSM4348S provides 24 copper 10GbE and 24 independent 10GbE SFP+ interfaces, without PoE. It suits externally powered equipment and mixed copper/fiber aggregation. M4350 XSM4328CV instead supplies 24 multigigabit copper ports through 10GbE with 30W PoE+ and four 25GbE uplinks. Its base PoE budget is 576W; a supported expanded power configuration reaches 720W, while the manufacturer lists 576W for the redundant power budget. A 60W endpoint requirement is not satisfied by choosing this 30W-per-port model.

For an optical distribution role, M4500 XSM4556 has 48 10/25GbE SFP28 ports and eight 100GbE QSFP28 ports. Its larger fan-cooled chassis belongs in a suitable rack environment. Moving to that tier increases fabric connectivity; it does not make the access switches, receivers or room cabling operate faster.

Separate multicast control from clock protection

Audinate's current guidance recommends disabling Energy Efficient Ethernet on Dante traffic ports and configuring suitable QoS, with particular importance when 100Mbps devices are present or other services share the network. Protecting clock traffic is a different job from keeping unwanted video off a receiver's port. A switch can have correct multicast memberships and still mishandle traffic priority.

IGMP snooping is especially useful with substantial multicast traffic; it is not mandatory for every small Dante audio network. Where it is used, verify a correctly elected querier per VLAN and compatible IGMP behavior. Audinate's current support guidance explicitly accommodates v2 and v3 devices. Check the actual receiver memberships and querier election after a topology change rather than assuming that enabling snooping completes the configuration.

Presets reduce setup work, not engineering responsibility

A hands-on M4250 review found its AV-focused configuration useful. Operator reports across larger M4350 and M4500 deployments, however, include difficult spanning-tree and topology-change investigations. Those reports involve particular mixed installations, not a controlled comparison of every model. Their practical lesson is to keep enough visibility to distinguish endpoint overload, multicast distribution, timing loss and topology churn.

Document which team owns each VLAN, querier, uplink and firmware change. An AV profile that works in a self-contained room may interact differently with campus multicast routing or an upstream security policy. Protocol names are not interchangeable: a Dante deployment, an AVB deployment and an IP-video distribution system can require different timing, licensing and forwarding behavior.

Accept the full event sequence

Test the heaviest intended simultaneous program, then change receiver subscriptions, restart a transmitter and interrupt the redundant path the design claims to survive. Observe link errors, queue drops, membership recovery and audible or visible interruption. Repeat after the agreed firmware version is installed. Save the working configuration together with the endpoint modes so a future replacement reproduces the system rather than merely the switch settings.

Our recommendation is to buy from the media path outward. Use a compact Gigabit AV switch where the streams fit, faster powered access where endpoint rates demand it, and optical aggregation where inter-room traffic justifies it. Reserve money and time for commissioning; an oversized chassis cannot repair an untested clocking or multicast design.