M4250 A&H DX port profile

SwanJovi wrote:

The guidance from A&H stipulates that the connection has to be set by the switch to be 100mpbs as their testing showed that it wasn't reliable when left to auto negotiate.

Interesting. Considering the A&H GigaAce is a Gigabit capable device (nomen est omen...). Have some references where this note is coming from exactly? 

In the A&H Recommended Cables Guide they are mentioning for transporting audio between two nodes:

"dSnake, ME, ACE and DX links use 100BaseT Fast Ethernet, with 99.7% of bandwidth use. gigaACE uses 1000BaseT Gigabit Ethernet, with 93% bandwidth use. S-link ports auto negotiate protocol and link speed, switching to dSnake, ME, DX or gigACE mode depending on the connected device."

In my understanding, they are talking here of two adjacent nodes, directly connected. The negotiation applies to both the pure Ethernet PHY link as well as the effective transport over TCP or UDP. This is the "typical" definition from the earlier days of deploying AV networks. Can't get this myth away from the heads of some of my friends, that eg. Dante must be operated on a dedicated Fast Ethernet. 

Where one dos deploy multiple DX devices on a switch (for carrying more concurrent audio channels), this "advice" does not make much sense to me, especially where more and different audio channels are sent to the GigaAce interface(s).