C3500 Audio Sync Lock error

dLive dLive Troubleshooting
1

hello,

I’m trying to connect my C3500 to my mixrack trough 2 Network switches with a Fibertrunk.
everything seems to be working Ok, except the surface shows “Audio Sync Lock” is missing.

i seem to have full control over the mixrack, nog lag or anything. audio also seems to work without problems. no audible clicks, distortion or anything like that. even on a higher channel count (about 60 simultaneous) no problems are showing.

the strange thing is, if i replace the fibertrunk with a Copper one, the “Audio Sync Lock” is fine.

is there anyone who has experienced this problem, and knows how to fix it ?
OR does anyone know what could happen if i keep it without the “Audio Sync Lock” ?
every bit of advise is welcome.

i’m using:
C3500
2x TP Link Jetstream T1700G 28TQ
2x TP Link TXM431-SR SFP+ Module’s
CDM64

2

My 1st question is why are you having to route your mix rack link thru switches. Not recommended.

3

it’s because i want to run it over a fiber connection alongside a few other network connections (speaker management etc.) and it’s way more cost effective than the FiberACE option. so it allows me to run a single fiber to the FOH instead of 2 separate fibers.

it’s something that should be perfectly fine according to this documentation.
https://support.allen-heath.com/index.php?/Knowledgebase/Article/View/1152

so it might not be specifically recommended, it’s also not specifically NOT recommended. if that makes any sense :wink:

4

Luuk, have you read this thread, some detailed info, may or may not help.
https://community.allen-heath.com/forums/topic/console-to-mixrack-through-a-switch

5

Yes i’ve read that one.

I actually used that thread to get it working as far as i have :wink:

But thanks anyway

6

I’m not familiar with how clocking is handled in gigaACE. Do we know if it uses PTP or PTPv2?
How about multicast? IGMP snooping?