PDU sequencing

[Tokead]

I have 3 PDU's set up, and I'm looking for feedback on the timing I have set up for devices to turn on, especially the C4 devices. I find that after a power outage my C4 amp wont distribute music, and I need to reboot it. I've tried to leave a decent gap for the modem and router to boot up. Thanks 

Room	Time (seconds)	Devices
Rec Room	0	Denon AVR, Shaw, etc
	90	EA1
Family Room
	0	Fan
	86	Roku
	85	C4 Amp
	80	Anthem AVR
	85	Shaw
	90	EA1
Rack
	15	Suite Router
	66	Synology DS220
	65	Synology DS218
	90	EA5
	45	Pakedge Switch
	45	Araknis Switch
	30	Araknis Router
	1	Modem

[South Africa C4 user]

This is an interesting question.  I’ve had similar problems (which change from OS version to OS version and / or as my system has become larger / more complex / slower to load.

Ive had problems with needing to time turning on secondary controllers, my matrix and amps.

[macosr]

I agree that this is an interesting question. I am curious if there is anything official from C4 regarding best practices. I have so many devices spread across so many PDUs. I would love to hear what others have done in regards to timing.

[Popolou]

It's best not to look at it in too granular detail. It used to be the case that electronics were usable the moment they powered up but with most devices now being driven by an underlying OS, even if they are turned on and they begin to respond to service requests, there is a lot going on behind the scenes consuming CPU cycles. I'd only consider a system to be ready once CPU activity levels off in what would be close to its idle. Unless there was a hard reboot or a powerdown that causes one, this tends to be around 5mins.

[macosr]

That is mostly the approach I have taken to this up to this point. All devices should be able to gracefully start communicating with other devices as they become available. And, this has been my experience up to this point especially with the current OS.

[RAV]

The only delay I've seen imperative is the modem before router before network.
Allowing for the Internet to be ready for the router, and then switches and after having a ready router as they come back online.

[Cyknight]

Modem. Some ISP modems can take a long time to get connected on the internet side (I've sen minutes for some fibre optic pieces) but 20 delay should be fine on the other end.

Router. Give it 20s before the next step

Mains switch give it 10s before next step

Any other switches off of main switch give it 10s

Main controller give it 30s if pre CORE (or CA10) otherwise 10s is fine

Other Stuff EXCEPT THE OLDER C4 AMPS&MATRICES can all come on at the same time.

The Older C4 matrices and amps are notorious for being slow to (re!) search for DHCP server if not found, but they start up themselves really fast. I would put those on an at LEAST  2 minute delay after the switch it's connected to starts.

Put differently in delay order:

0s Modem (if a fibre optic two-part setup, do second/actual modem piece 5s later)

20s Router

40s Main Switch

50s Other network switches

60s Main controller

70(90 if older controller)s Everything else EXCEPT below

170s Older C4 amps/matrices

 

Fan could go in OP situation at 0 of course, then again, could just be with the rest of the stuff.

 

Obviously delayed startup isn't a MUST, most everything will connect eventually anyway, but it is best practice to have a delayed startup.

[Tokead]

Modem. Some ISP modems can take a long time to get connected on the internet side (I've sen minutes for some fibre optic pieces) but 20 delay should be fine on the other end.
Router. Give it 20s before the next step
Mains switch give it 10s before next step
Any other switches off of main switch give it 10s
Main controller give it 30s if pre CORE (or CA10) otherwise 10s is fine
Other Stuff EXCEPT THE OLDER C4 AMPS&MATRICES can all come on at the same time.
The Older C4 matrices and amps are notorious for being slow to (re!) search for DHCP server if not found, but they start up themselves really fast. I would put those on an at LEAST  2 minute delay after the switch it's connected to starts.
Put differently in delay order:
0s Modem (if a fibre optic two-part setup, do second/actual modem piece 5s later)
20s Router
40s Main Switch
50s Other network switches
60s Main controller
70(90 if older controller)s Everything else EXCEPT below
170s Older C4 amps/matrices
 
Fan could go in OP situation at 0 of course, then again, could just be with the rest of the stuff.
 
Obviously delayed startup isn't a MUST, most everything will connect eventually anyway, but it is best practice to have a delayed startup.

Thanks very much, especially about the older C4 amp’s, which it is


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