Low Voltage Warning - Peavey MediaMatrix Nion Hardware Manual

Appendix A - Troubleshooting

Use switches that allow port based bandwidth throttling or data storm control. The
configuration of a throttling feature will be switch vendor specific. Configure each port
directly connected to a CobraNet device to limit the amount of traffic allowed to go from
the port to the CobraNet device.

Data storm control often consists of severely limiting or stopping multicast data. Be
sure that this feature is not configured to prevent the passage of normally occurring
multicast CobraNet data which includes beat packets, reservation packets and
multicast bundles.

A good rule is to limit traffic going to a CobraNet device to 50 megabits. Less traffic
may be acceptable and safe depending on the number of bundles and channels received
by a device. More than 50 Mbit of bandwidth will seldom be required when using
CM-1 modules.

The specific bandwidth to allow should be the amount of received data plus
approximately 10 to 15 megabits

A CM-1, when fully configured to receive 32 channels of 48 kHz sample rate audio
data at standard latency, will receive approximately 32 Mbit of audio data + beat
packets + SNMP + serial or packet bridge. The additional 10~15 Mbit is intended to
accommodate data other than audio bundles.

Additional requirements for bandwidth will be created by the use of:
Lower latencies – approx +10% per decrease in latency
96 kHz sample rate - doubles the required bandwidth per channel
Packet bridge – use dependant
Serial bridge – use dependant
SNMP – use dependant.
Best practices

Explicitly set the CobraNet Conductor priority and XDAB master priority in all devices to
insure they are set correctly.

Locate the CobraNet Conductor outside an XDAB cluster when possible.

Set all Conductor priorities to 0 in all devices except those that should be allowed to be
Conductors. For those devices that should be Conductors, make their priorities the same.

Devices with CM-1 modules are preferred as Conductors over devices that have CM-2
modules.

Low voltage warning

When using phantom power for high current draw condenser mics on NIONs, and when all
four I/O slots are populated with ML II cards, the +/-24V power voltage may drop a little. This
is because on some NIONs, the 24V power supply current limit is slightly low. This voltage
drop is sometimes sufficient to trigger the voltage warning: the Attn button on the front of the
NION will flash red, and pressing it will bring up the voltage monitoring screen, with the
+/-24V measurements highlighted.
Under most conditions, the voltage drop will not have any effect on the functioning of the
NION, because the full 24V is actually substantially more than the cards require. The 24V
supplies feed local regulators on the cards which generate a substantially lower voltage for the
analogue i/o circuits - this decouples the analogue circuitry from variations in the 24V supply.
The problem can be worked around by using less power hungry microphones or by removing
one of the ML II cards from the unit. If you cannot do this, contact your local NION service
agent.
70 Version 1.6.4b.1 June 11, 2012