QSC unD4I-L handleiding
Handleiding
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Attero Tech by QSC unD4I-L
User Manual
QSC, LLC 2020 614-00025
2.2 – Daisy Chaining and Power Linking
A unique feature of the unD4I-L is the ability to allow daisy chaining of devices. This allows units in close proximity to
one another (or other devices that support daisy chaining and power linking) to utilize a single home run o f Ethernet
cable back to the switch thus saving on installation costs. Daisy chaining simply requires the new device be connected to
the spare Ethernet port of the last device in the chain. Not only can the Ethernet connection be daisy chained, power can
also be daisy chained too by connecting the power link power output on the last active device to the power link input on
the new device. This works even if the initial device in the chain is powered by PoE.
The number of devices that can be daisy chained is limited. The maximum that can ever be daisy chained is 6 devices in
a single chain. Beyond that the number of switch hops may cause audio problems due to excessive latency and increased
clock jitter. The other limitation is the power supply if power is also being daisy chained from device to device.
o PoE - If power is supplied to the first device via PoE, the daisy chain limit is restricted to the initial device plus
two others (trying to do more will cause the POE to over current).
o Standalone – If power is supplied to the first device via a standalone supply, the supplies maximum power output
determines the number of devices it can support (assume 4W @ 24V DC per device).
*Note: Take care in estimating the power usage for any unD4I-L that is interfaced to logic devices. The logic outputs are
capable of sinking large amounts of current. The peak power consumption of the unD4I-L when sinking all four logic
outputs at its maximum sink current is ~10W (when the rear panel 24V logic supply is used). In applications where the
unD4I-L is used, it is recommended to use local power supplies and avoid daisy-chaining where possible to simplify the
potential power supply issues.
To daisy chain a device, connect an Ethernet cable from the data only port of the powered unit to one of the ports of the
device to be chained. This supplies the network information only. To chain the power, connect the “Link out” connector
of the powered unit to the “Link in” connector on the device to be chained. If the second unit is another unD4I-L, a third
unit could be chained by connecting it in the same way to the second unit and so on.
Network Configuration Note: If the devices are installed in a networked daisy-chain topology, it is highly recommended
to only configure unicast flows from each of the devices' Dante transmitters in the chain. The addition of multicast flows
along the daisy chain can overwhelm the switches in the chain with unnecessary multicast audio traffic resulting in
potential latency and network clock synchronization issues, especially on the units installed at the end of the daisy-chain
network segment.
Additionally, if there are a significant number multicast audio flows configured on the Dante network, it is recommended
that the core network switches that interface to the daisy-chained network segments be configured with the appropriate
IGMP settings to shield the chain from unnecessary multicast audio traffic. The example shown in Figure 3 highlights how
an IGMP enabled switch can eliminate unnecessary multicast audio traffic from the unD4I-L daisy chain segment. The red
connections show devices that are configured for multicast audio flows and the green are unicast flows and each show
the network segments that are traversed by the associated audio traffic.
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Productinformatie
| Merk | QSC |
| Model | unD4I-L |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 2811 MB |
