Crestron DM NVX Series Design Guide

20 • DM NVX System Design Guide – DOC. 7977F
Daisy Chain Network Configuration for 12-Person Jury Box
Due to limited bandwidth for audio and video, a USB host or device on a daisy chained
endpoint is not recommended. For maximum flexibility and the ability to reconfigure
video walls with multiple sources, connect DM NVX endpoints directly to switches rather
than daisy chain the endpoints.
Other Topologies and Network Functionality
Other valid deployment topologies for DM NVX networks are ring and mesh. These
deployments require project-specific discovery and configuration of the network switch.
For projects using advanced topologies for deployments, a networking professional must
be involved early in the network design process.
Network Multicast Functionality
DM NVX networks rely on multicast functionality to send and receive video—even in the
simplest case of a single encoder endpoint and a single decoder endpoint. Internet Group
Management Protocol (IGMP) multicast in the Ethernet context replaces a fixed
switching architecture in AV distribution.
Segregation of DM NVX traffic by using a VLAN or MPLS is usually the first step in
enabling multicast. A VLAN or MPLS ensures that DM NVX traffic stays on the DM NVX
network and does not route to other network segments and interfere with their
operation. A VLAN or MPLS also ensures that traffic from other network segments does
not interfere with DM NVX operation. Within that segment, all ports can be flooded by
IGMP traffic regardless of whether that traffic was intended to be sent or received by a
network device at any time. This will result in interference with network operation and
can be a means of implementing a denial-of-service attack on a network if done
maliciously.
To ensure that only traffic between intended multicast senders and multicast receivers
appears at a given port, IGMP snooping must be enabled. IGMP snooping refers to the
ability of the network switch to limit multicast traffic only to ports between intended
senders and receivers. The DM NVX network supports both versions of IGMP snooping:
IGMPv2 and IGMPv3.
Display
HDMI
DM NVX
DM NVX
Laptop
LAN
HDMI
Display
DM NVX
LAN
HDMI
LAN
LAN
Display
DM NVX
DM NVX
LAN
DM NVX
LAN
DM NVX
LAN
HDMI
Display
HDMI
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HDMI
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HDMI
Network switch
DM-XIO-DIR-160

Crestron DM NVX Series Specifications

General

Latency	<1 Frame
Dimensions	Varies by model
Weight	Varies by model
Video Input	HDMI
Video Output	HDMI
Audio Formats	PCM, Dolby Digital, DTS
Audio Inputs	HDMI, Analog
Audio Outputs	HDMI, Analog
Control	Crestron Control System
HDCP	HDCP 2.2
Security	AES encryption