Crestron DigitalMedia DM-MD128X128, Руководство по эксплуатации и установке

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DigitalMedia Switchers Crestron DM-MD64X64/DM-MD128X128
26 • DigitalMedia Switchers: DM-MD64X64/DM-MD128X128 Operations & Installation Guide – DOC. 7318D
For information specifically related to Ethernet connectivity using DigitalMedia
devices, refer to the Crestron IP Considerations Guide for the IT Professional
(Doc. 4579) at www.crestron.com/dmresources.
Ethernet Setup
The DM switcher can operate in DHCP or Static IP Address mode. When DHCP is
enabled, the IP address is set dynamically. When DHCP is disabled, the IP address is
set manually.
A fully loaded DM-MD64X64 and DM-MD128X128 can contain up to 145 and 289
Ethernet-enabled devices, respectively, with each device requiring its own IP
address. As a result, the DM switchers always operate in Private Network Mode
(PNM) to control the Ethernet settings of DM endpoints (transmitters and receivers).
PNM allows only the DM switchers to require an IP address from the public
network, thereby reducing the amount of IP configuration necessary and allowing the
DM endpoints to be swappable without reconfiguration. In a DM system containing
a single DM switcher, the DM switcher is the only DM device that consumes an IP
address. All DM I/O blades and DM endpoints that are connected to the DM
switcher are hidden from the public network and cannot be reached directly; instead,
all communication is managed through the DM switcher. As a result, PNM creates a
completely private IP network for all DM blades and endpoints.
NOTE: When connected to a DM switcher, a DM endpoint must not have its
convenience Ethernet port connected to the LAN. A DM endpoint receives its
network connection via the DM switcher. The convenience Ethernet port of a DM
endpoint is available for connection to a network device such as a PC, Blu-ray
player, or TV.
For installation in a corporate or university setting, PNM does not heavily impact the
network. Ethernet ports on DM endpoints remain visible to the public network. PNM
also prevents RSTP (Rapid Spanning Tree Protocol) traffic from reaching the public
network.
When multiple DM switchers are cascaded, a unique system ID must be assigned to
each switcher. The system ID of each switcher determines the internal IP address to
be used by each device in the DM system. The system ID can be set using the front
panel touch screen or from a web browser.
With PNM always enabled, a VLAN (virtual LAN) is not used to separate public and
private Ethernet traffic. Instead, two physically separate Ethernet ports divide public
traffic from private traffic. The main CPU is the only device connected to both
networks. The CPU may receive an instruction from a device on the public network,
such as a Crestron control system, and may then create a new instruction for a
private device such as a DM blade or endpoint. Ethernet packets from the public
network, however, can never traverse the private network. Similarly, Ethernet
packets from the private network can never traverse the public network.