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Ethernet/Cresnet Interface Crestron CEN-CN
24 •• Glossary of Terms Operations Guide - DOC. 5721
IP ID
The IP ID is a two-digit hexadecimal number that is used to differentiate a given
device from a group of Ethernet devices in a control system with the same IP
address. Just as the Net ID is used to distinguish between identical devices within a
SIMPL Windows program, the IP address for a specific IP ID in the control system’s
IP table must be set to the IP address of the given device. Furthermore, the IP ID in
the given device’s static master table must be set to the IP address of the control
system.
IP Mask
An IP mask is a pattern of bits in IP address format (e.g. 255.255.255.0) which, when
"and"ed with your IP address, produces a network address. If an outgoing packet's
network address has the same network address as the source of the packet, it is sent
on the local network wire, to be received by a device on that local network.
Otherwise, it is sent to the gateway, to be routed to a device existing on another
network. The IP mask for any device should be assigned by whoever manages the
local network. An IP mask is also referred to as a Subnet Mask.
IP MTU
IP MTU is the maximum packet size that the device can transmit. It is not necessary
to change this value from 1500 for an all Ethernet network.
IP Table
An IP table lists IP IDs and their corresponding IP addresses. This table is
maintained inside each CNX control system, though it may be generated by a SIMPL
Windows program, or edited manually using the Viewport utility.
MAC Address
MAC address is a unique hardware address assigned to every network device in use.
The MAC address is assigned by Crestron at the factory and is never changed.
MASTER LIST
Master list is a list of Crestron Internet Protocol (CIP) enabled devices that will be
informed of any changes in the state of the controlled device. The device accepts
commands from the addresses of these masters.
Network Address
A network address is a pattern of bits in IP address format that is shared by all
network devices on a given local network. For example, network address
192.168.2.0 describes the local network where all devices have an IP address of
192.168.2.x, where x is any value from 1 to 254.
NMS TRAP CATCHER
NMS trap catcher is the address of a SNMP monitoring station that sends any alarm
messages that the monitored device wishes to send.
Router
Router is a communications device that routes data between networks.
Subnet Mask
See IP mask above.