Extron-electronics DMS 1600_2000_3200_3600 User Guide User Manual download pdf (Page 119)

DMS 1600, DMS 2000, DMS 3200, and DMS 3600 • Ethernet Connection 113

Subnetting — A Primer

It is not the purpose of this guide to describe TCP/IP protocol in detail. However, some

understanding of TCP/IP subnetting (a subnet is a subset of a network — a set of IP devices

that have portions of their IP addresses in common) is necessary in order to understand

the interaction of the DMS matrix switcher and the mail server gateway. To understand

subnetting at the level required to install and operate the DMS matrix switcher, you must

understand the concepts of a gateway, local and remote devices, IP addresses and octets,

and subnet masks and octets.

Gateways

The DMS matrix switcher can communicate with the e-mail server that the switcher uses

for e-mail notification directly (if they are on the same subnet) or the communication can be

routed via a gateway (a computer that provides a link between different subnets).

Local and Remote Devices

The local and remote devices are defined from the point of view of the function being

described. In this guide, subnetting is an issue when you are using the controlling PC to

set TCP/IP and e-mail values in the matrix switcher (see IP Settings/Options Window on

page 67 and Email Settings Page on page 93). When you are setting up the variables for

e-mail notification, which may include subnetting, the matrix switcher is the local device and

the e-mail server is the remote device.

IP Addresses and Octets

Valid IP addresses consist of four 1-, 2-, or 3-digit numeric subfields, properly called octets,

separated by dots (periods) (see figure 77). Each octet can be numbered from 000 through

255. Leading zeroes, up to three digits total per octet, are optional. Values of 256 and above

are invalid.

192.168.254.254Typical IP Address:

Octets

Figure 77. Typical IP Address

Subnet Masks and Octets

The subnet mask (see figure 78) is used to determine whether the local and remote devices

are on the same subnet or different subnets. The subnet mask consists of four numeric

octets separated by dots. Each octet can be numbered from 000 through 255. Leading

zeroes, up to three digits total per octet, are optional. Each octet typically contains either

255 or 0. The octets determine whether or not the same octets of two IP addresses will be

compared when determining if two devices are on the same subnet.

255.255.0.0Typical Subnet Mask:

Octets

255 indicates that this octet will be

compared between two IP addresses.

0 indicates that this octet will not be

compared between two IP addresses.

Figure 78. Typical Subnet Mask

1 2 ... 114 115 116 117 118 119 120 121

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Extron-electronics DMS 1600_2000_3200_3600 User Guide User Manual Page 119