IP addresses and octets

Valid IP addresses consist of four 1-, 2-, or 3-digit numeric sub-fields, called “octets,” which are separated by dots (periods) (figure 35, below). Each octet can be numbered from 000 through 255. Leading zeros, up to 3 digits total per octet, are optional. Values of 256 and above are invalid.

Typical IP Address: 192.168.254.254

Octets

Figure 35. IP Address and Octets

Subnet masks and octets

The subnet mask (figure 36, below) 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 zeros, up to 3 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.

0indicates that this octet will not be compared between two IP addresses.

255indicates that this octet will be compared between two IP addresses.

Typical Subnet Mask: 255.255.0.0

Octets

Figure 36. Subnet Mask and Octets

Determining whether devices are on the same subnet

To determine the subnet, the local device IP address is compared to the remote device IP address (see figure 37, below). The octets of each address are compared or not, depending on the value in the related subnet mask octet.

•If a subnet mask octet contains the value 255, the related octets of the local device address and the remote device IP address are unmasked.

Unmasked octets are compared (indicated by ? in figure 37).

•If the subnet mask octet contains the value 0, the related octets of the local device and remote device IP addresses are masked.

Masked octets are not compared (indicated by X in figure 37).

If the unmasked octets of the two IP addresses match (indicated by = in example 1 of the figure below), the two addresses are on the same subnet.

If the two unmasked fields do not match (indicated by an unequal sign in the figure below, examples 2 and 3), the addresses are not on the same subnet.

 

 

 

 

Example 1

 

Example 2

Example 3

 

Local IP Address:

192.168.254.254

 

192.168.254.254

 

192.168.254.254

 

 

Subnet Mask:

 

255.255.0.0 (?.?.X.X)

 

255.255.0.0 (?.?.X.X)

255.255.0.0 (?.?.X.X)

 

Remote IP Address:

192.168.2.25

 

190.190.2.25

 

192.190.2.25

 

 

 

 

 

 

Match

 

 

 

 

 

 

Match?:

 

= . = .X.X —

≠ . ≠ .X.X — No match

= . ≠ .X.X — No match

 

 

 

(Same subnet)

(Different subnet)

(Different subnet)

 

 

 

 

 

 

 

 

 

 

 

Figure 37. Comparing the IP Addresses

QGE 100 • Reference Information

52

Page 57 Page 59
Page 58
Image 58
Extron electronic QGE 100 manual IP addresses and octets, Subnet masks and octets
Page 57 Page 59

QGE 100 specifications

The Extron QGE 100 is a high-performance network switch engineered specifically for AV system integration. With its advanced capabilities, this device plays a crucial role in managing AV data traffic, ensuring reliable performance and efficiency in various settings such as corporate environments, educational institutions, and healthcare facilities.

One of the key features of the QGE 100 is its support for Power over Ethernet (PoE). This allows the switch to deliver both data and power to connected devices over a single Ethernet cable, simplifying installations and reducing the need for additional power sources. This is particularly beneficial for devices like IP cameras, wireless access points, and AV devices in scenarios where accessibility to power outlets may be limited.

The QGE 100 also provides a robust Layer 2 switching functionality, which is essential for managing data flow within the network. Its capability to handle multiple VLANs ensures that AV traffic can be segregated effectively, thus improving network performance and security. The switch features IGMP Snooping, a protocol that optimizes multicast traffic management, ensuring that video streams reach the intended recipients without unnecessary bandwidth consumption.

In terms of connectivity, the Extron QGE 100 is equipped with multiple Gigabit Ethernet ports, facilitating high-speed data transmission for AV content. The switch's user-friendly management interface allows for straightforward configuration, monitoring, and troubleshooting, streamlining operations across AV environments. Additionally, it supports link aggregation, enhancing bandwidth and redundancy when connecting multiple devices.

The QGE 100 is also designed with reliability in mind, featuring a fanless operation that minimizes noise and ensures a long lifespan. Its compact form factor allows for easy rack mounting in equipment racks, maintaining a clean and organized setup.

Another vital characteristic of the QGE 100 is its compatibility with Extron's comprehensive suite of AV control and management products. This integration capability provides users with a cohesive solution for managing their AV systems, further enhancing the overall user experience.

In conclusion, the Extron QGE 100 network switch is an essential tool for any AV system requiring efficient connectivity, power delivery, and data management. Its sophisticated features and technologies make it a valuable asset in modern AV installations, ensuring robust performance and ease of use.
Top Page Image Contents