APPENDIX

There are two basic concepts that are needed for a basic understanding of networking, IP addresses and subnet masks. IP addresses are 32-bit binary numbers that have two corresponding parts or sub-addresses, the first part identifying the network and the second part identifying the hosts on the network. An imaginary boundary separates the first part from the second. This imaginary boundary is marked by way of the subnet mask. The subnet mask is another 32-bit binary number the acts like a filter on the IP address. When a subnet mask has a bit set to 1, the corresponding bit in the IP address is part of the network address. A subnet is classified as either a class A, class B, or class C network. The following table shows the common subnet mask classes:

Class

Network Portion

Host Portion

 

 

 

A

11111111

00000000 00000000 00000000

 

 

 

B

11111111 11111111

00000000 00000000

 

 

 

C

11111111 11111111 11111111

00000000

 

 

 

For example, if you have an IP address of 169.254.1.1 and a subnet mask of 255.255.0.0, then the first 16-bits of the 32-bit IP address identify the network.

10101001 11111110 00000001 00000001

IP address

11111111 11111111 00000000 00000000

Subnet Mask

There are 216 (65,536) addressable hosts in this example and 169.254 is the network. There is one last piece of information that is needed here. Subnet masks are not shipped around in the IP packet, the packet only contains the 32-bit IP address of the destination. So without this valuable piece of information devices have no idea what portion of the IP address is part of the network and which is part of the host address. How does data know where it is supposed to go? IP systems developed a unique form of logic to make this determination. Class A network addresses always have the first bit of their IP address set to 0. Class B network addresses always have their first bit set to 1 and their second bit set to 0. Class C network addresses always have their first two bits set to 1 and the third bit set to 0. By examining these first bits of the IP address a device can determine what subnet mask should be applied to the IP address and determine where to route the data.

The following is a synopsis of an Internet Draft (http://www.ietf.org/internet-drafts/draft-ietf-zeroconf-ipv4-linklocal-05.txt) that describes how Microsoft and Apple operating systems react when a DHCP server is not found on the network. In general, a computer needs certain configuration information to operate on a network. Those configurations are an IP address, a subnet mask, and possibly a gateway address. A DHCP server will automatically assign this configuration information to a computer on a network or an operator is required to manually input these configurable items. When a computer is brought online and a DHCP server is not accessible (i.e. server is down or the computer is not plugged into the network) Microsoft and Apple operating systems will default to an IP address and subnet mask of 169.254.x.x and 255.255.0.0 (169.254/16).

Page 32 Page 34
Page 33
Image 33
Motorola SM02-UG-en user manual Appendix, Class Network Portion Host Portion
Page 32 Page 34

SM02-UG-en specifications

The Motorola SM02-UG-en is an innovative and versatile device designed to enhance communication and connectivity in various professional environments. With a primary focus on providing reliable audio quality, this product is particularly valuable for businesses that depend on clear and efficient communication.

One of the standout features of the SM02-UG-en is its advanced audio technology. The device utilizes high-definition audio processing, ensuring that conversations are crystal clear with minimal distortion. This feature is essential for environments where precise communication is crucial, such as in emergency services, public safety, and corporate settings. The clarity offered by the SM02-UG-en significantly reduces the likelihood of miscommunication, enhancing overall operational efficiency.

In terms of connectivity, the SM02-UG-en supports multiple pairing options, allowing users to connect with various devices seamlessly. This flexibility means that users can easily connect to smartphones, tablets, and other communication tools, ensuring they remain connected to their team at all times. The device’s Bluetooth capabilities provide a stable and robust connection, minimizing dropouts even in crowded environments.

The SM02-UG-en is designed with user comfort and convenience in mind. Its lightweight and ergonomic design make it suitable for extended use, reducing fatigue during long shifts or meetings. The adjustable microphone ensures that users can position it optimally for their needs, further enhancing audio quality.

Moreover, the device features an impressive battery life, allowing for prolonged use without the need for frequent recharging. This quality is particularly advantageous for professionals who are on the move, as it eliminates the worry of running out of power during critical moments.

Another notable characteristic of the SM02-UG-en is its durability. Built with robust materials, the device is designed to withstand the rigors of daily use in demanding environments. This durability ensures longevity, making it a worthwhile investment for organizations.

In conclusion, the Motorola SM02-UG-en stands out as a reliable choice for professionals seeking high-quality audio communication solutions. With its advanced audio technology, versatile connectivity options, user-friendly design, and durability, it addresses the needs of contemporary communication demands across various sectors. Whether in a corporate office or an emergency response scenario, the SM02-UG-en is engineered to deliver exceptional performance and clarity.
Top Page Image Contents