VLANs

VLANs are used by WLAN networks to provide two distinct functions:

∙Segment traffic into distinct broadcast domains (IP subnets).

∙Create separate security domains for different security models (such as open, WEP, LEAP, Protected Extensible Authentication Protocol (PEAP), EAP Transport Layer Security (EAP/TLS))

The Cisco AVVID design guide states that separate VLANs should be created for voice and data traffic. This allows appropriate QoS to be provided to different classes of traffic as well as addressing issues such as IP addressing, security, and network dimensioning.

Cisco AP350, AP1100, and AP1200 support up to 16 VLANs. Cisco APs can be connected to Cisco Catalyst switches through 802.1q trunks (hybrid mode: native VLAN (Port VLAN ID (PVID)) is not tagged). Each VLAN is then mapped to a unique SSID on the AP. Users (or IP phones) can then be assigned to VLANs based on either static configuration of SSID or dynamically though the use of RADIUS authentication. Each VLAN can use a different security mechanism, although only one can be unencrypted (open). The following is an example of configuring VLANs on VxWorks−based APs (AP350 or AP1200):

The following is an example of configuring VLANs on Cisco IOS Software−based APs (AP1100 or AP1200):

Cisco − Wireless IPT Design Guide for the Cisco 7920 IP Phone

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Cisco Systems 7920 IP manual VLANs
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7920 IP specifications

The Cisco Systems 7920 IP phone represents a significant advancement in wireless communication technology, designed specifically for enterprises that require mobility and efficiency in their communication systems. This versatile device integrates seamlessly into a Cisco IP telephony network, allowing users to maintain connectivity while on the move, which is essential in fast-paced business environments.

One of the key features of the Cisco 7920 is its robust wireless capabilities. Operating on the IEEE 802.11b/g Wi-Fi standards, it provides a reliable connection to corporate networks, ensuring that users can access voice, data, and video services without being tethered to a desk. The phone supports dynamic call handling and features a responsive LCD display that enhances user interaction, making it easier to navigate menus and manage calls.

The Cisco 7920 also offers exceptional sound quality, thanks to its advanced audio technology. With Wideband audio support, users can experience clarity in conversations, which is particularly important in environments where clear communication is vital. The phone is equipped with noise-canceling capabilities that reduce background noise, allowing users to focus on their conversations without distractions.

Security is another critical aspect of the Cisco 7920. The device supports several security protocols, including WPA and WPA2, ensuring that all communications are encrypted and secure. This is crucial for organizations that handle sensitive information and need to comply with industry regulations.

Additionally, the Cisco 7920 features an extended battery life, enabling users to make calls throughout the day without frequent recharging. Its lightweight design and ergonomic build make it comfortable to use for extended periods.

In terms of integration, the Cisco 7920 IP phone is compatible with various Cisco Unified Communications Manager software versions, allowing for easy configuration and management within existing network infrastructures. Its support for multiple languages also makes it a suitable choice for international organizations, accommodating diverse user groups.

Overall, the Cisco Systems 7920 IP phone combines the necessary features, technologies, and characteristics to meet the demands of modern enterprise communication. Its blend of wireless capability, superior audio quality, security measures, and integration versatility makes it an excellent choice for organizations seeking efficient and reliable communication solutions.
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