Cisco Systems 7920 IP manual Network Sizing, Number of 802.11b Devices per AP

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RADIUS functionality in a small office, but could also be used as a ACS server in case of WAN failure.

The following is a step−by−step example of configuring the fallback RADIUS server for LEAP authentication:

1. Configure the Network Access Server (NAS), by issuing the following commands:

radius−server local

nas 192.168.10.35 key Cisco nas 192.168.10.45 key Cisco

2. Configure the user database, by issuing the following commands:

radius−server local

user BM−AP1200−one−SCM password Cisco user BM−AP1100−two−SCM password Cisco user testuser password Cisco

3.Configure the local RADIUS server in the APs RADIUS server list, by issuing the following commands:

aaa group server radius rad_eap

server 192.168.10.45 auth−port 1812 acct−port 1813

radius−server host 192.168.10.45 auth−port 1812 acct−port 1813 key Cisco

4. Configure the RADIUS server timeouts, by issuing the following commands:

radius−server deadtime 10

5. Disable client holdoff, by issuing the following command:

no dot11 holdoff−time

Network Sizing

Outside of normal IP Telephony design guidance for sizing (such as a Public Switched Telephone Network (PSTN) gateway ports, transcoders, and WAN bandwidth), there are several 802.11b specific considerations to address.

Number of 802.11b Devices per AP

Between 15 to 25 802.11b devices per AP is recommended. Normal caveats apply in terms of traffic types, usages patterns, and physical space coverage.

Number of 802.11b IP Phones per AP

Before any discussion about network planning can take place, it helps to understand the basics of the overall network capacity. The chart below shows the theoretical maximum throughput of an 802.11b WLAN network. The highlighted sections show the data that is relevant for the packet sizes of VoIP traffic (G.711 and G.729).

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

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Contents Table of Contents Prerequisites IntroductionRequirements Components Used Cisco 7920 IP Phone OverviewWlan Overview RF Overview Site Surveys and Design RecommendationsRssi VoIP QoS∙ Delay Variation Jitter Not to exceed 30ms Security for the Cisco 7920 and Wlan Networks Number of 802.11b Devices per AP Network SizingNumber of 802.11b IP Phones per AP Page Numbers of 802.11b Phones per Layer 2 Subnet or Vlan Understanding Roaming Terminology Understanding Layer 2 and Layer 3 RoamingLayer 2 Roaming Page Layer 3 Roaming VLANs Wlan QoS for VoIP Page Page Page Interconnecting WLANs to Cisco Campus Infrastructure Connecting APs to the Catalyst 3550 SMI or EMI Connecting APs to the Catalyst 2950 SI Connecting APs to the Catalyst 2950 EICaveats and Limitations Designing Around the Lack of Layer 3 Roaming Call Admission ControlOther Caveats and Limitations Related Information

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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