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Cisco Systems 71642 Introduction, Prerequisites, Executive Summary, Requirements, Components Used

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Audio Problems

Audio Problems

One−sided Audio

Choppy or Robotic Audio

Registration and Authentication Problems

Appendix A

AP and Antenna Placement

Interference and Multipath Distortion

Signal Attenuation

NetPro Discussion Forums − Featured Conversations

Related Information

Introduction

This document provides design considerations and deployment guidelines for the implementation of the Vocera® Badge Voice over WLAN (VoWLAN) technology on the Cisco Unified Wireless Network infrastructure.

Note: Support for Vocera products should be obtained directly from Vocera support channels. Cisco Technical Support is not trained to support Vocera−related issues.

This guide is a supplement to the Cisco Wireless LAN Controller Deployment Guide and only addresses the configuration parameters that are particular to Vocera VoWLAN devices in a lightweight architecture. Refer to Deploying Cisco 440X Series Wireless LAN Controllers for more information.

This document builds upon ideas and concepts presented in the Cisco IP Telephony Solution Reference Network Design (SRND) and the Cisco Wireless LAN SRND. Both of these SRNDs are available online at http://www.cisco.com/en/US/netsol/ns656/networking_solutions_program_home.html.

Prerequisites

Requirements

It is assumed that readers are familiar with the terms and concepts presented in the Cisco IP Telephony SRND and the Cisco Wireless LAN SRND. Both of these SRNDs are available online at http://www.cisco.com/en/US/netsol/ns656/networking_solutions_program_home.html.

Components Used

This document is not restricted to specific software and hardware versions.

Conventions

Refer to Cisco Technical Tips Conventions for more information on document conventions.

Executive Summary

This table summarizes the four key functions and how they behave within a Cisco Unified Wireless network.

Single

Controller

Controller−to−Controller

Layer 2 Roaming

Controller−to−Controller

Layer 3 Roaming

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Cisco Systems 71642 Introduction, Prerequisites, Executive Summary, Requirements, Components Used, Conventions, Appendix A

Contents

Switch Recommendations Deployments and Configuration Vocera Communications Server Capacity The Vocera SolutionWireless Network Infrastructure Wireless Network Infrastructure ConfigurationIntroduction Audio ProblemsNetPro Discussion Forums − Featured Conversations Related Information PrerequisitesVocera Call Capacity Considerations The Vocera SolutionVocera Badge Overview Vocera Communications Server CapacityVoceras Infrastructure Planning Architecture OverviewFigure 2LWAPP Multicast−Unicast Multicast in an LWAPP DeploymentUnicast−Multicast Delivery Method Multicast−Multicast Delivery Method Figure 3LWAPP Multicast−MulticastEnable PIM on an Interface Router and Switch Multicast ConfigurationEnable IP Multicast Routing Routerconfig#ip multicast−routingMulticast Enhancements in Version 4.0.206.0 and Later Disable Switch VLAN IGMP SnoopingDeployment Scenarios Figure 5Single Controller in Multicast−Multicast Mode Single Controller DeploymentFigure 6Multiple Controller Layer 2 Deployment Multiple Controller Layer 2 DeploymentMultiple Controller Layer 3 Deployment Figure 7Multiple Controller Layer 3 Deployment VoWLAN Deployments Ciscos ReccommendationsRecommendations for Multi−Floor Buildings, Hospitals, and Warehouses Construction Methods and MaterialsActivity Levels InventoryLevels of Inventory Multi−Floor BuildingsWarehouses Security Mechanisms SupportedLEAP Considerations Number of Active Calls per Access Point Wireless Network InfrastructureNumber of 802.11b Devices per Access Point Voice, Data and Vocera VLANsBadge Configuration Switch RecommendationsDeployments and Configuration ∙ Subnet Roaming is disabledTune AutoRF for Your Environment ∙ What do I do if my transmit power is too cold? ∙ How do I know if the tranmit power is too hot or too cold?∙ What do I do if my transmit power is too hot? ∙ Isolated BehaviorFigure 9General WLC Configuration Wireless Network Infrastructure Configuration4. Disable Aggressive Load Balancing Create InterfacesCreate the Vocera Voice Interface Wireless−Specific ConfigurationFigure 11802.11b/g Configuration Figure 10List of WLC InterfacesWLAN Configuration Figure 12WLAN ConfigurationConfigure Access Point Detail Figure 13AP DetailConfigure the 802.11b/g Radio Wireless IP Telephony Verification 7. Choose Wireless Access Points 802.11b/g RadiosAssociation, Authentication, and Registration Common Roaming Issues Badge Loses Voice Quality while RoamingOne−sided Audio Audio ProblemsRegistration and Authentication Problems Choppy or Robotic AudioAppendix A AP and Antenna PlacementFigure 17Improper Placement of Antennas Near an I−Beam Figure 20Signal Reflection Caused by a Wall Figure 21Cisco AP1200 Mounted to a CeilingFigure 24Cisco Aironet 2012 Antenna Mounted to a Wall Figure 22Cisco Aironet 5959 Antenna Mounted to a CeilingFigure 23Cisco AP1200 Mounted to a Wall Figure 25Signal−to−Noise Ratio SNR Interference and Multipath DistortionSignal Attenuation Caused By Various Types of Objects NetPro Discussion Forums − Featured ConversationsSignal Attenuation ∙ Vocera Communications System Specifications ∙ Deploying Cisco 440X Series Wireless LAN Controllers∙ Solution Reference Network Design Related Information