CCNP Wireless CUWSS 642-732 Summary Notes 22 : Assessing RF Coverage

RF Audit The main objective is to verify RF Coverage. The goal is to validate or audit the current WLAN deployment in order to enhance its security and performance. Unlike pre installation site surveys, post installation surveys focus more on the entire site environment. Verify RF footprint of all installed APs. Use Ekahau Survey or AirMagnet Survey PRO. First … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 22 : Assessing RF Coverage →

CCNP Wireless CUWSS 642-732 Summary Notes 21 : Infrastructure requirements Part 2

802.11n APs with 100% duty cycle: the 2,4 band when oversubscribed with clients communicating at 144 Mbps may consume up to 70 - 75 Mbps on wired side. the 5 GHz band when oversubscribed and using 40 MHz channels with clients communicating at 300 Mbps may consume up to 160 - 170 Mbps on wired side. Both … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 21 : Infrastructure requirements Part 2 →

CCNP Wireless CUWSS 642-732 Summary Notes 20 : Choosing Antennas

Antennas Antenna - “an intentional radiator of electromagnetic radiation. Electromagnetic field - a sine wave that has an electric component and a magnetic field component. Indoor antennas are always vertically polarized but this is not critical. Polarization plays a role in Outdoor links where a polarization mismatch can reduce the received signal by 20 dBm. Polarization … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 20 : Choosing Antennas →

CCNP Wireless CUWSS 642-732 Summary Notes 19 : Infrastructure Requirements Part 1

AP Power Options for powering the AP AP model-specific Power module (DC Power) Power Injector - combine 48-VDC power with the data signal, sending both to the access point or bridge. The AIR-PWRINJ3 power injector for Cisco Aironet 1130AG, 1140AG, and 1240AG Series Access Points works with the power supply provided with the access point. The Cisco Aironet Power … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 19 : Infrastructure Requirements Part 1 →

CCNP Wireless CUWSS 642-732 Summary Notes 18 : Hardware for the RF Network

Designing the RF network Define the APs and WLC requirements AP Density This depends on: Application requirements Data Networks (web browsing) 15 to 25 users per AP 802.11b users reduce a 802.11g AP throughput dramatically. The 802.11b client still has a maximum data rate of 11 Mb/s per second and a maximum throughput of 7.1 Mb/s. Data … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 18 : Hardware for the RF Network →

CCNP Wireless CUWSS 642-732 Summary Notes 17 : Ekahau Site Survey

Ekahau Site Survey Tool This tool is used to determine each AP coverage area. It records the signal level, retries, lost packets etc. Ekahau Site Survey comes in a standard version and a Pro version. Standard Pro adds the predictive survey which allows us to add obstacles to the map so as to predict how many APs will be … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 17 : Ekahau Site Survey →

CCNP Wireless CUWSS 642-732 Summary Notes 16 : Layer 2 Active Site Survey using AirMagnet Survey Pro

AirMagnet Survey Layer 2 site survey can be performed with AirMagnet Survey PRO to determine the access point placement and coverage. AirMagnet Survey PRO has the capability of doing pre-site surveys (before the install) and post-site surveys (after the install), also known as an audit, to ensure adequate coverage. In the configuration menu: Select the SSID Set the Tx … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 16 : Layer 2 Active Site Survey using AirMagnet Survey Pro →

CCNP Wireless CUWSS 642-732 Summary Notes 15 : Attenuation and Data Rates

RF Reflectors and Absorbers in the building Signal Attenuation Each 3-dB attenuation reduces the signal strength by half Moving objects may also affect the signal Break rooms and test labs may produce 2.4-GHz iinterference and create multipath distortion and RF shadows. Elevator shafts block and reflect RF signals. Supply rooms with inventory absorb RF signals. Interior offices … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 15 : Attenuation and Data Rates →

CCNP Wireless CUWSS 642-732 Summary Notes 14 : Layer 1 Active Site Survey – Cisco Spectrum Expert

Cisco Spectrum Expert: Active Site Surveys (Layer 1 Sweep) Recommended tool of choice - Cisco Spectrum Expert With Cisco Spectrum Expert, you can detect, classify, locate, and mitigate sources of wireless interference to optimize network performance for mobility applications. Cisco Spectrum Expert is a combination of both hardware and software. Cisco Spectrum Expert is delivered as hardware in … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 14 : Layer 1 Active Site Survey – Cisco Spectrum Expert →

CCNP Wireless CUWSS 642-732 Summary Notes 13 : Defining Site Survey Documentation

Define the Deliverables A site survey preassessment form to help determine the length and type of survey, what equipment will be needed, and what questions the engineer will need to ask during the walk through the facility. Pre-Assesment Form that summarizes customer requirements Customer contact information WLAN Objectives Building to be covered Physical Information and Building Size Number … Continue reading CCNP Wireless CUWSS 642-732 Summary Notes 13 : Defining Site Survey Documentation →