Cisco 802.11 Wireless Networking Quick Reference by Toby Velte, Anthony Velte

By Toby Velte, Anthony Velte

A short reference for community engineers and directors, who're imposing or have carried out Cisco instant technologies.Find 802.11 WLAN info speedy and simply with this useful referenceAccess product info speedy and make judgements easilyConfigure and troubleshoot entry issues in a pinchSecure your instant community with useful, easy-to-use tipsTune and optimize your WLAN with tricks and guidance during this guideCisco 802.11 instant Networking speedy Reference is a short reference for community engineers and directors who paintings with Cisco instant applied sciences. it's a worthy hands-on speedy reference for someone making plans, deploying, handling, optimizing, or troubleshooting a instant community, and enhances the suite of instant networking books within the Cisco Press catalog. This easy-to-use hands-on pocket reference is helping readers easily practice on-the-job projects on instant networks. every one bankruptcy and part grants easy-to-understand causes and advice community engineers can enforce straight away. half I offers description and research of Cisco instant LAN units; half II describes configuration essentialsl; and half III illustrates troubleshooting, tuning, and function administration. This pocket reference be utilized by community execs who're contemplating which Cisco instant apparatus to buy; contemplating imposing a Cisco answer with different proprietors' instant apparatus; making plans so as to add instant services to the neighborhood sector community; configuring entry issues and shopper units; handling instant networks; reading and imposing protection on instant networks; appearing upkeep, troubleshooting, and tuning or instant networks.

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4-GHz devices, Cisco offers a broad range of antennas for unique needs. Table 2-2 compares these models. 55 56 Table 2-2. Cisco 5-GHz Bridge Antennas Part Number Type Description Beam Width Gain Range AIR-ANT58G9VOA-N Omnidirectional Used with the Cisco 1400 Wireless Bridge. Nondiversity antenna for outdoor applications. 360 degrees horizontal 6 degrees vertical 9dBi 8 miles at 9 Mbps 2 miles at 54 Mbps AIR-ANT58G10SSA-N Sector Used with the Cisco 1400 Wireless Bridge. Nondiversity antenna for outdoor applications.

Table 2-1 compares these antennas, stacking their type, beam width, gain, and ranges up against each other. Table 2-1. 4-GHz Antennas Part Number AIR-ANT5959 Type Description Diversity Ceiling-mounted, Omnidirectional indoor, diversity antenna. Low profile design makes it Beam Width Gain Range 360 2dBi 350 ft. at 1 degrees Mbps horizontal 295 ft. at 6 Mbps 53 54 inconspicuous. AIR-ANT4941 Omnidirectional Single dipole antenna providing indoor, omnidirectional coverage. 80 degrees vertical 360 degrees horizontal 65 degrees vertical 130 ft.

Because the signals that bounce around travel a longer path than a signal that is received directly from the antenna, the multiple signals are no longer in phase with each other. Instead, they are in a random phase. Multiple signals that are in-phase are ideal; they create better reception. However, out-of-phase signals can cancel each other out or cause packet retries to occur. Multipath distortion occurs most often in places with highly RF-reflective surfaces, such as metal, coated glass, or furniture.

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