Cisco Systems AIRRM3000ACAK9 manual 802.11n Primer Understanding Spatial Streams

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802.11n Primer - Understanding Spatial Streams

Figure 49 Example of a high gain antenna AIR-ANT2480V-N with cover removed

A high gain antenna may have a null or dead spot directly underneath it as the antenna element is often much longer with less metal surface area available to conduct the radio wave if you are located directly underneath it, however; the further away you are from the antenna the more surface is available and so the better it performs.

802.11n Primer - Understanding Spatial Streams

For a video on understanding the fundamentals of Spatial Streams see the following URL:

http://www.cisco.com/en/US/netsol/ns767/index.html

MIMO, which refers to a radio system that has multiple separate receive and transmit paths, is at the heart of 802.11n. MIMO systems are described using the number of transmitters and receivers in the system. For example, "two by one" or 2x1 refers to a system with two transmitters and one receiver (Figure 50).

Spatial streams, the act of transmitting information out of more than one antenna port concurrently, requires that the AP have at least two or more transmitters and support elements of 802.11n, e.g., support of multiple spatial streams.

In the 802.11a/b/g days data rates were actual Mbps rates like 2, 11, 54 Mbps etc., and was done with one transmitter. In the case of the AP 3500 series it has two transmitters per band so it supports 802.11n data rates up to 300 Mbps using two spatial streams.

With 802.11n the different rates are called Modulation and Coding Scheme (MCS) index value, and the value also defines how many streams are used. The AP 3500 supported up to 300 Mbps (MCS rate 15 configured with a bonded channel and short guard interval (GI). Refer to Figure 51. The MCS values correspond to actual data rates.

Cisco Aironet Series 1600/2600/3600 Access Point Deployment Guide, Release 7.5

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Contents Cisco Systems, Inc Table of Contents AbstractAudience Models Choosing the Right Access PointAccess Point Portfolio Placement AP 3600 Models and Eco-packs Differences between the AP 3600 and AP 3500 Access Points Bottom of AP 3600 Unit Differences between the AP 3600 and AP AP 3600 Feature Module SupportDifferences between the AP 3600 and AP Introducing Cisco Aironet 1600 Series Access Point Comparison of CleanAir features Cisco Clean Air ExpressComparison 3600, 2600 and 1600 series Access Points Access Point Physical Hardware and Mounting OptionsMechanical Drawing of the AP 2600 and the AP Recessed and Flushed Ceiling Grid Clips Channel Rail Adapters Cisco Part Number AIR-CHNL-ADAPTERAIR-CHNL-ADAPTER left Slides onto the Rails Wall-mounting the AP Changing the Color of an AP Clean Rooms Healthcare Unique InstallationsAbove Ceiling Tiles Example of how to hang an AP above the ceiling tiles Areas with High Vibration Stadium/Harsh EnvironmentsWarehouse and Factory AP Placement in Warehouse Environment Ethernet Cable Recommendation Access Point Spacing Recommendations Installations at Very High AltitudesInstallations Inside and Around Elevators For use with AP 1600/2600 and 3600e Access PointsExternal Antenna Options and Patterns External Antenna Options and Patterns External Antenna Options and Patterns External Antenna Options and Patterns External Antenna Options and Patterns AP 3600i, AP 2600i, and AP Radiation Patterns for the AP 3600i @ 2.4 GHz Radiation Patterns for the AP 2600i @ 2.4 GHz Radiation Patterns for the AP 1600i @ 2.4 GHz Understanding External Antenna DeploymentsUnderstanding External Antenna Deployments Understanding External Antenna Deployments Antenna Placement Understanding External Antenna Deployments 802.11n Primer Understanding Spatial Streams AP 3500i/e is a 2x32 system supports up to 2 transmit chains AP 3600 4 Transmitters and 4 Receivers per Radio Band Understanding Beamforming ClientLink 1.0 Clients That Support Three Spatial StreamsClientLink Site Survey Considerations Site Survey Sensitivity and SNR General Considerations Regarding Access Points 802.11ac Primer How is it different from 802.11n? 802.11ac Primer How is it different from 802.11n? Typical Wave-1 data rates @ 2 and 3 spatial streams Understanding 802.11ac and the option module AP 3600 Radio Module Cisco Part Number AIR-RM3000AC-x-K9=Radio Module Operational Overview Switches that support the AP Understanding 802.11ac and the option module Current channel allocation plan US Theater 802.11ac Client Recommendations Client Band SteeringUSB clients available today Radio Interfaces and Understanding Client AssociationsUnderstanding RF radio interfaces Troubleshooting the module basicsThings to look for if the module is not found Patch antenna against a metal fence Quick Look at a few Non-Optimal InstallationsAbout Quick Look at a few Non-Optimal Installations Which AP is best for manufacturing and warehouse areas? Misc. Questions and AnswersMisc. Questions and Answers URL Links and Other Resources AP 3600 datasheet AP and controller datasheetsURL Links and Other Resources

AIRRM3000ACAK9 specifications

Cisco Systems has long been a leader in networking solutions, and one of its standout offerings in the wireless access point market is the AIR-RM3000-AK9 model. This device is designed to provide high-performance and reliable wireless connectivity for a wide range of applications, making it an ideal choice for organizations that demand robust networking capabilities.

One of the main features of the AIR-RM3000-AK9 is its dual-band operation, which allows it to operate on both the 2.4 GHz and 5 GHz frequency bands. This dual-band capability enables the access point to support a greater number of devices and deliver higher data throughput, thereby enhancing the overall user experience. The access point can automatically select the best band, ensuring optimal performance based on network conditions and user requirements.

The device also supports the latest Wi-Fi 5 (802.11ac) standard, delivering impressive wireless speeds and improved capacity compared to previous generations. With Multi-User Multiple Input Multiple Output (MU-MIMO) technology, the AIR-RM3000-AK9 can communicate with multiple devices simultaneously. This feature is particularly advantageous in crowded environments, as it helps to reduce latency and increase overall network efficiency.

Security is another critical aspect of the AIR-RM3000-AK9. It offers advanced security protocols such as WPA2 and WPA3, ensuring that data remains protected as it traverses the wireless medium. Additionally, with Cisco's identity and access services, organizations can manage user access and maintain compliance with security policies.

The access point is also designed for easy deployment and management. With support for Cisco DNA Center, network administrators can leverage a centralized platform for monitoring, troubleshooting, and optimizing network performance. This capability is essential for reducing operational costs and improving overall network reliability.

Moreover, the AIR-RM3000-AK9 features advanced Quality of Service (QoS) capabilities to prioritize traffic, ensuring that critical applications receive the bandwidth they need for seamless operation. This feature is particularly beneficial for organizations that rely on real-time applications such as video conferencing and VoIP.

In summary, Cisco Systems AIR-RM3000-AK9 access point stands out due to its dual-band operation, support for Wi-Fi 5, MU-MIMO technology, robust security features, and ease of management. These characteristics make it an excellent choice for businesses seeking to enhance their wireless networking capabilities while ensuring high performance and security.
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