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Cisco Aironet Series 1700/2700/3700 Access Point

Deployment Guide

Last Updated: October, 2014

Cisco Aironet Series 3700 Access Point

Abstract

This section covers the Cisco 3700 Series Access Points theory of operation and installation as part of a Cisco wireless LAN

(WLAN) solution. Subjects related include:

•Choosing the right Access Point (AP).

•Differences between AP 3700 and AP 3600.

•Feature module and ClientLink support.

•Physical/Hardware details, mounting options, bracket choices, and installation considerations.

•Antenna options, radiation patterns, and external antenna deployments.

•Understanding spatial streams, MCS rates and beam-forming (802.11n Primer).

•Review of 802.11ac and Wave-1 module for AP 3600.

•Understanding 802.11ac and Wave-1 for the AP 3700.

•Best Practices–Understanding Channel usage, 80 MHz, and available 11ac clients.

•802.11ac performance considerations.

This document is intended for trained and experienced technical personnel familiar with the existing Cisco Wireless

Networking Group (WNG) product line and features.

Cisco Aironet Series 1700/2700/3700 Access Point Deployment Guide

Cisco Aironet Series 3700 Access Point

Choosing the Right Access Point

Models

The Cisco 3700 Series Access Point (AP 3700) targets customers requiring support for mission-critical applications. The AP

3700 embodies ClientLink 3.0, an innovative antenna technology comprising four transmit radios and four receive radios called

4X4 in a Multiple Input Multiple Output (MIMO) configuration supporting 3 spatial streams (3SS) together referenced as

4x4:3. Using this type of antenna system along with additional Modulation Coding Schemes (MCS rates supporting up to 256

QAM) and 80 MHz channel bonding, rates of up to 1.3 Gbps can be supported.

ClientLink 3.0–using these features along with an additional antenna (N+1)–allows for beam-forming for all 802.11a/g/n

clients (like ClientLink 2.0) and now beamforms to 11ac 3 spatial streams clients.

Figure 1 Access Point Portfolio Placement

Access Points are available in three models:

•Internal antennas version labeled “i” have captured antennas (part of the housing and not removable). The “i” series is

designed for indoor Enterprise installations, where office aesthetics are a primary concern.

•External antennas version labeled “e” are more rugged and designed for industrial use in locations, such as hospitals,

factories, warehouses, and anywhere a need exists for external antennas and/or extended operating temperatures. The “e”

version also supports mounting inside NEMA enclosures for use in the most demanding environments.

•Access Points for Professional Installations are labeled “p” series and may be used in outdoor applications.

Cisco Aironet Series 1700/2700/3700 Access Point Deployment Guide

Cisco Aironet Series 3700 Access Point

Figure 2 AP 3700 Models and Eco-Packs

Figure 3 AP 3600 Models and Eco-Packs

Cisco Aironet Series 1700/2700/3700 Access Point Deployment Guide

Cisco Aironet Series 3700 Access Point

Differences between the AP 3700 and AP 3600

The mechanical front of the AP 3700 and AP 3600 are similar in physical appearance with the exception of the “industrial cuts”

along the edges of the 3700 (left) and the deeper recess around the logo area. This allows for easy visual identification of the

different AP device types.

Figure 4 AP 3700 vs. AP 3600 (External Antenna Models)

Figure 5 AP 3700 and AP 3600 (Backside Identical)

The AP 3700e supports 802.11ac (Wave-1) native. This frees the feature module slot for additional functionality while also

permitting external antenna connections for 802.11ac data rates (w/AP 3700e).

Cisco Aironet Series 1700/2700/3700 Access Point Deployment Guide

Cisco Aironet Series 3700 Access Point

Figure 6 Identifying APs Physically

Feature Module Support

AP 3700 and AP 3600 have integrated support for option modules. The goal in supporting a modular design is to offer a product

that can provide longevity and true flexibility as technology changes. This provides a real value protection for customers. It

also provides Cisco with an opportunity to introduce new features and functionality into a current stable platform.

The Wireless Security and Spread Spectrum Intelligence (WSSI) module adds new functionality to the AP to future-proof

customers' investment. This module provides a dedicated monitor radio to scan the full spectrum (not just the channel on which

the AP is operating). It will offload complete monitoring and security services to the monitor module including CleanAir,

WIDS/WIPS, Context-aware Location, Rogue Detection, and Radio Resource Management (RRM). This module allows for

full spectrum analysis on all channels on both the 2.4 and 5 GHz bands.

Having a WSSI module avoids having the need to deploy a separate, dedicated overlay network for full spectrum monitoring

and eliminates the need for an extra cable pull and additional infrastructure costs (Figure 7).

There is also an option module for the AP 3600 that provides 802.11ac (Wave-1) functionality. This option cannot be used on

the AP 3700 because it already has 802.11ac (Wave-1) integrated. This option module for the AP 3600 will operate at 5GHz

and allow the AP 3600 to fully support 802.11a/n along with 802.11ac clients. Wave-1 functionality supports a 1.3 Gbps PHY

/ ~1 Gbps MAC (throughput) using 3 spatial streams, 80 MHz, and 256 QAM. The option module does not support ClientLink

2.0 but rather supports the Explicit beamforming specification that is part of the 802.11ac standard.

Look out for additional modules for 3/4G support and 802.11ac Wave-2.

Use of option modules may require local power supply, Cisco power injector, .3at PoE+, or the use of Cisco Enhanced PoE, as

the module typically increases the power draw to greater than 15.4 W (.3af).

Note Cisco Enhanced PoE was created by Cisco and is the forerunner to 802.3at PoE+.

Cisco Aironet Series 1700/2700/3700 Access Point Deployment Guide

Cisco Aironet Series 3700 Access Point

Figure 7 Feature Module of the Bottom of the AP 3700 and AP 3600

Beamforming – Understanding ClientLink

The AP 3700 supports the new “ClientLink 3.0” and is able to beamform to 802.11ac clients including 1, 2, and 3 spatial

streams. It also supports all ClientLink 2.0 functionality with legacy 11a/g clients and 802.11n 1, 2, and 3 spatial stream clients.

The AP 3600 supports ClientLink 2.0 which beamforms to legacy 11a/g clients and 11n 1, 2, 3 spatial stream but does not

support ClientLink 3.0 (Cisco beamforming method to 11ac clients).

Both the AP 3700 and AP 3600 with module supports the 802.11ac beamforming standard known as ECBF (Explicit

Compressed Beam Forming)–a new IEEE method of beamforming that is emerging but not yet fully supported in 11ac clients.

Cisco ClientLink is similar but can work with all clients today including 11a/g/n as well as 11ac clients. ClientLink also takes

advantage of the extra transceiver in the AP, so it beamforms to clients with 3 spatial streams.

Cisco Aironet Series 1700/2700/3700 Access Point Deployment Guide

Cisco Aironet Series 3700 Access Point

Figure 8 ClientLink Feature Comparison

Both AP 3700 and AP 3600 support a 4x4:3 architecture. However, AP 3600 only supports 11ac in a 3x3:3 mode and lacks the

ability to beamform AC clients beyond 7 clients at a time. But, AP 3700 can beamform 128 clients per radio interface.

Table 1 Feature Comparison between AP 3600 and AP 3700

Feature Comparison AP 3600 AP 3700

Max. Data Rate 450 Mbps

1.3 Gbps – 11ac Module

1.3 Gbps

Radio Dual Radio, 2.4 and 5 GHz Dual Radio, 2.4 and 5 GHz

RF Design (MIMO:SS) 4×4:3 – Integrated Radios

3×3:3 – 11ac Module

4×4:3

Power Draw 4×4:3 + 3×3:3 = 802.3at

5 GHz only = 802.3af

4×4:3 = 802.3at

3×3:3 = 802.3af

Client Count 200 – per integrated radio

50 – 11ac Module

200 – per integrated radio

Beamforming ClientLink 2.0a/g/n – AP

ECBF with 11ac Module

ClientLink 3.0a/g/n/ac

and ECBF with 11ac

Beamforming Client Count 128 – per integrated radio

7 – 11ac Module\

128 – per integrated radio

Spectrum Intelligence CleanAir CleanAir

Cisco Aironet Series 1700/2700/3700 Access Point Deployment Guide

Cisco Aironet Series 3700 Access Point

APs Physical Hardware and Mounting Options

AP 1600, 2600, 3600, and 3700 have similar physical dimensions with a few differences in physical appearance, most of which

are cosmetic changes to distinguish the different models. The mounting options and bracket configurations are identical and

interchangeable.

Figure 9 Mechanical Drawing of APs 1600, 2600, and 3600

RRM Available Available

Modules WSSI

802.11ac Wave1

3G Small Cell

802.11ac Wave2

WSSI

3G Small Cell

802.11ac Wave2

Table 1 Feature Comparison between AP 3600 and AP 3700 (continued)

Feature Comparison AP 3600 AP 3700

Cisco Aironet Series 1700/2700/3700 Access Point Deployment Guide

Cisco Aironet Series 3700 Access Point

Figure 10 3700 Mechanical Drawing

There are many different installation options available depending upon the requirements of the customer. Brackets are available

from Cisco as well as third-party companies. During the ordering process, the customer may choose one of two brackets (but

not both). Each bracket is a zero-dollar ($0) option at the time of configuration. If the customer does not choose a bracket, the

selection default is AIR-AP-BRACKET-1, which is the most popular for ceiling installations. The other choice is a universal

bracket that carries part number AIR-AP-BRACKET-2 (Figure 11).

Figure 11 Access Point Bracket Choices - If You Are Using the AP 3600 Module, We Recommend AIR-AP-Bracket-2

If the AP needs to be mounted directly to a ceiling on the gridwork, then AIR-AP-BRACKET-1 is mounted flush and has the

lowest profile. However, if the AP is mounted to an electrical box or other wiring fixture, or inside a NEMA enclosure or

perhaps wall mounted, then AIR-AP-BRACKET-2 is a better choice. The extra space in the bracket allows for wiring, and the

extra holes line up with many popular electrical boxes. When mounting the bracket to the ceiling gridwork, some ceiling tiles

are recessed. For this reason, two different styles of ceiling clips, recessed and flush rails, are available (Figure 12).

Cisco Aironet Series 1700/2700/3700 Access Point Deployment Guide

Cisco Aironet Series 3700 Access Point

Figure 12 Different Clips are Available for Attaching to Ceiling Grid Work

Channel Rail Adapters - Cisco Part Number AIR-CHNL-ADAPTER

When mounting APs to ceiling channel rails such as the ones shown in Figure 13, an optional channel adapter is used,

AIR-CHNL-ADAPTER. It comes in a two-pack and attaches to the ceiling grid clip shown above. Refer to Figure 13 and

Figure 14.

Figure 13 Example of Channel Rails

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