HP ProCurve MSM317 Guida di riferimento rapido

HP MSM317 Access Device

Deployment guide

Technical white paper

Table of contents

Introducing the MSM317...................................................................................................................... 2

MSM317 versus traditional access points ............................................................................................... 4

Installation considerations..................................................................................................................... 7

Radio frequency properties of the MSM317........................................................................................ 7

Location planning............................................................................................................................. 8

Checking radio coverage................................................................................................................ 12

Adjusting power output and data rates ............................................................................................. 12

Power over Ethernet ........................................................................................................................... 13

Uses of the pass-through port .............................................................................................................. 14

Switch functionality on the MSM317.................................................................................................... 14

Deploying Voice over IP ..................................................................................................................... 15

VLAN configuration on non-LLDP-MED capable devices ...................................................................... 15

Deploying IP phones—LLDP-MED devices .......................................................................................... 16

Authentication ............................................................................................................................... 17

Configuring per-room guest VLANs ...................................................................................................... 18

VoIP/LLPD-MED use cases................................................................................................................... 19

Introducing the MSM317

Over the last five years, the expectations of hotel guests for wireless connectivity have changed

dramatically. Earlier wireless deployments consisted of hotspot services in public areas such as

lobbies and food service locations. Today, wireless connectivity in guest rooms has become pervasive

in almost all brand segments. In the lucrative business and luxury markets, guests are highly valued for

their loyalty as it often leads to repeat and referral business. Consequently, pressure to meet the

wireless demands of guests for consistent, high-performance connections that support all of their Wi-Fi

devices—just like at home or in the office—is extremely high.

These expectations expose shortcomings in traditional approaches to deploying guest networks in

hospitality settings. Provisioning a traditional access point (AP) to provide coverage to multiple rooms

creates an inconsistent guest experience for two key reasons. First, the performance of an individual

connection decreases the farther away it is from the AP. Second, performance for all users is

compromised by the presence of low data rate connections, which causes degradation throughout the

system due to the sharing of the wireless medium. The proliferation of wireless devices, such as

smartphones and smartbooks adds pressure to network capacity, further eroding performance.

Figure 1: A wide variety of devices can be connected to the MSM317. You can configure the network to send traffic through

the MSM7xx Controller or, in cases where private access areas are isolated from public spaces, you can bypass the controller

completely. Where VoIP phones are deployed, for example, this avoids an additional hop that can slow service.

The MSM317 is an integrated switch/wireless AP designed from the ground up for high-density

environments. This discrete device enables an optimal Internet access experience and more. The same

device supports the delivery of other applications demanded by guests and occupants today—IPTV,

VoIP, and other IP-based services—while paving the way for future services that can further enhance

the end-user experience.

Requiring only a single Power over Ethernet (PoE) cable drop to support voice, video, and data, the

MSM317 simplifies installation and decreases expensive site surveys required with traditional APs. Its

four-port switch and AP are centrally managed through the HP MSM7xx Controller. This means faster

configuration of multiple devices, automated software updates, and the delivery of a consistent set of

services throughout the network. In short, the MSM317 revolutionizes the deployment of converged

environments, all at a reduced cost of ownership.

Note:

This guide assumes the use of version 5.5 software on the MSM317 and

MSM7xx Controller. If you are using an older version, it is recommended

that you upgrade immediately.

Features and benefits of the MSM317

The MSM317 is purpose-built for cost-effective, high-density deployments focused on quality of experience. Key

features include:

•Converged wired/wireless solution

•Dedicated service per room

•Simplified installation—single cable for voice, video, and data

•Mounts in standard electrical wall box

•802.11 b/g access point

•4-Port, 10/100 managed switch

•Powered by 802.3af or 802.3at PoE

•Single PoE port

•Centralized configuration and management through MSM7xx Controller*

•LLDP-MED for automatic IP phone configuration at switch port

•Quality of Service (QoS) and rate limiting for delivery of latency-sensitive applications

•Loop protection at switch ports

•Pass-through RJ-45 connection for support of legacy devices

•Bulk moving of devices between groups using controller interface

Note:

* The MSM317 is a controlled-mode only device. Use of an HP MSM7xx

Controller is required to configure it.

MSM317 versus traditional access points

The MSM317 offers several features that distinguish it from a standard access point and make it the

right choice for high-density deployments. The table below provides a side-by-side comparison of the

MSM317 and the HP E-MSM310 AP.

Feature MSM317 MSM310

Connectivity Dedicated wireless connectivity per room.

Excellent choice for high-density deployments

where high-quality guest experience is

top priority.

Shared bandwidth across many users. Correct

choice for public spaces such as conference

rooms, lobbies, restaurants, and outdoor areas.

Coverage area Designed for a small space of up to

430 square feet (40 square meters).

Designed for medium to large spaces of up to

10,000 square feet (930 square meters).

Output power 802.11g–14.5 dBm (28 mW) or

802.11b–6 dBm (39 mW) maximum. Ideally

suited for high throughput with the fewest

errors and least amount of interference

between APs.

Approximately 20 dBm (100 mW). Higher

output power delivers adequate coverage to

large spaces.

Antenna Two internal omnidirectional antenna chips

with separate horizontal and

vertical polarities.

Two, 2 dBi dual-band 2.4/5 GHz

omnidirectional antennas for 360 degree

horizontal radiation pattern.

Power 802.3af PoE and 802.3at PoE+. Less

cabling, cheaper than AC power, reduced

carbon footprint, and fits into standard

electrical wall boxes.

802.3af PoE or 5 VDC from available AC power

supply. May require new wiring to add

access points.

Switching Integrated 4-port, 10/100 Ethernet switch for

delivery of voice, video, and data services.

None.

Figure 2:Traditional APs transmit at a higher output power than the MSM317 in order to provide coverage to a large area.

Multiple users need to share bandwidth.

Figure 3:Designed with small spaces in mind, the MSM317 helps to reduce interference with other APs.

In a typical hotel configuration, the AP resides in a corridor and provides shared bandwidth to

multiple rooms. This set up generally works well for a limited pool of users. As network load

increases, however, performance is likely to degrade, especially during peak usage periods.

One solution is to boost the AP’s output power to extend its reach, however, this presents several

potential pitfalls. First, clients at the periphery may not have enough power to reach the AP.

Second, there is the matter of fairness to users. Those on the periphery may experience lower

throughput, while those closer to the AP may see a lack of responsiveness. Third, the risk of

interference and transmission errors increases at higher power levels. Another option is to add APs,

but this would require paying for new wiring and site surveys and does not address delivery of

IP-enabled services.

In contrast to a standard AP, the MSM317 delivers dedicated, predictable coverage per room,

providing distinct advantages over conventional deployments. Benefits include a dedicated wireless

connection per user and reduced risk of signal interference due to the unit’s radiation pattern and

lower output power. Scaling up is also easier and more affordable as the MSM317 fits into a

standard electrical wall box and requires only a single PoE cable drop. Finally, its built-in Ethernet

switch delivers voice, video, and data services, while the pass-through port allows for the integration

of legacy devices.

Note:

Roaming is supported between traditional APs and the MSM317.

Figure 4:Output power to data rate ratio of the MSM317 compared to a full-power AP.

6 9 12 18 24 36 48 54

Output power (±1.5dBm)

Data rate (Mbps)

MSM317

MSM310

Installation considerations

Proper planning and configuration of the MSM317 are critical for providing high-quality wireless

service. This section provides an overview of the radio frequency properties of the MSM317,

considerations for setting output power and data rates, and guidelines for where to install the unit.

Radio frequency properties of the MSM317

The MSM317 features a built-in 802.11 b/g radio with two integrated 2.4 GHz omnidirectional

antennas. This helps to produce the strongest possible signal and reduce leakage between rooms. The

signal propagates away from the wall on which the unit is mounted, resulting in reduced radiation

from the back of the device and less risk of interference with the adjacent room.

Figure 5:Comparison of actual throughput between an 802.11n and 802.11g 1x1 device.

Comparing 1x1 wall

jack solutions

When comparing wall jack

solutions that support one

spatial stream (1x1

configuration), 802.11n

enabled devices can deliver

higher throughput, but there

are limitations in the

implementation of the

standard. This is due to the

RTS/CTS overhead that

occurs when servicing

legacy clients, which

prevents a 1x1 device from

using a 40 MHz channel.

The throughput comparison

chart shows in real-world

terms the difference in

performance between a 1x1

b/g and an 11n wall jack

solution. As the chart shows,

the difference in data rates

between the two is small

and becomes even less

significant when you factor

in RTS/CTS overhead.

Figure 6:The MSM317 provides 120 degrees or greater signal coverage on the horizontal plane and a vertical signal that is

narrower than that of a traditional AP.

Location planning

Care should be taken to install the MSM317 in a location where there are as few obstructions as

possible to the signal. It is recommended that you mount the unit in an exposed area, such as under a

desk (without a courtesy panel) or on a wall. You may also consider mounting it in a hollow hidden at

the back of a wood desk (however, there may be some signal attenuation depending on the density

of the wood). In addition, be sure to install the unit with its faceplate as this helps to keep the antenna

external and maintain airflow around the device.

Before deployment, closely consider your environment, including building materials, building design,

and equipment. Metal, which may be contained in walls, windows, or equipment, is likely to block or

diminish the signal.

In addition, if you deploy the MSM317 in certain places, such as behind a minibar or wall, expect to

see significant variation from ideal conditions. Glass and wood, on the other hand, generally have

less impact on signal strength.

Figure 7:The faceplate of the MSM317 helps to prevent the antenna from being blocked behind a wall or enclosure and keep

the unit from overheating. The trim panel is vented to allow airflow..

The following figures are WLAN coverage maps created using HP RF Planner software for two

different room types. These maps reveal available signal strength in dBm at various points in

the rooms.

Figure 8 shows an actual configuration of two typical rooms in a luxury hotel. The map is overlaid

with the anticipated RF coverage pattern, and an MSM317 is deployed in each room (A).

The area of each room is 34 square meters (that is, within the 40 square meter guideline for

successful deployment).

The signal strength in the sleeping and living areas (B) is excellent, as is the delineation of coverage

between the rooms. Signal strength at the periphery of the coverage area, and in particular in the

bathrooms (C), has diminished to the point that higher-speed connections would be difficult

to maintain.

The primary contributor to signal degradation in the bathroom is room construction, as the interior of

the room is lined with granite tiles. The coverage characteristics could easily have been improved by

moving the MSM317 to a more central position on the same wall. In this case, however, room décor

and colocation with other in-room services was traded off against improved coverage in the

bathroom, and deployment was continued at the planned location.

Figure 8:WLAN coverage map for two typical rooms in a luxury hotel.

Figure 9 shows a room from the same property in a suite configuration. The room is 110 square

meters (more than twice the recommended size). Based on deployment of the MSM317 (A), coverage

in the sleeping and living area (B) is excellent. The bathroom (C), which features granite tiles, has

useable coverage due to its proximity to the MSM317 (although the tiling impacts coverage in the

area adjacent to the bathroom). Coverage in the sitting and kitchen area (D) is inconsistent, ranging

between good to nonexistent. This can be attributed to the reinforced concrete wall separating the

room’s two main areas. Given the room’s size and construction, the coverage pattern of the MSM317

is expected. Solutions for improving coverage in these high-value rooms include:

•Deploying a second MSM317

•Using a standard AP in the room as an alternative to multiple MSM317s

•Filling in the coverage gaps for multiple rooms by installing a standard AP in the corridor

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