Adaptative Code Modulation

7/31/2019 Adaptative Code Modulation

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SOLUTION BRIEF

PTP 800 with Adaptive Coding

and Modulation (ACM)Maximizing PTP 800 link throughput with Hitless and Errorless ACM


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Contents

PAGE 2

Pg Section

3 Executive Summary

4 Introduction5 ACM Overview

6 Key Benefts o ACM

7 How ACM Works

8 Typical ACM Applications

9 Sample Case Studies

9 Using ACM to Achieve Perormance Objectives

10 Case 1: Fixed Mode or Hospital Link

10 Case 2: Increase Hospital Link Throughput

11 Case 3: Minimize Hospital Link Outage

12 Case 4: Use Smaller Antenna or Hospital Link

13 Using ACM to Achieve Greater Range

13 Case 5: Fixed Mode or Sales Ofce

14 Case 6: Increase the Range o the Sales Ofce Link

15 Motorolas Approach to ACM

16 Summary


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Executive Summary

Organizations o all types have experienced a continuing increase in demand or high-bandwidth wireless

communications to support a wide variety o data, voice and video applications. This increasing demand has

accelerated the need or high throughput wireless links at a time when most inormation technology (IT)

budgets and stafng have decreased. One way to meet this challenge is to do more with what you have.

Adaptive Coding and Modulation (ACM) technology can help you do just that. Designed to help increasethroughput over a radio link while making efcient use o the existing spectrum, ACM unctionality adapts

coding and modulation rates to changing environmental conditions. With ACM, you can turn ade margin

into increased throughput and improve link availability. This capability can provide signifcant savings in both

capital expenditure (CAPEX) and overall operating expenditure (OPEX).

This paper explains how ACM can help you achieve these results with your existing or planned Motorola

Point-to-Point (PTP) 800 Wireless Licensed Ethernet Microwave solutions.

Figure 1:PTP 800 Outdoor Unit (ODU)

and Compact Modem Unit (CMU)

PAGE


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Introduction

The universal demand or added throughput is being driven by the growth o multimedia applications.

Currently, video-dominated content accounts or an ever-increasing percentage o the multimedia mix.

Business and government enterprises need high-perormance connectivity and backhaul to support

bandwidth-intensive applications such as on-demand tutorials, video conerencing, online training, media

relations, product demonstrations, Voice-over-IP (VoIP) and video surveillance. At the same time, consumers

want access to services such as online gaming, social networking and on-demand television.

Motorolas PTP 800 Licensed Ethernet Microwave solutions are high-capacity wireless broadband radios

designed to efciently and aordably transport multimedia trafc. However, as with all microwave

radios, PTP 800 systems can experience rain ade and multipath intererence which can adversely aect

microwave transmissions. ACM can eliminate or greatly minimize the eects o rain ade and multipath

intererence.

Traditionally, licensed microwave radios have supported only the Fixed Modulation mode. However, PTP

800 systems, release 02-00 and higher, support both Fixed Modulation and ACM. In the fxed mode,

signifcant ade margin is reserved during the link planning process to provide adequate link availability in

case o rain ade or multipath intererence.

Fade Margin = Dierence between Mean Receive Signal Level (Rx)

and Receiver Threshold at a Given Modulation Mode

Figure 2:Fixed Modulation

Fade Margin

Mean rx signal

Level required

for 16QAM

Fade margin

for 16QAM

16QAM Avail

16QAM Unavail

When the ACM mode is chosen, the ACM eature can turn reserved ade margin into increased link

capacity. Without any hardware change, ACM can maximize throughput by automatically adapting to a

higher modulation and coding rate. When a radio is working in a Fixed Modulation mode, a severe rain

storm can cause a link outage when the rain ade exceeds the reserved ade margin. In contrast, ACM

can keep the link in service and improve the link availability with lower throughput by adapting to a lower

modulation mode.

Figure 3:ACM Modulation Modes

256

QAM

H256

QAM

L128

QAM64

QAM32

QAM16

QAM8PSK

QPSK

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ACM is a standard eature on PTP 800 systems and requires no additional charge. The major advantages o

Motorolas ACM implementation include:

Hitless and Errorless ACM: No bit errors or suspension o trafc ow during modulation shits

Up to 8 levels o ACM profle; supports QPSK, 8PSK, 16/32/64/128/256 QAM with dierent coding rates

Quick modulation shits to cope with up to 100 dB/sec ading

Easy initial setup; no urther user intervention Flexible control; users defne the highest and lowest modulation or ACM

Easy link planning with the PTP LINKPlanner tool

ACM Overview

ACM is an alternate link adaptation method that promises to raise the overall system throughput and

improve the link availability. When ACM is enabled, the radio automatically up-shits and down-shits

the modulation and/or coding rate as radio requency (RF) path conditions change. This enables the radio

transmitter and receiver to negotiate the highest mutually sustainable data rate or the path conditions.

In order to achieve high link availability, a typical licensed microwave link reserves 30 to 40 dB or ade

margin. For a radio confgured to use Fixed Modulation, the radios nominal receive signal level will be muchhigher than the receiver sensitivity threshold o the desired modulation.

For a radio operating in the fxed mode and designed with 99.999% link availability, the average link outage

would be 5.3 minutes in a year. This projected outage would be a result o the receive signal level alling

below the receivers sensitivity threshold. With ACM technology, the radio will down-shit to a lower

modulation i the link budget alls below the threshold that the link can sustain.

Lets consider an example based on a link with a 56 MHz channel operating in the ACM mode. When the

RF condition is good, the radio will work at top mode 256 QAM with a 0.91 coding rate and deliver 368

Mbps (ull duplex) throughput. When the links Signal-to-Noise Ratio (SNR) alls below the threshold o 256

QAM with 0.91 coding, the system will switch to the next lower ACM profle 256 QAM with a coding rate

o 0.80 and deliver 347 Mbps throughput. The switchover will be errorless and hitless, meaning there will

be no bit error or trafc ow suspension.

I the ade intensifes, the radio will shit down to the next ACM profle, 128 QAM, and deliver 303 Mbps

throughput. Should the RF condition continue to worsen, the modulation will move down step-by-step as

the weather condition requires. ACM and enhanced quality-o-service (QoS) control allow high-priority trafc

such as voice and real-time services to pass across the link without difculty.

When the weather condition improves, the radio will automatically switch to the next higher modulation

mode. In this case, the radio would shit rom 128 QAM back to 256 QAM. Switching is always automatic

and perormed as quickly as necessary. The PTP 800s ACM unctionality is designed to cope with up to 100

dB o ading per second.

PAGE

Introduction continued


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Figure 4:ACM Adapting to

Weather Conditions

256QAM-H

256QAM-L

128 QAM

64 QAM

32 QAM

16 QAM

8PSK

QPSK

The consequences o a link outage are oten multiplied, even when the RF link is lost or only 50 milliseconds

Due to TCP/IP timeout, re-routing and recovery, it could easily take several seconds or a TCP/IP session to be

ully recovered. With exceptionally smooth change steps rom QPSK to 256 QAM and errorless and hitless

coding and modulation, the PTP 800 incurs no service interruption as the modulation steps rom one level to

another. In this way, ACM can eliminate the link outage time.

Key Benefts o ACM

When utilizing ACM technology, you can realize several benefts, including:

Improved Spectrum Efciency: Most o the time, the radio will work at top rate mode and provide a

higher average throughput to the end user. Improved Link Availability: By shiting to a lower modulation mode and the resulting improvement in

receive signal quality, extra ade margin will be achieved to deliver higher link availability.

Minimal Link Outage Damage: By keeping the link in service with a lower capacity during deep ade

conditions, ACM greatly minimizes the consequences o a wireless link outage due to TCP/IP layer

timeout, re-routing and recovery.

CAPEX and OPEX Savings: On PTP 800 systems, there is no additional cost to enable ACM. Once

the easy set-up is completed, no urther intervention is required. With Motorolas PTP LINKPlanner, link

planning with ACM can be completed quickly and easily, oten in a matter o hours rather than days. Plus,

with ACM, the operator has the option to reduce the antenna size and/or connect over a longer distance

than with radios operating in a fxed mode.

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ACM Overview continued


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How ACM Works

Operators can enable ACM radios using the installation wizard rom the PTP 800 Graphical User Interace

(GUI) web page. There are two parameters that defne the range o the modulation modes:

Max Mod Mode defnes the highest modulation mode at which the radio can operate

Min Mod Mode defnes the lowest modulation mode at which the radio can operate

Each link direction can adapt the modulation mode independently o the other direction. Ater the minimumand maximum modulation modes are defned, the Maximum Tx Power will be limited by the maximum

transmit power o the highest modulation mode.

Latency or a given mode in ACM is the same as or the same mode in Fixed Modulation.

In operation, the radio will adapt between the Max Mod Mode and the Min Mod Mode based on

measurements o received signal quality. As the receive signal quality improves, the radio will adapt to

higher modulations which will provide greater throughput. As the receive signal quality deteriorates, the

radio will adapt to lower modulations which will provide lower throughput but greater robustness. Each

modulation mode has two thresholds:

One threshold or up-shiting when the signal quality improves

One threshold or down-shiting when the signal quality degrades

Figure 5:

ACM Thresholds Comparedto Fixed Mode

Fixed Mode

ACM

256QAM, Rate 0.83

256QAM, Rate 0.91

64QAM, Rate 0.82

16QAM, Rate 0.91

32QAM, Rate 0.87

8PSK, Rate 0.84

QPSK, Rate 0.80

128QAM, Rate 0.82

Signal-to-Noise Radio (SNR)

To be hitless and errorless during modulation shits, ACM requires a higher SNR than with the Fixed

Modulation mode.

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PAGE

Typical ACM ApplicationsACM is designed to improve PTP 800 perormance in changing environmental conditions. That improved

perormance provides signifcant value or the many varied applications or which PTP 800 systems are

deployed, including:

Building-to-building and campus connectivity Last-mile extensions

Ethernet data, voice and video communications Disaster recovery Backhaul Wire-line redundancy

Video surveillance Distance learning

Voice-over-IP (VoIP) WiMAX and/or LTE backhaul

Leased-line replacement

Businesses, government and educational agencies, health care providers, utility companies, transportation

agencies, service providers, carriers and others use PTP solutions to establish or expand their wireless

networks. I a radio cannot send and receive inormation because o rain ade or multipath intererence,

your wireless link is not doing the ull job.

ACM can help you improve link availability and increase throughput without changing hardware. The key is

to evaluate your environmental challenges and enable ACM where the technology will help you overcome

rain and intererence challenges. The ollowing case studies provide detailed inormation on how ACM canbe applied to specifc situations and requirements.


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Sample Case StudiesIn the ollowing examples, hypothetical link confgurations are presented to illustrate the concept o

enabling ACM to help you achieve specifc link objectives. During actual system setup, you can decide how

to leverage ACM technology to achieve the best possible results or your individual situation.

SampleCases Results Compared to Fixed Mode Confguration

Case 2 ACM Hospital Link

Higher average link throughput

Same link availability

No throughput reduction as compared

with fxed mode

Keep Min Mod Mode the same as

with the fxed mode

Set Max Mod Mode to higher

modulation than fxed mode



Minimized link outage with improved

link availability

Set Min Mod Mode to lowest

modulation

Set Max Mod Mode to top

modulation rate



Same link availability with lower

capacity during deep ade Cost savings on antenna


modulation

Set Max Mod Mode to topmodulation rate

Reduce antenna size

Case 6 ACM Sales OfceLink


Same link availability with lower

capacity during deep ade

Longer range


modulation

Set Max Mod Mode to top

modulation rate

Using ACM to Achieve Perormance Objectives

In the ollowing examples, the link is 5 miles (8 km), requires 99.999% link availability and needs 250 Mbps

throughput. For this case, we chose 15 GHz with 56 MHz channel bandwidth.

Figure 6:Hospital-to-Clinic Path Profle

1620

1600

1580

1560

1540

1520

1500

1480

14601440

1420

1400

Hospital

0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5 3.75 4 4.25 4.5 4.75

Clinic

Range On Path (miles)

HeightAboveSeaLevel(feet)


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Case 1: Fixed Mode or Hospital Link

The radio is set to Fixed Modulation mode at 64 QAM with a 4-oot antenna at each end. As shown

below, the link provides 255.22 Mbps throughput with 99.999% link availability.

Figure 7:Case 1 Fixed Mode

Hospital Link Perormance

Mode

MaxAggregate

User IPThroughput

(Mbps)

MaxUser IP

Throughputin EitherDirection(Mbps)

Hospital Clinic

FadeMargin

(dB)

IPThroughputAvailability

(%)

ReceiveTime inMode

(%)

FadeMargin

(dB)


(%)

ReceiveTime inMode

(%)

64QAM0.82

510.44 255.22 39.98 99.9991 99.9991 39.98 99.9991 99.9991

Link IP Throughput and Availability

Mean IP Throughput Required 250.00 Mbps

Mean IP Throughput Predicted 255.22 Mbps

Percentage o Required IP Throughput 102.09%

Link Symmetry Symmetric

Link Availability 99.9991%

Case 2: Increase Hospital Link Throughput

Now, the objective is to achieve the highest possible throughput with ACM, while still meeting 99.999%

link availability and using the same minimum throughput as or the fxed mode. With no change to the

hardware and ACM enabled, the Min Mod Mode is set to 64 QAM (the same as or the fxed mode).

Then the Max Mod Mode is set to 256 QAM with a 0.91 coding rate which will allow the link availability

to achieve the required 99.999%. .

Figure 8:Case 2 ACM

Increase Throughput Over

Hospital Link

Mode

Max

AggregateUser IP

Throughput(Mbps)

Max

User IPThroughputin EitherDirection(Mbps)

Hospital Clinic

FadeMargin

(dB)


(%)

ReceiveTime inMode

(%)

FadeMargin

(dB)


(%)

ReceiveTime inMode

(%)

256QAM0.91

737.30 368.65 24.87 99.9960 99.9960 24.87 99.9960 99.9960

256QAM0.80

694.38 347.19 24.87 99.9960 0.0000 24.87 99.9960 0.0000

128QAM0.82

607.04 303.52 31.10 99.9980 0.0020 31.10 99.9980 0.0020

64QAM0.82

510.44 255.22 37.98 99.9990 0.0010 37.98 99.9990 0.0010







In comparison to the radio perormance in the fxed mode, the average link throughput has increased to

368.64 Mbps with the link availability remaining at 99.999%. Throughput has increased by 44% with no

hardware change.

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Sample Case Studies continued


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When changing rom Fixed Modulation mode to ACM, the minimum and maximum modulation modes

must be set properly to maintain the same link availability with a guaranteed minimum throughput. The

Min Mod Mode must remain the same modulation as with the fxed mode and the Max Mod Mode

needs to be the highest modulation that the link can sustain to meet the link availability requirement. These

setup changes can be done easily using the PTP LINKPlanner tool.

Case 3: Minimize Hospital Link Outage

In this example, the objective is to achieve the highest possible throughput with ACM while minimizing

the link outage time. With no change to the hardware and ACM enabled, the Min Mod Mode is set to

QPSK, and the Max Mod Mode is set to 256 QAM with 0.91 coding rate. Based on this confguration,

the system perormance would be as shown below.

Figure 9:Case 3 ACM

Minimize Link Outage Over

Hospital Link

Mode

MaxAggregate

User IPThroughput

(Mbps)

MaxUser IP

Throughputin EitherDirection

(Mbps)

Hospital Clinic

FadeMargin

(dB)


(%)

ReceiveTime inMode

(%)

FadeMargin

(dB)


(%)

ReceiveTime inMode

(%)

256QAM0.91

737.30 368.65 24.87 99.9960 99.9960 24.87 99.9960 99.9960

256QAM0.80

694.38 347.19 24.87 99.9960 0.0000 24.87 99.9960 0.0000

128QAM0.82

607.04 303.52 31.10 99.9980 0.0020 31.10 99.9980 0.0020

64QAM0.82

510.44 255.22 34.31 99.9985 0.0005 34.31 99.9985 0.0005

32QAM0.84

405.52 202.76 37.25 99.9989 0.0004 37.25 99.9989 0.0004

16QAM0.79

304.88 152.44 41.35 99.9992 0.0003 41.35 99.9992 0.0003

8PSK0.80

231.70 115.85 43.17 99.9993 0.0001 43.17 99.9993 0.0001

QPSK0.80

154.30 77.15 50.30 99.9996 0.0003 50.30 99.9996 0.0003







In comparison to the radio perormance in the fxed mode, the backhaul currently delivers an average link

throughput o 368.64 Mbps and link availability o 99.9996%. The annual link outage time has been reduced

rom 4 minutes 43 seconds in the fxed mode to 2 minutes 6 seconds in the ACM mode. The ade margin

has improved 10.32 dB, and the throughput has increased by 44% with no radio hardware change or

antenna change.

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Case 4: Use Smaller Antenna or Hospital Link

In this case, the goal is to use a smaller dish while still maintaining 99.999% link availability and the

highest possible throughput with ACM. With the antenna size reduced rom 4 eet (1.2 meters) to

2 eet (0.61 meters) on both ends and ACM enabled, the Min Mod Mode is set to QPSK and the Max

Mod Mode to 256 QAM with a 0.91 coding rate. Using this confguration, the perormance would be as

shown below.

Figure 10:Case 4 ACM

Smaller Antenna Size or

Hospital Link

Mode

MaxAggregate

User IPThroughput

(Mbps)

MaxUser IP


Hospital Clinic

FadeMargin

(dB)


(%)

ReceiveTime inMode

(%)

FadeMargin

(dB)


(%)

ReceiveTime inMode

(%)

256QAM0.91

737.30 368.65 12.73 99.9741 99.9741 12.73 99.9741 99.9741

256QAM0.80

694.38 347.19 12.73 99.9741 0.0000 12.73 99.9741 0.0000

128QAM0.82 607.04 303.52 18.96 99.9914 0.0174 18.96 99.9914 0.0174

64QAM0.82

510.44 255.22 22.17 99.9945 0.0030 22.17 99.9945 0.0030

32QAM0.84

405.52 202.76 25.11 99.9961 0.0017 25.11 99.9961 0.0017

16QAM0.79

304.88 152.44 29.21 99.9976 0.0014 29.21 99.9976 0.0014

8PSK0.80

231.70 115.85 31.03 99.9980 0.0004 31.03 99.9980 0.0004

QPSK0.80

154.30 77.15 38.16 99.9990 0.0010 38.16 99.9990 0.0010

Link IP Throughput and AvailabilityMean IP Throughput Required 250.00 Mbps





In comparison to the fxed mode, the average link throughput has increased to 368.62 Mbps, the link

availability is still 99.999% and the antenna on each end has been reduced rom 4 eet to 2 eet (1.2 meters

to 0.61 meter).

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Using ACM to Achieve Greater Range

In this case, a 2-oot (0.61-meter) antenna is chosen or each end o the link using 7 GHz with 28 MHz

channel size.

Case 5: Fixed Mode or Sales Ofce

With the radio set to 256 QAM, the link can reach 7.7 miles (12.4 km) with 99.999% link availability.

Figure 11:Sales Ofce Path Profle

in Fixed Mode

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5


HeightAb

oveSeaLevel(feet)

1620

1600

1580

1560

1540

1520

1500

1480

1460

1440

1420

1400

1380

Sales Office Warehouse

Figure 12:Case 5 Fixed Mode

Sales Ofce

Link Perormance

Mode

MaxAggregate

User IPThroughput

(Mbps)

MaxUser IP


Sales Ofce Warehouse

FadeMargin

(dB)


(%)

ReceiveTime inMode

(%)

FadeMargin

(dB)


(%)

ReceiveTime inMode

(%)

256QAM0.80

341.02 170.51 17.13 99.9991 99.9991 17.13 99.9991 99.9991







Link Distance 7.705 miles (12.4 km)

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Case 6: Increase the Range o the Sales Ofce Link

With no hardware change and ACM enabled, the Max Mod Mode is set to 256 QAM and the Min Mod

Mode to QPSK, allowing the radio to reach up to 16 miles (25.7 km) with 99.999% link availability.

Figure 13:Sales Ofce Path Profle

in ACM Mode

1620

1600

1580

1560

1540

1520

1500

1480

1460

1440

1420

1400

1380

1360

1340

Sales Office

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Warehouse


HeightAboveSeaLevel(feet)

Figure 14:Case 6 ACM

Greater Range or

Sales Ofce Link

Mode

Max

AggregateUser IP

Throughput(Mbps)

MaxUser IP


Sales Ofce Warehouse

FadeMargin

(dB)

IP

ThroughputAvailability

(%)

Receive

Time inMode

(%)

FadeMargin

(dB)

IP

ThroughputAvailability

(%)

Receive

Time inMode

(%)

256QAM0.80

341.02 170.51 4.65 98.7407 98.7407 4.65 98.7407 98.7407

128QAM

0.84302.24 151.12 10.88 99.9108 1.1701 10.88 99.9108 1.1701

64QAM0.82

250.66 125.33 14.09 99.9645 0.0537 14.09 99.9645 0.0537

32QAM0.85

202.48 101.24 16.93 99.9827 0.0182 16.93 99.9827 0.0182

16QAM0.79

149.70 74.85 21.13 99.9935 0.0107 21.13 99.9935 0.0107

8PSK0.80

113.74 56.87 22.95 99.9956 0.0021 22.95 99.9956 0.0021

QPSK0.80

75.72 37.86 30.09 99.9991 0.0035 30.09 99.9991 0.0035







Link Distance 16.017 miles (25.7 km)

In comparison to the fxed mode, the link can now reach 16 miles (25.7 km) with an average throughput o

170 Mbps. During deep ade conditions, the link can run on a lower modulation at lower throughput while

keeping the link availability at 99.999%.

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PAGE

Motorolas Approach to ACMWith more than six years o experience in implementing ACM on the PTP 500 and PTP 600 unlicensed

radios, we have developed considerable expertise in this area. We know how to engineer hitless and

errorless technology with smooth, high-speed modulation shits. Equally important, ease o use has

always been a paramount objective or all our Wireless Network Solutions.

In particular, the ACM provided with PTP 800 Licensed Ethernet Microwave solutions has severaladvantages over comparable systems, including:

Support or QPSK, 8PSK, 16/32/64/128 QAM, 256 QAM with 0.83 coding rate and 256 QAM with 0.91

coding rate up to eight levels o modulation and coding.

Hitless and errorless modulation no bit errors or suspension o trafc ow during shiting

Flexible control operators can defne the maximum and minimum modulation modes

Fast shiting ACM can cope with up to 100 dB/sec ading change

Easy setup The installation wizard guides operators through a quick confguration procedure. Because

the regulatory rules have been embedded into the link installation wizard, you do not have to worry about

violating licensing rules when ACM is enabled. Ater initial setup, no urther user intervention is required.

Fast, accurate link planning With PTP LINKPlanner, both the Fixed and ACM modes are supported. Plus

LINKPlanner includes many sophisticated eatures that greatly reduce link planning man-hours and allow

you to easily review and compare perormance parameters to confgure the solution which best meets

your requirements.

Figure 15:PTP LINKPlanner with ACM


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Motorola, Inc., 1303 E. Algonquin Road, Schaumburg, Illinois 60196 U.S.A. www.motorola.com/ptp

MOTOROLA and the Stylized M Logo are registered in the U.S. Patent and Trademark Ofce. All other product or service names are the property o their respective owners.

Motorola Inc 2010 All rights reserved

Summary

The principle o Adaptive Coding and Modulation is simple: to enable uninterrupted communications

in poor RF conditions and increase throughput during good RF conditions. ACM accomplishes that by

automatically adjusting modulation and/or coding rates to adapt to changes in environmental conditions. In

poor conditions, ACM will automatically shit the modulation and/or coding rate to a lower level to maintain

an uninterrupted ow o data, voice and video communications. In good conditions, ACM will shit the

modulation and/or coding rate to a higher level to deliver aster throughput. In contrast, systems operatingin a Fixed Modulation mode are designed or worst-case conditions, resulting in less efcient utilization o

the spectrum.

ACM can oer signifcant benefts, including:

Maximized spectrum efciency

Increased link capacity

Improved link availability

Reduced antenna size

Extended link distance

In addition, Motorolas ACM experience and expertise can help you deploy the best solution or your

individual situation. Easy-to-use link planning and deployment tools are great time savers or wireless

network stas that are already stretched too thin.

These benefts can help you stretch your wireless dollar much urther and help your Motorola PTP 800

solutions work much smarter.

Wireless Network SolutionsMotorola delivers seamless connectivity that puts real-time inormation in the hands o users, giving

customers the agility they need to grow their business or better protect and serve the public. Working

seamlessly together with its world-class devices, Motorolas unrivalled wireless network solutions include

indoor WLAN, outdoor wireless mesh, point-to-multipoint, point-to-point networks and voice over WLAN

solutions. Combined with powerul sotware or wireless network design, security, management and

troubleshooting, Motorolas solutions deliver trusted networking and anywhere access to organizations

across the globe.

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Adaptative Code Modulation