Digital Microwave Radio For

Arizona

The What

The Why

And the How

Public Safety

What is Microwave ?

•Point to Point Wireless – FCC Part 101

• Private, Secure & Hi-reliability

• Connectivity to 911 Center & Radio Sites

Voice &

Data

Voice &

Data

N.American Asynchronous Standards (Digital)

SignalType

Bit Rate(kbs)

No. ofChannels

Line CodeType

DSO

DS1

DS2

DS3

64

1,544

6,312

44,736

1

24

96

672

AMI

B8ZS AMI

B6ZS

B3ZS

SONET

OC1 Level Rate (Mb/s) Capacity OC-1

51.84

28 DS1’s

OC-3 OC-9

155.52 466.56

84 DS1’s 252 DS1’s

OC-12 OC-18

622.08 933.122

336 DS1’s 504 DS1’s

OC-24 OC-36

1244.16 1866.24

672 DS1’s 1008 DS1’s

OC-48

2488.32

1344 DS1’s

OC-96 4976.64 2688 DS1’s

Analog Hierarchy - example

Ch 1 104-108 KHzCh 2 Ch 3 Ch 4Ch 5Ch 6Ch 7Ch 8Ch 9Ch 10Ch 11Ch 12

Voice Channel

0-4 KHz

Basic Group 60-108 KHz

Basic Group 60-108 KHz

5 Groups 10 Super Groups

Super Group312-552 KHz

Super Group312-552 KHz

4Master Groups564-3084 KHz

4Master Groups564-3084 KHz

564-11404KHz

4 Master

Groups

Base Band

Common Digital Applications

6 X X X X X X X

10 X X X

11 X X X X X X X

18 X X X X X

23 X X X X

38 X X X X

GHz 4DS1 8DS1 16DS1 28DS1 1DS3 3DS3 SONET

The Equipment

RF

Multiplexer

RF

Channel Bank

AntennaPressurization

RF

ModemOrderwire

Alarm Unit PBX Switch

Dispatch Center

LAN

Why microwave? System Performance

• Frequency Bands (FCC)

• Capacity Requirements

• Path Characteristics, length, terrain, climate

• System Reliability

• Radio Equipment Configurations

Path Performance

Frequency < the path length

Capacity (Bandwidth)

Gain – Tx power & Rx level

Loss – Atmospheric conditions & Equipment

Reliability (system gain - net path loss)

Target = 99.999 % reliability, or 315 seconds/ year

911 Center

Radio Site A

Loop & MHSB paths

Radio Site B

Radio Site C

Loop

MHSB

NP

NP

NPEquipment Shelter

Tower

Primary & Emergency Power

Equipment Protection

Tx 1

Rx 1

Modem & Mux

Tx 1

Tx 2

Rx 2

Rx 1

Modem & Mux

MHSBRedundant Tx & Rx

Share same frequencies

Non-ProtectedNo protection failure

Inexpensive

Equipment & Path Protection

Modem & Mux

Tx 1

Tx 2

Rx 2

Rx 1

MHSB/ SD

Multi-path fade improvement

Additional receiver connected to separate antenna

Tx 1

Rx 1

Modem & Mux

Loop- Protection

2 paths per site

RF is NP, Protection is at DS1- level

Tx 1

Rx 1

Equipment & Path Protection

The HowTurnkey Services

• FCC License

• Site Construction

• Factory Integration

• Installation, Test & Acceptance

• System Cutover

• Training, Maintenance, & Warranty

Project Team

Transm ission Engineer System s Engineer

Construction Crew

Civil Engineer

Radio Technicians Antenna Crew

Field Supervisor

Pro ject Engineer

Pro ject M anager

Radio M aintenance Crew

Custom er Service M anager

CLIENT

• Phase I System Definition

• Phase II Specifications Development

• Phase III Procurement Management

• Phase IV Implementation

• Phase V Acceptance

CTA – PROJECT APPROACH

Arizona

CTA COMMUNICATIONS

Established 1984

HQ: Lynchburg, VA

20 Engineers & Staff

Communications

Subsidiary of HSMM:

Major A/E Firm

350 Employees

Ten Offices