GE MDS DS SERIES4 User Manual

Microwave Data Systems

MDS FOUR.9 Series

Digital Radio System

User Reference and Installation Guide

PRELIMINARY

Part No. 05-4561A01, Rev. A

Date: 9 JUNE 2006

This book and the information contained herein is the proprietary and confidential information of Microwave Data Systems Inc. that is provided by Microwave Data Systems

exclusively for evaluating the purchase of Microwave Data Systems Inc. technology and is protected by copyright and trade secret laws.

No part of this document may be disclosed, reproduced, or transmitted in any form or by any means, electronic or mechanical, for any purpose without the express written permission of Microwave Data Systems Inc.

For permissions, contact Microwave Data Systems Inc. Marketing Group at 1-585-241-5510 or 1-585-

242-8369 (FAX).

Notice of Disclaimer

The information and specifications provided in this document are subject to change without notice. Microwave Data Systems Inc. reserves the right to make changes in design or components as progress in engineering and manufacturing may warrant.

The Warranty(s) that accompany Microwave Data Systems Inc., products are set forth in the sales agreement/contract between Microwave Data Systems Inc. and its customer. Please consult the sales agreement for the terms and conditions of the Warranty(s) proved by Microwave Data Systems Inc. To obtain a copy of the Warranty(s), contact your Microwave Data Systems Inc. Sales Representative at 1-585-241-5510 or 1-585-242-8369 (FAX).

The information provided in this Microwave Data Systems Inc., document is provided “as is” without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability, fitness for a particular purpose, or non-infringement. Some jurisdictions do not allow the exclusion of implied warranties, so the above exclusion may not apply to you.

In no event shall Microwave Data Systems Inc. be liable for any damages whatsoever – including special, indirect, consequential or incidental damages or damages for loss of profits, revenue, use, or data whether brought in contract or tort, arising out of or connected with any Microwave Data Systems Inc., document or the use, reliance upon or performance of any material contained in or accessed from this Microwave Data Systems Inc. document. Microwave Data Systems’s license agreement may be provided upon request. Additional Terms and Conditions will be finalized upon negotiation or a purchase.

The above information shall not be constructed to imply any additional warranties for Microwave Data Systems Inc. equipment including, but not limited to, warranties of merchantability or fitness for an intended use.

Trademark Information

Software Defined Indoor Unit

Java

is a trademark of Sun Microsystems Inc.

(SDIDUTM) is a product and trademark of CarrierComm Inc.

Windows® is a registered trademark of Microsoft Corporation

All other brand or product names are trademarks or registered trademarks of their respective companies or organizations.

Table of Contents

1 SAFETY PRECAUTIONS ......................................................................................................................1-1

2 SYSTEM DESCRIPTION .......................................................................................................................2-1

2.1 About This Manual............................................................................................................................2-1

2.2 Introduction.......................................................................................................................................2-1

2.3 System Features ...............................................................................................................................2-4

2.4 Physical Description ........................................................................................................................2-5

2.4.1 Model Types ................................................................................................................................2-6

2.4.2 Options ........................................................................................................................................2-7

2.4.3 Front Panel Indicators .................................................................................................................2-7

2.4.4 Front Panel Connections .............................................................................................................2-8

2.5 System Description ........................................................................................................................2-12

2.6 Consecutive Point Architecture ....................................................................................................2-15

2.7 2 + 0 (East-West) Configuration ....................................................................................................2-17

2.8 1+1 Protection .................................................................................................................................2-18

2.9 1 + 1 Multi-hop Repeater Configuration .......................................................................................2-19

2.10 Data Interfaces ................................................................................................................................2-21

2.11 Power Management ........................................................................................................................2-21

2.12 MDS FOUR.9 Series Software and Network Management..........................................................2-22

3 INSTALLATION .....................................................................................................................................3-1

3.1 Unpacking..........................................................................................................................................3-1

3.2 Notices...............................................................................................................................................3-2

3.3 Required Tools..................................................................................................................................3-2

3.3.1 SDIDUTM Tools ............................................................................................................................3-2

3.3.2 ODU Tools...................................................................................................................................3-2

3.4 PRE-INSTALLATION NOTES ...........................................................................................................3-3

3.5 Overview of Installation and Testing Process...............................................................................3-3

3.6 Site Evaluation ..................................................................................................................................3-5

3.6.1 Preparing for a Site Evaluation....................................................................................................3-6

3.6.2 Site Evaluation Process...............................................................................................................3-7

3.6.3 Critical System Calculations ......................................................................................................3-12

3.6.4 Frequency Plan Determination..................................................................................................3-13

3.6.5 Antenna Planning ......................................................................................................................3-14

3.6.6 ODU Transmit Power Setup......................................................................................................3-15

3.6.7 Documenting a Site Evaluation .................................................................................................3-16

3.7 Installation of the MDS FOUR.9 Series.........................................................................................3-19

3.7.1 Installing the MDS FOUR.9 Series Software Defined IDUTM....................................................3-19

3.7.2 Installing the MDS FOUR.9 Series ODU...................................................................................3-20

3.7.3 Routing the ODU/ SDIDUTM Interconnect Cable .......................................................................3-22

3.8 Quick Start Guide ...........................................................................................................................3-24

3.8.1 Materials Required ....................................................................................................................3-24

3.8.2 Grounding the ODU...................................................................................................................3-24

3.8.3 Grounding the SDIDUTM............................................................................................................3-26

3.8.4 Connecting the SDIDUTM to the PC and Power Source............................................................3-26

3.8.5 SDIDUTM Configuration..............................................................................................................3-27

3.8.6 ODU Antenna Alignment ...........................................................................................................3-29

3.8.7 Quick Start Settings...................................................................................................................3-30

3.9 Documenting MDS FOUR.9 Series Configuration.......................................................................3-31

4 SUMMARY SPECIFICATION ................................................................................................................4-1

5 FRONT PANEL CONNECTORS ...........................................................................................................5-1

5.1 DC Input (Power) Connector............................................................................................................5-1

5.2 Ethernet 100BaseTX Payload Connector 1-2.................................................................................5-1

4.9 SONET Payload Connector..............................................................................................................5-2

5.4 STM-1 Payload Connector ...............................................................................................................5-2

5.5 DS-3/E-3/STS-1 Payload Connector................................................................................................5-2

5.6 NMS 10/100BaseTX Connector 1-2 .................................................................................................5-3

5.7 Alarm/Serial Port Connector............................................................................................................5-3

5.8 ODU Connector.................................................................................................................................5-4

5.9 T1- Channels 1-2 Connector............................................................................................................5-4

5.10 T1- Channels 3-16 Connector..........................................................................................................5-5

5.11 USB ....................................................................................................................................................5-7

5.12 Voice Order Wire...............................................................................................................................5-8

5.13 Data Order Wire ................................................................................................................................5-8

6 APPENDIX .............................................................................................................................................6-1

6.1 Alarm Descriptions...........................................................................................................................6-1

6.2 Abbreviations & Acronyms............................................................................................................6-14

1 Safety Precautions

PLEASE READ THESE SAFETY PRECAUTIONS!

RF Energy Health Hazard

The radio equipment described in this guide uses radio frequency transmitters. Although the power level is low, the concentrated energy from a directional antenna may pose a health hazard.

Do not allow people to come closer than 119 cm (47.2) to the front of the antenna while the transmitter is operating. The antenna must be professionally installed on a fixed-mounted outdoor permanent structure to provide separation from any other antenna and all persons as detailed in this manual.

Protection from Lightning

Article 810 of the US National Electric Department of Energy Handbook 1996 specifies that radio and television lead-in cables must have adequate surge protection at or near the point of entry to the building. The code specifies that any shielded cable from an external antenna must have the shield directly connected to a 10 AWG wire that connects to the building ground electrode.

Warning – This is a Class A product

Warning – This is a Class A product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures.

Warning – Turn off all power before servicing

Warning – Turn off all power before servicing this equipment.

Safety Requirements

Safety requirements require a switch be employed between the SDIDU™ external power supply and the SDIDU™ power supplies.

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User Reference and Installation Guide 1-2

Proper Disposal

The manufacture of the equipment described herein has required the extraction and use of natural resources. Improper disposal may contaminate the environment and present a health risk due to the release of hazardous substances contained within. To avoid dissemination of these substances into our environment, and to lessen the demand on natural resources, we encourage you to use the appropriate recycling systems for disposal. These systems will reuse or recycle most of the materials found in this equipment in a sound way. Please contact Microwave Data Systems or your supplier for more information on the proper disposal of this equipment.

05-4561A01, Rev. A

2 System Description

2.1 About This Manual

This manual is written for those who are involved in the “hands-on” installation of the MDS FOUR.9 Series Digital Transceiver, such as installation technicians, site evaluators, project managers, and network engineers. It assumes the reader has a basic understanding of how to install hardware, use Windows based software, and operate test equipment.

The MDS FOUR.9 Series includes a Software Defined Indoor Unit (ODU). The SDIDU

is a product and trademark of CarrierComm.

(SDIDUTM) and outdoor unit

2.2 Introduction

The Microwave Data Systems family of digital radios provides high capacity transmission, flexibility, features, and convenience for wireless digital communications networks. The Microwave Data Systems digital point-to-point radios represent a new microwave architecture that is designed to address universal applications for both PDH and SDH platforms. This advanced technology platform is designed to provide the flexibility to customers for their current and future network needs.

The Microwave Data Systems radio family is based upon a common platform to support a wide range of network interfaces and configurations. It supports links for 16 x E1/T1, 100BaseTX Ethernet, and DS-3/E-3/STS-1 (optional, consult factory for availability). The radio family is spectrum and data rate scalable, enabling service providers or organizations to trade-off system gain with spectral efficiency and channel availability for optimal network connectivity. The Microwave Data Systems digital radio family enables network operators (mobile and private), government and access service provides to offer a portfolio of secure, scalable wireless applications for data, video, and Voice over IP (VoIP).

The MDS FOUR.9 Series digital radio family operates in the FCC Public Safety Band of 4.940 to

4.990 GHz, which is generically referred to as the “4.9 GHz band.” The MDS FOUR.9 Series supports three types of user data payload connectivity as follows:

• 100Base-TX intelligent bridging between two locations without the delay and expense of installing cable or traditional microwave.

• Scalable Ethernet capability of 25 and 50 Mbps is included. These scalable radios provide LAN connectivity and offer performance trade-offs between operational bandwidths, data rates, and distance.

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User Reference and Installation Guide 2-2

• 16E1 or T1 for cellular backhaul, enterprise voice applications and voice network redundancy

For customers such as cellular carriers requiring backhaul and backbone extension as well

as service providers requiring network redundancy, new Points of Presence (POPs), and last mile access, the MDS FOUR.9 Series radio is a cost effective alternative to leased lines with carrierclass quality of performance. The MDS FOUR.9 Series is a cost effective solution to meet the growing demand for enterprise Local Area Network (LAN) connectivity between buildings and campuses as well as service providers requiring reliable products for infrastructure expansion, extending Metropolitan Area Network (MAN) fiber access, and network redundancy.

The MDS FOUR.9 Series includes integrated Network Management functionality and design features enabling simple commissioning when the radio network is initially set up in the field at the customer’s premises. Furthermore, a highlight of MDS radio products is scalability and the capability to support a ring-type architecture. This ring or consecutive point radio architecture is self-healing in the event of an outage in the link and automatically re-routes data traffic, thereby ensuring that service to the end user is not interrupted.

The MDS FOUR.9 Series is composed of a Software Defined Indoor Unit

(SDIDUTM) and Outdoor Unit (ODU). It supports 1+0 and 1+1 protection and ring architectures in a single 1 RU chassis. The modem and power supply functions are supported using easily replaceable plug-in modules. An additional feature of the SDIDU

is provision for a second plug-in modem/IF

module to provide repeater or east/west network configurations.

The overall architecture consists of a single 1RU rack mount Software Defined Indoor Unit

SDIDU

(

) with a cable connecting to an Outdoor Unit (ODU) with an external antenna.

Core Access

Network

Outdoor

Outdoor Unit

Unit

Outdoor

Unit

Outdoor Unit

Indoor Unit

Outdoor Unit

Outdoor

Unit

Figure 2-1. MDS FOUR.9 Series SDIDUTM and ODU Architecture

Indoor Unit

145H142HTable 2-1 lists key features that MDS FOUR.9 Series technology offers to those involved in the

design, deployment and support of broadband fixed wireless networks.

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User Reference and Installation Guide 2-3

Table 2-1 Key Benefits and Advantages of MDS FOUR.9 Series Radios

Benefits Advantages to Providers/Customers Reference

Wireless license-exempt system

ISM bands do not require expensive

Fast return on investment.

license band fees or incur licensing delays.

Lower total cost of total ownership. Wireless connectivity supplements existing cable (Ethernet).

Media diversity avoids single points of

failure.

Easy to install units

Straightforward modular system enables

Fast return on investment. fast deployment and activation.

No monthly leased line fees. Carrier-class reliability.

Complete support of payload capacity with additional wayside channels

Aggregate capacity beyond basic payload

Increases available bandwidth of network. (34 Mbps or 50 Mbps or 100 Mbps).

Allows customer full use of revenueScalable and spectrally efficient system.

Separate networks for radio overhead/management and user payload.

generating payload channel.

Up to 16 T1/E1 wayside channels supports

extension of PBX connectivity between

buildings without additional leased-line

costs.

146H143H2.2 –147H144H2.4

148H145H3.5

149H146H2.2– 150H147H2.5

Lowers total cost of ownership.

Ring Architecture

Supports a ring (consecutive point)

Enables network scalability.

2.6,2.7,2.9 configuration, thus creating a self-healing redundancy that is more reliable than traditional point-to-point networks.

Increases deployment scenarios for initial deployment as well as network expansion

with reduced line-of-sight issues. In the event of an outage, traffic is automatically rerouted via another part of the ring without service interruption.

Ring/consecutive point networks can overcome line-of-sight issues and reach

Increases network reliability due to self-

healing redundancy of the network.

Minimizes total cost of ownership and

maintenance of the network. more buildings than other traditional wireless networks.

Allows for mass deployment.

Networks can be expanded by adding more MDS FOUR.9 Series

units or more

rings without interruption of service.

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User Reference and Installation Guide 2-4

Benefits Advantages to Providers/Customers Reference

A separate management channel allows for a dedicated maintenance ring with connections to each radio on the ring.

Adaptive Power Control

Automatically adjusts transmit power in discrete increments in response to RF interference. For EIRP compliance, the power output is limited to the maximum established at the time of installation, per FCC Part 90 rules.

Comprehensive Link/Network Management Software

A graphical user interface offers security, configuration, fault, and performance management via standard craft interfaces.

Suite of SNMP-compatible network management tools that provide robust local and remote management capabilities.

Enables dense deployment.

Simplifies deployment and network

management.

Simplifies management of radio network

and minimizes resources as entire network

can be centrally managed from any

location.

Simplifies troubleshooting of single radios,

links, or entire networks.

Simplifies network upgrades with remote

software upgrades.

Allows for mass deployment.

2.3 System Features

2.11

2.12



Selectable Rates and Interfaces

o Up to 16 x E1/T1 (wayside channels)

100BaseTX/Ethernet: Scalable 25-100 Mbps

DS-3/E-3/STS-1 (option; consult factory for availability)

 Support for multiple configurations

o 1+0, 1+1 protection/diversity

o Hot Standby

o East/West Repeater (2 + 0)

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User Reference and Installation Guide 2-5

 Selectable Spectral Efficiency of 0.8 to 6.25 bits/Hz (including FEC and spectral shaping

effects)

QPSK, 16 – 64 QAM Modulation



Powerful Trellis Coded Modulation concatenated with Reed-Solomon Error Correction



Built-in Adaptive Equalizer

 Support of Voice Orderwire Channels



Peak output power at antenna port

24.4 dBm at 4.9 GHz (High Power)

17.1 dBm at 4.9 GHz (Low Power)

Receive Sensitivity: -84 dBm to -72 dBm (depending on data rate/modulation/FEC/ODU)



 Adaptive Power Control—Adjusts power output to account for changing path

conditions. Power is limited to the maximum established at the time of installation, per FCC Part 90.



Built-in Network Management System (NMS)

 Consecutive Point ring architecture



Built-in performance statistics

Built-in Bit Error Rate (BER) performance monitoring

Data encryption of all payload data and T1/E1 wayside channels for MDS FOUR.9



Series-100 and MDS FOUR.9 Series-50 Ethernet models (Consult factory for availability)

2.4 Physical Description

The following section details the physical features of the MDS FOUR.9 Series digital radios

• Model types

• Front panel indicators

• Front panel connections

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User Reference and Installation Guide 2-6

2.4.1 Model Types

158H155HTable 2-2 lists the MDS FOUR.9 Series digital radios according to model number and associated

capabilities of throughput, data interface, and wayside channel.

Table 2-3 lists the ODU model numbers.

Table 2-2 MDS FOUR.9 Series SDIDUTM Model Types

159H156H

PRODUCT NAME MODEL NUMBER FULL DUPLEX

THROUGHPUT

4.9 GHz: MDS

FOUR.9 Series

SDIDU49MNVN

100 Mbps

Aggregate

4.9 GHz: MDS

FOUR.9 Series

SDIDU49MPVN 100 Mbps

(50 Mbps full

duplex)

Aggregate

(50 Mbps full

duplex), 1+1

Protection or 2+0

4.9 GHz: MDS

FOUR.9 Series

SDIDU49MNCN 200 Mbps

Aggregate

(100 Mbps full

4.9 GHz: MDS

FOUR.9 Series

SDIDU49MPCN 200 Mbps

duplex)

Aggregate

INTERFACE

100 BaseTX

DATA

WAYSIDE

Two

T1/E1s

Two

T1/E1s

Two

T1/E1s

Two

T1/E1s

(100 Mbps full

duplex), 1+1

1-16xE1/T1

Scalable

Ethernet, 2

Mbps

4.9 GHz: MDS

FOUR.9 Series

Protection or 2+0

SDIDU49MNTN 68 Mbps Aggregate

(34 Mbps full

duplex) + scalable

1-16xE1/T1

Scalable

Ethernet, 2

Mbps

4.9 GHz: MDS

FOUR.9 Series

ethernet

SDIDU49MPTN 72 Mbps Aggregate

(36 Mbps full

duplex), 1+1

Protection or 2+0

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User Reference and Installation Guide 2-7

Table 2-3 MDS FOUR.9 Series ODU Model Types

PRODUCT NAME MODEL NUMBER ANTENNA

MDS FOUR.9-ODU53e ODU4900MEP External antenna required

2.4.2 Options

The following items are also available:

• AC/DC power supply

• Data Encryption

• Upgrade 50Mbps Ethernet systems to 100Mbps capability

• OC-3/STM-1 Mini-IO Module

Please consult the factory for more information.

2.4.3 Front Panel Indicators

All models of the MDS FOUR.9 Series support a variety of front panel configurations that are dependent on the network interface and capacity configurations.

160H157HFigure 2-2 provides an example of the MDS FOUR.9 Series 1+0 configuration and the

associated LEDs displayed on the

SDIDU

modem card have a status LED.

Figure 2-2. MDS FOUR.9 Series LEDs: SDIDUTM Front Panel Configuration for 1+0

front panel. The controller, standard I/O, and each

Configuration

The modem status LED indicates the modem status as described in Table 2-4.

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User Reference and Installation Guide 2-8

Table 2-4. Modem status LED.

LED STATUS

Green

Orange

Flashing Green

Flashing Orange

Standby Locked Link (1+1 Non-Diversity Only)

Active Locked Link

Low SNR

Unlocked

The controller status LED is the primary front panel indicator of alarms. An alarm is generated when a specific condition is identified and is cleared when the specified condition is no longer detected. When an alarm is posted,

1. The controller status LED turns orange for 5 seconds

2. The controller status LED turns off for 5 seconds

3. The controller status LED flashes orange the number of times specified by the first digit of the alarm code

4. The controller status LED turns off for 3 seconds

5. The controller status LED flashes orange the number of times specified by the second digit of the alarm code

Steps 2-5 are repeated for each alarm posted. The entire process is repeated as long as the alarms are still posted.

The standard I/O and modem status LEDs are set to red when certain alarms are posted. A complete list of alarms is provided in Appendix

161H158H6.1.

The alarm description is also displayed in the Graphical User Interface (GUI) as described in the User Interface Reference Manual.

2.4.4 Front Panel Connections

Please refer to the

162H159HFigure 2-3 for an example of a MDS FOUR.9 Series SDIDU

followed by a descriptive text of the connections.

front panel

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User Reference and Installation Guide 2-9

Figure 2-3. MDS FOUR.9 Series, 1+1 Protection: SDIDUTM Front Panel Connections

05-4561A01, Rev. A

User Reference and Installation Guide 2-10

Power Supply Input

DC Input

-48 VDC

-48v (Isolated Input); 2-pin captive power connector. The unit requires an input of -48 volts dc ±10% at the front panel DC Input connector. The total required power is dependent on the option cards and protection configuration (1+0, 1+1). The SDIDU

front panel power connector pin numbering is 1 through 2, from left to right, when facing the unit front panel. Pin 1 is the power supply return and is connected to unit chassis ground internally. Pin 2 should be supplied with a nominal -48 V dc, with respect to the unit chassis (ground). A ground-isolated supply may be used, provided it will tolerate grounding of its most positive output.

The recommended power input is -44 to -52 V dc at 2 Amps minimum. It is recommended that any power supply used be able to supply a minimum of 100 Watts to the SDIDU

A mating power cable connector is supplied with the SDIDU

. It is a 2-pin plug, 5 mm pitch, manufactured by

Phoenix Contact, P/N 17 86 83 1 (connector type MSTB 2,5/2-STF). This connector has screw clamp terminals that accommodate 24 AWG to 12 AWG wire. The power cable wire should be selected to provide the appropriate current with minimal voltage drop, based on the power supply voltage and length of cable required. The recommended wire size for power cables under 10 feet in length supplying

-48 Vdc is 18 AWG.

The SDIDU the ODU/SDIDU not have a power on/off switch. When DC power is connected to the SDIDU

supplies the ODU with all required power via

Interconnect cable. The SDIDUTM does

, the digital radio powers up and is operational. There can be up to 204 mW of RF power present at the antenna port (external antenna version). The antenna should be directed safely when power is applied.

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User Reference and Installation Guide 2-11

Alarm/Serial Interface

Alarms/Serial DB-15HD female connector for two Form-C relay alarm

outputs (rated load: 1A @ 24 VDC), two TTL alarm outputs, four TTL alarm inputs, and Serial Console. The two Form-C relay alarm outputs can be configured to emulate TTL alarm outputs.

USB Interface

USB USB connector, optional.

Voice Orderwire Connector

Voice Orderwire Call

Voice

Call button to alert operator at link-partner SDIDU incoming Voice-Orderwire call.

RJ-11 modular port connector for voice orderwire interface.

Orderwire

NMS 10/100 Network Management System Connections

NMS 10/100 1 10/100Base-TX RJ-45 modular local port connector for

access to the Network Management System (SNMP) and GUI.

NMS 10/100 2 10/100BaseTX RJ-45 modular remote port connector for

access to the Network Management System (SNMP). This port to be used for consecutive point networks.

100/Ethernet Models: Ethernet 100BaseT Connections

USER 10/100 1 100Base-TX RJ-45 modular port connector for the local Fast

Ethernet interface.

USER 10/100 1 100Base-TX RJ-45 modular port connector. This port to be

used for consecutive point networks.

T1 Channels

T1 1-2 Two T1/E1 (RJ-48C) interface connections.

T1 3-16 Fourteen T1/E1 high density interface connector

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User Reference and Installation Guide 2-12

2.5 System Description

The overall digital radio architecture consists of a single 1RU rack mount Software Defined Indoor

(SDIDUTM) with a cable connecting to an Outdoor Unit (ODU). The 4.9 GHz ODU is

Unit designed for use with an external antenna only. This SDIDU advantageous when compared to a single IDU with external mount antenna, since supporting a signal of 4.9 GHz from the IDU rack to the antenna will result in significant signal degradation, which would require expensive coaxial cable or waveguide.

/ODU architecture is

163H160HFigure 2-4 shows the SDIDU

partitions for the I/O, Modem/IF, and power supply modules are shown. The SDIDU

and interfaces from a functional point of view. The functional

comes with the standard I/O capability that can be upgraded. In addition, the Modem/IF function is modular. This allows the addition of a second Modem to support protection or ring architectures. The power supply is similarly modular.

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User Reference and Installation Guide 2-13

IDU

Modem Control

Telemetry

East/Primary Modem

MODEM/

FEC ASIC

West/Secondary Modem

MODEM/

FEC ASIC

Secondary Power

Digital

Primary Power

Supply

Multiplexed

Quad

Mux

-48Vdc

Quad

Mux

-48Vdc

Multiplexed

-48Vdc

2x 100 Mbps

16x 1.544/2.048

Mbps

155.52 Mbps

4x44.736/34.368/

51.84 Mbps

2x 155.52 Mbps

4x44.736/34.368/

51.84 Mbps

IDU

CONTROLLER

SNMP 2x

100Base-Tx

User 2x

100Base-Tx

16 T1/E1

64 kbps

Voice

Standard I/O Car ds

Optional I/O Ca rds

(Small Slot)

STM-1/OC3

DS-3/ES/

STS-1

Optional I/O Cards

(Large Slot)

2xSTM-1/

OC3

4xDS3/ES/

STS1

Future

CPU

Switch

Serial

RCH Serial

FRAMER

ODU

Vertical

Antenna

350

TNC

Quad

Mux

MHz

-48Vdc

5/10

MHz

140

Transmitter

Up-Converter

Receiver

Down-Converter

DC/DC

Converters

Commlink

& Processor

5.3/

5.8

GHz

+10Vdc

+5Vdc +3Vdc

-5Vdc

Figure 2-4. MDS FOUR.9 Series System Block Diagram

The SDIDUTM interfaces with the ODU to receive and provide modulated transmit and receive waveforms. The SDIDU

interfaces provide Fast Ethernet 100Base-T (MDS FOUR.9 Series-

100) connections to the network. Contact factory for availability of SONET OC-3 (MDS FOUR.9 Series-155) connections. In addition, two E1/T1 channels are provided for PBX extension. SNMP is provided on 10/100BaseT ports.

Transfer

Switch

Duplexer

Diversity

Switch

Internal/

Horizontal

Antenna

BNC

05-4561A01, Rev. A

N-type

External Antenna

RSL

(Received

Signal Level)

Voltage

User Reference and Installation Guide 2-14

The ODU RF Up/Down Converter card provides the interface to the antenna. The transmit section up-converts and amplifies the modulated Intermediate Frequency (IF) of 350 MHz from the IF Processor and provides additional filtering. The receive section down converts the received signal, provides additional filtering, and outputs an IF of 140 MHz to the IF Processor. The 64-QAM Modem performs the modulation and demodulation of the payload and forward error correction using advanced modulation and coding techniques. Using all-digital processing, the 64-QAM Modem uses robust modulation and forward error correction coding to minimize the number of bit errors and optimize the radio and network performance. The 64-QAM Modem also scrambles, descrambles and interleaves/deinterleaves the data stream in accordance with Intelsat standards to ensure modulation efficiency and resilience to sustained burst errors. The modulation will vary by application, data rate, and frequency spectrum. The highest order modulation mode supported is 64 Quadrature Amplitude Modulation (QAM).

164H161HTable 2-5

summarizes the TCM/convolutional code rates for each modulation type supported by the MDS FOUR.9 Series.

Table 2-5. MDS FOUR.9 Series TCM/Convolutional Code Rates

Modulation Type Available Code

Rates

QPSK 1/2, 3/4, 7/8

16-QAM 3/4, 7/8, 11/12

32-QAM 4/5, 9/10

64-QAM 5/6, 11/12

The major functions of the SDIDUTM can be summarized as follows:

• I/O Processing – The SDIDU

comes with a standard I/O capability that includes support for up to 16xT1/E1 and 2x100Base-TX user payloads, 2x100Base-TX for SNMP, and voice orderwire. In addition, option cards for DS-3/E3/STS-1, 1-2 x STM-1/OC-3, and 4xDS-3/E3/STS-1 may be added. The SDIDU

architecture is flexible and allows for the addition of other I/O types in the

future.

• Switch/Framing – The SDIDU

includes an Ethernet Switch and a proprietary Framer that are designed to support 1+1 protection switching, ring architecture routing, and overall network control functions.

• Network Processor – The SDIDU

includes a Network Processor that performs SNMP and

Network Management functions.

• Modem/IF – The SDIDU

Modem performs forward-error-correction (FEC) encoding, PSK/QAM modulation and demodulation, equalization, and FEC decoding functions. The IF chain provides a 350 MHz carrier, receives 140 a MHz carrier, processes OOK telemetry, and provides –48V power. Two modems can be used for 1+1 protection or ring architectures.

• Power Supply – The SDIDU

power supply accepts -48 Vdc and supplies the SDIDUTM and ODU

with power. A second redundant power supply may be added as an optional module.

The Modem Processor and its associated RAM, ROM, and peripherals control the digital and analog Modem operation. It also provides configuration and control for both the IF and I/O cards.

The

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SDIDU

interfaces with the ODU to receive and provide modulated transmit and receive

waveforms.

The SDIDUTM also provides the physical interface for the user payload and network management. In transmit mode, the Framer merges user payload with radio overhead-encapsulated network management data. This combined data stream is transmitted without any loss of user bandwidth. In the receive mode, the Framer separates the combined data stream received from the 64-QAM Modem. The SDIDU 100BaseT data interface port. The SDIDU

supports Scalable Ethernet data rates, such as 25 or 50 Mbps via the

provides network management data on 10 Mbps ports accessible via the 10/100BaseTX port. The Central Processor Unit (CPU) provides the embedded control and network element functionality of the NMS. The CPU also communicates with other functions within the SDIDU

for configuration, control, and status monitoring.

In Ethernet models, the payload of each user Ethernet data packet and all T1 can be encrypted using an AES encryption algorithm. In addition, the encryption engine is re-seeded with a new, randomly generated key stream every 10 seconds, in order to provide enhanced security. The initial key is based off of a pass phrase entered into each MDS FOUR.9 Series unit by the network administrator. Consult factory for the availability of this encryption function.

The power supply converts -48 Vdc to the DC voltage levels required by each component in the system.

2.6 Consecutive Point Architecture

The consecutive point network architecture is based upon the proven SONET/SDH ring. Telecommunications service providers traditionally use the SONET/SDH ring architecture to implement their access networks. A typical SONET/SDH network consists of the service provider’s Point of Presence (POP) site and several customer sites with fiber optic cables connecting these sites in a ring configuration (see deliver high bandwidth with high availability to their customers.

165H162HFigure 2-5). This architecture lets providers

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Figure 2-5. Ring Configuration.

SONET/SDH rings are inherently self-healing. Each ring has both an active path and a standby path. Network traffic normally uses the active path. Should one section of the ring fail, the network will switch to the standby path. Switchover occurs in seconds. There may be a brief delay in service, but no loss of payload, thus maintaining high levels of network availability.

The consecutive point architecture implemented in the MDS FOUR.9 Series Digital Radio family is based on a point-to-point-to-point topology that mimics fiber rings, with broadband wireless links replacing in-ground fiber cable. A typical consecutive point network consists of a POP and several customer sites connected using MDS FOUR.9 Series units. These units are typically in a building in an east/west configuration. Using east/west configurations, each unit installed at a customer site is logically connected to two other units via an over-the-air radio frequency (RF) link to a unit at an adjacent site.

Each consecutive point network typically starts and ends at a POP. A pattern of wireless links and in-building connections is repeated at each site until all buildings in the network are connected in a ring as shown in need to be jumpered between two SDIDU there is a single SDIDU

166H163HFigure 2-6. . For 2 x 1+0 and 2 x 1+1 nodes payload and NMS connections

. For SDH or SONET payloads, the configuration is similar but an

s. For 1 x 2+0 nodes, there is no need for jumpers as

external add/drop mux and a second SDH/SONET interface card are required.

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Figure 2-6. Consecutive Point Network

2.7 2 + 0 (East-West) Configuration

The SDIDUTM supports an east/west, or 2+0, configuration that allows a consecutive point architecture to be achieved with only a single 1 RU chassis at each location. In this configuration the SDIDU is referred to as the west modem and the other as the east modem. The SDIDU to two ODUs, one broadcasting/receiving in one direction of the ring architecture and the other broadcasting/receiving in the other as shown in Figure 2-7.

contains two modems supplies and may contain two power supplies. One modem

is connected

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Connected to

west modem

Connected to

east modem

Connected to

east modem

Connected to

east modem

Connected to

west modem

Connected to

west modem

Connected to east modem

Connected to

west modem

Figure 2-7. 2+0 (East-West) configuration.

2.8 1+1 Protection

The MDS FOUR.9 Series supports 1+1 protection as an option for a critical link. In this configuration, protection is provided in a single 1 RU chassis. The SDIDU supplies and two modems. The power supply, ODU, IF/telemetry and modem are protected. The digital framing and LIUs are not. One modem is referred to as the west modem and the other as the east modem. 1+1 protection can be run in two modes called diversity and non-diversity.

In diversity mode, the link between each pair of modems is the same, as shown in providing complete redundancy. This arrangement requires bandwidth for both links and noninterference between the links, but it provides hitless receive and transmit switching. The SDIDU

supports both frequency and spatial diversity. In frequency diversity, two frequencies are used. In spatial diversity, two non-interfering paths are used. In either case, the proprietary framer chooses the best, or error-free, data stream and forwards it to the Line Interface Units (LIUs).

contains two power

168H165HFigure 2-8,

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Connected to

west modem

Connected to east modem

Connected to

west modem

Connected to

east modem

Figure 2-8. 1+1 protection in diversity mode

169H166HFigure 2-9 shows operation in non-diversity mode. In this mode, one ODU at each location

transmits to both two ODUs at the other location. This mode does not require the extra bandwidth or interference protection of diversity mode. It provides hitless receive switching and hot standby. The SDIDU

automatically switches transmit ODU upon appropriate ODU alarm or

ODU interface error, minimizing transmit outage time.

Connected to

west modem

Connected to

west modem

Connected to east modem

Connected to

east modem

Figure 2-9. 1+1 protection in non-diversity mode

2.9 1 + 1 Multi-hop Repeater Configuration

The MDS FOUR.9 Series supports a 1 + 1 multi-hop repeater configuration with drop/insert capability as shown in described in section architecture as described in section dropped or inserted. Front panel connections for drop/insert capability are shown in In this configuration each SDIDU

171H168HFigure 2-10. This configuration provides individual 1 + 1 link protection as

172H169H2.8, as well as the full-scale protection inherent in the consecutive point

173H170H2.6. At each location within the network, data may be

contains two power supplies and two modems.

174H171HFigure 2-11.

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Protected

Data drop/insert

Link

drop/insert

Protected

Link

Protected

Link

Data

Data drop/insert

Protected

Link

Data drop/insert

Figure 2-10. 1 + 1 Multi-hop Repeater Configuration

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