Plessey MDR2400-SR User manual

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 1
MDR2400-SR, MDR5800-SR and
Orion 5825-SR
Digital Radios
User Manual
Document Number:

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 2
Issue Status
Issue Revised Pages/Amendments
1 1
2 31
3 2
4 General – terminology definition PER used instead of BER to remove interpretation ambiguity
between Block Error Rate and Bit Error Rate. Note Block (equivalent to packet) concept is still
maintained within sections describing G.826 parameters to maintain consistency with G.826
terminology.
5 MIB Description chapter added, RESET Button Additions, chapter on setup of a serial connection
between a PC/Laptop and the Element Management Port, IP network address description diagrams.
6 Amendments related to customer furnished equipment, Outdoor Unit temperature range update,
Maintenance and Ordering section updates, Appendix added regarding Antennas.
7 Update on RESET Button functionality description, MIB definition additions, product receive sensitivity
level adjustment, FCC notice updates (Warning – this page, Antenna Information – Appendix E), NMS
picture update. Appendix D Indoor Unit firmware Upgrade Notice added. Appendix B MIB Elements
ResetAllRFPerfomanceData and ResetAllG826 deprecated.
8 Added detail for new MDR2400 Outdoor Unit
Added detail for new Indoor Unit – balanced and unbalanced connectors
9 Added detail for Orion 5825 – SR radio (16 QAM radio), 1+1 system. Changed to American English.
Updated MIB as well as NMS, now JAVA based. Support for Windows XP, 2000 added.
Added ftp firmware upload, Appendix G
Added text required by the ATCB with regards to the Orion 5825 – SR.
10 Added additional text required by the ATCB to adhere to FCC requirements.

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 3
FEDERAL COMMUNICATIONS COMMISSION NOTICE
The equipment has been tested and found to comply with the limits for a Class A digital devices, pursuant to Part 15 of the
FCC Rules.
These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in
a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be
required to correct the interference at his own expense.
The manufacturer is not responsible for any radio or TV interference caused by unauthorized modifications to this
equipment. Such modifications could void the user's authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may
not cause interference, and (2) this device must accept any interference, including interference that may cause undesired
operation of the device.
WARNING- To comply with FCC RF exposure
limits, the antennas for this transmitter must be
fix-mounted to provide a separation distance of 2
meters (6.6 ft) or more from all persons to satisfy
RF exposure requirements.
Equipment installation and use
This equipment must be professionally installed. The operator of the spread
spectrum or digitally modulated intentional radiator, or the installer if the equipment
is professionally installed, is responsible for ensuring that the system is used
exclusively for fixed, point-to-point operations.
NOTE 1 The MDR2400 frequency output must be limited to between 2412MHz and 2458MHz and the power
to a maximum of +22dBm (2412-2426MHz) and +18dBm (2458MHz) for the required antennas for compliance
to FCC standards, U.S. only.
NOTE 2 The center frequencies of the ORION5850 radio is limited by firmware between 5731MHz and
5844MHz as outlined in Sections 2.2.1.4 and 2.2.1.5 and the transmit power is limited to +24dBm. The device
must be used with one of the antennas listed below to comply with FCC standards:
1) Gabriel Electronics parabolic antenna, model number SSP2-52B
2) Harris Corporation flat panel antenna, model number MT-20004.
INDUSTRY CANADA NOTICE
This device has been designed to operate with an antenna having a maximum gain of 33 dBi. Antenna having a higher gain
is strictly prohibited per regulations of Industry Canada. The required antenna impedance is 50 ohms.
Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must
accept any interference, including interference that may cause undesired operation of the device.
Exposure of Humans to RF Fields
The installer of this radio equipment must ensure that the antenna is located or pointed such that it does not emit RF field in
excess of Health Canada limits for the general population; consult Safety Code 6, obtainable from Health Canada's website:
www.hc-sc.gc.ca/rpb

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 4
Publication Number: 862-01881
Issue 10
March 2003
© 2003 Tellumat (Pty) Limited
The information contained herein is the property of Tellumat (Pty) Limited and is supplied
without liability for errors or omissions. No part may be reproduced, used or disclosed
except as authorised by contract or other written permission. The copyright and the
foregoing restriction on reproduction, use and disclosure extend to all media in which this
information may be embodied, including magnetic or electronic storage etc.

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 5
Table of Contents
Page
1INTRODUCTION 10
1.1 Radio Description 10
2TECHNICAL DESCRIPTION 14
2.1 System Overview 14
2.2 Outdoor Unit 14
2.2.1 Frequency plans 15
2.2.2 RF Power Output Options 19
2.2.3 MDR2400, MDR5800 and Orion 5850 Outdoor Units 19
2.3 Indoor Unit 20
2.3.1 Payload Interface Options 21
2.3.2 1+1 Redundancy Protected Payload System 21
2.3.3 Indoor Unit Status LEDs 21
2.3.4 Reset / Configuration Button 22
2.3.5 Service (Wayside) Serial Data Channel 23
2.3.6 Element Manager Port 23
2.3.7 10BaseT Ethernet RJ45 Port 24
2.3.8 IU/OU Link LED 24
2.3.9 IU/OU Data Interconnect RJ45 24
2.3.10 IU/OU Power Interconnect 24
2.3.11 Auxiliary In/Out Port 24
2.3.12 IU DC Power Input 25
2.3.13 Fuse Holder 25
2.3.14 ON/OFF Switch 25
2.3.15 Ground Terminal 25
3PLANNING 26
3.1 System Type Selection 26
3.1.1 Antenna selection 26
3.2 Site Evaluation 27
3.3 Multipath Effects 27
3.4 Interference Considerations 28
3.5 Microcell Backhaul Applications of MDR / Orion Digital Radios 29
3.5.1 Setting the Transmitted Power Levels 29
3.5.2 Frequency Multiplexing 29
3.5.3 Antenna Isolation 29
4INSTALLATION 30

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 6
4.1 Customer Furnished Tools and Equipment 31
4.2 Indoor Unit 32
4.2.1 Introduction 32
4.2.2 Installing the Indoor Unit in a Rack 32
4.2.3 Connecting a DC Power Supply 33
4.2.4 Balanced Payload Data : DB25 34
4.2.5 Balanced Payload Data : RJ48 35
4.2.6 Unbalanced Payload Data : BNC 35
4.2.7 Connecting Auxiliary In/Out (Optional) 35
4.2.8 Connecting the Service (Wayside) Serial Channel (Optional) 36
4.2.9 Connecting the Element Manager Port 36
4.3 Outdoor Unit 38
4.3.1 RF Connection 38
4.4 Interconnection Cable Installation 38
4.4.1 INTERCONNECTION CABLE WIRING DESCRIPTION 40
5ANTENNA ALIGNMENT AND SOFTWARE SETUP 42
5.1 Installation Equipment Required 42
5.2 Information Required 42
5.3 Antenna Alignment 42
5.3.1 Introduction 42
5.3.2 Alignment Procedure 42
5.3.3 Set Transmitted Power Level 44
5.4 Software Setup 45
5.5 Functional Test 45
5.5.1 Link Bit Error Rate Performance Test 45
5.6 MDR / Orion Installation Record 46
5.7 MDR / Orion Test Record 47
6NMS SOFTWARE 48
6.1 Scope 48
6.2 Introduction 48
6.3 System requirements 48
6.4 Installing the NMS 49
6.4.1 JRE Installation 49
6.4.2 NMS Installation 49
6.4.3 NMS Un-Installation 49
6.5 Help documentation 50
7MAINTENANCE INFORMATION 51
8TECHNICAL DATA 52
8.1 Environmental Requirements 52

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 7
8.1.1 Outdoor Equipment 52
8.1.2 Indoor Equipment 52
8.2 Mechanical Information for Outdoor Equipment 52
8.3 Mechanical Information for Indoor Equipment 52
8.4 Power Supply Requirements 52
8.5 Electrical Performance 53
8.5.1 General Characteristics 53
8.5.2 Transceiver Characteristics 55
8.5.3 RF Interface 56
8.5.4 Payload Data Interfaces 56
8.5.5 Ethernet Traffic Interface 56
8.5.6 Auxiliary Input Interface (CONTACT CLOSURE) 57
8.5.7 Auxiliary Output Interface 57
8.5.8 Wayside channel interface 57
8.5.9 Element Manager Port Interface 57
8.5.10 Indoor/Outdoor Unit Interface 57
8.6 Ordering Information 59
1APPENDIX: ELEMENT MANAGER PORT POINT-TO-POINT SERIAL
COMMUNICATIONS SETUP 66
Adding a Modem : Windows NT 66
Adding Dial-up Networking : Windows NT 71
To add dial-up networking 71
Adding a Modem : Windows 95/98 76
Adding Dial-up Networking : Windows 95/98 78
Adding Dial-up Networking : Windows 2000 / Windows XP 80
To add dial-up networking 80
2APPENDIX: MANAGEMENT OF THE MDR2400-SR MDR5800-SR AND THE ORION
5825-SR 87
SNMP and the MDR / Orion 87
The MIB Elements – OID (Object ID) DESCRIPTIONS 89
The MIB elements – TRAP DESCRIPTIONS 104
3APPENDIX: SETUP OF A PC (WIN 95, 98, NT) TO ALLOW PINGING OF A ‘REMOTE’-
CONFIGURED INDOOR UNIT 106
IP CONFIGURATION OF THE MDR / Orion – ROUTING CONFIGURATION 106
IP CONFIGURATION OF THE MDR / Orion – BRIDGING CONFIGURATION 108
4APPENDIX: MDR5800 HARDWARE VERSION 1, 2.X DIFFERENCES, COMPATIBILITY
SUMMARY 109
5APPENDIX: FIXED ANTENNAS 112
MDR5800 112

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 8
ORION5850 112
MDR2400 112
6APPENDIX: USEFUL WEB LINKS 113
7APPENDIX: MDR / ORION SCALABLE 1-TO-4/8 E/T1 / 10 BASE-T ETHERNET
FUNCTIONALITY 114
8APPENDIX: MDR / ORION FTP FIRMWARE UPLOAD 115
9APPENDIX: GETTING STARTED GUIDE 117
Checklist for Bench Testing (without a PC) 117
Interpretation 118
Action 118
One Page Set-up for T1/E1 Bench Test (without a PC) 119
10 APPENDIX: 1+1 PROTECTION SYSTEM OPERATION 121
Introduction 121
System Description 121
Technical Description 122
System Overview 122
System Configuration 122
System functional description 124
Installation 126
Hardware Installation 126
Radio Software Configuration 127
System Verification 129

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 9
List of Abbreviations
BIT Built-in-Test
AIS Alarm Indication Signal
PER Packet (or Block) Error Rate
DC Direct Current
DCE Data Communications Equipment
DRL Digital Radio Link
DRS Digital Radio Station
DTE Data Terminal Equipment
GUI Graphical User Interface
IU Indoor Unit
ISM Industrial, Scientific and Medical
LED Light Emitting Diode
LOS Loss of signal
Mbps Megabits per second
N.C Normally-closed
N.O Normally-open
NMS Network Management System
OU Outdoor Unit
PC Personal Computer
RF Radio Frequency
RSSI Received Signal Strength Indication
SNMP Simple Network Management Protocol

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 10
1 Introduction
1.1 Radio Description
The MDR2400-SR and MDR5800-SR are ISM band digital radio systems that provide
short to medium range, point-to-point digital communication with high data security at
rates of T1, 2T1 or 4T1. Alternatively, the radio can be software configured to convey
E1, 2E1 or 4E1. The radio can also be configured to bridge or route IP via a 10BaseT
port. The data rates scale depending on the number of enabled T1/E1 tributaries and
whether the data is being bridged or routed. The products make use of spread
spectrum technology and may be operated license-free in the 2.4GHz and 5.8GHz
ISM bands.
The Orion 5825-SR is a similar radio also operating in the 5.8GHz ISM band.
Modulation can be switched between 16 and 32 QAM with digital output scalable up to
8T1/E1.
The radios are ideal for applications such as:
•Cellular/PCS base station interconnects.
•Telecommunications companies, cellular operators and private
carriers.
•State Local and Federal Government communication systems.
•Video surveillance data distribution.
•Power utilities.
•Petroleum/gas collection companies.
•Rural communications.
•Emergency/disaster telephone service restoration.
•Internet distribution.
The radio consists of two main parts:
a. An Outdoor Unit operating in the 2.4 GHz or 5.8 GHz ISM frequency bands.
This could be an MDR2400ET, an MDR5800 or an Orion 5850
unit.
b. An Indoor Unit, available with a Telecommunications (1, 2 or 4T1/E1 and up to
8T1/E1 on the Orion 5825) interface and a Data interface (10BaseT Ethernet).
This could be an MDRTE, an MDRETU (75 Ohm BNC) or an Orion
25 unit. The MDRTE and MDRTEU units operate with the
MDR2400ET and the MDR5800 Outdoor Unit.
Interconnection between the Outdoor Unit and Indoor Unit is achieved using a low-
cost UV-protected STP (Screened Twisted Pair: 4 pairs) data cable and a UV-
protected 2-core power cable. The split Indoor Unit and Outdoor Unit configuration is
used for the lowest loss between the antenna and the transceiver, thereby ensuring
optimal long-range performance.
The Outdoor Units use a Type-N RF (female) output connector for
connection to a coaxial cable jumper when co-located with a 2.4 GHz or
a 5.8 GHz antenna for applications where long range is required.
The Outdoor Unit can also be located remote from the antenna (tower
base or indoor mounted). The RF connector is then connected to the

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 11
antenna via a coaxial transmission line. An optional indoor rack
mounting adapter is available for mounting the OU, indoors.
The system is available for use in FCC regulated countries.

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 12
Model variants
Table 1. MDR2400 model variants
Model
Number
Interfaces Antenna
Coupling
MDR2400-ET1 T1/E1
10BaseT
Ethernet
N-type Female
MDR2400-ET2 2 x T1 / 2 x E1
10BaseT
Ethernet
N-type Female
MDR2400-ET4 4 x T1 / 4 x E1
10BaseT
Ethernet
N-type Female
Table 2. MDR5800-SR model variants
Model
Number
Interfaces Antenna
Coupling
MDR5800-ET1 T1/E1
10BaseT
Ethernet
N-type Female
MDR5800-ET2 2 x T1 / 2 x E1
10BaseT
Ethernet
N-type Female
MDR5800-ET4 4 x T1 / 4 x T1
10BaseT
Ethernet
N-type Female
Table 3. Orion 5825-SR model variants
Model
Number
Interfaces Antenna
Coupling
Orion 5825-
ET8
currently only:
8 x T1 / 8 x E1
10BaseT
Ethernet
N-type Female
Refer to section 8.6, page 59 for ordering details.
The Network Management System provides control and management of the product.
SNMP support via an SNMP agent in the Indoor Unit ensures open network
management compatibility.
Comprehensive data and RF loop-back functions ensure that the system is easy to
install and maintain.

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 13

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 14
2 Technical Description
2.1 System Overview
A digital radio link (DRL) consists of a pair of MDR / Orion radio stations.
The radio stations consists of two main parts:
•An Outdoor Unit operating in the 2.4GHz or 5.8 GHz ISM frequency bands. The
Outdoor Unit provides the radio transceiver functionality by accepting radio link
data from the Indoor Unit and converting it to the 2.4GHz or 5.8 GHz ISM
frequency band using spread spectrum or QAM modulation. The received signal
is de-modulated and transmitted to the Indoor Unit in a digital format.
•An Indoor Unit, available with 1, 2, 4 or 8 T1 and 1, 2, 4 or 8 E1 data interfaces
(choice of T1 or E1 is software selectable). The Indoor Unit combines nT1 or nE1
data with Wayside Service Channel serial data and link IP data to be transmitted
across the radio link. The Indoor Unit also provides power to the Outdoor Unit.
Interconnection between Outdoor Unit and Indoor Unit is achieved using low cost data
and power cables.
2.2 Outdoor Unit
The MDR2400 and MDR5800 Outdoor Units make use of Spread Spectrum
modulation technology for license-free operation in the 2.4GHz and 5.8 GHz ISM
bands. The Orion5850 Outdoor unit uses three software selectable bandwidths for
license-free operation in the 5.8 GHz ISM band.
For operation, the ISM bands are divided into upper and lower frequency sub-bands.
A ‘High Band’ Outdoor Unit transmits in the higher frequency sub-band and receives in
the lower frequency sub-band, while a ‘Low Band’ Outdoor Unit transmits in the lower
sub-band and receives in the higher sub-band. An MDR / Orion radio link will use a
‘Low Band’ Outdoor Unit on one end of the link to communicate with a ‘High Band’
Outdoor Unit on the other end.
The Outdoor Units use a Type-N RF output connector for connection to suitable
2.4GHz and 5.8GHz antennas for applications where long range is required.
The system is available for use in FCC regulated countries.
User Data
MDR2400, MDR5800 or
Orion 5850 OU
MDR / Ori on IU
User Data
MDR2400, MDR5800 or
Orion 5850 OU
MDR / Ori on IU

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 15
2.2.1 Frequency plans
The MDR5800 and the Orion 5850 Outdoor Units operate in the 5.725 GHz to 5.850
GHz ISM frequency band with predefined frequency channel plans (termed A, B, C and
D). Channel plan D is user selectable / adjustable.
The MDR2400 Outdoor Units operate in the 2.400 GHz to 2.4835 GHz ISM frequency
band with predefined frequency channel plans (termed A, B and D). Channel plan D is
user selectable / adjustable.
2.2.1.1 MDR5800 Frequency Channel Plan A, B and C
The channel spacing is based on the bandwidth occupied by the spread spectrum
signal (approximately 17 MHz) and is used to optimise link performance. In the case
of plan A, plan B and C, note that both Outdoor Units of a link must be set up to the
same frequency channel plan (i.e. A, B or C).
C
H
B
H
Frequency (MHz)
LOW BAND TRANSMIT HIGH BAND TRANSMIT
A
H
A
L
B
L
C
L
5735 5753 5771 5804 5822 5840
Figure 1. MDR5800 Frequency channel plans A, B and C

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 16
2.2.1.2 MDR2400 Frequency Channel Plan A, B (non-FCC)
The channel spacing is based on the bandwidth occupied by the spread spectrum
signal (approximately 17 MHz) and is used to optimise link performance. In the case
of plan A and B, note that both Outdoor Units of a link must be set up to the same
frequency channel plan (i.e. A or B).
A
H
B
H
Frequency (MHz)
LOW BAND
TRANSMIT
HIGH BAND
TRANSMIT
A
L
B
L
2410 2426 2458 2474
Figure 2. MDR2400 Frequency channel plans A and B
2.2.1.3 MDR2400 FCC Compliant Frequency Channels for the U.S. only
In countries where FCC compliance is required, only the following
frequencies may be used:
Low band outdoor unit – 2412MHz to 2426MHz,
High band outdoor unit – 2458MHz.
Use frequency plan D (variable frequency) to set the outdoor unit.
DH
Frequency (MHz)
LOW BAND TRANSMIT HIGH BAND
TRANSMIT
DLDL
2412 2426 2458
Figure 3. MDR2400 FCC Compliant Frequency Channels for the U.S. only
2.2.1.4 Orion 5850 Frequency Channels Plan A, B and C (FCC Compliant)

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 17
The channel spacing is based on the transmit bandwidth, either 3 MHz, 6 MHz, or 10
MHz, software selectable. Different bandwidths can be selected dependent on the
optimum link performance; required system sensitivity versus data transfer rate.
Only channel frequencies that are FCC compliant can be selected through the
configuration software. The channel frequency ranges are programmed into the radio
firmware and cannot be adjusted by the user.
The radios were tested and approved for FCC compliance with the frequency ranges
below, see Figure 4.
Low band Outdoor Unit:
Modulation Type Lowest Center Freq.
(MHz)
Highest Center Freq.
(MHz)
8464kbps / 16-QAM 5731 5774
16928 kbps / 16-QAM 5732 5773
25392 kbps / 16-QAM 5734 5771
High band Outdoor Unit:
Modulation Type Lowest Center Freq.
(MHz)
Highest Center Freq.
(MHz)
8464kbps / 16-QAM 5801 5844
16928 kbps / 16-QAM 5802 5843
25392 kbps / 16-QAM 5804 5841
NOTE 1 Both Outdoor Units in a link must be set to the same frequency channel plan
(i.e. A, B, C or D) and modulator type. Also note that the frequencies differ for different
transmit bandwidths, i.e. the frequency of channel A changes according to the transmit
bandwidth.
NOTE 2 Figure 4 reflects all the frequency bands that could be obtained with the
ORION5850 OU. Pre-programmed frequency ranges in the radio firmware prevent the
user from selecting transmission options that will not meet FCC requirements.
Frequency [MHz]
5731 57745801 5844
ABCABC
Low Transmit Band High Transmit Band
Figure 4. Orion 5850 Frequency channel plans A, B and C. Refer to NOTE 2 above with
regards to FCC standards compliance of the different band plans.

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 18
2.2.1.5 Frequency Channel Plan D (FCC Compliant)
Frequency plan D allows independent control of transmit and receive frequencies.
This allows a flexible frequency plan and can be used to overcome interference in the
2.4GHz and 5.8 GHz ISM bands.
The frequencies that can be used in the lower or upper sub-bands can be selected in
1 MHz increments. Performance degradation can be expected when operating using
channel plan D mode with the chosen frequencies close to the sub-band edges i.e. a
choice of one of the high frequencies in the lower sub-band and one of the lower
frequencies in the upper sub-band.
The allocation of Channel plan D frequencies is shown in Table 4, Table 5 and Table
6.The Orion 5825 has up to three different sets of minimum and maximum
frequencies, which are determined by the data rate setting of the OU.
Only channel frequencies that are FCC compliant can be selected through the
configuration software. The channel frequency ranges are programmed into the radio
firmware and cannot be adjusted by the user.
The radios ware tested and approved for FCC compliance with the frequency ranges
below, see Figure 4.
Table 4. MDR2400 Channel plan D channel frequencies
Sub-band Center Frequency (MHz)
L 2410-2426
H 2458-2474
NOTE the allowable operation range in FCC countries, page 16.
Table 5. MDR5800 Channel plan D channel frequencies
Sub-band Center Frequency (MHz)
L 5735-5771
H 5804-5840
Table 6. Orion 5850 Channel plan D channel frequencies
Center Frequency (MHz)
RF BW [MHz] /
Data Rate
[kbps] Lower Sub-band Upper / Higher Sub-band
2.6 / 8464 5731-5774 5801-5844
5.4 / 16928 5732-5773 5802-5843
8.0 / 25392 5734-5771 5804-5841
2.2.1.6 Orion 5850 Modulator Types
The Orion 5850 can operate with different modulator types, the trade-offs being better
radio performance versus higher data throughput. The changes can be made via
software, using either the Orion NMS / GUI or an SNMP client application.
Modulator types and frequency bands that were tested and approved for compliance
with FCC regulations are specified in Sections 2.2.1.4 and 2.2.1.5.

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 19
Table 7. Orion 5850 Modulator Types
Data Rate
[kbps]
Modulation
type
Raw data
throughpu
t [bit/sec]
Typical
Payload
Approx. OU
output spectrum
BW
8464 16-QAM 8 464 052 4T1/E1 +
150kbit
Ethernet
2.6 MHz
16928 16-QAM 16 928 105 8T1/E1 +
150kbit
Ethernet
5.4 MHz
25392 16-QAM 25 392 157 8T1/E1 +
9.5Mbit
Ethernet
8 MHz
NOTE 1: Changing the modulator type of an Orion 5850 Outdoor Unit may take up to
30 seconds. During this period, the link will not be available. Changing the OU
modulator type does not support Auto Recovery thus; the modulator type of the remote
station must be changed before the modulator type of the local station is changed.
2.2.2 RF Power Output Options
The Outdoor Unit is designed for use in countries that have adopted FCC standards.
It is possible to adjust the output power on the OU using the supplied NMS software or
a SNMP Management application. The FCC standards for the MDR2400 unit require
a limited output power as stated on page 2, U.S. only.
NOTE 1 The firmware on the Orion and MDR type OUs will not accept power level
settings that fall outside the FCC compliant levels.
2.2.3 MDR2400, MDR5800 and Orion 5850 Outdoor Units
The Outdoor Units transmit and receive RF signals through a diplexer interfaced via
an RF cable to an external antenna. The unit has a type-N connector for connection
to the RF cable used between the OU and the antenna.
The Outdoor Unit houses the following main parts:
c. Transmit/Receive Modules
d. Baseband Modulator/Demodulator Circuitry
e. Microcontroller/Framing & Buffering Circuitry
f. Power Amplifier
g. Diplexer

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 20
2.3 Indoor Unit
The Indoor Unit is designed for mounting in a 19” rack, occupying a 1U slot. It can
also be used as a table-top system.
The Indoor Unit accepts n x T1/nE1 user payload channels and combines it with
Wayside Service Serial Data and IP data to be transmitted across the radio link.
The Indoor Unit is fitted with a DC power supply.
There are three types of Indoor Units:
An MDR 120 Ohm (scalable up to 4 T1/E1),
an MDR 75 / 120 Ohm (scalable up to 4 T1/E1),
and an Orion 25 Indoor Unit (scalable up to 8 T1/E1).
A firmware variant exists that determines whether the Outdoor Unit used with the MDR
Indoor Unit is an MDR2400 or an MDR5800. The Indoor Unit hardware is
independent of the type of Outdoor Unit i.e. whether it is an MDR2400 or MDR5800.
The Orion 25 Indoor Unit is used with the Orion 5850 Outdoor Unit, but can also
support the MDR2400 and MDR5800 OUs if the appropriate firmware version is
loaded on the Indoor Unit.
MDR MTE INDOOR UNIT V2, 120 OHM 651-03810-02.1, front panel
MDR MTE 75/120 OHM INDOOR UNIT 651-04008-02, front panel
MDR MTE 120 OHM and 75/120 OHM INDOOR UNIT, rear panel
Orion 25 INDOOR UNIT 651-04189-01 (front panel – no rear panel connectors)
1 Payload
T1/E1
1 Payload
T1/E1
2 IU Status
LEDs
2 IU Status
LEDs
2 IU Status
LEDs
3 Reset
button
3 Rese
t
button
3 Reset
button
9 OU
DC Out
9 OU DC
Out
4
4
4
5
5
5
6 10BaseT
RJ45 Socket
6 10BaseT
RJ45 Socke
t
6 10BaseT
RJ45 Socket
7
7
8 IU/OU
Data RJ45
8 IU/OU
Data RJ45
10 Auxiliary IO
10 Auxiliary IO
11 IU
DC In
11 IU DC In
12
Fuse
12
Fuse
13 ON/OFF
Switch
14 Ground
Terminal
14 Ground
Terminal
1 Payload
T1/E1