MDS LEDR 400S, LEDR 700S, LEDR 400F, LEDR 900F, LEDR 1400S Operation Manual
...
Microwave Data Systems Inc.
LEDR Series
Digital Microwave Radios
Covering LEDR 400S/F, 700S, 900S/F, 1400S/F Models
Including Protected (1+1) and Space Diversity Versions
P/N 05-3627A01, Rev. D
JANUARY 2003
Installation & Operation Guide
)
QUICK-START GUIDE
LEDR Series radios are supplied from the factory in matched pairs and are configured to user’s specifications. There are a few steps necessary to place the pair on-the-air communicating with each other.
Once this is done, system-specific parameters will need to be reviewed and changed to match your
requirements. Below are the basic steps for installing the LEDR radio. For more detailed instructions,
please see “INITIAL STARTUP AND CONFIGURATION” on page 25. When making cable connections,
refer to Section 3.6,
1. Install and connect the antenna system to the radio
• Ensure a path study has been conducted and that the radio path is acceptable.
• Use good quality, low loss coaxial cable. Keep the cable as short as possible.
• Preset directional antennas in the direction of desired transmission/reception.
2. Connect the data equipment to the rear panel data interface
Rear Panel Connectors
, on page 17 for a rear panel view of the radio.
• The data interface should be an RJ-45 connector for Fractional-T1, Fractional-E1, or E1, and a
DB-25 connector for EIA-530.
• Verify the customer premises data equipment is configured as DTE. (By default, the LEDR radio is
configured as DCE.)
3. Apply DC power to the radio
• Verify that the line voltage matches the power supply input range (typically 24 Vdc or 48 Vdc).
• The power connector is a three-pin keyed connector. The power source can be connected with
either polarity. The center conductor is
• Ensure the chassis Ground lug is connected to an appropriate ground point.
4. Change SUPER password and set up user access
• Login to Network Management System, using the password
“login” on page 68
(See
• Change the password using the
• Set up required users, passwords and access levels using the
See “user” on page 86.
(
5. Set the radio’s basic configuration using front panel or Console interface
• Set the transmit/receive frequencies (
factory settings. (See
.)
PASSWD
“freq” on page 59
not
connected.
command. (
TX xxx.xxxx
.)
SUPER
.
See “passwd” on page 72.
USER
command, as required.
RX xxx.xxxx
/
) if they need to be changed from the
)
• Refer to this manual for other configuration settings.
6. Verify and set the following parameters as necessary to allow data throughput and interconnection with the network.
• RF transmit and receive frequencies. (See
• Radio modulation type and data rate parameters. (
• Data interface clocking. (
• Data framing. (
See “fstruct” on page 59.
See “clkmode” on page 55.
“freq” on page 59
).
See “modem” on page 71.
).
.)
).
Quick-Start instructions continued on the rear cover of this manual.
TABLE OF CONTENTS
1.0 INTRODUCTION ..................................................................................................................1
1.1 Product Description .......................................................................................................................1
1.2 LEDR Features ..............................................................................................................................2
1.3 Typical Applications .......................................................................................................................3
1.4 Protected Configuration .................................................................................................................3
2.0 MODEL NUMBER CODES...................................................................................................4
3.0 HARDWARE INSTALLATION AND BASIC INTERFACE REQUIREMENTS ........................7
3.1 Introduction ....................................................................................................................................7
3.2 General Requirements ..................................................................................................................7
Site Selection...................................................................................................................................8
Terrain and Signal Strength .............................................................................................................8
On-the-Air Test.................................................................................................................................9
A Word About Interference...............................................................................................................9
3.3 Antenna and Feedline Selection ..................................................................................................10
Antennas........................................................................................................................................10
Feedlines .......................................................................................................................................11
3.4 Radio Mounting ...........................................................................................................................13
Maximizing RSSI............................................................................................................................13
Attaching the Rack Mounting Brackets ..........................................................................................13
3.5 Front Panel ..................................................................................................................................14
Indicators, Text Display and Navigation Keys.................................................................................14
Connectors.....................................................................................................................................16
3.6 Rear Panel Connectors ...............................................................................................................17
Connector Locations......................................................................................................................17
Ground Stud...................................................................................................................................18
Antenna/TX—RF Connector..........................................................................................................18
RX—RF Connector........................................................................................................................18
G.703/Expansion Data...................................................................................................................19
Ethernet .........................................................................................................................................19
EIA-530-A ......................................................................................................................................20
Service Channel ............................................................................................................................20
Alarm I/O........................................................................................................................................21
DC Power Input (Primary Power)...................................................................................................22
Protected Configuration Connections............................................................................................23
3.7 Bandwidths, Data Rates and Modulation Types ..........................................................................23
3.8 Transmit Clock Selection (Subrate Radios Only) .........................................................................24
4.0 INITIAL STARTUP AND CONFIGURATION.......................................................................25
4.1 Introduction ..................................................................................................................................25
MDS 05-3627A01, Rev. D LEDR Series I/O Guide i
4.2 STEP 1—Power up the LEDR Radios .........................................................................................25
4.3 STEP 2—Establish Communications with the Radio ..................................................................26
4.4 STEP 3—Make Initial Login to Radio ..........................................................................................26
4.5 STEP 4—Change the SUPER Password ....................................................................................27
4.6 STEP 5—Review Essential Operating Parameters .....................................................................28
4.7 STEP 6—Set TCP/IP Settings to Enable SNMP and/or Telnet Management (if required) ..........29
4.8 STEP 7—Set User Configurable Fields .......................................................................................29
4.9 STEP 8—Verify Radio Performance ............................................................................................29
4.10 STEP 9—Install the Link ...........................................................................................................29
4.11 STEP 10—Verify the Link Performance ....................................................................................29
5.0 CONFIGURATION AND CONTROL VIA THE FRONT PANEL...........................................29
5.1 Front Panel LCD Menu Descriptions ...........................................................................................32
CONSOLE .....................................................................................................................................32
Default Screen...............................................................................................................................32
Diagnostics ....................................................................................................................................32
Front Panel.....................................................................................................................................33
G.821.............................................................................................................................................33
General..........................................................................................................................................34
IO Configuration.............................................................................................................................35
Line Configuration..........................................................................................................................36
Login..............................................................................................................................................38
Logout............................................................................................................................................38
Modem...........................................................................................................................................38
Network..........................................................................................................................................39
Orderwire.......................................................................................................................................40
Performance...................................................................................................................................40
Redundant .....................................................................................................................................41
Remote Status...............................................................................................................................42
RF Configuration............................................................................................................................42
6.0 CONFIGURATION AND CONTROL VIA THE CONSOLE PORT ......................................43
6.1 Introduction ..................................................................................................................................43
6.2 Initial Connection to the CONSOLE Port .....................................................................................44
6.3 NMS Commands .........................................................................................................................44
Command Entry Hints—Recalling Commands..............................................................................44
6.4 Command Detailed Descriptions .................................................................................................48
Introduction....................................................................................................................................48
6.5 Disabling the Front Panel Alarm LED for Unused E1 Option Ports .............................................88
7.0 STANDARDIZING RADIO CONFIGURATIONS..................................................................90
7.1 Introduction ..................................................................................................................................90
7.2 Setup by TFTP .............................................................................................................................91
Finding IP Addresses.....................................................................................................................91
Downloading Procedure.................................................................................................................91
Uploading Procedure.....................................................................................................................91
7.3 Setup Through the DB-9 CONSOLE Port ...................................................................................92
ii LEDR Series I/O Guide MDS 05-3627A01, Rev. D
8.0 UPGRADING LEDR FIRMWARE.......................................................................................93
8.1 Introduction ..................................................................................................................................93
8.2 OPTION 1: Uploading Firmware via the CONSOLE Port ............................................................94
Setup..............................................................................................................................................94
Download Procedure .....................................................................................................................94
Verification and Reboot..................................................................................................................94
8.3 OPTION 2: Uploading Firmware Locally by Telnet via Ethernet ..................................................95
Setup..............................................................................................................................................96
Download Procedure .....................................................................................................................96
Verification and Reboot..................................................................................................................97
8.4 OPTION 3: Uploading Firmware from a Remote Server via Ethernet .........................................97
Setup..............................................................................................................................................97
Download Procedure .....................................................................................................................98
Verification and Reboot..................................................................................................................99
9.0 USING ORDERWIRE.........................................................................................................99
9.1 Introduction ..................................................................................................................................99
9.2 Setup ...........................................................................................................................................99
9.3 Operation ...................................................................................................................................100
9.4 Related NMS Commands ..........................................................................................................101
10.0 USING THE SERVICE CHANNEL..................................................................................101
10.1 Concept ...................................................................................................................................101
10.2 Setup .......................................................................................................................................101
10.3 Usage ......................................................................................................................................102
10.4 NMS Commands .....................................................................................................................102
11.0 PROTECTED CONFIGURATION...................................................................................103
11.1 Introduction ..............................................................................................................................103
11.2 Protected Operation ................................................................................................................104
Transmitter Failure .......................................................................................................................104
Receiver Failure...........................................................................................................................105
11.3 Configuration Options—Warm or Hot Standby ........................................................................105
11.4 PSC Rear Panel Connectors ...................................................................................................105
RxA..............................................................................................................................................106
RxB..............................................................................................................................................106
Antenna........................................................................................................................................106
TxA...............................................................................................................................................106
TxB...............................................................................................................................................106
Protected (Data)...........................................................................................................................106
E1.................................................................................................................................................106
Ethernet .......................................................................................................................................106
530 (A&B) ....................................................................................................................................106
EIA-530-A ....................................................................................................................................107
Service Channel ..........................................................................................................................107
11.5 Inter-Unit Cabling for Protected Stations .................................................................................107
11.6 Configuration Commands for a Protected System ..................................................................108
MDS 05-3627A01, Rev. D LEDR Series I/O Guide iii
Redundant Specific Parameters..................................................................................................109
Sample Redundant Configuration Session..................................................................................109
Transmit Clock Selection (Subrate Models Only).........................................................................110
12.0 SPACE DIVERSITY OPERATION...................................................................................111
12.1 Introduction ..............................................................................................................................111
12.2 User Interface & Control ..........................................................................................................111
12.3 Transmit Clock Selection .........................................................................................................111
12.4 Inter-Unit Cabling for Space Diversity Stations ........................................................................112
13.0 SPARE PARTS, UNITS AND ACCESSORIES................................................................113
13.1 Spares .....................................................................................................................................113
13.2 Accessories .............................................................................................................................114
14.0 Fractional-T1 INTERFACE CARD 03-3846A01
Fractional-E1 INTERFACE CARD 03-3846A02........................................................................115
14.1 Introduction ..............................................................................................................................115
14.2 Fractional-T1/E1 Performance .................................................................................................115
14.3 Configurable Parameters .........................................................................................................116
Timeslots and Framing.................................................................................................................116
Line Codes...................................................................................................................................116
Diagnostics ..................................................................................................................................117
Clocking.......................................................................................................................................117
14.4 Field Installation of the FT1 Interface Board ............................................................................117
15.0 INCREASE BANDWIDTH BY CHANGING TRANSMITTER AND RECEIVER FILTERS.....
120
15.1 Introduction ..............................................................................................................................120
15.2 Filter Removal and Replacement ............................................................................................120
15.3 Software Commands ...............................................................................................................122
16.0 BENCH TESTING OF RADIOS......................................................................................122
17.0 TECHNICAL REFERENCE.............................................................................................123
17.1 Specifications—
Models: LEDR 400S, 700S, 900S and 1400S ...................................................................................123
17.2 Specifications—
Models: LEDR 400F, 900F, 1400F .....................................................................................................125
17.3 Specifications—
Protected Switch Chassis ..................................................................................................................126
17.4 Optional Equipment (Consult factory for detailed information) ................................................126
17.5 Accessories .............................................................................................................................127
17.6 I/O Connector Pinout Information ............................................................................................127
Orderwire—Front Panel ...............................................................................................................127
CONSOLE Port—Front Panel......................................................................................................127
Ethernet—Rear Panel..................................................................................................................128
iv LEDR Series I/O Guide MDS 05-3627A01, Rev. D
EIA-530-A Data—Rear Panel......................................................................................................128
G.703 Data Connectors (4)—Rear Panel....................................................................................128
Service Channel—Rear Panel.....................................................................................................129
Alarm—Rear Panel......................................................................................................................129
17.7 Watts-dBm-Volts Conversion ...................................................................................................129
18.0 RADIO EVENT CODES..................................................................................................130
19.0 IN CASE OF DIFFICULTY..............................................................................................138
19.1 FACTORY TECHNICAL ASSISTANCE ...................................................................................138
19.2 FACTORY REPAIRS ................................................................................................................139
To Our Customers
We appreciate your patronage. You are our business. We promise to serve and anticipate your needs. We will strive to
give you solutions that are cost effective, innovative, reliable and of the highest quality possible. We promise to build
a relationship that is forthright and ethical, one that builds confidence and trust.
Copyright Notice
This document and all software described herein are protected by copyright. Copyright 2003, Microwave Data Systems Inc. All rights reserved. Trademarks held by other companies used in this publication are acknowledged to be
property of the holder.
RF
Exposure
Antenna Installation Warning
1. All antenna installation and servicing is to be performed by qualified technical personnel only. When servicing
the antenna, or working at distances closer than those listed in the tables below, ensure the transmitter has been
disabled.
Typically, the antenna connected to the transmitter is a directional (high gain) antenna, fixed-mounted on the
2.
side or top of a building, or on a tower. Depending upon the application and the gain of the antenna, the total composite power could exceed 20 to 50 watts EIRP. The antenna location should be such that only qualified technical
personnel can access it, and that under normal operating conditions no other person can touch the antenna or
approach within 4.34 meters of the antenna. This is a worst case scenario derived from maximum permissible exposure evaluation
for General Population/Uncontrolled Exposure using maximum permitted antenna gain (30 dBi) for LEDR Series
MDS 05-3627A01, Rev. D LEDR Series I/O Guide v
Manual Revision and Accuracy
While every reasonable effort has been made to ensure the accuracy of this manual, product improvements may result
in minor differences between the manual and the product shipped to you. If you have additional questions or need an
exact specification for a product, please contact our Customer Services group using the information at the back of this
guide. Microwave Data Systems reserves its right to correct any errors and omissions. Updated information may also
be available on our Web site at www.microwavedata.com .
Distress Beacon Warning
In the U.S.A., the 406 to 406.1 MHz band is reserved for use by distress beacons. Since the LEDR 400 radio is capable
of transmitting in this band, take precautions to prevent the radio from transmitting between 406 to 406.1 MHz.
RF Emissions
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15
of the FCC Rules or ETSI specification ETS 300 385, as appropriate. 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
may to cause harmful interference in which case the user will be required to correct the interference at his own expense.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s
authority to operate the equipment.
vi LEDR Series I/O Guide MDS 05-3627A01, Rev. D
1.0 INTRODUCTION
This manual is intended to help an experienced technician install, configure, and operate one of the digital radios in the MDS LEDR Series:
400S/F, 700S, 900S/F or 1400S/F. The manual begins with an overall
description of product features and is followed by the steps required to
install the radio and place it into normal operation.
After installation, we suggest keeping this guide near the radio for future
reference.
1.1 Product Description
The LEDR radio (Figure 1) is a full-duplex, point-to-point digital radio
operating in one of three radio frequency bands and at several bandwidths as summarized in Table 1.
Table 1. Key LEDR Radio Characteristics
MODEL(S) BANDWIDTH(S) FREQ. RANGE INTERFACE
LEDR 400S 25/50/100/200 kHz 330-512 MHz FE1
LEDR 400F 0.5/1/2 MHz 330-512 MHz E1/G.703
LEDR 700S 25/50/100/200 kHz 746-794 MHz EIA-530
LEDR 900S 25/50/100/200 kHz 800-960 MHz FE1
LEDR 900F 0.5/1/2 MHz 800–960 MHz E1/G.703
LEDR 1400S 25/50/100/200 kHz 1350–1535 MHz FE1
LEDR 1400F 0.5/1/2 MHz 1350–1535 MHz E1/G.703
FT1
EIA-530
FT1
EIA-530
FT1
EIA-530
With the addition of an optional Fractional-T1 Interface card, a
LEDR 700S or 900S Series radio can be connected to industry-standard
G.703 T1 data interface equipment. See Page 115 for a complete
description of the Fractional-T1, Fractional-E1 and Full Rate E1
options.
All LEDR Series radios (with the exception of the 700S) are available
in a protected “1+1” configuration. The protected configuration consists
of two identical LEDR radios and a Protected Switch Chassis (Figure 2).
The protected configuration performs automatic switchover to a secondary radio in the event of a failure in the primary unit. See PRO-
TECTED CONFIGURATION on Page 103 for detailed information on
this mode.
MDS 05-3627A01, Rev. D LEDR Series I/O Guide 1
In addition, the LEDR Series is available in a space-diversity configuration to allow dual receive paths to improve system availability. See
SPACE DIVERSITY OPERATION on Page 111 for detailed informa-
tion.
1.2 LEDR Features
• General— Common to all models
• Network Management via SNMPc version 1
• Protected Operation (1+1) Compatible
• 1.0 Watt Transmit Power
• Space-Efficient Rack Size (1RU)
• Rugged, Reliable Design
• Voice Orderwire (DTMF compliant)
• Service Channel (Data)
• Subrate Models—LEDR 400S/700S/900S/1400S
• 64, 128, 256, 384, 512* and 768* kbps Data Rates
• 12 x 64 kbps Data Rate with the FT1 or FE1 Interface Board
(LEDR radio with optional PCB installed)
* Contact factory for availability of these rates on the
LEDR 700S.
• Fullrate Models—LEDR 400F/900F/1400F
• 1 x E1 to 4 x E1 data rates
Invisible place holder
Figure 1. The LEDR Digital Radio
2 LEDR Series I/O Guide MDS 05-3627A01, Rev. D
1.3 Typical Applications
• Point-to-point transmission applications
• Cost-effective, “thin route” applications
• Long haul telecommunications links
• Cellular backhaul
• Last-mile links
• Trunked radio links
• SCADA systems
1.4 Protected Configuration
A second configuration of the LEDR product is the protected configu-
ration in which two LEDR radios are monitored and controlled by a
third unit, the Protected Switch Chassis shown in Figure 2. This unit
provides a gateway for data and radio frequency paths to the LEDR data
radio transceivers. Unit performance is continuously measured and
should it fall below user-definable standards, the offline LEDR radio
will automatically be placed online and an alarm condition generated
that can be remotely monitored. Additional details for Protected Configurations are given in Section 11.0 on Page 103.
Invisible place holder
Figure 2. LEDR Protected Switch Chassis (PSC)
MDS 05-3627A01, Rev. D LEDR Series I/O Guide 3
MODEL NUMBER CODES
ARE SUBJECT TO
CHANGE.
DO NOT USE FOR
ORDERING PRODUCTS.
2.0 MODEL NUMBER CODES
The complete radio model number is printed on the serial number label
affixed to the chassis. The following series of figures (Figure 3, Figure 4
and Figure 5) show the significance of each character in the LEDR 400,
900 and 1400 model number string, respectively. Contact the factory for
LEDR 700S data, and for information on optional configurations.
Invisible place holder
DUPLEXER
N= None (Optional External) *
1 = 300–400 MHz *
2 = 400–520 MHz *
3 = 300–400 MHz; Protected @
4 = 400–520 MHz; Protected @
5 = 300–400 MHz; Space Diversity #
6 = 400–520 MHz; Space Diversity #
* Only available with Modes N, 2
@Only available with Modes 3, 5
CLASS
S =Subrate
F =Fullrate
LLLLEEEEDDDDRRRR 4444000000
PROTECTED/STANDBY
N= None *
W= Warm @
H= Hot @
* With Modes N, 2
@ With Modes 3–8
MODES
N= None; EIA -530 *
1=Not Used
2 = None; E1/Fractional-E1
3 = 1 + 1 EIA-530 *
4=Not Used
5 = 1 + 1 E1/Fractional-E1
6 = Space Diversity EIA-530 *
7= Not Used
8 = Space Diversity E1/Fract. E1
* Available in subrate radios
00
RECEIVE FREQ.
1 = 330–380 MHz
2 = 380–400 MHz
3 = 400–462 MHz
4 = 462–512 MHz
NOTES
1.TX and RX frequencies are limited to the range of the
2.TX and RX frequency separation is 27 MHz (minimum)
INPUT VOLTAGE
1 = 24 Vdc
2 = 48 Vdc
BANDWIDTH
A = 25 kHz *
B = 50 kHz *
C= 100 kHz *
D= 200 kHz *
E = 500 kHz @
F =1 MHz @ %
G= 2 MHz @ %
% See Note 2
@Only available with Fullrate radios
RX SPLITTER
N= None *
S = Symmetrical 3 dB @
* With Modes N, 2
@ With Modes 3–8
TRANSMIT FREQ.
A = 330–380 MHz
B = 380–400 MHz
C= 400–462 MHz
D= 462–512 MHz
subband indicated in fields 10 and 11.
REGULATORY
CERTIFICATION
N =Not Applicable
F =FCC/IC
Figure 3. LEDR 400 Series Model Number Codes
4 LEDR Series I/O Guide MDS 05-3627A01, Rev. D
Invisible place holder
MODEL NUMBER CODES
ARE SUBJECT TO
CHANGE.
DO NOT USE FOR
ORDERING PRODUCTS.
DUPLEXER
N= None (Optional External) *
1 = 9 MHz *
2 = 3.6 MHz (External) None *
3 = 760 MHz; None *
4 = 9 MHz; (Internal) Redundant @
5 = 3.6 MHz; (External) Redundant @
6 = 76 MHz; (Internal) Redundant @
7 = 9 MHz; (Internal) Space Diversity #
8 = 3.6 Mhz; (Internal) Space Diversity #
9 = 76 MHz; (Internal) Space Diversity #
* Only available with Modes N, 1
@Only available with Modes 3, 4
#Only available with Modes 6, 7
CLASS
S = Subrate
F =Fullrate
LLLLEEEEDDDDRRRR 9999000000
PROTECTED/STANDBY
N= None *
W= Warm @
H= Hot @
* With Modes N, 2
MODES
N= None; EIA-530*
1 = None; Fractional-T1*
2 = None; Fractional-E1%
3 = 1 + 1 EIA=530*
4 = 1 + 1 Fractional-T1*
5 = 1 + 1 Fractional-E1
6 = Space Diversity EIA-530
7 = Space Diversity T1
8 = Space Diversity; Fractional-E1
* = Available in subrate radios
% = Available in fullrate radios
00
INPUT VOLTAGE
1 = 24 Vdc
2 = 48 Vdc
RECEIVE FREQ.
1 = 800–860 MHz
2 = 860–900 MHz
3 = 900–960 MHz
See Note 1
NOTES
1.TX and RX frequencies are limited to the range of the
BANDWIDTH
A = 25 kHz *%
B = 50 kHz *%
C= 100 kHz *%
D= 200 kHz%
E = 500 kHz@
F =1 MHz@
G= 2 MHz@
* = Not available with Modes 1, 4, 7
% = Only available in subrate radios
@ = Only available in fullrate radios
REGULATORY
CERTIFICATION
N =Not Applicable
RX SPLITTER
N= None *
S = Symmetrical 3 dB @
* With Modes N, 1
@With Modes 3–8
TRANSMIT FREQ.
A = 800–860 MHz
B = 860–900 MHz
C= 900–960 MHz
F =FCC/IC
Figure 4. LEDR 900 Series Model Number Codes
MDS 05-3627A01, Rev. D LEDR Series I/O Guide 5
MODEL NUMBER CODES
ARE SUBJECT TO
CHANGE.
DO NOT USE FOR
ORDERING PRODUCTS.
DUPLEXER
N= None (Optional External) &
R= None (Wired for External) Redundant *
1 = Internal &
2 = Internal; Space Diversity %
* Only available with Modes 3, 5
%Only available with Modes 6, 8
&Only available with Modes N, 2
CLASS
S =Subrate
F =Fullrate
LLLLEEEEDDDDRRRR 11114444000000
MODES
N= None; EIA=530 *
1=Not Used
2 = None; E1/ Fractional-E1
3 = 1 + 1 EIA-530 *
4=Not Used
5 = 1 + 1 E1/ Fractional-E1
6 = Space Diversity EIA-530 *
7= Not Used
8 = Space Divers. E1/Frac. E1
* Available in subrate radios
00
Invisible place holder
INPUT VOLTAGE
1 = 24 Vdc
2 = 48 Vdc
BANDWIDTH
A = 25 kHz *
B = 50 kHz *
C= 100 kHz *
D= 200 kHz *
E = 500 kHz @
F =1 MHz @
G= 2 MHz @
@Only available with Fullrate radios
* Only available with Subrate radios
RX SPLITTER
N= None *
S = Symmetrical 3 dB @
* With Modes N, 2
@With Modes 3–8
REGULATORY
CERTIFICATION
N =Not Applicable
E =ETS 300 630,
ETS 300 385,
MPT 1717
PROTECTED/STANDBY
N= None *
W= Warm @
H= Hot @
* With Modes N, 2
@With Modes 3–8
Figure 5. LEDR 1400 Series Model Number Codes
6 LEDR Series I/O Guide MDS 05-3627A01, Rev. D
3.0 HARDWARE INSTALLATION AND BASIC INTERFACE REQUIREMENTS
3.1 Introduction
Installation of the LEDR radio transceiver is not difficult, but it does
require some planning to ensure optimal efficiency and reliability. There
are two major installation objectives; first, obtain good radio communications between LEDR sites, and second, configure the data interface to
complement your data equipment.
This section provides information to assist you in successfully completing the first phase of installation. You will find tips for selecting an
appropriate site, choosing antennas and feedlines, minimizing the
chance of interference, and the basics of equipment installation. This
material should be reviewed before beginning the radio hardware equipment installation.
When the radio installation is successfully complete, you will need to
address the data interface and operational configuration of the LEDR
radio. It is likely that the radio has been configured by the factory to
meet your basic data interface requirements. Please review the factory
documentation accompanying your shipment for the radios current configuration.
What ever your situation, it is recommended you review the material in
the rest of the manual to gain insight to additional configuration options
and user functions.
3.2 General Requirements
There are four main requirements for installing the radio transceiver—a
suitable installation environment, adequate and stable primary power, a
good antenna system, and the correct interface between the transceiver
and the external data equipment. Figure 6 shows a typical station
arrangement.
MDS 05-3627A01, Rev. D LEDR Series I/O Guide 7
Invisible place holder
DATA INTERFACE
TO DC
POWER SOURCE
(24 or 48 Vdc as appropriate)
CHASSIS GROUND
LEDR RADIO
GRID DISH
ANTENNA
LOW LOSS
COAXIAL CABLE
Figure 6. Typical Station Arrangement
Site Selection
For a successful installation, careful thought must be given to selecting
proper sites for the radios and antenna systems. Suitable sites should
offer:
• An antenna location that provides an unobstructed path in the
direction of the associated station
• A source of adequate and stable primary power
• Suitable entrances for antenna, interface or other required
cabling
• Adequate clearance around the radio for ventilation
These requirements can be quickly determined in most cases. A possible
exception is the first item—verifying that an unobstructed transmission
path exists. Microwave radio signals travel primarily by line-of-sight,
and obstructions between the sending and receiving stations will affect
system performance.
If you are not familiar with the effects of terrain and other obstructions
on radio transmission, the following discussion will provide helpful
background.
Terrain and Signal Strength
A line-of-sight path between stations is highly desirable, and provides
the most reliable communications link in all cases. A line-of-sight path
can often be achieved by mounting each station antenna on a tower or
other elevated structure that raises it to a level sufficient to clear surrounding terrain and other obstructions.
8 LEDR Series I/O Guide MDS 05-3627A01, Rev. D
The requirement for a clear transmission path depends upon the distance
to be covered by the system. If the system is to cover only a limited distance, say 5 km (3.1 miles), then some obstructions in the transmission
path may be tolerable. For longer-range systems, any obstruction could
compromise the performance of the system, or block transmission
entirely.
The signal strength at the receiver must exceed the receiver sensitivity
by an amount known as the fade margin to provide reliable operation
under various conditions.
Detailed information on path planning should be reviewed before beginning an installation. Computer software is also available for this purpose
that can greatly simplify the steps involved in planning a path.
Microwave Data Systems offers path analysis (for paths in the USA) as
an engineering service. Contact the factory for additional information.
On-the-Air Test
If you’ve analyzed the proposed transmission path and feel that it is
acceptable, an on-the-air test of the equipment and path should be conducted. This not only verifies the path study results, but allows you to
see firsthand the factors involved at each installation site.
The test can be performed by installing a radio at each end of the proposed link and checking the Received Signal Strength Indication (RSSI)
value reported at the front panel LCD screen of each radio. If adequate
signal strength cannot be obtained, it may be necessary to mount the station antennas higher, use higher gain antennas, or select a different site
for one or both stations.
A Word About Interference
Interference is possible in any radio system. However, since the LEDR
radio is designed for use in a licensed system, interference is less likely
because frequency allocations are normally coordinated with consideration given to geographic location and existing operating frequencies.
The risk of interference can be further reduced through prudent system
design and configuration. Allow adequate separation between frequencies and radio systems.
C/I Curves
A carrier to interference (C/I) curve can help in frequency and space
coordination. The information in this curve can aid greatly in helping
plan geographic locations and frequency usage for radio systems. Contact the factory for additional information on carrier to interference
curves. A white paper (publication no. 05-3638A01) on the subject is
available from MDS at www.microwavedata.com. Search for the term
“LEDR” under the manuals download area to see this, and all other publications pertaining to the LEDR series.
MDS 05-3627A01, Rev. D LEDR Series I/O Guide 9
Keep the following points in mind when setting up your point-to-point
system:
1. Systems installed in lightly populated areas are least likely to
encounter interference; those in urban and suburban environments
are more likely to be affected by other devices operating in the
radio’s frequency band and adjacent services.
2. Directional antennas must be used at each end of a point-to-point
link. They confine the transmission and reception pattern to a comparatively narrow beam, which minimizes interference to and from
stations located outside the pattern. The larger the antenna, the more
focused the transmission and reception pattern and the higher the
gain.
3. If interference is suspected from another system, it may be helpful
to use antenna polarization that is opposite to the interfering system’s antennas. An additional 20 dB (or more) of attenuation to
interference can be achieved by using opposite antenna polarization.
Refer to the antenna manufacturer’s instructions for details on
changing polarization.
3.3 Antenna and Feedline Selection
Antennas
The antenna system is perhaps the most crucial part of the system
design. An antenna system that uses poor quality feedline, or is improperly aligned with the companion site, will result in poor performance, or
no communication at all.
A directional antenna must be used for point-to-point systems to minimize interference both to and from nearby systems. In general, cylindrical or dish type antennas with a parabolic reflector must be used. Yagi
or corner reflector types may be acceptable in some applications. Check
government regulations for your region.
The exact style of antenna used depends on the size and layout of a
system. In most cases, a directional “dish” type of antenna is used with
the radio (Figure 7). Dish antennas maximize transmission efficiency
and restrict the radiation pattern to the desired transmission path.
10 LEDR Series I/O Guide MDS 05-3627A01, Rev. D
Invisible place holder
Figure 7. Typical Grid Dish Antenna
Table 2 lists common grid dish antenna sizes and their approximate
gains. Note: Each antenna is designed to operate within only one frequency band.
Table 2. Dish antenna size vs. approximate gain (dBi)
Antenna Size
Meters (feet)
1.2 Meters
(4 feet)
2.0 Meters
(6 feet)
3.0 Meters
(10 feet)
4.0 Meters
(12 feet)
400 MHz
Gain
13.1 dBi 15.85 dB 18.4 dBi 23.7 dBi
16.3 dBi 19.05 dB 22.0 dBi 26.1 dBi
19.6 dBi 22.35 dB 26.4 dBi 30.6 dBi
22.2 dBi 24.95 dB 28.0 dBi 32.1 dBi
700 MHz
Gain
900 MHz
Gain
1400 MHz
Gain
MDS can furnish antennas for use with your LEDR radio. Consult your
sales representative for details.
Feedlines
For maximum performance, a good quality feedline must be used to
connect the radio transceiver to the antenna. For short-range transmission, or where very short lengths of cable are used (up to 8 Meters/26
Feet), an inexpensive coax cable such as Type RG-213 may be acceptable.
For longer cable runs, or for longer-range communication paths, we recommend using a low-loss cable suited for the frequency band of opera-
™
tion. Helical transmission lines, such as Andrew Heliax
or other
high-quality cable will provide the lowest loss and should be used in
systems where every dB counts. Whichever type of cable is used, it
should be kept as short as possible to minimize signal loss.
Remember that cable loss increases in direct proportion to the transmission frequency used. This means that a system operating at 900 MHz
will experience more cable loss than one operating at 400 MHz.
MDS 05-3627A01, Rev. D LEDR Series I/O Guide 11
The following tables (3, 5, 6 and 6) can be used to select an acceptable
feedline. A table is provided for each of the three bands for which the
LEDR radios are available.
Table 3. Feedline Loss Table (450 MHz)
Cable Type
RG-8A/U 0.5 dB 2.5 dB 5.1 dB 25.4 dB
1/2 in. HELIAX 0.1 dB 0.8 dB 1.5 dB 7.6 dB
7/8 in. HELIAX 0.1 dB 0.4 dB 0.8 dB 4.2 dB
1-1/4 in. HELIAX 0.1 dB 0.3 dB 0.6 dB 3.1 dB
1-5/8 in. HELIAX 0.1 dB 0.3 dB 0.5 dB 2.6 dB
3.05 Meters
(10 Feet)
15.24 Meters
(50 Feet)
30.48 Meters
(100 Feet)
152.4 Meters
(500 Feet)
Table 4. Feedline Loss Table (700 MHz)
Cable Type
RG-8A/U 0.7 dB 3.4 dB 6.8 dB 34.0 dB
1/2 in. HELIAX 0.2 dB 1.0 dB 1.9 dB 9.5 dB
7/8 in. HELIAX 0.1 dB 0.5 dB 1.1 dB 5.3 dB
1-1/4 in. HELIAX 0.1 dB 0.4 dB 0.8 dB 3.9 dB
1-5/8 in. HELIAX 0.1 dB 0.3 dB 0.7 dB 3.3 dB
3.05 Meters
(10 Feet)
15.24 Meters
(50 Feet)
30.48 Meters
(100 Feet)
152.4 Meters
(500 Feet)
Table 5. Feedline Loss Table (960 MHz)
Cable Type
RG-8A/U 0.9 dB 4.3 dB 8.5 dB
1/2 in. HELIAX 0.2 dB 1.2 dB 2.3 dB 11.5 dB
7/8 in. HELIAX 0.1 dB 0.6 dB 1.3 dB 6.4 dB
1-1/4 in. HELIAX 0.1 dB 0.5 dB 1.0 dB 4.8 dB
1-5/8 in. HELIAX 0.1 dB 0.4 dB 0.8 dB 4.0 dB
3.05 Meters
(10 Feet)
15.24 Meters
(50 Feet)
30.48 Meters
(100 Feet)
152.4 Meters
(500 Feet)
unacceptable
loss
Table 6. Feedline Loss Table (1400 MHz)
Cable Type
RG-213 3.0 dB 6.0 dB 12.1 dB 24.1 dB
1/2 in. HELIAX 0.7 dB 1.5 dB 2.9 dB 5.9 dB
7/8 in. HELIAX 0.4 dB 0.8 dB 1.7 dB 3.3 dB
1-5/8 in. HELIAX 0.3 dB 0.3 dB 1.1 dB 2.1 dB
8 Meters
(26 Feet)
15 Meters
(49 Feet)
30 Meters
(98 Feet)
61 Meters
(200 Feet)
12 LEDR Series I/O Guide MDS 05-3627A01, Rev. D
3.4 Radio Mounting
The radio can be mounted either in a 19-inch equipment rack or on a
table top. It should be located in a relatively clean, dust-free environment that allows easy access to the rear panel connectors as well as front
panel controls and indicators. Air must be allowed to pass freely over the
ventilation holes and heat sink on the side panel.
The dimensions of LEDR Series radios are:
• 305 mm (12 in) deep
• 426 mm (16.75 in) wide—Excluding rack mounting brackets
• 45 mm (1.75 in) high—1RU
Maximizing RSSI
For newly installed systems, one of the first tasks is to orient the station
antenna for a maximum Received Signal Strength Indication (RSSI) as
shown on the LCD screen. See “Performance” on Page 40 for details. A
maximum RSSI ensures the antenna is properly aimed at the associated
station. Move the antenna slowly while an assistant observes the RSSI
display for a maximum reading. There may be a time delay between
moving the antenna and updating of the RSSI display. Be sure to allow
adequate time between antenna movements and observations.
Attaching the Rack Mounting Brackets
The radio is normally shipped with the rack mounting brackets uninstalled. To attach them, select the desired mounting position on the sides
of the chassis. (The brackets may be mounted in one of two locations—
flush with the front panel, or near the middle of the chassis.)
NOTE: Both short and long screws are provided with the brackets. Use
the long screws for the heatsink (left) side of the chassis and
the short screws for the right side of the chassis. Tighten the
screws securely.
MDS 05-3627A01, Rev. D LEDR Series I/O Guide 13
3.5 Front Panel
Indicators, Text Display and Navigation Keys
Figure 8 shows the details of the LEDR radio’s front panel indicators,
LCD text display, and menu navigation keys.
STATUS LEDS
LED Indicators
LCD TEXT DISPLAY
SCROLL MODE
INDICATOR SYMBOL
ALARM STATUS LEDS
MENU NAVIGATION KEYS
Figure 8. Front Panel Indicators, Text Display and Keys
The front panel LEDs indicate various operating conditions as outlined
in Table 7.
Table 7. Front Panel LED Functions
LED Indications
POWER
ACTIVE
ALARM
RX ALARM
TX ALARM
I/O ALARM
Primary power is applied to radio
This radio is the on-line/active unit in a
redundant configuration.
A general alarm condition is present
The modem is not locked to a receive
signal
There is a problem with the transmitter
There is a payload data interface error
LCD Display
& Keys
The LCD display provides a two line by 16-character readout of radio
status and parameter settings. It is used with the menu navigation keys
on the right side of the front panel to control the radio’s operation and
access diagnostic information.
Use of the navigation keys (Figure 9) is simple, and allows many basic
operating tasks to be performed without connecting an external terminal
or using additional software.
14 LEDR Series I/O Guide MDS 05-3627A01, Rev. D
Invisible place holder
Figure 9. Menu Navigation Keypad
The keys can be used for two tasks—navigating through menus, and
editing user controllable parameters. The functions of the keys are automatically selected according to the screen that is being viewed by the
user.
Menus The LEDR radio contains 16 primary menus as listed below. These pri-
mary menus serve as entry points to a variety of submenus that can be
used to view or adjust operating parameters and diagnose the radio link.
• Login
• Logout
• Network
• General
• RF Config(uration)
• IO Config(uration)
• Line Config(uration)
• Performance
• G.821
• Diagnostics
• Orderwire
• Front Panel
• Redundant
• Remote Status
See Front Panel LCD Menu Descriptions on Page 32 for detailed
descriptions of all menu items.
Menu Navigation The left and right keys ( ) provide navigation through the available
top level menus (see menu tree, Figure 9) and through series of subordinate menus.
ENTER
The
menus, exposing another menu level. The key always exits the cur-
key allows entry into each primary menu’s subordinate
ESCAPE
rent screen, causing the program to “pop up” one level in the hierarchy.
Parameter Selection
and Data Entry
With an editable menu, such as Login, pressing the key puts the
screen into a data entry mode. Front panel keys are used in one of three
ENTER
ways: 1. character and string creation/selection, 2. scrolling through
lists, and 3. adjusting horizontal slider bars.
1. Character and String Creation/Selection— With some
menus, it is necessary to enter a string of alphanumeric characters. A good example is entering a password at the user
login
menu. In this example, the string is built one character at a time,
and the string is built from left to right on the display.
MDS 05-3627A01, Rev. D LEDR Series I/O Guide 15
The left and right arrow keys move the cursor in the corre-
ENTER
ESCAPE
ENTER
sponding direction. When the cursor is below the character you
wish to change, press
. The arrow keys are then used to step
though the character set, beginning with numbers, then uppercase letters and finally lowercase letters. Each time you press
one of the arrow keys, the display will step to the next character.
If you press and hold the arrow key for several seconds, the characters will scroll by very quickly.
After you have built the string of characters you need, press the
ENTER
key to save the string on the display and return to cursor
navigation mode. To save all changes you have made, place the
cursor under the special carriage return symbol ( ) and press
ENTER ESCAPE
. Pressing will revert the arrow keys to the cursor nav-
igation mode. Pressing in cursor navigation mode cancels
character edit mode without saving any changes.
2. Scrolling Lists/Values— Uses left and right keys ( ) to
scroll through a list of choices or adjust a numeric value, such as
PPPPoooowwwweeeerrrr OOOOuuuutt
tt
. When you are in a menu with a series of fixed parameters, the vertical scroll character ( ) will appear while you are in
the editing/selection mode. If you are asked to select or change
more than one character, you will see a horizontal scroll symbol
( ) in the bottom right-hand corner of the display and a cursor
will appear under the character being edited or changed.
When the desired parameter is in view, move the cursor to the
right as far as it will go, until a carriage return symbol ( )
appears. Pressing the
if your access privileges permit. Pressing cancels the selec-
key will save the selection to its left,
ESCAPE
tion and exits without saving the change.
3. Slider Bar Adjustment—Some menus display a horizontal
bar that changes its length to indicate the level for parameters
that use relative values such as the Orderwire Volume and VOX
threshold. (See Orderwire on Page 40.) Press the key to
increase the value and the to lower the value. Press
ENTER
save the current setting.
Connectors
The front panel of the LEDR radio (Figure 10) has two connectors; both
of them are located on the lefthand side of the panel.
Orderwire The RJ-11 jack with the telephone symbol above it is to connect an
orderwire handset. The orderwire is used by service personnel to communicate through the Service Channel to coordinate system activities
with personnel at another site in the network. The orderwire will not
interrupt the normal data flow through the LEDR data communication
to
16 LEDR Series I/O Guide MDS 05-3627A01, Rev. D
channel, however, it will reduce the throughput efficiency of any data
communications on the Service Channel during periods of voice transmission. See “USING ORDERWIRE” on Page 99 for more information.
CONSOLE The second connector is a DB-9 type with a computer icon over it. Here
is where you can connect a computer’s serial port for unit configuration,
diagnostics and firmware upgrades to the radio.
Invisible place holder
CONSOLE
ORDERWIRE HANDSET
(COMPUTER)
Figure 10. LEDR Front Panel
(All models Identical)
3.6 Rear Panel Connectors
The rear panel of the LEDR radio transceiver contains a number of connectors to interface with the radio’s antenna system, data equipment,
and user remote data network monitoring and control equipment.
Connector Locations
LEDR “S” Series The rear panel of the LEDR “S” Series radios is shown in Figure 11.
Refer to the descriptions that follow for specific information regarding
rear panel connections.
Invisible place holder
• Four RJ-45 connectors with FT1/FE1 Interface PCB installed
• Only one RJ-45 port is active based on selection. See “linename” command.
• DB-68 Connector for interface to Protected Switch Chassis
• If vacant, EIA-530 connector to right is the active data connector.
RX
ANTENNA SYSTEM
CONNECTORS
Note: RX Connector present with external duplexer only.
Antenna/TX
External Duplexer
COOLING FAN
G.703/Expansion Data
1342
ETHERNET
Ethernet
NMS
Data Interface
DATA CONNECTOR
SERVICE CHANNEL
EIA-530-A
Service
Channel
ALARM INPUT & OUTPUT
Alarm I/O DC Power Input
Figure 11. LEDR 400S/700S/900S/1400S Rear Panels
(Shown with Optional FT1/FE1 Interface PCB Installed)
Power Plug
Detail (see text)
DC PRIMARY
POWER
GND
MDS 05-3627A01, Rev. D LEDR Series I/O Guide 17
LEDR “F” Series The rear panel of the LEDR “F” Series radios is shown in Figure 12.
Refer to the descriptions that follow for specific information regarding
rear panel connections.
Invisible place holder
• Four RJ-45 connectors
• DB-68 Connector for G.703 interface to Protected Switch Chassis.
ETHERNET
SERVICE CHANNEL
Power Plug
Detail (see text)
RX
ANTENNA SYSTEM
Note: RX Connector present with external duplexer only.
Antenna/TX
External Duplexer
COOLING FAN
CONNECTORS
Ground Stud
The ground stud on the rear panel provides a point to connect the radio’s
chassis to an Earth ground. This connection is very important for
proper operation of the radio. Do not rely on a ground connection
being made through the rack mounting brackets or other radio
cabling.
Antenna/TX—RF Connector
The
ANTENNA/TX connector is an N-type coaxial connector. When an
internal duplexer is installed, it serves as the connection point for the
station antenna. When an external duplexer is used, it acts as the transmitter RF output (TX) connector to the duplexer.
G.703/Expansion Data
1342
Ethernet
NMS
Data Interface
(Not functional on “F” models)
EIA-530-A
DATA CONNECTOR
Service
Channel
ALARM INPUT & OUTPUT
Alarm I/O DC Power Input
Figure 12. LEDR 400F/900F/1400F Rear Panel
DC PRIMARY
POWER
GND
RX—RF Connector
The
RX (receive) connector is an N-type coaxial connector. It is only
installed if the radio is supplied for use with an external duplexer. It carries receive signals (RX) from the duplexer to the LEDR radio’s
receiver.
When an external duplexer is used, ensure that the higher frequency
(transmit or receive) is connected to the duplexer connector marked
HI
and the lower frequency (transmit or receive) is connected to the
duplexer marked
18 LEDR Series I/O Guide MDS 05-3627A01, Rev. D
LO.
G.703/Expansion Data
The type of connector(s) at this location on the rear panel depends on
several factors: the type of interface required by the customer premises
equipment (CPE) and whether or not the radio is part of a protected
(redundant) configuration. See Table 8 for details.
Table 8. G.703/Expansion Data Connector
Model(s) Configuration Data
LEDR 400S
LEDR 700S
LEDR 900S
LEDR 1400S
LEDR 900S Stand-alone FT1 4 x RJ-45—Only one port is
LEDR 400S
LEDR 900S
LEDR 1400S
LEDR 400F
LEDR 900F
LEDR 1400F
LEDR 400F/S
LEDR 900S
LEDR 1400F/S
NOTES:
1. The capacity of the 4E1 interface can be reduced to one (1E1) or two circuits (2E1).
See linemap command on
2. For RJ-45 pinout information, see
3. This 68-pin interface connector is used only to pass the user data interface, the
Service Channel, and the orderwire circuits to the Protected Switch Chassis for
distribution. Fully-wired DB-68 computer cables (commonly used to interconnect
SCSI computer devices) can be used with this data port connector.
Stand-alone EIA-530 Blank. No connector(s)
Stand-alone FE1 4 x RJ-45—Only one port is
Stand-alone 4E1 4 x RJ-45—All four jacks (A,
Protected All DB-68 (See Note 3)
Page 66, for configuration information.
Interface
Figure 36 on Page 128.
G.703/Expansion
Connector
installed.
active based on linemap
selection.
active based on linemap
selection.
B, C & D) are active.
Notes 1 & 2)
(See Note 2)
(See Note 2)
(See
Ethernet
The ETHERNET connector provides access to the embedded SNMP
agent and other elements of the TCP/IP network-management interface.
The connector is a standard 10Base-T connection with an RJ-45 modular connector. The LEDR Ethernet connections are provided for remote
equipment management (NMS).
Ethernet in
a Repeater
Configuration
At a repeater site with two LEDR radios, the ETHERNET connectors of
each chassis must be connected to each other through a cross-connect
cable or using standard cables to an Ethernet hub. This inter-chassis
Ethernet connection must be made in order for the Orderwire and Service Channel to function properly. (See Figure 13 on Page 21 for further
information.)
MDS 05-3627A01, Rev. D LEDR Series I/O Guide 19
Ethernet in
a Protected
Configuration
The Ethernet connections on the LEDR radio chassis in a protected configuration should not be used. The Ethernet connector of the Protected
Switch Chassis (PSC) provides a connection to the two radio units. Each
radio has a unique IP address and is individually addressable/controllable using SNMP over IP. See “PROTECTED CONFIGURATION”
on Page 103 for general information and Figure 34 on Page 128 for
ETHERNET connector pinout details.
EIA-530-A
The EIA-530-A connector is the main data input/output connector for
the subrate radio. The EIA-530 interface is a high-speed serial data connector. For detailed pin information, see “EIA-530-A Data—Rear
Panel” on Page 128.
NOTE: This connector is not operational on LEDR “F” Series (fullrate)
models.
Service Channel
The Service Channel provides a transparent ASCII “pipe” to which any
RS-232/EIA-232 device can be connected at data rates between 300 and
9600 bps. Whatever ASCII data is entered onto the network through the
Service Channel Port will be sent to the local radio and broadcast to any
other device connected to the Service Channel Port on other associated
LEDR radios in the network.
The Service Channel’s function is identical for all LEDR configurations—stand-alone, repeater, and redundant.
NOTE: Use of the orderwire will slow down data communications on
the Service Channel. It will not effect data traffic on the
primary data interface.
For detailed information on this 9-pin connector, see “Service
Channel—Rear Panel” on Page 129.
20 LEDR Series I/O Guide MDS 05-3627A01, Rev. D
Repeater
Configuration
(Radios with external duplexer)
Data and RF cabling for the repeater station configuration is shown in
Figure 14.
TO DUPLEXER
OF ANTENNA SYSTEM A
TO ANTENNA SYSTEM A
(Radios with internal duplexers)
G.703/Expansion Data
Ethernet
NMS
EIA-530-A
Service
Channel
RADIO A
Alarm I/O DC Power Input
RX
RX
OF ANTENNA SYSTEM B
(Radios with external duplexer)
Protected
Configuration
External
External
TO DUPLEXER
TX
CROSSOVER CABLES
TX
UP TO 4 x G.703
(Fullrate only)
G.703/Expansion Data
TO ANTENNA SYSTEM B
(Radios with internal duplexers)
Data Interface
Ethernet
NMS
Data Interface
ETHERNET CROSSOVER CABLE
SEPARATE CONNECTIONS TO HUB
EIA-530-A
OR
(As Required)
EIA-530 NULL-MODEM
CROSSOVER CABLE
(Subrate Only)
P/N 97-2841L06 (6´/1.8 m)
Service
Channel
Alarm I/O DC Power Input
Figure 13. Inter-unit Cabling—Repeater Configuration
The Service Channel connections on the LEDR radio chassis in a protected configuration should not be used. The
SERVICE CHANNEL con-
nector of the Protected Switch Chassis (PSC) provides a connection to
the two radio units. For further information on protected configurations
please see “PROTECTED CONFIGURATION” on Page 103.
RADIO B
Alarm I/O
This is a 9-pin connector that has both inputs and outputs.
Output Contacts The ALARMS Port is outfitted with four optically-isolated relays that are
controlled by the LEDR radio’s CPU. The contacts (Pins 6, 7, 8, & 9)
are normally open and can handle a non-inductive load of ±60 Volts
Peak (AC/DC) at a maximum current of 1 Ampere. These are suitable
for the control of an external device or indicator when a radio event
occurs.
An alarm output could be used, for example, to sound a claxon when the
radio link goes down, or when the battery for the real-time clock is low.
Another example is to use the alarm outputs to drive the inputs of an
external monitoring system. (See the list of radio events for more
options.) These outputs are not suitable for data interface without the use
of an external “debouncing” circuit.
MDS 05-3627A01, Rev. D LEDR Series I/O Guide 21
Input Connections In addition, four external alarm input lines (Pins 1, 2, 3 & 4) are pro-
vided. Normally, the input is either left open or shorted to ground, to
indicate an alarm condition.
Each alarm input is diode-clamped to +3.3 Vdc or chassis ground, and
can tolerate inputs from -4 to +6 Vdc without drawing excessive current.
If left open, each input is pulled up. To indicate an alarm condition, short
the input pin to the ground provided on the alarm connector (Pin 5). The
maximum DC loop resistance is 2 KΩ. These alarm input lines can tolerate circuit “bounce” common with mechanical relays.
NOTE: The normal (unalarmed) state of the contacts (open or closed)
or input alarm state (high or low) can be selected by a software
subcommand. See “alarm” on Page 50 for details.
Alarm Events The events that cause alarm output signals can be configured in the radio
software. See “evmap” on Page 58 for information on programming
which events trigger an alarm.
See Figure 38 on Page 129 for Alarm I/O pinout information.
DC Power Input (Primary Power)
CAUTION
CAUTION
PPPPOOOOSSSSSSSSIIIIBBBBLLLLEE
EEEEQQQQUUUUIIIIPPPPMMMMEEEENNNNTT
DDDDAAAAMMMMAAAAGGGGEE
EE
POSSIBLE
TT
EQUIPMENT
EE
DAMAGE
The
DC POW ER INPUT connector is a three-pin keyed connector used to
connect an external DC power source. A label next to the power connector indicates the nominal voltage of the radio. Table 9 lists the actual
operating voltage ranges.
The connector matches with a power plug (MDS Part No. 73-1194A22)
which contains binding posts for attaching the positive and negative
power leads. The polarity of the power connections does not matter; the
positive and negative leads may be connected to either the left or right
binding posts as shown in Figure 11 and Figure 12. The center conductor is not connected in the LEDR chassis and should be left unwired.
Table 9. Primary Power Input Options
Nominal Voltage Operating Range
24 Vdc 19.2 to 28.8 Vdc
48 Vdc 38.4 to 57.6 Vdc
Before connecting primary power to the radio, verify that the source
provides a voltage within the proper operating range. Improper voltages
may damage the equipment. Permissible voltage limits are shown in
Table 9.
22 LEDR Series I/O Guide MDS 05-3627A01, Rev. D
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