GE MDS TD220MAX User manual

MDS™ TD220MAX
Robust Communications for Positive Train Control
MDS 05-6906A01, Rev. R
DECEMBER 2018
Technical Manual

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MDS 05-6906A01, Rev. R TD220MAX Technical Manual i
TABLE OF CONTENTS
1.0 INTRODUCTION .................................................................................................................................... 1
1.1 Key Product Features............................................................................................................................. 1
1.1.1 Authorization Features ......................................................................................................... 1
1.2 Accessories and Spares......................................................................................................................... 2
1.3 40-Watt Power Amplifier......................................................................................................................... 2
2.0 PRODUCT DESCRIPTION .................................................................................................................... 3
2.1 Front Panel Connectors and Indicators.................................................................................................. 3
3.0 INSTALLATION PLANNING.................................................................................................................. 4
3.1 Chassis Dimensions ............................................................................................................................... 4
3.2 Mounting Bracket Options ...................................................................................................................... 4
3.2.1 Optional DIN Rail Mounting.................................................................................................. 5
3.3 Antennas and Feedlines......................................................................................................................... 5
3.3.1 Antennas............................................................................................................................... 5
3.3.2 Feedlines.............................................................................................................................. 5
3.4 Power...................................................................................................................................................... 6
3.5 Grounding Considerations...................................................................................................................... 7
3.6 Data Interface (DB-25)............................................................................................................................ 7
3.6.1 Adapter Board ...................................................................................................................... 8
3.7 USB......................................................................................................................................................... 9
3.8 Antenna Connector................................................................................................................................. 10
4.0 STEP-BY-STEP INSTALLATION.......................................................................................................... 11
4.1 Logging On ............................................................................................................................................. 11
4.1.1 Serial Console ...................................................................................................................... 11
4.1.2 Telnet Console ..................................................................................................................... 12
4.2 Initial Startup & Checkout....................................................................................................................... 12
4.3 Upgrade the Firmware............................................................................................................................ 12
4.3.1 Introduction........................................................................................................................... 12
4.3.2 Installing TD220MAX Firmware by TFTP............................................................................. 13
4.3.3 Reprogramming Procedure.................................................................................................. 13
4.4 Set Up a GPS Base Unit......................................................................................................................... 13
4.5 Set Up a PTP Base Unit......................................................................................................................... 14
4.6 Set Up an OTA Mobile Unit .................................................................................................................... 15
4.7 Key the Transmitter ................................................................................................................................ 15
4.8 Perform Test Polling ............................................................................................................................... 15
5.0 MENU INTERFACE................................................................................................................................ 16
5.1 Main Menu.............................................................................................................................................. 17
5.2 Network Configuration Menu.................................................................................................................. 18
5.2.1 IP Configuration Menu.......................................................................................................... 18
5.2.2 SNMP Agent Configuration Menu ........................................................................................ 19
5.3 System Configuration Menu ................................................................................................................... 20
5.3.1 STFP Configuration Menu.................................................................................................... 21
5.4 Radio Configuration Menu...................................................................................................................... 22
5.5 GPS Configuration Menu........................................................................................................................ 23

ii TD220MAX Technical Manual MDS 05-6906A01, Rev R
5.6 PTP Configuration Menu ........................................................................................................................ 23
5.7 Security Configuration Menu .................................................................................................................. 25
5.7.1 User Passwords Menu ......................................................................................................... 26
Console/Telnet Lockout Security..................................................................................................26
5.8 Statistics/Logging Menu.......................................................................................................................... 27
5.8.1 STFP Logger Menu.............................................................................................................. 28
5.8.2 Wireless Packet Statistics Menu .......................................................................................... 29
5.8.3 Dropped Packet Statistics Menu .......................................................................................... 30
5.8.4 Ethernet Packet Statistics Menu .......................................................................................... 31
5.8.5 Event Log Menu ................................................................................................................... 32
5.8.6 View Event Log Menu........................................................................................................... 33
5.8.7 Transfer Options Submenu .................................................................................................. 33
5.8.8 GPS Status Menu (Base Radios Only) ................................................................................ 34
5.8.9 Clock Source Status Menu (Base Radios Only) .................................................................. 34
5.9 Device Information Menu........................................................................................................................ 35
5.9.1 Device Names Submenu...................................................................................................... 36
5.10 Maintenance/Tools Menu ....................................................................................................................... 37
5.10.1 Reprogramming Menu.......................................................................................................... 38
5.10.2 Configuration Scripts Menu.................................................................................................. 39
5.10.3 Ping Utility Menu................................................................................................................... 40
5.10.4 Authorization Codes Menu................................................................................................... 40
5.10.5 Radio Test Menu.................................................................................................................. 41
5.11 Communications Manager Menu............................................................................................................ 42
5.11.1 CM Version Menu................................................................................................................. 43
5.11.2 CM Provisioning Menu ......................................................................................................... 43
5.11.3 CM Configuration Menu........................................................................................................ 44
5.11.4 CM Process Status Menu..................................................................................................... 44
5.11.5 CM Log Menu....................................................................................................................... 45
6.0 TROUBLESHOOTING ........................................................................................................................... 46
6.1 Alarm/Event Conditions .......................................................................................................................... 46
6.1.1 Alarms................................................................................................................................... 46
6.1.2 Correcting Alarm Conditions................................................................................................. 46
6.1.3 Logged Events...................................................................................................................... 48
6.2 Technical Specifications ......................................................................................................................... 50
7.0 ACKNOWLEDGEMENTS ...................................................................................................................... 51

MDS 05-6906A01, Rev. R TD220MAX Technical Manual iii
Copyright and Trademark
This manual and all software described herein is protected by Copyright: 2018 GE MDS, LLC. All
rights reserved. GE MDS, LLC reserves its right to correct any errors and omissions in this
publication.
RF Safety Notice (English and French)
Concentrated energy from a directional antenna may pose a health hazard
to humans. Do not allow people to come closer to the antenna than the
distances listed in the table below when the transmitter is operating. More
information on RF exposure can be found online at the following website:
www.fcc.gov/oet/info/documents/bulletins.
Concentré d'énergie à partir d'une antenne directionnelle peut poser un
risque pour la santé humaine. Ne pas permettre aux gens de se rapprocher
de l'antenne que les distances indiquées dans le tableau ci-dessous
lorsque l'émetteur est en marche. Plus d'informations sur l'exposition aux
RF peut être trouvé en ligne à l'adresse suivante:
www.fcc.gov/oet/info/documents/bulletins.
Antenna Gain vs. Minimum Safety Distance
(Based upon a 50% Duty Cycle, 0 dB Feedline Loss) Uncontrolled Environment Exposure limits
Fixed/Mobile Antenna Gain
0-6 dBi
6-10 dBi
10-16.5 dBi
Safety Distance
1.78 meters
2.82 meters
5.01 meters
FCC Part 15 Notice
Operation is subject to the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received, including interference that
may cause undesired operation. Any unauthorized modification or changes to this device without
the express approval of the manufacturer may void the user’s authority to operate this device.
Furthermore, this device is intended to be used only when installed in accordance with the
instructions outlined in this manual. Failure to comply with these instructions may void the user’s
authority to operate this device.
Servicing Precautions
When servicing energized equipment, be sure to wear appropriate Personal Protective
Equipment (PPE). During internal service, situations could arise where objects accidentally
contact or short circuit components and the appropriate PPE would alleviate or decrease the
severity of potential injury. When servicing radios, all workplace regulations and other applicable
standards for live electrical work should be followed to ensure personal safety.
Manual Revision and Accuracy
This manual was prepared to cover a specific version of firmware code. Accordingly, some
screens and features may differ from the actual unit you are working with. While every reasonable
effort has been made to ensure the accuracy of this publication, product improvements may also
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 GE MDS using
the information at the back of this guide. In addition, manual updates can be found on our web
site at www.gemds.com

iv TD220MAX Technical Manual MDS 05-6906A01, Rev R
Environmental Information
The manufacture of this equipment has required the extraction and use of natural resources.
Improper disposal may contaminate the environment and present a health risk due to hazardous
substances contained within. To avoid dissemination of these substances into our environment,
and to limit the demand on natural resources, we encourage you to use the appropriate recycling
systems for disposal. These systems will reuse or recycle most of the materials found in this
equipment in a sound way. Please contact GE MDS or your supplier for more information on the
proper disposal of this equipment.
ESD Notice
To prevent malfunction or damage to this product, which may be caused by Electrostatic
Discharge (ESD), the radio should be properly grounded at the time of installation. In addition, the
installer or maintainer should follow proper ESD precautions, such as touching a bare metal
object to dissipate body charge, prior to touching components or connecting/disconnecting
cables.
Antenna Installation Warnings
1. A suitable lightning arrestor should be used when indicated by applicable standards or
codes.
2. All antenna installation and servicing are to be performed by qualified technical personnel
only. When servicing the antenna, or working at distances closer than those listed below,
ensure the transmitter has been disabled.
3. Depending upon the application and the gain of the antenna, the total composite power
could exceed 90 watts EIRP. For fixed/mobile configuration, the distances in the table
below must be followed.
FCC Compliance Notice
This device is offered as a licensed transmitter per FCC Parts 80, 90 and 95. It is approved for
use under the following conditions: Changes or modifications not expressly approved by GE
MDS, LLC will void the user’s authority to operate the equipment.
The TD220MAX is approved in the following FCC rule parts:
•FCC part 80, approved for operation from 216-220MHz, 28 watts
•FCC part 90, approved for operation from 217-220MHz, 1.66 watts
•FCC part 90, approved for operation from 220-222MHz, 27.5 watts
•FCC part 95F, approved for operation from 218-219MHz, 20 watts
Please refer to your FCC spectrum license to ensure you are in compliance with the appropriate
radiated power levels.
For FCC Part 95, the Effective Radiated Power (ERP) must be less than or equal to 4 Watts for
mobile use and 20 Watts for fixed use. This can be accomplished by adjusting the output power
of the radio and selecting an antenna with appropriate gain. Consult the following table for
assistance in setting the output power and selecting an antenna to maintain compliance. The
table provides examples, however other combinations can be used.
Effective Radiated Power vs Radio Power
Radio Power Setting
ERP
Maximum Antenna Gain
2 W
4 W
3 dBd (5.2 dBi)
4 W
4 W
0 dBd (2.2 dBi)
2 W
20 W
10 dBd (12.2 dBi)
10 W
20 W
3 dBd (5.2 dBi)
20 W
20 W
0 dBd (2.2 dBi)

MDS 05-6906A01, Rev. R TD220MAX Technical Manual 1
1.0 INTRODUCTION
This manual is for users of the MDS TD220MAX Transceiver shown in Figure 1. It contains an overview
of installation planning data, specifications, troubleshooting, and instructions for using the radio’s menu
system. This manual is intended for technical personnel who perform network design, configuration, and
troubleshooting of the equipment.
All product documentation can be downloaded free of charge from the GE MDS website at
www.gemds.com. The website also contains links to Application Bulletins and other product information.
Figure 1. TD220MAX Transceiver
1.1 Key Product Features
•25 Watt transmit power for long-haul coverage
•Cost-effective solution with no software license or maintenance fees
•Optimized TDMA MAC supports single-frequency operation reducing spectrum license
requirements
•Provides patented Forward Error Correction scheme for robustness in high-speed rail
applications
•Internal or external Communications Manager available
•Provides Ethernet interface for use with local or remote controllers and devices
•Meets environmental specs for rail applications
•Ethernet and Serial Ports via a single rugged DB-25 connector
•Supports SNMP
•Command Console via Serial or Telnet
1.1.1 Authorization Features
Some features of the radio are dependent on purchased options and applicable regulatory constraints. A
“key” icon is shown near the heading of any such features. In some cases, a feature upgrade may
be available. Contact your sales representative for additional information.

2 TD220MAX Technical Manual MDS 05-6906A01, Rev R
1.2 Accessories and Spares
Table 1 lists common accessories and spare items for the transceiver.
Table 1. Accessories & Spare Items
Accessory
Description
Part Number
DIN Rail Mounting Bracket Kit
Contains bracket for mounting the transceiver
to standard 35 mm DIN rails commonly used
in equipment cabinets and panels.
03-4125A04
Flat Mounting Bracket Kit
Brackets that attach to the bottom of the unit.
Used for mounting to a flat mounting surface.
03-4123A13
Power Cable
Mates with power connector on radio case
with 3-foot feedline.
03-1846A02
TD220 DB25 Adapter Board
Breakout board for the DB25 connector.
03-6139A01
PPS Cable for Adapter Board
Provides connection to the header on the
adapter board
03-4152A01
Amplifier/Timing Cable
Connects to the PPS cable and carries the
signal to the GPS connection and amplifier.
03-4224A01
DB9 to RJ11 Adapter
Custom MDS serial converter
73-2434A02
DB25 Ribbon Cable
6-inch DB25 straight cable to connect from
the radio to the adapter board
03-3828A01
DB25 Adapter Kit
Contains adapter board, I/O cable, serial
cable, ribbon cable, and DB9 adapters
03-4758A03
1.3 40-Watt Power Amplifier
Figure 2. 220 eNETL2T/U Power Amplifier
The ENETL2T/U is an RF power amplifier designed for use in the 216-222 MHz frequency range at up to
40 Watts. It is intended to serve as a 100% duty cycle amplifier for MDS TD and other radios operating in
point-to-multipoint repeater or base applications.
The power amplifier consists of an RF amplifier and PCB mounted to a heat sink, with a DC Power
interface, power control interface, and input/output RF connections on the sidewalls of the chassis. DC
power is supplied to the amplifier from a regulated and filtered DC source capable of supplying 10-16
VDC at a maximum current of 8 Amperes. The DC power source should be current limited or have a
protective fuse or circuit breaker.
For additional details on the power amplifier, please contact your local sales representative.

MDS 05-6906A01, Rev. R TD220MAX Technical Manual 3
2.0 PRODUCT DESCRIPTION
The GE MDS TD220MAX is a 25-Watt 220 MHz GMSK data radio intended for bridging messages over
the air between locomotives and wayside devices in rail applications or between ship and shore in
maritime applications. The data interface is Ethernet and uses the UDP/IP-based Simple
Timeslot/Frequency/Power Protocol (STFP), defined elsewhere. STFP can support various payload
protocols.
A time division channel access method is used by the TD220MAX for wireless communication. Each
second is divided into 8, 133-byte time slots. The radio further defines a multi-second epoch to allow the
effective number of time slots to be scaled according to system design. All radios in a system must be
configured with the same epoch size.
Precise synchronization of timing amongst radios is necessary for operation. Each radio can be
configured to use one of three timing sources: GPS, Precision Time Protocol (PTP), and over-the-air
(OTA). While system design can be flexible, a base radio installation typically uses either GPS or PTP
timing and a mobile radio typically uses OTA to synchronize to the wireless transmissions of a base radio.
Radios configured for GPS timing must be connected to an external GPS unit to receive NMEA sentence
information and the PPS signal. Radios configured for PTP timing will interact with a PTP Grandmaster
Clock over the Ethernet port using IEEE 1588 (PTPv2). Radios configured for OTA timing use messages
received wirelessly in the first timeslot of each second to maintain timing.
With its time slot definition and variable epoch size, the TD220MAX provides a generic TDMA
implementation that can be used by an external Communication Manager (CM) to support a variety of
TDMA schemes. A CM is responsible for making decisions regarding timeslot, frequency, power, and
payload organization. The TD220MAX is responsible for requesting data from a CM for upcoming
timeslots, forwarding messages received wirelessly to a CM, and wirelessly transmitting messages
received from a CM using the specified timeslot, frequency, and power. All communication between the
TD220MAX and a CM is done using STFP.
2.1 Front Panel Connectors and Indicators
Figure 3 shows the transceiver’s front panel connectors and indicators. These items are referenced in the
installation steps and in various other locations in the manual. The transceiver’s LED functions are
described in Table 6 on Page 12.
Figure 3. Front Panel Connectors & Indicators
LED
INDICATORS
SERIAL
CONNECTOR
(DB-25)
USB
CONNECTOR
DC INPUT
POWER
ANTENNA
CONNECTOR
(N FEMALE)

4 TD220MAX Technical Manual MDS 05-6906A01, Rev R
3.0 INSTALLATION PLANNING
This section covers pre-installation factors that should be considered when installing the transceiver in the
field. Careful planning will help achieve optimal performance from the transceiver. The specific details at
an installation site may vary, but there are four main requirements for installing the transceiver in all
cases:
•Adequate and stable primary power
•An efficient and properly installed antenna system
•Ethernet connection to local network
•Proper connections to a time source (PTP, GPS, Over-The-Air)
3.1 Chassis Dimensions
Figure 4 shows the external chassis dimensions of the TD220MAX Transceiver.
Figure 4. Transceiver Dimensions
3.2 Mounting Bracket Options
The transceiver is normally provided with flat mounting brackets attached to the bottom of the radio as
shown in Figure 5. An optional 35 mm DIN rail mounting bracket is also available and is described below.
5.625"
143 mm
7.25"
184 mm
2.0"
50 mm

MDS 05-6906A01, Rev. R TD220MAX Technical Manual 5
6.63"
168 mm
2.75"
70 mm
Figure 5. Mounting Bracket Dimensions
NOTE To prevent moisture from entering the radio, do not mount the case with the cable connectors
pointing up. Also, dress all cables to prevent moisture from running along the cables and into the
radio.
The figure above shows the mounting brackets at the furthest in (shortest distance) apart. The standard
mounting brackets can be mounted with the second pair of holes to increase the distance. The new width
of the radio with the mounting brackets would be 8.5 inches (216 mm).
3.2.1 Optional DIN Rail Mounting
The unit may be mounted with an optional 35 mm DIN Rail Mounting Bracket Kit (Part No. 03-4125A04).
Equipment cabinets and racks of modern design often employ this type of mounting. Once the DIN
bracket is attached to the radio, it allows for quick installation and removal of the radio from its mounting
rail without the need for tools.
The DIN Rail bracket attaches to the unit’s case along the left side of the transceiver (DB25 connector
side) with two screws. Ensure that the pull tab is located towards the back of the radio. The entire
assembly then attaches to the mounting rail with the connectors facing upwards.
3.3 Antennas and Feedlines
3.3.1 Antennas
The transceiver may be used with several different antennas. The exact style and gain factor depend on
the physical size and layout of your system. Connection is made to the radio via a N coaxial connector.
Contact your factory representative for details for Antennas available from GE MDS for this radio.
3.3.2 Feedlines
The selection of an antenna feedline is very important. Poor quality cable should be avoided as it will
result in power losses that may reduce the range and reliability of the radio system.

6 TD220MAX Technical Manual MDS 05-6906A01, Rev R
The table which follows, shows the approximate losses that will occur when using various lengths and
types of coaxial cable in 200 MHz band. Regardless of the type used, the cable should be kept as short
as possible to minimize signal loss.
Table 2. Signal Loss in Coaxial Cables (at 200 MHz)
Cable Type
10 Feet
(3 Meters)
50 Feet
(15 Meters)
100 Feet
(30.5 Meters)
200 Feet
(61 Meters)
RG-8A/U
0.26 dB
1.27 dB
2.50 dB
5.07 dB
1/2-inch HELIAX
0.06 dB
0.38 dB
0.76 dB
1.60 dB
7/8-inch HELIAX
0.04 dB
0.21 dB
0.42 dB
0.83 dB
1-1/4-inch HELIAX
0.03 dB
0.16 dB
0.31 dB
0.62 dB
1-5/8-inch HELIAX
0.025 dB
0.13 dB
0.26 dB
0.52 dB
3.4 Power
The transceiver may be operated from any well-filtered 10 to 16 VDC Power source; 13.8 VDC Nominal.
The supply must be capable of providing up to 7 Amps maximum, and 2.5 Amp consistently. With each
radio, an 03-1846A02 cable (as shown in Figure 6 below) is shipped, providing the matching power
connector on a 3-foot power cable. Ensure to tighten the connector securely to the radio. A surge
protection device such as a Transtector 1101-624 should be employed.
Figure 6. DC Power Cable (P/N 03-1846A02)
NOTE The radio is designed for use in negative ground systems only.
Consult the following table to determine how much current is required for receiving or transmitting vs.
input voltage and RF power output. Duty cycle is a function of how many time slots of the 8 per second
are used for transmission. The STFP protocol used by the communications manager to send data into the
radio for transmission over the air specifies what time slot to use for each. If the communications manager
uses all 8 slots, the duty cycle is 100%. If four are used every second, the duty cycle is 50%. If 7 are used
every 3 seconds (24 slots), the duty cycle is 29% (roughly 30%). Many other duty cycles are possible
depending on the epoch size and number of transmissions within each epoch. All MPE RF safety
calculations are based on the highest ERP levels.

MDS 05-6906A01, Rev. R TD220MAX Technical Manual 7
Table 3. Current Consumption vs Input Power and Duty Cycle
Voltage (V)
RF Power Out (W)
Duty Cycle (%)
Current Required (A)
Thermal
Dissipation (W)
12
0 (RX)
0
0.3
3.6
12
2
100
1.4
14
12
10
30
3.6
14
12
25
30
6.3
15
13.8
0 (RX)
0
0.3
4
13.8
2
100
1.2
14
13.8
10
30
3.2
14
13.8
25
30
5.5
15
3.5 Grounding Considerations
To minimize the chance of damage to the transceiver and connected equipment, a safety ground (NEC
Class 2 compliant) is recommended which bonds the antenna system, transceiver, power supply, and
connected data equipment to a single-point ground, keeping all ground leads as short as possible.
Normally, the transceiver is adequately grounded if the supplied flat mounting brackets are used to mount
the radio to a well-grounded metal surface. If the transceiver is not mounted to a grounded surface, it is
recommended that a safety ground wire be attached to one of the mounting brackets or a screw on the
transceiver’s case.
The use of a lightning protector is recommended where the antenna cable enters the building; bond the
protector to the tower ground, if possible. All grounds and cabling must comply with applicable codes and
regulations.
3.6 Data Interface (DB-25)
The Data Interface has several ports integrated into one connector: Ethernet, COM1 and COM2 Serial
Ports, and GPS signaling.
Figure 7. COM Connector (DB-25F)
As viewed from outside the unit

8 TD220MAX Technical Manual MDS 05-6906A01, Rev R
Table 4. DB25 Serial Interface Pinouts
DB-25
Pin
Signal
Direction WRT MDS
Equipment
Notes
1
Not Connected
N/A
Reserved
2
COM2_TXD
Input
GPS NMEA Port
3
COM2_RXD
Output
GPS NMEA Port
4
COM2_RTS
Input
GPS NMEA Port
5
COM2_CTS
Output
GPS NMEA Port
6
Not Connected
N/A
Reserved
7
GND
Input/Output
Ground
8
EXT_ALARM
Output
See External Alarm Sense in section 5.3
9
Not Connected
N/A
Reserved
10
Not Connected
N/A
Reserved
11
Not Connected
N/A
Reserved
12
Not Connected
N/A
Reserved
13
GND
Input/Output
Ground
14
ETH_TX_H
Output
Ethernet
15
ETH_TX_L
Output
Ethernet
16
ETH_RX_H
Input
Ethernet
17
ETH_RX_L
Input
Ethernet
18
EXT_KEY
Output
Reserved –Power Amplifier
19
EXT_DET
Input
Reserved –Power Amplifier
20
COM2_DTR
Input
GPS NMEA Port
21
Not Connected
N/A
Reserved
22
GPS_PPS_L
Input
Not Connected
23
GPS_PPS_H
Input
TTL level 1PPS signal input. 0 to 5 VDC nominal.
24
COM1_RXD
Input
Console
25
COM1_TXD
Output
Console
3.6.1 Adapter Board
GE MDS has available a breakout adapter board that separates the DB25 connector into an Ethernet
port, PPS port, as well as three COM connectors. This board is for controlled environment applications
only. For additional details regarding the adapter board, view the “TD_RCL”adapter board instruction
sheet located here http://www.gegridsolutions.com/app/resources.aspx?prod=td-series&type=9.

MDS 05-6906A01, Rev. R TD220MAX Technical Manual 9
Figure 8. 03-6139A01 Adapter Board Top View
Figure 9. 03-6139A01 Adapter Side View
3.7 USB
The radio provides a USB Port conforming to version 1.1 of the USB standard. This port is provided for
features such as logging STFP messages to text files on a memory stick. Consult GE MDS for information
on this feature. The pinout for this connector is given in the table below.
Table 5. USB Port Pinout
Pin
Signal Name
Description
1
PC_USB_+5V
+5 VDC
2
USBD-
USB Data Minus
3
USBD+
USB Data Plus
4
GROUND
Ground
PPS
Connector
Ethernet
(RJ45)
COM 2
(RJ45)
Not
Used
COM 1
(RJ11)

10 TD220MAX Technical Manual MDS 05-6906A01, Rev R
3.8 Antenna Connector
The Antenna Connector is a type N female connector with 50-Ohm characteristic impedance. A suitable
lightning arrestor such as a Polyphaser VHF50HN should be employed when indicated by applicable
standards or codes.

MDS 05-6906A01, Rev. R TD220MAX Technical Manual 11
4.0 STEP-BY-STEP INSTALLATION
In most cases, the steps given here are sufficient to install the transceiver.
1. Mount the transceiver. Attach the mounting brackets to the bottom of the transceiver case (if not
already installed), using the four 6-32 x 1/4-inch (6 mm) screws supplied. Mounting bracket
dimensions are shown in Figure 5 on Page 5. Secure the brackets to a flat, grounded surface. (If
a grounded surface is not available, run a separate ground wire to the transceiver —see
Grounding Considerations on Page 7.)
2. Install the antenna and feedline. The antenna used with the radio must be designed to operate
in the radio’s frequency band and be mounted in a location providing a clear path to the
associated radio(s).
3. Connect primary power. Input power must be within 10 to 16 VDC and capable of providing up
to 7 Amperes maximum.
The unit is designed for use with negative-ground systems only. The power supply should be
equipped with overload protection (NEC Class 2 rating), to protect against a short circuit between its
output terminals and the radio’s power connector.
4. Configure Basic Settings. Connect a PC to the radio and access the radio’s menu system. See
the following section on details in communicating with the radio.
4.1 Logging On
The radio has a menu system that can be accessed in one of two ways:
•Terminal Emulator—Use a terminal emulator program on your PC, such as HyperTerminal or
PuTTy, connected directly to the TD220MAX COM1 port via a serial cable.
•Telnet—Text-based access to the menu system through a network connection.
The serial console is typically used to configure the network parameters prior to connecting to the radio
via Telnet remotely. Each radio is assigned a default IP Address, a Netmask, and a Gateway IP Address.
These are as follows;
•IP Address: 192.168.1.1
•IP Netmask: 255.255.255.0
•IP Gateway: 0.0.0.0.
The IP Address and Netmask should be chosen carefully. The radio will network directly with other
equipment with IP Addresses that are on a common Subnet. IP Addresses that begin with the same
numerical IP address bits where the Netmask is one will be on the same Subnet. For example, if the IP
Address is 10.4.100.1 and the Netmask is 255.255.0.0, the radio will attempt direct Ethernet
communication with any node whose IP Address begins with 10.4. If a message is bound for a node
outside of the 10.4 network, it will be sent to the Gateway IP address instead so that it can be placed from
the radio’s subnet onto another subnet.
4.1.1 Serial Console
For accessing the COM1 console, use a serial terminal emulator program such as HyperTerminal or
PuTTy. The default settings are: baud rate 19200, no parity, 8 data bits, and 1 stop bit. The pins for this
port are listed in Section 3.6. The serial console is typically used to configure the network parameters to
connect to the radio via Telnet remotely.
1. Log in to the radio on its COM1 console using a serial terminal emulator program.
2. If you wish to change the default IP settings, go to the IP Configuration menu.
oSet the IP address, the Netmask and the Gateway.
3. Verify network connectivity by going to the Maintenance/Tools Menu and select the Ping Utility.
oEnter the IP address of a known node on the network.
4. Execute the Ping and observe the results. If the network interface is working properly, Ping
responses should be received.

12 TD220MAX Technical Manual MDS 05-6906A01, Rev R
4.1.2 Telnet Console
NOTE It is not recommended to change the default IP settings via the Telnet interface. Networking
changes should be done locally via the serial console and then deployed in the field. See the
section above on modifying these networking parameters.
On newer computers, the default telnet function on Windows machines may be disabled. This can be
fixed by following step by step instructions located online. To either confirm that the telnet function is
enabled or properly turned on;
1. Use a program that has a telnet function built in or launch a Windows DOS window.
2. Enter the command telnet <radio IP address>.
i. If the connection fails, perform a ping to the radio’s IP address to confirm
connectivity. If pings succeed, the telnet feature may not be enabled.
ii. If pings fail, then use the serial console to check settings and connectivity.
iii. If the telnet functions, login to the radio.
4.2 Initial Startup & Checkout
In-service operation of the transceiver is completely automatic. Once the unit has been properly installed
and configured as described above, operator actions are limited to observing the front panel LED
indicators for proper operation.
If all parameters are correctly set, operation of the radio can be started by following these steps:
1. Apply DC power.
2. Observe the LED status panel for proper indications.
Table 6. LED Status Indicators
LED Name
Description
PWR
• Continuous — Power applied, no problems detected.
• Rapid flash (5 times-per-second) —Alarm indication
ETH
• Flashing/On —Data is being transmitted and received.
• Off — Ethernet signals not detected
TX
When lit, indicates data transfer between the Base and Mobile Radios.
RX
When lit, indicates data transfer between the Base and Mobile Radios.
4.3 Upgrade the Firmware
4.3.1 Introduction
From time-to-time MDS will offer upgrades to the TD220MAX firmware. Uploading new firmware into the
radio does not require that the radio be taken off-line until you want to operate the radio from the new
firmware image.

MDS 05-6906A01, Rev. R TD220MAX Technical Manual 13
Firmware images are provided free-of-charge on the MDS Web site at: www.gemds.com. Use the product
lookup to search for TD Series.
4.3.2 Installing TD220MAX Firmware by TFTP
To use this function the user will need:
•A PC with a TFTP server running.
•The IP address of the PC running the TFTP server.
If you do not know your computer’s address on a Windows PC, you can use the RUN function from the
Start menu and enter ipconfig to determine your local PC’s IP address. The IP address of the radio can
be found on the Starting Information Screen (see Page 16).
4.3.3 Reprogramming Procedure
To upload a new firmware file (TDM-krmd-X_Y_Z.mpk) into the TD220MAX unit use the following
procedure:
1. Launch a TFTP server on a PC connected either directly or via a LAN to the Ethernet port (LAN)
of the radio. Set the TFTP server’s outgoing path to the directory containing the firmware image
file.
2. Connect to the radio’s menu system by whichever means is convenient: Telnet via the LAN or
Terminal emulator via the COM1 port.
3. Go to the Reprogramming Menu (See Reprogramming Menu for more detailed information).
4. Fill in the information for the:
oTFTP Host Address –IP Address of the server (host computer) running the TFTP server.
oFirmware Filename –Name of the file (TDM-krmd-X_Y_Z.mpk) to be pulled from the
TFTP server holding the firmware file.
5. Select Retrieve File to start the reprogramming and receive the firmware file through the TFTP
server.
NOTE The uploaded firmware image file replaces the “inactive image” file and will be automatically
verified.
6. Check the FW version shown for the inactive image to verify that the download has completed
successfully
7. Reboot the TD220MAX radio to the inactive image which now contains the newly downloaded
firmware.
8. Test the radio for normal operation.
9. End of procedure.
4.4 Set Up a GPS Base Unit
1. Connect the RS-232 NMEA serial data output from the GPS receiver to the Base Radio via the
radio’s COM2 port. Drive serial data into the radio on DB-25 pin 2.
2. Connect the GPS’s PPS output to the Base Radio. Drive TTL into the radio on DB-25 pin 23.
3. Log in to the radio.
4. Go to the GPS Configuration Menu.
a. Verify/modify the GPS NMEA baud rate and PPS polarity to match the connected GPS.
5. Go to the System Configuration Menu.
a. Set the timing source to GPS and allow the radio to reboot.
6. Logging in again after the reboot, verify that the radio’s Device Status is OPERATIONAL as shown
on the Starting Information Screen. If not, enter ‘A’ to get a list of the current alarms and correct
the alarm condition.
7. Go to the STFP Configuration Menu (Under the System Configuration Menu)
a. Set the STFP radio ID from the default 0 (it’s recommended).

14 TD220MAX Technical Manual MDS 05-6906A01, Rev R
b. Set the IP Port on which the base will receive STFP messages from the Communication
Manager.
c. Set the IP Address of the Communication Manager to which timing markers and
messages received from mobiles should be sent.
d. Set the IP Port of the Communication Manager to which timing markers and messages
received from mobiles should be sent.
e. Set the epoch size to match the same value configured on the neighboring radios and
reboot if necessary.
f. Set the STFP slot delay as necessary. This number, multiplied by 125ms, represents the
slot delay allowed from when a timing marker is sent to the Communication Manager to
when a data message must be received from the Communication Manager. For most
cases the default value of 3 should suffice.
8. Go to the Ping Utility Menu (Under the Maintenance/Tools Menu).
a. Verify the Ethernet link using the Ping utility.
9. Begin sending STFP data.
10. Verify the TX LED illuminates and the radio begins transmitting over the air.
4.5 Set Up a PTP Base Unit
1. Install and configure a PTP Grandmaster Clock. The clock must be accessible to the Base Radio
through the Ethernet Link. The base may interface to an external Communication Manager using
the Ethernet Link; therefore, an external switch or router may be required.
2. Log in to the radio.
3. Go to the PTP Configuration Menu.
a. Choose the PTP Profile for the Base to match with the settings on the Grandmaster
Clock.
b. If Telecom profile is selected in step a, set PTP Unicast Master to the IP address of the
Grandmaster Clock.
4. Go to the System Configuration Menu.
a. Set the timing source to PTP and allow the radio to reboot.
5. Logging in again after the reboot, verify that the radio’s Device Status is OPERATIONAL as shown
on the Starting Information Screen. If not, enter ‘A’ to get a list of the current alarms and correct
the alarm condition.
6. Go to the STFP Configuration Menu (Under the System Configuration Menu).
a. Set the STFP radio ID from the default 0 (it’s recommended).
b. Set the IP Port on which the Base will receive STFP messages from the Communication
Manager.
c. Set the IP Address of the Communication Manager to which timing markers and
messages received from mobiles should be sent.
d. Set the IP Port of the Communication Manager to which timing markers and messages
received from mobiles should be sent.
e. Set the epoch size to match the same value configured on the neighboring radios and
reboot if necessary.
f. Set the STFP slot delay as necessary. This number, multiplied by 125ms, represents the
slot delay allowed from when a timing marker is sent to the Communication Manager to
when a data message must be received from the Communication Manager. For most
cases the default value of 3 should suffice.
7. Go to the Ping Utility Menu (Under the Maintenance/Tools Menu).
a. Verify the Ethernet Link using the Ping utility.
8. Begin sending STFP data.
9. Verify the TX LED illuminates and the radio begins transmitting over the air.