Trango Broadband Wireless M915S User manual

M915S™
900 MHz Wireless Broadband System
USER MANUAL
December 15, 2005
Revision A
for Firmware Version 2.0

Table of Contents Trango
Trango Broadband Wireless — M900S User Manual Rev. C page ii
Table of Contents
Preface ........................................................................................................................................................................... iv
FCC Information ....................................................................................................................................................... iv
Warranty Information ................................................................................................................................................ iv
Firmware Notifications.............................................................................................................................................. iv
Section 1 Introduction..................................................................................................................................................... 1
Overview .................................................................................................................................................................... 1
SmartPolling™ & Bandwidth Throttling.................................................................................................................... 2
Auto-retransmit Feature (ARQ).................................................................................................................................. 2
Section 2 Hardware Overview ........................................................................................................................................ 3
M915S AP and SU Hardware Components................................................................................................................ 3
Section 3 Getting Started ................................................................................................................................................ 4
Connections and Power .............................................................................................................................................. 4
Radio Management Concepts ..................................................................................................................................... 5
Browser Interface ....................................................................................................................................................... 6
Command Line Interface ............................................................................................................................................ 8
Telnet...................................................................................................................................................................... 8
Troubleshooting...................................................................................................................................................... 9
Section 4 Basic Configuration via Browser Interface................................................................................................... 10
Configuring the AP’s Subscriber Unit Database (SUDB) ........................................................................................ 10
Configure Other Basic AP Parameters ..................................................................................................................... 12
Configure Basic SU Parameters ............................................................................................................................... 14
LED Summary.......................................................................................................................................................... 15
RF Link Loopback Test............................................................................................................................................ 16
SU Ranging Test....................................................................................................................................................... 17
Advanced Setup Page ............................................................................................................................................... 17
Other Key Parameters............................................................................................................................................... 18
Site Survey Page....................................................................................................................................................... 19
Section 5 Basic Configuration via CLI ......................................................................................................................... 20
Access Point Basic Settings...................................................................................................................................... 20
Subscriber Unit Database (SUDB) Settings ............................................................................................................. 23
Subscriber Unit Basic Settings ................................................................................................................................. 24
Section 6 Mounting Hardware...................................................................................................................................... 27
Cabling and Grounding Considerations.................................................................................................................... 29
Section 7 Deployment................................................................................................................................................... 31
Site Selection ............................................................................................................................................................ 31
Site Survey ............................................................................................................................................................... 31
AP Search and SU Antenna Alignment .................................................................................................................... 32
Link Management Commands.................................................................................................................................. 34
ARQ with Selected Repeat and Multirate Feature.................................................................................................... 37
Section 8 Management.................................................................................................................................................. 38
Radio Management Access Via TCP/IP................................................................................................................... 38
SU Management from AP ........................................................................................................................................ 38
Loading Multiple SUs into the SUDB using DLOAD Command ............................................................................ 39
SNMP ....................................................................................................................................................................... 39
Objects for Monitoring and Control ......................................................................................................................... 40
SNMP Setup ............................................................................................................................................................. 41
Appendix A Command Set Reference .......................................................................................................................... 42
Appendix B Specifications ........................................................................................................................................... 46

Table of Figures Trango
Trango Broadband Wireless — M900S User Manual Rev. C page iii
Table of Figures
Figure 1: Typical Deployment ....................................................................................................................................... 1
Figure 2: Basic Components of an M915S Radio.......................................................................................................... 3
Figure 3: Bottom of Radio ............................................................................................................................................. 3
Figure 4: Back of Radio................................................................................................................................................. 4
Figure 5: Side of Radio & Location of Reverse Polarity SMA Connector .................................................................... 4
Figure 6: Wiring Diagram.............................................................................................................................................. 5
Figure 7: LED Summary.............................................................................................................................................. 15
Figure 8: LED and Reset Button Window ................................................................................................................... 15
Figure 9: M915S Mounting Hardware Assembly ........................................................................................................ 27
Figure 10: Alternative Mounting ................................................................................................................................. 28
Figure 11: Articulation for M915S with Mono Pod Mount (not supplied) .................................................................. 29
Figure 12: Grounding of the Radio.............................................................................................................................. 29

Preface
Trango Broadband Wireless — M900S User Manual Rev. C page iv
Preface
This manual covers basic configuration and installation of the M915S Wireless Broadband System and applies to
the following radio part numbers:
M915S-AP 900 MHz Access Point
M915S-SU 900 MHz Subscriber Unit with integrated antenna and connector for external antenna
FCC Information
This device complies with Part 15 of FCC Rules and Regulations. 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.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and radiates radio-frequency energy; if not installed and
used in accordance with these instructions, the unit may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in any particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to correct the interference by one of more of the following measures:
1) Reorient the antenna.
2) Increase the separation between the affected equipment and the unit.
3) Connect the affected equipment to a power outlet on a different circuit from that which the receiver is
connected to.
4) Consult the dealer and/or experienced radio/TV technician for help.
FCC ID: NCYM915S
Canada: 2945A-M915S
IMPORTANT NOTE: Intentional or unintentional changes or modifications must not be made unless under the
express consent of the party responsible for compliance. Any such modifications could void the user’s authority to
operate the equipment and will void the manufacturer’s warranty. To comply with FCC RF exposure requirements,
the following antenna installation and device operating configurations must be satisfied. The antenna for this unit
must be fixed and mounted on an outdoor permanent structure with a separation distance of at least two meters
from all persons. Furthermore, it must not be co-located or operated in conjunction with any other antenna or
transmitter.
Warranty Information
Radios from Trango Broadband Wireless are warranted from one year from date of purchase. Please see
www.trangobroadband.com for a complete description of warranty coverage and limitations.
Firmware Notifications
To receive email notifications regarding firmware upgrades and product announcements, register at
http://www.trangobroadband.com/mailinglist/mailingListAdd.aspx

Introduction
Trango Broadband Wireless — User Manual M915S Rev. 1 Page 1
Section 1 Introduction
Your Trango Broadband M915S radio system provides a reliable and robust means to deliver broadband access to a
wide geographic region through wireless Ethernet connectivity. This section will familiarize you with basic
operational concepts, as well as an overview of the various components and hardware of the M915S system.
Overview
The M915S is a highly versatile and cost effective outdoor point-to-multipoint solution for wireless broadband
service providers’ enterprise connectivity applications. The M915S delivers 3 Mbps over the air, and operates in the
900 MHz license free ISM band. Each radio includes an integrated dual polarized (horizontal and vertical) antenna,
as well as a connector for the attachment of an external antenna, such as a Yagi or an omni style antenna. Note: If
you are going to install an external antenna, refer to the M915S Professional Installation Guide. Contact
Technical Support for access to the Professional Installation Guide.
The M915S system consists of two types of radios: Access Points (APs) and Subscriber Units (SUs). Up to 126
subscriber units can be supported by a single AP, which acts as a hub in a star configuration. The AP delivers
wireless broadband service (Ethernet connectivity) to one or more SUs according to a proprietary adaptive dynamic
polling algorithm called SMARTPolling™. The M915S radio units are backward compatible with M900S radios
such that an M915S-AP may be used with M900S-SUs and M915S-SUs may be used with M900S-APs. The main
difference in the design is a better front/back ratio on the internal patch antenna to improve co-location at tower
sites, a redesigned digital section on the printed circuit board, and a new package for the M915S-SU. Network
operators can co-locate multiple APs at a single cell site, thus increasing the aggregate throughput available at each
wireless point of presence (POP).
Figure 1: Typical Deployment
The AP typically resides at the center of the point-to-multipoint (PMP) network. It performs all management
functions, including the allocation of bandwidth for all associated SUs. The M915S AP provides a host of
comprehensive tools and functions.
The M915S system is classified as a Layer 2 multi-point bridge, thus all forms of Ethernet traffic will pass
seamlessly over the system. There is no limitation on the number of IP addresses or hardware devices to which an
individual subscriber unit may be connected.
Authentication of Subscriber Units is performed using a secure proprietary method, which is based on the MAC
address of the subscriber units. In order to establish a wireless link, the MAC address of the SU must be present in
the Access Point’s SUDB.
Both APs and SUs are IP addressable and can be managed remotely across the network. Users can manage the
radios using the telnet command line interface or the graphical HTTP browser interface. The M915S also provides
remote firmware upgrade capability utilizing TFTP. APs include a full-featured SNMP agent for the monitoring
and controlling of both APs and SUs via SNMP.

Introduction
Trango Broadband Wireless — User Manual M915S Rev. 1 Page 2
The M915S radios are powered using "power-over-Ethernet" for ease and low-cost installation. A single Cat-5
cable caries both Ethernet and DC power to the radio.
Both APs and SUs feature a handy "site survey" tool to check for interference, as well as RSSI tools for optimizing
antenna positioning. The M915S also features variable receiver threshold, full power control, dual polarized
antennas, and various link diagnostic tools.
SmartPolling™ & Bandwidth Throttling
One of the major advantages of the M915S system is the ability of the AP to handle multiple SU
connections and share the 3 Mbps data throughput efficiently. Bandwidth allocation is managed by the
AP’s SMARTPolling algorithm according to provisioning rules set up by the system administrator. The
AP polls each SU in a round robin format to determine if the SU has data to transfer. The SU only
transmits the data “upstream” to the AP when the AP gives authorization via a “transmit grant.” The SU
passes every “downstream” data packet from the AP and identifies packets intended for it. In order for an
SU to communicate with an AP, the system administrator must first add the MAC address and ID number
of the SU to the SUDB in the AP. The SmartPolling algorithm will poll active SUs more often, thus
making the most efficient use of the 3 Mbps bandwidth. Several other parameters are considered in the
SmartPolling algorithm including upstream/downstream committed information rate (CIR),
upstream/downstream maximum information rate (MIR), and Priority Setting.
Each of the above parameters is set in the AP by the system administrator and cannot be controlled at the
SU. These parameters will be covered in greater detail later in this text.
When power is first applied to a properly installed SU, it will scan all available channels listening for a
grant from an AP that has a matching Base ID and the SU’s MAC in the its SUDB. The SU will then stop
on that channel and respond to the AP using maximum RF power. Before the AP can add the SU to the
polling list, it must authenticate the SU by verifying the MAC address and performing a ranging operation
to the SU. Upon successfully locating and ranging the SU, the AP will then add the SU to the normal
polling list. Once the AP is regularly polling the SU, the SU is said to be “associated” to the AP.
Once associated, the AP will send a command to the SU to adjust the SU’s RF transmit power based on the Target
RSSI parameter set in the AP. This process is referred to as “power leveling”.
System operators may limit allowable bandwidth to specific customers utilizing the built-in CIR and MIR settings
(measured in kbps) for each SU.
Auto-retransmit Feature (ARQ)
The M915S features ARQ or “Automatic Request for Re-transmission,” which is the ability to correct for missing
or corrupted packets of data by requesting the sending radio to re-transmit the data. Both the AP and SU units
implement a form of ARQ known as “ARQ with Selected Repeat.” The use of ARQ is especially important in
areas of high interference. The ARQ feature can be turned on or off.

Hardware Overview
Trango Broadband Wireless — User Manual M915S Rev. 1 Page 3
Section 2 Hardware Overview
This section provides details about each radio in the M915S family. The M915S-SU and M915S-AP include built-
in, electronically switchable, dual-polarized antennas, as well as a reverse polarity SMA connector for the
attachment of an external antenna. Both units are designed for outdoor installation, and are powered by power-
over-Ethernet (POE) for ease of installation. The M915S Access Point, as well as the M915S subscriber units,
provide channels of operation within the 900 MHz ISM band that spans from 902 MHz to 928 MHz. The channel
width is 6 MHz, and the default channel assignments allow for 4 non-overlapping channels.
M915S AP and SU Hardware Components
Each radio comes equipped with a power-over-Ethernet (PoE) J-Box, an AC adapter, and mounting hardware.
Radio (MU or RU) antenna
Power Supply (120 VAC-24 VDC)
J-Box (Power-over-Ethernet Injector)
Mounting Hardware
4X
8X
2X
Figure 2: Basic Components of an M915S Radio
Figure 3: Bottom of Radio
At the bottom of the M915S are two access ports: a twist-on weatherproof cable port for RJ-45 Ethernet (and PoE),
and a translucent access cover plug over the unit’s diagnostic LEDs and reset button. The LEDs will be discussed
later in this text.

Getting Started
Trango Broadband Wireless — User Manual M915S Rev. 1 Page 4
Figure 4: Back of Radio
The radio’s model number, FCC ID, MAC ID, and Serial number, are located on the backside of the radio.
6.300
.600
Figure 5: Side of Radio & Location of Reverse Polarity SMA Connector
Section 3 Getting Started
This section explains how to power your radios, establish TCP/IP connectivity to the radios, as well as how to
access the HTTP browser and the command line interfaces.
Connections and Power
Connections and powering of the radios is the same for APs and SUs.
• Connect a Cat-5 (straight through) Ethernet cable (we recommend shielded twisted pair) between the ODU
(out door unit) port of the J-box and the RJ-45 connector on the radio. Note that this cable will carry
power-over-Ethernet (PoE).
Trango Broadband Wireless
MODEL: M915S-AP Rev. A
ACCESS900 (TM)
S/N: 00000XXXX
MAC: 00 01 DE 00 02 F3
FCC ID: NCYM915S
CANADA: 2945A-M915S
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES: OPERATION IS
SUBJECT TO THE FOLLOWING CONDITIONS: 1) THIS DEVICE MAY NOT CAUSE
HARMFUL INTERFERENCE, AND 2) THIS DEVICE MUST ACCEPT ANY
INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION

Getting Started
Trango Broadband Wireless — User Manual M915S Rev. 1 Page 5
• If connecting to a COMPUTER, use a Cross-Over Ethernet cable from the NET port of the J-box to the
computer’s Ethernet port.
If connecting to a HUB, SWITCH, or ROUTER, use a Straight-Thru cable.
• Plug the AC adapter into an AC outlet.
CAT-5
STRAIGHT-THRU CABLE
24 VOLT POWER
SUPPLY
AC POWER
M900S (AP o
r
SU)
POWER-OVER-ETHERNET
J-BOX
INDICATES POWER TO RADIO
INDICATES POWER TO J-BOX
NETWORK
OR
COMPUTER
USE STRAIGHT-THRU CABLE
USE CROSS-OVER CABLE IF TO COMPUTER
IF TO HUB, SWITCH, OR ROUTER
CAT-5
Figure 6: Wiring Diagram
Both green LEDs on the J-box should be lit, indicating power is present at the J-box as well as the radio.
You are now ready to configure the radio via the Ethernet port.
Radio Management Concepts
Proper connections to the radios and careful IP/routing & planning will enable the network administrator to access
and manage the radios via TCP/IP remotely over the network. Radio management over TCP/IP can be performed
from computers connected to the Ethernet side of each radio. Computers connected to the AP can manage the SU
over the wireless connection. Computers connected to the SU can manage the AP, provided that switch 7 (TCP/IP
for SU) is enabled on the AP. Switches will be covered later in this text.
Opmode
To fully understand radio management of the M915S system, it is important to be familiar with the concept of
operation mode or “Opmode.”
APs and SUs can be in one of two Opmodes (“ON” or “OFF”). When in Opmode “OFF,” the AP is not
transmitting and it is not attempting to associate with SUs. Alternatively, when in Opmode “ON,” the radio is
transmitting and is attempting to associate.

Getting Started
Trango Broadband Wireless — User Manual M915S Rev. 1 Page 6
Several functions, such as the site survey function and the SU RSSI function, can only be performed while the radio
is in a particular Opmode. See Appendix A – Command Set Reference for a complete listing of commands, and the
appropriate Opmode(s) for each command.
Switch Settings
M915S firmware includes several “switches” that are used to set certain operational parameters of the radios.
Switch settings can be changed via the HTTP browser interface or the command line interface. For purposes of
radio TCP/IP management, the following four switches are important:
Switch 2 (SU) - TCP/IP access to SU from the AP’s side of the network requires that the SU’s switch 2 (SW 2 –
TCP/IP for AP) be ON. Default setting for SW 2 (from factory) is ON.
Switch 5 (AP and SU) – In order to utilize the radio’s HTTP Browser interface, switch 5 (SW 5 – Enable HTTP)
must be ON. Default setting for SW 5 (from factory) is ON.
Switch 6 (SU) - TCP/IP access from Ethernet port of SU requires that switch 6 (SW 6 – TCP/IP Service for
Ethernet Port ) be ON. Default setting for SW 6 (from factory) is ON. If SW 6 is OFF, TCP/IP access to SU
from it’s Ethernet port is possible only if the SU’s Opmode is “OFF.”
Switch 7 (AP) – TCP/IP access to AP from SU’s side of network requires that the AP’s switch 7 (SW 7 –
TCP/IP for SU) be ON. Default setting for SW 7 (from factory) is ON.
Passwords
In order to login to an M915S radio (either through telnet or through the web browser interface), the user must
know the IP address and password. Both APs and SUs feature two levels of passwords, Read Write (RW) and
Read Only (RO). Be sure to change both passwords (RW and RO) prior to deployment on a live network.
Passwords can be changed using the “password ro and password rw command in either the CLI interface or in the
command console of the browser interface.
Reset Button
Pressing the reset button will reset the radio’s IP address and password back to the factory defaults.
Default IP (192.168.100.100) Default Password (trango)
Browser Interface
The M915S (both AP and SU) features a convenient and easy-to-use web based configuration and management
tool. No additional software is needed on your computer other than a web browser. Most functions can be
performed using the browser interface, although several functions can only be performed via command line
interface (CLI). The browser interface also includes a Command Console page that allows the user to enter most
CLI commands without leaving the browser interface.
To use the browser interface, the following must be present:
• An Ethernet connection between a PC and the radio
• Ethernet PC connection with IP/subnet that is routable to the radio
• SW 5 ON (default)
• A web browser on the PC (i.e. Microsoft Internet Explorer)
In order to use the browser interface – simply connect the radio to a PC and type the radio’s IP address (default IP
address=192.168.100.100) into the web browser (i.e. Microsoft Internet Explorer). This will bring up the Login
page.
NOTE: Login pages for the AP and SU are similar.

Getting Started
Trango Broadband Wireless — User Manual M915S Rev. 1 Page 7
Browser Interface Login Page
Type the password (default trango) and continue. This will bring up the radio’s System Information page.
Web Browser System Information Page
Note: System Information page for the SU is similar and is covered in detail later in this text.

Getting Started
Trango Broadband Wireless — User Manual M915S Rev. 1 Page 8
Primary Features and Pages of the Browser Interface:
Navigation Column: Each page features a navigation column that runs along the left-hand side of the page. The
model number of the radio is listed at the top of the navigation column. On the bottom of the navigation column is
the current status of the radio including its Base ID, current Opmode, channel, antenna selection, and frequency.
The navigation column also features links to each of the following pages:
System Information: This page shows most of the basic configuration parameters of the radio. It is the first page
shown after login.
Configuration:The essential parameters, such as Base ID, IP, Subnet, gateway, channel, and antenna polarization,
are set here.
Advanced Setup:The advanced RF parameters, such as transmit power, receiver threshold control, and channel
center frequencies, are set here.
Site Survey:With Opmode “Off” the user can conduct a spectrum analysis using this page.
Subscriber Database: This is the page for defining which SUs can associate to the AP.
Link Control: This page shows which SUs are associated. This page also provides several tools for evaluating the
quality of the wireless link.
Command Console:From this page, the user can run any console command that is not interactive (i.e. ipconfig)
or time sensitive (su linktest). For a complete list of console commands, type "help" or “?” in the entry field.
Logout: This link will end the current browser session with the radio.
Help:The Browser Interface features useful Help pages that explain all listed parameters. To access the Help
pages click on the Help link.
Command Line Interface
Although most radio functions can be managed via the browser interface, the command line interface (CLI)
provides slightly more functionality, and is usually the management tool of choice for experienced users. The CLI
can be accessed through Telnet.
Telnet
Open a command prompt (DOS) session on your PC. Open a Telnet session by typing:
telnet [ip address of radio]
All Trango radios are pre-configured at the factory with a default IP address of 192.168.100.100. The factory
default password is trango. Once you connect to the radio you will be greeted with the current hardware and
firmware information and prompted for a password. Type in the read-write (RW) password and press enter.
Example:
C:>telnet 192.168.100.100
Welcome to Trango Broadband Wireless M915S-AP 1p0H8005D04030101
Password:
#>
To terminate a CLI session (Telnet or Serial) type the command logout.
Note: Type help or ?for a listing of all the CLI commands. Type help <command>, for the syntax of a
particular command.

Getting Started
Trango Broadband Wireless — User Manual M915S Rev. 1 Page 9
Example (to view a list of all commands which start with su)
#> ? su
su [all | <suid, 1..126>]
su info <suid, 1..126>
su linktest <suid, 1..126>
su password <suid|all> <rw|ro> <new password> <new password>
su ping <suid, 1..126>
su reboot <suid|all>
su sw <suid|all> <sw#, 0..7> <on | off>
su testrflink <suid, 1..126> <r>
su testrflink <all> <r>
sudb add <suid, 1..126> <pr|re> <device id,hex>
sudb cirmir <<suid>|all> <cir dn> <cir up> <mir dn> <mir up>
sudb defaultcirmir [<cir dn> <cir up> <mir dn> <mir up>]
sudb delete <<suid>|all>
sudb dload
sudb gid <<suid>|all> <0..15>
sudb view
survey <time, 1..10 sec> <antenna, h|v|e>
NOTE: The majority of the CLI commands will be covered throughout this text as well as in Appendix A −
Command Set Reference.
Troubleshooting
If you can not telnet into the radio or open a browser session, check cable connections, ensure proper use of cross-
over vs. straight-through cable, and ensure PC’s subnet is routable to radio’s IP address. If you still cannot access
the radio’s management interfaces, consult the troubleshooting guide that is available at
www.trangobroadband.com in the Technical Support area of the website.

Basic Configuration via Browser Interface
Trango Broadband Wireless — User Manual M915S Rev. 1 Page 10
Section 4 Basic Configuration via Browser Interface
This section describes a few more basic concepts, as well as how to establish a wireless link using the Browser
(HTTP) Interface. This section is written to address only the most basic steps in establishing a link in the lab or a
bench-top environment. It is highly recommended that you read the other sections of this manual to gain an
understanding of all important configuration parameters and procedures prior to deploying your equipment.
In this section you will:
• Learn about AP and SU Basic Configuration Screens and Parameters
• Populate the AP’s Subscriber Unit Data Base (SUDB) with at least one SU
• Configure Other Basic AP Parameters
• Configure Basic SU Parameters
• Establish a Wireless Link
• Evaluate Link Quality
The M915S uses the concept of “association” to indicate that the APs and SUs are communicating. If all
parameters are properly set, the AP will begin actively searching for the SUs in its SUDB. Once an active SU is
detected, the authentication and association process will begin.
Essentials for Establishing a Wireless Link with M915S Series Radios
• Base ID in AP and SU must match
• MAC Address of SU must match an entry in the SUDB
• SU must be set to “autoscan” all channels, or it’s channel must be fixed on the same channel as the AP
• AP must be in Opmode “ON”
• SU must be in Opmode “ON”
• Adequate signal strength must be received at each radio
If all of these parameters are met, the wireless link will automatically establish itself and Ethernet traffic will begin
to pass between the radios.
Note: This section utilizes the Browser Interface as the configuration tool. For the equivalent procedure using
CLI commands, see Section 5.
Configuring the AP’s Subscriber Unit Database (SUDB)
Prior to establishing a wireless link, the user must configure the SUDB in the AP with each SU’s MAC address and
related settings. The SUDB includes information about each SU. Click on the Subscriber Database page to add,
modify, and delete SUs. The key information for each SU includes the following:
SU ID: User Definable subscriber unit ID (1…126)
TYPE: PR Priority or REG Regular. Priority SUs are polled much more frequently than regular SUs.
Priority SUs in general will respond to the AP with less latency than regular SUs.
Group: SU to SU Group # (1..F in hex) for SU to SU communications within the same sector. Note:
This SU to SU feature allows interconnectivity between multiple SU’s in the same sector,
without the need for a router. Only SUs with the same SU to SU group # may communicate
with each another. If you do not want the SUs to communicate with each other, choose N/A
for SU to SU group. In order to use SU to SU communication, AP switch #3 must be ON.
The default setting for switch #3 is OFF.
CIR UP: Committed Information Rate from SU to AP. Minimum upstream data rate (measured in
Kbps) at which the SU will attempt to deliver bandwidth to the AP. Maximum setting is
3000.

Basic Configuration via Browser Interface
Trango Broadband Wireless — User Manual M915S Rev. 1 Page 11
CIR DOWN: Committed Information Rate from AP to SU. Minimum downstream data rate (measured in
Kbps) at which the AP will attempt to deliver bandwidth to this SU. Maximum setting is
3000.
MIR UP: Maximum Information Rate from SU to AP. Maximum upstream data rate (measured in
Kbps) at which the SU will attempt to deliver bandwidth to the AP. Maximum setting is
3000.
MIR UP: Maximum Information Rate from AP to SU. Maximum data rate (measured in Kbps) at
which the AP will attempt to deliver bandwidth to this SU. Maximum setting is 3000.
DEVICE ID: MAC address of the SU.
Creating an SU in the SU Database.
1. Connect to the AP (see Getting Started) and open the Subscriber Database page.
2. Enter SU ID (range 1 – 126).
3. Select either PRIORITY or REGULAR.
4. If SU will be part of an SU to SU group, enter the SU to SU group number.
5. CIR up: (SU to AP Committed Information Rate) – minimum upstream bandwidth for the SU in Kbps.

Basic Configuration via Browser Interface
Trango Broadband Wireless — User Manual M915S Rev. 1 Page 12
6. CIR dn: (AP to SU Committed Information Rate) – minimum downstream bandwidth for the SU in Kbps.
7. MIR up: (SU to AP Maximum Information Rate) – maximum upstream bandwidth for the SU in Kbps.
8. MIR dn: (AP to SU Maximum Information Rate) – maximum downstream bandwidth for the SU in Kbps.
9. Enter Device ID (MAC Address of the SU).
10. Save and Activate changes.
!
Important! Always remember to Save and Activate changes, or the SUDB will revert back to its previous
state after a power cycle or reboot.
!
Important! SUs using SU to SU communication must be on the same subnet.
Configure Other Basic AP Parameters
In addition to setting up the SU in the SUDB, the following settings in the AP’s Configuration page must be set (or
left at default).
Base ID: Four character, alphanumeric, user definable base station ID. Input of BASEID shall be in the
format of xxxx. Where x is any character from the set: {0..9; a..z; A..Z; '!@#$%^&*()_+[]\<>,./?'}.
The Base ID is typically assigned to a single AP or a group of APs at a particular cell site. The
Base ID in the AP must match the Base ID in the SU in order for a link to be established. This
parameter can only be changed while in Opmode "OFF."
AP ID: User definable AP ID (00-FF). Default is last two digits of MAC ID. One authenticated, the AP
will automatically assign its AP ID to the SU. This parameter can only be changed while opmode
is “OFF”.
IP Address, Subnet Mask, Gateway:
The IP configuration of the radio. Used for configuration and network management purposes.
Since this is a layer-II device, these parameters do not play a role in the establishment of the
wireless link.
Default Opmode:
Operation mode of the radio after a power cycle or reboot. When the radio enters Opmode "ON," it
will be transmitting. When the radio enters Opmode "OFF," the radio will not be transmitting, but
can be accessed through the Ethernet port. The radio can be put into Opmode "OFF" regardless of
its default Opmode by telnetting into the radio within the first 30 seconds after a power cycle or
reboot.
Active Channel/Polarization:
The current channel and antenna polarization of the unit when in Opmode "ON."
To configure the AP’s other basic settings, complete the following steps:
1. Connect to the AP (see Getting Started) and open the Configuration page.

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2. Set Base ID, or choose the default Base ID of 0000. (Must match the SU.)
3. Set AP ID (00-FF HEX), or choose the default, which is last two bytes of MAC Address.
4. Set IP, Subnet, and Gateway, or leave at default settings. Keep in mind, if you change the IP Settings of
the radio, you will loose your HTTP session when you Save and Activate Settings.
5. Choose Active Channel (1-4).
6. Choose Antenna Polarization (H or V), or choose E for an external antenna. Only use E for M915S-SU-
EXT model.
7. Ensure default Opmode is "ON."
8. Save and Activate Settings.
9. If this is the first SU to be added to the SUDB, reboot the AP.
After reboot, the AP will automatically enter its default Opmode (ON) after approximately 40 seconds. At this time
it will begin actively searching for all SUs in its SUDB. Once an active SU is detected, the authentication and
association process will begin.

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Configure Basic SU Parameters
In order to establish a working link, the Base ID in the SU must match the Base ID set in the AP.
SU Basic Setup:
1. Connect to the SU (see Getting Started) and open the Configuration page.
2. Set Base ID. (Must match the AP.)
3. Set IP, Subnet, and Gateway, or leave at default settings. Keep in mind, if you change the IP Settings of
the radio, you will loose your HTTP session when you Save and Activate Settings.
4. Ensure default Opmode is "ON."
5. Save and Activate Settings.
6. If in Opmode “OFF,” click Activate Opmode.
At this point, if all parameters have been set correctly and the radios are within range, a wireless link between the
AP and SU will automatically become established. Once this occurs the SU will be in “associated” status.
Allow approximately 60 seconds for the radios to complete the boot-up cycle and to associate. If the
AP is busy servicing many SUs, the association process may take slightly longer.

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LED Summary
At this point it is useful to learn about the LEDs that can be found on the bottom of the radio. These LEDs can
assist the user in determining radio and link status.
ASSOCIATION LED (GREEN)
Blinking once every second in
Opmode "OFF" (AP and SU).
Twice per second Opmode "ON" and
scanning for an AP (SU Only).
Solid after unit is associated with an
AP (SU Only).
Solid after unit is in Opmode "ON" (AP
Only).
ACT LED (RED) - Ethernet Activity Light
10/100 Link LED (GREEN) -
Illuminated when link speed is
negotiated at 100 BaseT. It is off
when link speed is 10 BaseT or not
connected.
RSSI LEDs (YELLOW) - In all modes except "Survey,"
the unit's four yellow LEDs indicate the level of RF
signal being received from a valid AP.
Yellow LED 1 (rightmost): On when RSSI > -85 dBm
Yellow LED 2 : On when RSSI > -75 dBm
Yellow LED 3 : On when RSSI > -65 dBm
Yellow LED 4 (leftmmost): On when RSSI > -55 dBm.
In addition, these 4 LEDs will flash once to indicate the
'factory reset' button has been activated.
RESET BUTTON - resets IP and
password to factory default
Figure 7: LED Summary
Figure 8: LED and Reset Button Window
LED / RESET BUTTON WINDOW

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Link Control Page
The radio’s firmware includes several useful tools to assist in determining which SUs are associated and the quality
of each link. One method for verifying link quality is by using the Link Control page.
On this page the user can immediately see which SUs have associated. In the page shown, SU ID# 1 is associated,
and SU ID 17 is not. Consider "Power Off" status synonymous with "not associated."
RF Link
Loopback Test
The RF Link Loopback test
is one of the built-in tools
for evaluating the quality
of the wireless link.
Specify an SU ID and time
in minutes to conduct the
test. The test is prioritized,
so it will take precedence
over all other traffic. 1600
byte packets are sent and
received between the SU
and AP at 50 millisecond
intervals over the time
specified.