Digi SR44-E User manual

T Tr ra an ns sp po or rt t S SR R
Cellular Routers
Wireless WAN
router / switch
Installation Guide

Disclaimer
Digi International makes no representations or warranties with respect to the contents or
use of this manual, any software drivers or associated application software provided with
this product and specifically disclaims any expressed or implied warranties of
merchantability or fitness for any particular purpose.
Digi International reserves the right to modify or revise all or part of this document, its
contents, and any products described herein at any time without prior notification and
shall not be responsible for any loss, cost, or damage, including consequential damage,
caused by reliance on these materials.
Product disposal instructions
The WEEE (Waste Electrical and Electronic Equipment: 2002/96/EC) directive has been
introduced to ensure that electrical/electronic products are recycled using the best
available recovery techniques to minimize the impact on the environment.
This product contains high quality materials and components which can be recycled. At
the end of its life this product MUST NOT be mixed with other commercial waste for
disposal. Check with the terms and conditions of your supplier for disposal information.
Copyright
© 2009 Digi International. All rights reserved. No part of this document covered by
copyright may be reproduced or copied in any form or by any means graphic, electronic,
or mechanical, including photocopying, recording, taping, or information and retrieval
systems without written permission of Digi International.

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Safety Notices
1) Please read all instructions before installing and powering the unit. You should keep
these instructions in a safe place for future reference.
2) The Transport SR family uses a 12V DC/1.5A power supply. If the power supply
shows signs of damage or malfunction, you should stop using it immediately - turn off
the power at the mains and disconnect it from the power supply before contacting
your supplier for a repair or replacement.
3) Changes or modifications not expressly approved by the party responsible for
compliance could void the user‟s authority to operate the equipment. Use only the
accessories, attachments, and power supplies provided by the manufacturer –
connecting non-approved antennas or power supplies may damage the unit, cause
interference or create an electric shock hazard, and will void your warranty.
4) Do not attempt to repair the products; they contain no electronic components that can
be serviced or replaced by the user. Any attempt to service or repair the unit by the
user will void the product warranty.
5) The Transport SR is designed for indoor use only and should be used in an
environment that is suitable for computers and other electronic equipment.
6) Ports that are capable of connecting to other apparatus are defined as SELV ports.
To ensure conformity with IEC60950 ensure that these ports are only connected to
ports of the same type on other apparatus.
Wireless Networks
The Transport SR series routers support both GSM and CDMA networks. GSM networks
support the GPRS, EDGE, UMTS, HSDPA and HSUPA data transmission standards.
CDMA networks support the IXRTT and EVDO data transmission standards. Throughout
this manual these networks will be referred to as either GSM, CDMA, or simply „wireless‟
networks.
The type of network supported by each model is summarized in the table below:
Network
Model
GSM
GPRS
GSM
EDGE
WCDMA
UMTS
WCDMA
HSDPA
WCDMA
HSUPA
CDMA
EVDO1xRTT
SR44-E
SR44-H
SR44-U
SR44-C

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Special Notes on Wireless Safety
Digi International products are designed to the highest standards of safety and
international standards compliance for the markets in which they are sold. However,
wireless based products contain radio devices which require specific consideration.
Please take the time to read and understand the following guidance. Digi International
assumes no liability for an end user‟s failure to comply with these precautions.
Wireless routers incorporate a wireless radio module. Users should
ensure that the antenna is positioned at least 1 metre away from
themselves and other persons in normal operation.
When in a hospital or other health care facility, observe the restrictions on
the use of mobile phones. Do not use the router in areas where
guidelines posted in sensitive areas instruct users to switch off mobile
phones. Medical equipment may be sensitive to RF energy.
The operation of cardiac pacemakers, other implanted medical
equipment and hearing aids can be affected by interference from cellular
terminals such as the wireless routers when placed close to the device. If
in doubt about potential danger, contact the physician or the
manufacturer of the device to verify that the equipment is properly
shielded. Pacemaker patients are advised to keep the wireless router
away from the pacemaker while it is on.
Wireless routers must NOT be operated on aircraft. The operation of
wireless appliances in an aircraft is forbidden to prevent interference with
communications systems. Failure to observe these instructions may lead
to the suspension or denial of cellular services to the offender, legal
action, or both.
As with any electrical equipment, you should not operate your wireless
router in the presence of flammable gases, fumes or potentially explosive
atmospheres. Radio devices should not be used anywhere that blasting
operations are taking place.
Wireless routers receive and transmit radio frequency energy while
switched on. Remember that interference can occur if it is used close to
TV sets, radios, computers or inadequately shielded equipment. Follow
any special regulations and always switch off your wireless router
wherever forbidden or when you suspect that it may cause interference
or danger.
SOS IMPORTANT! –Wireless routers operate using radio signals and
cellular networks cannot be guaranteed to connect in all possible
conditions. Therefore, you should never rely solely upon any wireless
device for life critical communications.

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Preface
This guide describes the installation procedure for the Digi Transport SR family. It is
intended to provide sufficient information for you to be able to connect the unit to your
terminal equipment and power supply. A complete reference guide to the software
features that are available on the product is available separately in PDF format, and can
be downloaded from the Digi International website (www.digi.com).
All models feature:
4 x 10/100Base-T Ethernet ports
2 x RS232 sync/async serial ports (25-way D)
2 x USB 2.0 host ports
Several combinations of wireless and PSTN connectivity are available depending on the
model.
Note: You will not be able to use the router for remote communication until you have
subscribed to a suitable wireless network service.
Package Contents
When you receive the router carefully unpack it and check the contents. These should
include:
Item
System unit
12V power supply
Installation guide
2m CAT5 STP LAN cable (blue)
2m PSTN cable (Models with PSTN only)
Cellular antenna (may be sold separately)
If any item is missing or damaged, please contact your supplier. You should also make a
record of any damage that may have occurred during shipping and report it to the carrier.

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1 Introduction
The Transport SR and other models described in this guide are compact IP routers that
facilitate the transmission of data over UMTS, HSDPA, EVDO, GPRS, EDGE and/or
PSTN networks. All models incorporate a 4-port 10/100 Ethernet switch. Depending on
the model, each unit also incorporates one or more WAN interfaces as follows:
SR44-E, H, U –wireless GPRS/EDGE/UMTS/HSDPA/HSUPA only
SR44-C –wireless CDMA/IXRTT/EVDO only
The routers can be configured either by using commands entered at the serial port (much
like a modem), or via the built-in Web interface. We recommend that you use the Web
interface whenever possible.
In addition to many standard LAN and Internet protocols such as PPP, Transport SR
series products provide a combination of powerful but easy to use configuration,
management and diagnostic tools. This makes them simple and cost-effective solutions
for migrating existing terminal or telemetry equipment, which use wired networks (PSTN,
ISDN, etc.), to wireless operation.
1.1 Front Panel Features
The front panel of the unit incorporates the USB host connectors, a number of LED
indicators depending on the model and the two SIM card-holders as shown in the
following illustration (GSM models):
USB Host Connectors
The USB host connectors may be used to connect compatible USB client devices such as
memory sticks, serial adapters, etc.

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Status Indicators
The status indicators operate as follows:
ON
Illuminates steady red when power is applied.
LAN 0, 1, 2, 3
Illuminate steady when there is a network connection to the
associated LAN port and flash when data is transmitted or
received.
W-WAN:
NET, SIM,
DAT
These indicators display the wireless WAN status as follows:
NET –Illuminates green when a wireless network has been
detected.
SIM –Illuminates green when a valid SIM card is installed in the
unit.
DAT –Flashes green when data is being transmitted or received.
SIGNAL
The three indicators labelled SIGNAL illuminate to indicate the
wireless signal strength as follows:
None illuminated < -113 dBm (effectively no signal)
1 LED illuminated >= -112 dBm and <= -87dBm (weak)
2 LED‟s illuminated >= -86dBm and <= -71dBm (medium)
3 LED‟s illuminated >= -70dBm and <= -51dBm (strong)
PSTN:
OH, CD, DAT
On the Transport SR models with a PSTN interface, these
indicators operate as follows:
OH –Illuminates green when the modem has gone off-hook.
CD –Illuminates green when the unit has connected to a remote
modem and asserted the Carrier Detect signal at the serial port.
DAT –flashes green when the unit has connected to a remote
modem and data is being transferred.
SERIAL:
0, 1
These indicators operate in one of two software configurable
modes:
Connection Mode: Illuminate steady if a terminal is connected to
the serial port and the DTR signal is on. Flash when data is
transmitted or received.
DTR Mode: Flash when data is transmitted or received only.

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SIM Card Sockets
The two sockets at the right side of the front panel are for the GSM SIM card(s) that you
will receive from your service providers. Details of how to insert these correctly are given
in section 2 below.
CDMA models do not require SIM cards and therefore do not have SIM card sockets.
Rear Panel Features
(SR44 shown with PSTN option)
The functions of these connectors are described in the following table:
12V DC
This socket is used to connect the unit to the power supply using
the 12V DC power supply provided .
LAN 0, 1, 2, 3
The LAN sockets are used to connect the unit to 10/100-BaseT
LANs using the 2-meter STP (Shielded Twisted Pair) cable
supplied or a suitable alternative. These ports are auto-sensing
for speed and wiring (straight-through or cross-over). To comply
with EMC requirements they should not be used with non-STP
cable.
W-WAN ANT.
(main)
This SMA connector is used to fit the wireless antenna. The
Transport SR-, E and H models are supplied with a single stub
antenna which should be fitted to this connector.
Note: Stub antennas are provided as standard but a range of
suitable alternative for use in different applications may be
purchased separately.
W-WAN ANT.
(aux)
This SMA connector is used on the Transport SR44-U and C
models to fit the second antenna supplied with the unit. The
receiver supports “diversity” antenna capability to improve
performance and are there supplied with two stub antennas. On
models that do not support diversity antennas this connector will
not be present.

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SERIAL 0, 1
These DB 25 sockets provide synchronous/asynchronous RS232
serial ports which may be used to connect the router to
compatible serial devices. To comply with EMC requirements it
should not be used with a cable longer than 2 meters.
PSTN
This socket is used to connect the router to a PSTN line.
Reset Switch
This is located on the underside of the unit near the front. Pressing the switch gently with
the tip of a pen or other suitable implement while the unit is powered will generate a
hardware reset.

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2 Installation
All of the products described in this guide are designed for indoor use (office or home).
The system unit should be positioned on a smooth, level surface making sure that there is
adequate ventilation. Do not expose it to extremes of heat or cold, strong magnetic fields
or liquids.
It is important to remember that these products are wireless devices just like a mobile
phone, so they will only operate reliably over the wireless network if there is a good signal.
For many applications the stub antenna provided will be suitable but in some
circumstances it may be necessary to use a window-mounted or magnetically mounted
antenna with an extended cable to allow the antenna itself to be positioned to provide the
best possible signal reception. Digi International can supply a range of suitable antennas.
Step 1 - Installing the SIM card (GSM models only)
The router incorporates two separate SIM card holders so that if your application
demands it, you may install SIM cards for two different networks. This means that one
wireless service may be used as a back-up service in the event that the primary service
fails in some way. By default, SIM 1 is the default SIM used for access to the primary
network and SIM 2 is used for the back-up network.
Note: SIM 1 and SIM 2 cannot be used to access two networks simultaneously.
The SIM card(s) should be inserted into SIM cardholders at the right side of the front
panel as illustrated below.

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In both cases, the end of the SIM card with the chamfered corner should be inserted first.
For SIM 1 the contacts should be face down. For SIM 2 the contacts should be face up.
Step 2 –Fitting the antenna
The router may be supplied with an antenna for use with wireless networks.
Attach the antenna onto the SMA connector on the rear panel of the router. DO NOT
OVERTIGHTEN THE ANTENNA –IT SHOULD BE FINGER TIGHT ONLY.
Step 3 –Connecting the LAN cable
Plug one end of one of the supplied 2 metre CAT5 cable into the RJ45 socket labelled
LAN 0. Plug the other end into the LAN socket on your PC or notebook.
Step 4 –Connecting the serial cable
For connection to a serial terminal device, connect a DB25 serial cable to the SERIAL
connector on the rear of the unit. Connect the other end of the DB9 cable to the terminal.
Step 5 –Connecting the power supply
Plug the jack plug on the power supply into the socket labelled 12V DC. When power is
first applied, the ON indicator will illuminate and the unit will initiate a series of diagnostic
self-tests. During this process one or more of the other indicators, will flash to show that
the unit is busy. When the flashing stops, the unit is ready to use.
The unit is now ready to be configured.

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3 - Configuration
Once the router has been installed and powered up, the mobile interface needs to be
configured to communicate to the Internet or Wireless WAN provided by your wireless
carrier.
Note: The default IP address for the LAN 0 port is 192.168.1.1, with subnet of
255.255.255.0. DHCP Server is enabled by default on the device, so make sure your host
computer is setup to obtain IP addresses automatically.
Alternatively, setting your PC’s IP address to one on the same subnet (192.168.1.*) will
enable you to connect to the unit’s Web interface.
Step 1 –Connect to the Web Interface
Open a browser and connect to the Web interface by connecting to http://192.168.1.1
It is recommended to change the default username and password on the device.
Default Username: username
Default Password: password
This setting can be changed by going to:
Configuration -> Security -> Users -> User 0-9 -> User 1
Step 2 –Configuration Mobile Interface
The method used to activate the device on a cellular network varies depending on
whether the device is a GSM or CDMA device.
Transport SR44-E, H, U –GSM Devices
Configure the APN by going to:
Configuration -> Interfaces -> Mobile -> W-WAN Module -> SIM 1
Enter the APN of your mobile operator and SIM PIN if you have one. Click OK.

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If the APN you are using does not require a PPP username and password, they you can
skip this next step.
Configuration -> Interfaces -> PPP -> PPP 0-4 -> PPP 1 -> Standard
Enter the PPP username, password, and confirm password. Click OK.
Follow prompts to save the configuration to flash memory.
Transport SR44-C –CDMA Devices
Start the CDMA Provisioning by going to:
Configuration -> Interfaces -> Mobile -> W-WAN Module -> CDMA
Provisioning
Select the proper carrier and start the provisioning script. Manual provisioning can be
selected if you have been provided with the proper parameter from your carrier (MSN<
MSID, SPC, etc.).
Follow prompts to save the configuration to flash memory.

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Step 3 –Verify Cellular Connection
Verify the mobile connection is established and view the mobile IP address by going to:
Diagnostics -> Status -> PPP -> PPP 0-4 -> PPP 1 -> View
Viewing the Event Log can also be used to view the connection status.
Diagnostics -> Event Log
Step 4 –Test Mobile Connection
Depending on the wireless plan being used, you should be able to perform a test to a
remote host or browse the Internet. By default, the Digi Transport should have issued your
workstation an IP address of 192.168.1.100 via DHCP. DHCP will pass the proper default
gateway and DNS server information. Verify this on the workstation by using the “ipconfig”
command. If the workstation does not obtain an IP address of 192.168.1.100 enter
“ipconfig /renew” in your workstation‟s command window.
A simple test for most Internet connected plans is to open a browser and connect to a
web site. For non-Internet connected plans consult your IT administrator and/or wireless
carrier for a recommended host to test against. For example you may be able to ping a
host or router within the carrier‟s network or on the corporate network to verify
connectivity.

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Step 5–Finish Device Configuration
For greater description on all the features and settings available on the device, there is a
comprehensive Reference Guide available on the Digi Support website (www.digi.com).
Advanced Configuration:
VPN: Configuration > VPN
Routing: Configuration >Routing
Firewall: Configuration > Security >Firewall
Users: Configuration > Security > Users
Alarms: Configuration > Alarms
VRRP: Configuration > Interfaces > Eth x > Configure
Ethernet Port Mode: Configuration > Interfaces > Eth x > Configure
Serial Port Mode: Configuration > Serial > ASY Ports

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4 General Specifications
Model numbers
SR44-H,E,U,C
Power supply
12V DC / 1.5A
Dimensions
W187 x D137 x H44 mm
Weight
0.76Kg
Operating temp. range
-20 to +50 degrees Celsius
-4 to +122 degrees Fahrenheit
SR44-H -
WAN interface
Category 12 (QPSK) 2100 MHz HSDPA (max 1.8Mbps
downlink).
Quad-band GSM 850/900/1800/1900 MHz EDGE (E-GPRS)
multi-slot class 10 (max 236.8 kbps downlink), mobile
station class B, modulation and coding scheme MCS1-9.
SR44-E
Quad-band GSM 850/900/1800/1900 MHz EDGE (E-GPRS)
multi-slot class 10 (max 236.8 kbps downlink), mobile
station class B, modulation and coding scheme MCS1-9
GPRS multi-slot class 10, mobile station class B, PBCCH
support, coding schemes CS 1-4
SR44-U
GSM/GPRS/EDGE/
UMTS/HSDPA/HSUPA
modem
HSUPA mode: 2 Mbps Category 5
HSDPA 1.8: Categories 1-4, 11 and 12
HSDPA 3.6: Categories 5 and 6
HSDPA 7.2: Categories 7 and 8
UMTS: 384 Kbps downlink, 384 Kbps uplink
MO 0301: 850/1900/2100 (Rx diversity) MHz
MO 0302: 850 (Rx Diversity) / 1900 (Rx Diversity) / 2100 MHz
Equalization and Rx Diversity at the same time Quad-band
GSM 850/900/1800/1900 MHz EDGE (E-GPRS) multi-slot
class 12 (max 236.8 kbps downlink), mobile station class B,
modulation and coding scheme MCS1-9
GPRS multi-slot class 12, mobile station class B, PBCCH
support, coding schemes CS 1-4

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SR44-C
CDMA 1 x EV-DO
CDMA 1 x ATT
Dual Board 800 MHz Cellular / 1900 MHz PCs
Supports Rx diversity in both 800 MHz and 1900 MHz
1 x EV-DO Revision A (IS-856-A)
Forward link up to 31 Mbps
Reverse link 1.8 Mbps
1 x EV-DO Revision O (IS-85L
Forward link up to 2.4 Mbps
Reverse link 153.6 Kbps
1 x RTT (IS-2000)
Forward and reverse link speeds up to 153.6 Kbps
PSTN interface
14.4 kbps fax modem. V.92 compliant, backwards
compatible with earlier protocols. V.44 data compression,
v.42 LAPM and MNP 2-4 error correction.
USB ports
Three-port USB 2.0 Full-speed Host (OHCI) (12 Mbits per
second maximum throughput)
Ethernet interface
10/100Base-T auto-sensing, auto-MDI/MDX (RJ45)
Serial interface
Sync/Async RS232 compatible via 25-way D socket