Sierra Wireless AirLink Solutions January 2009 4
Using a Sierra Wireless AirLink Raven X or Raven-E with a
Cisco Router
If you have a Raven X or if your computer is equipped with an auto-sensing Ethernet port, you
have the option of using a straight-through Ethernet cable.
• Power supplies and a power source - You will need a power supply and power source for both
the modem and the router.
• PC or Laptop - To configure the modem, you will need a computer with an available Ethernet
port.
Cellular Account Required
• Cellular Account - To use this guide you need to already have an active account with a cellular
provider and to have activated your modem with that provider. Sierra Wireless AirLink
modems are certified to work with a variety of cellular providers.
If you need to activate your modem, you can use the Setup Wizard for your cellular provider
which you can obtain from the AirLink website: http://www.airlink.com.
Important Information about Cellular Networks
• Port blocking - Many cellular providers and other ISPs block ports below 1024 which are com-
monly used for many server protocols, including the SSH server (port 22 by default). If your
provider blocks these ports, you will need to configure ports you can access, if you need remote
access.
• Upload Speed - The 2G and early 3G cellular technologies (CDMA, GPRS, EDGE, iDEN,
and EV-DO Rev0) have a much lower upload (transmit) speed than download. In addition,
many cellular providers also “throttle” the upload speeds of devices connected to their net
-
works. Even with good signal, it is not uncommon to see upload speeds of only 60 to 100kbps
while you have download speeds in excess of 600kbps (2G) or 1000kbps (3G).
• Upload Speed for Cellular “Broadband” using the Raven X - One of the advantages of a
Raven X vs. the Raven-E is the ability to connect at EV-DO Rev A or HSDPA speeds.
EV-DO Rev A is an enhancement to EV-DO Rev 0 and not only improves the download speeds,
3.1Mbps maximum (1Mbps+ typically), but greatly increases the upload speed as well,
1.8Mbps maximum (300-400kbps typically). In areas without EV-DO Rev A coverage, the
Raven X will fallback to EV-DO Rev 0, if it is available, or 1x.
HSDPA is a huge speed increase over EDGE with download speed in excess of 1Mbps maxi-
mum (500-800kbps typically) and upload speed in of nearly 400kbps maximum (200-300kbps
typically). In areas without HSDPA, the Raven X will fallback to UMTS, if it is available,
EDGE, or GPRS.
• Signal Strength and Quality - The upload performance of your modem will also be heavily
influenced by the signal strength and signal quality of the cellular connection in the installed
location. If you do not have optimal signal, the upload speed can be greatly reduced. Sierra
Wireless AirLink Solutions recommends an RSSI of -60 to -80 or better for optimal signal.
However, even with a strong signal, if the modem is connecting to a particular cell site that has
heavy data traffic to share the total available bandwidth to the cellular provider’s network, the
quality of the signal may be lower which can also impact the camera’s remote performance.
These two aspects are also referred to as the coverage and capacity for a specific location. Your
cellular carrier’s representative or your Sierra Wireless representative may be able to help you
determine what is best for your installation.
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