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Problem:
My wireless network performance is inconsistent.
Data transfer is sometimes slow.
Signal strength is poor.
I am having difficulty establishing and/or maintaining a Virtual Private
Network (VPN) connection.
Solution:
Wireless technology is radio-based, which means connectivity and the
throughput performance between devices decreases when the distance
between devices increases. Other factors that will cause signal
degradation (metal is generally the worst culprit) are obstructions such as
walls and metal appliances. As a result, the typical indoor range of your
wireless devices will be between 100 to 200 feet. Note also that connection
speed may decrease as you move farther away from the Modem or access
point.
In order to determine if wireless issues are related to range, we suggest
temporarily moving the computer, if possible, five to 10 feet away from the
Modem.
Changing the Wireless Channel
- Depending on local wireless traffic and
interference, switching the wireless channel of your network can improve
performance and reliability. The default channel the Modem is shipped with
is channel 11. You may choose from several other channels depending on
your region (see the section titled “Changing the Wireless Channel” on
page 41 for instructions on how to choose other channels).
Limiting the Wireless Transmit Rate
- Limiting the wireless transmit rate
can help improve the maximum wireless range and connection stability.
Most wireless cards have the ability to limit the transmission rate. To
change this property, go to the Windows Control Panel, open “Network
Connections” and double-click on your wireless card’s connection. In the
“Properties” dialog, select the “Configure” button on the “General” tab
(Windows 98 users will have to select the wireless card in the list box and
then click “Properties”), then choose the “Advanced” tab and select the
rate property. Wireless client cards are usually set to automatically adjust
the wireless transmit rate for you, but doing so can cause periodic
disconnects when the wireless signal is too weak; as a rule, slower
transmission rates are more stable.
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Experiment with different connection rates until you find the best one for
your environment; note that all available transmission rates should be
acceptable for browsing the Internet. For more assistance, see your
wireless card’s user manual.
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Technical Specifications
This chapter provides technical product data for the Modem.
Radio frequency and electrical specifications
Frequency
Range
MV410
Rx: 463 ~ 468 MHz
Tx: 453 ~ 458 MHz
Frequency
Range
MV420 & MV440
Rx: 859.64 ~ 893.37 MHz
Tx: 824.64 ~ 848.37 MHz
Frequency
Range
MV430 & MV440
Rx: 1930 ~ 1989.95 MHz
Tx: 1850 ~ 1909.95 MHz
Channel Bandwidth
CDMA 1.23 MHz
Stability of frequency
0.4 ppm
External appearance (mm)
160 x 178 x 40 mm
Weight
600 g (with battery)
Sending output
maximum 0.23W E.R.P
Temperature of operation
Relative humidity
-20 ~ +60 degrees Celsius
5% ~ 90%
Adapter
Input: AC 110~240V 50~60Hz
Output: DC 12V/2A
Battery
Operation
2.5 Hrs
NMT v1.0
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Appendix A: Glossary
1X
One Times Radio Transmission Technology (the “one times”
refers to the frequency spectrum). Supports Internet connections
with data rates up to 153 Kbps. Actual speed depends on the
network conditions. Compare to 1x EV-DO.
1x-EVDO
A high speed standard for cellular packet data communications
Rev. A supports Internet connections with data rates up to3.1
Mbps (downlink from the network) and 1.8 Mbps (uplink to the
network).
Rev. 0 supports Internet connections with data rates up to 2.4
Mbps (downlink from the network) and 153 Kbps (uplink to the
network).
Average data rates are roughly: for Rev. A: 600–1300 Kbps
(downlink from the network) and 300–400 Kbps (uplink to the
network); for Rev. 0: 400–700 Kbps (downlink from the network)
and 40
80 Kbps (uplink to the network).
Actual speed depends on the network conditions. Compare to
1X.
bps
bits per second—The actual data speed over the transmission
medium.
CDMA
Code Division Multiple Access—A wideband spread spectrum
technique used in digital cellular, personal communications
services, and other wireless networks. Wide channels (1.25 MHz)
are obtained through spread spectrum transmissions, thus
allowing many active users to share the same channel. Each
user is assigned a unique digital code, which differentiates the
individual conversations on the same channel.
CDMA 1X
Also known as 1X, this is a high speed standard for CDMA
cellular communications.
dormant
The packet data connection has the logical PPP session left
open while the underlying physical link (the radio channel) is
released. When traffic is to resume, a radio channel is
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reacquired and the original PPP session resumes.
ESN
Electronic Serial Number—The unique first generation serial
number assigned to the Modem for cellular network use.
Compare to MEID.
FCC
Federal Communications Commission. The U.S. federal agency
that is responsible for interstate and foreign communications.
The FCC regulates commercial and private radio spectrum
management,
sets
rates
for
communications
services,
determines standards for equipment, and controls broadcast
licensing. Consult www.fcc.gov
.
firmware
Software stored in ROM or EEPROM; essential programs that
remain even when the system is turned off. Firmware is easier to
change than hardware but more permanent than software stored
on disk.
host
1. A computer that uses a modem or a similar device to answer a
calling computer.
2. A source or destination in the communication network.
3. A computer that contains data or files to be accessed by client
computers. Also known as a server.
IS
Interim Standard—After receiving industry consensus, the TIA
forwards the standard to ANSI for approval.
IS-95
The standard for CDMA
Kbps
Kilobits per second—Actually 1000, not 1024, as used in
computer memory size measurements of kilobytes.
LAN
Local Area Network
LED
Light Emitting Diode—A semiconductor diode that emits visible
or infrared light.
MEID
Mobile Equipment Identifier—The unique second-generation
serial number assigned to the Modem for cellular network use.
Compare to ESN.
MHz
Mega Hertz—One million cycles per second.
Mbps
Megabits per second

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