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User Manual
36
3.5 Troubleshooting
The following table describes solutions to the common problems.
You can also use the auto installation CD-ROM to solve certain connection problems.
If the solutions provided in this document cannot solve the problems you meet, contact
the customer service center of Vodafone.
Phenomenon
Possible Cause
Solution
The power indicator is off.
The HG556a is not connected
to the power supply.
Connect the HG556a to
the power supply.
The ADSL indicator is off.
The telephone line is not
properly connected.
Check the connection of
the telephone line.
The Ethernet cable is not
connected to the Ethernet
interface on the HG556a.
Connect the Ethernet
cable to the Ethernet
interface on the HG556a.
The LAN indicator is off.
The Ethernet cable is not
connected to the PC.
Connect the Ethernet
cable to the PC.
The Wi-Fi indicator is off.
The Wi-Fi radio channel of
the HG556a is off.
Check whether the Wi-Fi
button on the side panel
of the HG556a is pressed.
The TCP/IP protocol of the
network connection
(Ethernet or USB) is not
installed.
Install the Ethernet cable
or USB data card.
The browser has set up a
proxy server.
Access the option of the
Internet Explorer and
disable the proxy server.
The SSID or encryption
mode
(WPA/WEP/non-encryption)
of the HG556a is modified or
the configuration of the Wi-Fi
device is incorrect.
Check whether the SSID
or encryption mode of the
HG556a is correct.
The Wi-Fi device is out of the
radio coverage of the
HG556a.
Put the Wi-Fi device
within the radio coverage
of the HG556a.
Unable to access the
Internet.
The Wi-Fi device is not
authorized.
Use the 802.11b or
802.11g authorized
device and check
whether the installation
and configuration are
correct.
The HSPA indicator is off.
The HSPA module is not
correctly connected.
Reconnect the HSPA
module.
The HSPA indicator
blinking quickly.
The HG556a fails the HSPA
self-test.
Check whether the input
PIN is correct or check
whether the SIM card is
inserted correctly or
restart the HG556a.
Page 37 / 42
User Manual
37
3.6 Safety Precautions
3.6.1 RF Exposure
The device contains a transmitter and a receiver. When it is on, it receives and transmits
RF energy. When you communicate with your device, the system handling the connection
controls the power level at which your device transmits. Huawei declares that the device
is in compliance with EN50385.
Body Worn Operation
Important safety information regarding radio frequency (RF) radiation exposure
Failure to observe these instructions could lead to higher RF exposure than the specified
limit.
Regulatory Information
The following approvals and notices apply in specific regions as noted.
CE Approval (European Union)
The device is approved to be used in the member states of the EU. Huawei declares that
the device complies with the essential requirements and other relevant provisions of the
Radio and Telecommunications Terminal Equipment Directive 1999/5/EC (R&TTE
Directive).
3.6.2 Product Handling
You are responsible for how you use your device and the related consequences.
You must always switch off the device wherever the use of a wireless device is prohibited.
Use of your device is subject to safety measures designed to protect users and their
environment.
z
Before you install and use the device, read these safety precautions carefully and
observe them during operation.
z
Handle the device and accessories carefully and keep it in a clean and dust-free place.
z
Place the device at a well-ventilated and dry place.
z
Keep the device away from equipment with strong magnetic field or electromagnetic
field, such as a microwave oven, a refrigerator, or a mobile phone.
z
Do not expose the device or its accessories to open flames or lit tobacco products.
z
Do not expose the device or its accessories to liquid, moisture, or high humidity.
z
Do not drop, throw, or try to bend the device or its accessories.
z
Do not use harsh chemicals, cleaning solvents, or aerosols to clean the device or its
accessories.
z
Do not paint the device or its accessories.
z
Do not attempt to disassemble the device or its accessories. Only the authorized
personnel have the authority to disassemble the device.
z
Do not expose the device or its accessories to extreme temperatures, minimum 0 and
maximum 40 degrees Celsius.
z
Abide by the local regulations when disposing the electronic products.
Page 38 / 42
User Manual
38
Safety Precautions for Children
Do not let children play with the device and its accessories. Otherwise, they may get hurt
or may accidentally damage the device.
The device contains small parts with sharp edges that may cause an injury.
Device Heating
Your device may get heated during charging and normal use.
WEEE Approval
The device is approved to be used in the member states of the EU. Huawei declares that
the device complies with the essential requirements and other relevant provisions of the
Waste Electrical and Electronic Equipment Directive 2002/96/EC (WEEE Directive).
3.6.3 Electrical Safety
Accessories
Use accessories that are approved.
Do not connect the device with incompatible products or accessories.
Faulty and Damaged Products
Do not attempt to disassemble the device or its accessories.
Only qualified personnel can service or repair the device or its accessories.
If the device or its accessories are damp, punctured, or subjected to a severe fall, do not
use it until you get an approval from the authorized service center.
3.6.4 Interference
Be careful when using the device in close proximity to personal medical devices, such as
pacemakers and hearing aids.
Pacemakers
Pacemaker manufacturers recommend that a minimum separation of 15 cm be
maintained between a device and a pacemaker to avoid potential interference with the
pacemaker.
Medical Devices
Please consult your doctor and the device manufacturer to determine if the operation of
the device may interfere with the operation of your medical device.
3.6.5 Explosive Environments
Blasting Areas
Turn off your device or wireless device in areas prone to explosions or in areas posted turn
off "two-way radios" or "electronic devices" to avoid interfering with the explosions.
Lightning
Turn off your device and disconnect it from your computer during lightning weather.
Page 39 / 42
User Manual
39
3.7 Glossary
ADSL
Asymmetric Digital Subscriber Line
ADSL is a technology for transmitting digital information at a high bandwidth on existing
phone lines to homes and businesses. Unlike regular dial-up phone service, ADSL
provides continuously-available, "always on" connection. ADSL is asymmetric in that it
uses most of the channel to transmit downstream to the user and only a small part to
receive information from the user. ADSL simultaneously accommodates analog (voice)
information on the same line. ADSL is generally offered at downstream data rates from
512 kbit/s to about 6 Mbit/s.
ADSL2+
Asymmetric Digital Subscriber Line 2+
ADSL2plus doubles the bandwidth used for downstream data transmission, effectively
doubling the maximum downstream data rates, and achieving rates of 20 Mbit/s on phone
lines as long at 5,000 feet. ADSL2plus solutions will most commonly be multimode,
interoperating with ADSL and ADSL2, as well as with ADSL2plus chipsets.
Browser
A computer program that allows users to view information from the Internet. To use a
browser, you type in the URL of a website, and the browser then connects your computer
to the website, and shows the information there on your screen.
Client
On a local area network or the Internet, a computer that accesses shared network
resources provided by another computer (called a server).
DHCP
Dynamic Host Configuration Protocol
DHCP is a client-server networking protocol. Most organizations use DHCP. A DHCP server
provides configuration parameters specific to the DHCP client host requesting, generally,
information required by the host to participate on the Internet network. DHCP also
provides a mechanism for allocation of IP addresses to hosts.
DNS
Domain Name System
A hierarchical way of tracking domain names and their addresses, devised in the
mid-1980s. The DNS database does not rely on one file or even one server, but rather is
distributed over several key computers across the Internet to prevent catastrophic failure
if one or a few computers go down. DNS is a TCP/IP service that belongs to the Application
layer of the OSI model.
Ethernet
A local area network (LAN) architecture developed by Xerox Corporation in cooperation
with DEC and Intel in 1976. Ethernet uses a bus or star topology and supports data
Page 40 / 42
User Manual
40
transfer rates of 10 Mbit/s. The Ethernet specification served as the basis for the IEEE
802.3 standard, which specifies the physical and lower software layers. Ethernet uses the
CSMA/CD access method to handle simultaneous demands. It is one of the most widely
implemented LAN standards.
IEEE
Institute of Electrical and Electronics Engineers (IEEE) is a standards organization for
computer and electronic devices. Its senior members are IEEE fellows.
Internet
Largest global internet work, connecting tens of thousands of networks worldwide and
having a "culture" that focuses on research and standardization based on real-life use.
Many leading-edge network technologies come from the Internet community.
The most important using for Internet is:
z
The email
z
The World Wide Web (WWW)
z
The transfer of data
z
The forum of discussion
z
To transfer data of peer-to-peer
z
Chat
z
The content of audio/video streaming
IP
Internet Protocol
The set of standards responsible for ensuring that data packets transmitted over the
Internet are routed to their intended destinations.
IP address
An IP address is the logical address of a network adapter. The IP address uniquely
identifies computers on a network. An IP address can be private, for use on a LAN, or
public, for use on the Internet or other WAN.
kbit/s
Kilobit per second
A unit used to express the speed of a network.
LAN
Local Area Network
A computer network covering a small local area, like a home, office, or small group of
buildings such as a home, office, or college. Current LANs are most likely to be based on
switched Ethernet or Wi-Fi technology running at 10, 100 or 1,000 Mbit/s (1,000 Mbit/s is
also known as 1 Gbit/s).
MAC address
It is a hardware address that uniquely identifies each node of a network.

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