Wireless phones have come a long way from the bulky radiophones
of yesteryear that one could hardly call portable. Today's wireless
offerings often weigh less than 7 ounces and can be small enough to
slip into a shirt pocket. These improvements in wireless phone size
and weight are thanks in large part to advances in battery
technology. laptop battery
Let's take a look at the three battery technologies common to
current cell phones. thinkpad
Nickel-Cadmium (NiCad) microsoft
Although newer high-performance phones have rendered it nearly
obsolete, NiCad is still commonly used in many consumer electronics
for its durability and low cost. Among its pros and cons:
laptop computers
- Compatibility. Older phones are more likely to require
NiCad. It generates relatively little heat, and many older phones
cannot withstand the more heat-intensive NiMH or LiON batteries.
laptop computer
- Durability. It charges quickly and handles well under
extreme temperatures.
desktop computer
- Shorter Lifecycle. It provides relatively less power per
charge, so you must recharge it more often. You can usually
recharge it over 700 times before reaching the end of its useful
life.
notebooks
- Memory Effect. If you recharge a NiCad battery before it
has completely discharged (run out of energy), it will "forget"
that it has all of that extra capacity. So it will only partially
recharge, leaving you with a weaker battery.
lenovo
Nickel-Metal Hydride (NiMH)
The next battery generation to follow NiCad, NiMH costs more but
offers several improvements:
hard drive
- Longer Lifecycle. A NiMH battery will last around 25-30%
longer on each charge than a NiCad of similar size. Life
expectancy, in terms of recharge cycles, is comparable to NiCad.
travelstar
- Lightweight. Lighter than NiCad, NiMH batteries can
weigh under 3 ounces.
gateway
- Less Memory Effect. Although still a problem, it occurs
to a much lesser extent than with NiCad. Read "Memory Effect" in
the NiCad section for more details.
laptop parts
- No Toxic Materials. Like everything else, when a battery
reaches the end of its useful life the disposed remains end up back
in the environment. NiMH does not contain the kind of toxic
materials found in some batteries, and is therefore far more
environmentally friendly.
software
Lithium-Ion (LiON)
As the newest battery technology, LiON is both superior to and more
expensive than NiMH. It has some major advantages:
hard drives
- Even Longer Lifecycle. The newest Internet-ready phones
use a lot of muscle and they need a battery that can get the job
done. LiON lasts up to twice as long per charge as NiMH and lasts
approximately 400 charges.
electronics
- Lightest. The latest ultra lightweight phones use LiON
batteries which tend to weigh 30% less than NiMH.
canon
- No Memory Effect. You can recharge it at any time, even
if it has not fully discharged, without losing performance. As a
precaution though, you may want to fully discharge and then
recharge your LiON battery from time to time. When it comes to
precision equipment, better safe than sorry.
desktop pc
- No Toxic Materials. Like NiMH, LiON batteries are
relatively environmentally friendly.
desktop computers
LetsTalk - Digital Phone Technologies: TDMA, CDMA, and GSM
Digital Phone Technologies: TDMA, CDMA, and
GSM
Whenever a new technology is introduced, several different
versions often compete for attention until one comes to dominate
the market. Digital wireless is no different; most service
providers support one of three incompatible technologies for
transmitting and decoding phone calls. Not surprisingly each
technology has its proponents and detractors. Practically speaking,
the most important consideration for consumers is ensuring that
your phone and service provider both "speak the same language." For
instance, you can use a CDMA-compatible phone only on a
CDMA-compatible network. think pad
Let's take a look at the different technologies: repair
TDMA (Time Division Multiple Access) data recovery
TDMA is a time-sharing technology that allows three calls to use a
single frequency at the same time. Since each frequency can juggle
multiple calls at a time, TDMA based digital networks have a call
capacity of around 1, 000, whereas analog networks can handle
around 100 calls at once. Each call is assigned a tiny time slot
during which it has use of the full channel. Calls take turns in a
circular fashion to use the channel. During a call, voice or data
is momentarily stored then sent in bursts when the designated time
slot comes up. A different time slot comes around and the next
user's voice or data is sent through. Since the time slots are very
narrowly "sliced" and the calls are highly synchronized, users
detect no delay whatsoever.
CDMA (Code Division Multiple Access) cisco
CDMA assigns a unique code to each call in the system. Think of
this code like a FedEx tracking number. Your package may be sent
via plane, through several distribution centers, and on numerous
trucks before reaching its final destination, but through the
tracking number, FedEx can tell you where your shipment is at a
given moment. Similarly a CDMA code allows calls to hop from
available frequency to frequency without getting lost and without
interference. Since CDMA calls use whatever bandwidth is available,
this efficiency enables CDMA based digitial networks to carry
between 10-15 times more calls per frequency than with analog, or
around 10, 000 calls total at a time.
GSM (Global Standard for Mobile Communications) keyboard
GSM borrows from both CDMA and TDMA. Like CDMA, GSM encodes calls.
Like TDMA, GSM also separates calls into multiple time slots but in
a way that supports between 8-10 time slots per channel. GSM was
originally developed in Europe where it operates at 900 MHz and
1800 MHz. North American GSM which operates at 1900 MHz is only
used by PCS providers.
monitor
- The bad news. Since European and North American GSM
operate at different frequency bands, you can't use your North
American GSM phone while traveling through Europe.
desktop
- The good news. Most GSM phones use a removable
Subscriber Identity Module (SIM), more commonly known as a smart
card, containing a user's account information, phone book, and
security parameters. By inserting the smart card from your North
American GSM phone into a European GSM phone, you can successfully
roam throughout most of Europe if your provider has roaming
agreements with European carriers. (The reverse is also true for
European users in North America.)
infosys
- The better news. Manufacturers are currently developing
multi-band GSM that, once made available to the public, will allow
GSM phone owners from either side of the Atlantic to roam on both
continents with a single phone (again, as long as your service
provider has roaming agreements with carriers abroad).
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Total Reviews: 7 2.94 The Palm Treo 680 was AWFUL! Rebooted
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November 16th 2007 While other smart phone manufacturers have
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HTC PPC6900
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Total Reviews: 5 3.65 This phone is pretty easy to use. The
touch keyboard isn t all that great to use unless you have
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by Jason HTC is quickly developing a reputation as the maker
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HTC Tilt 8925
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Total Reviews: 22 3.87 Can t get any better than this.
Fast Downloads, Excellent TouchFlo, Fast Video News, Wireless
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Total Reviews: 23 3.92 I love this Samsung SGH-T629!
I ve had a few more dropped calls than with the (other)
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carroll August 13th 2007 Expert Review Expert
Rating 3.0 The Samsung T629 includes many of the features of
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Motorola Q
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1.3 Megapixel camera with flash technology
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Bluetooth (stereo-enabled) mainframe
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Windows Mobile 5 OS samsung
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Total Reviews: 20 3.58 I think the Motorola Q is an
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Samsung SPH-M510
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Total Reviews: 5 3.85 After struggling for a week with the
upstage this phone is a walk in the park. Accessing the various
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Motorola W490
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Total Reviews: 2 4.12 The phone broke in less than a month
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Samsung Juke
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Total Reviews: 1 3.90 The i265 offers a lot for a little
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Blackberry 8703
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I love, love, love it I drop my Blackberry 8703 probably a
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Sony Ericsson K800i
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Total Reviews: 1 4.75 The Sony Ericsson K800i is the
perfect phone for anyone between the ages of 12 through 65.
Though the interface is very complicated, the phone itself has
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Samsung SCH-i760
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High[es Touch#ensitive LCD Display with Backlit QWERTY
Keyboard netvista
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Total Reviews: 1 4.25 I love this phone/pda. I can do just
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LG VX8300
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Total Reviews: 18 4.50 I am thrilled with my LGVX8300. My
husband, daughter, ex-husband and his wife all have them. My
daughter works for Verizon wireless and highly recommended this
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LG CU575
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Samsung SCH-U700
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External touch controls workstation
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zoom iseries
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