V.92 is the new dial-up modem
specification from the ITU (International Telecommunications Union) that
introduces three new features that will add convenience and performance
for the modem user. The three features are quick connect, Modem-on-Hold™
(MOH) and PCM Upstream.
What is the
The International Telecommunications Union (ITU)
is a formal, worldwide telecommunications standards body. The ITU is
a charter organization of the United Nations (UN), and is based in Geneva,
What makes a V.92 modem faster than V.90 modem?
The quick connect feature of a V.92 modem cuts the
modem negotiation or handshake time by up to 50% so you can dial-in
faster. The main feature that makes a V.92 modem faster than a V.90
modem is V.44 the new compression protocol. It is based upon a compression
scheme that can speed up your web browsing as much as 50%. Not all V.92
modems are required to have V.44 data compression.
Why do I need or want V.92?
Although broadband technologies (DSL and Cable) are
all the rage right now, in reality, most people around the world only
have access to analog phone lines. Dial-up modems will remain the primary
means to get on the Internet for several years, so it is important to
improve the user experience on this technology.
How do V.92 modem speeds compare to ISDN, ADSL
and Cable speeds?
The V.92 modem is a regular dial-up modem with increased
speed. ISDN (64-128Kbps), ADSL (640Kbps and up), Cable (1000Kbps and
up) and other broadband connections have a higher "raw power"
connection speed so they will continue to be faster than a V.92 modem.
What will quick connect do for me?
Very simply, quick connect will shorten the time
it takes to make a connection by remembering ("training")
the phone line characteristics and storing them for later usage. Typically,
the modem handshake (all that noise you hear) takes from 25 to 27 seconds.
Surveys indicate that people are quite irritated at this length of time.
Quick connect will cut the modem handshake time in half for most calls,
a significant improvement.
Will quick connect work for me while I'm on the
road with my laptop?
Yes. Since quick connect actually "trains"
the modem on the first call, all the following calls will be quick connects
- faster handshake times. People usually make more than one connection
from the same phone line (e.g. hotel) when they are traveling.
What will PCM Upstream do for me?
PCM Upstream boosts the upstream data rates between
the user and ISP to reduce upload times for large files and email attachments.
A maximum of 48 Kbps upstream rates is supported. PCM Upstream will
work particularly well with new equipment such as Internet-connected
digital cameras, which primarily upload rather than download information.
Will I be able to upgrade my V.90 modem or will
I have to buy a new V.92 modem?
Some of the older V.90 modems that were upgraded
from x2 or K56Flex to V.90 do not have the hardware needed to implement
V.92. In those cases, you would have to buy a new modem to get V.92
capabilities. All other modems should be V.92 upgradeable.
What will MOH do for me?
Many households use the same phone line for both
voice calls and data (Internet), so when the user is browsing the Internet,
an incoming call cannot get through. MOH allows you to receive an incoming
call and stay connected to the Internet (Call-Waiting service from your
phone company is all that is required). It also works in reverse; you
can initiate a voice call while connected and keep the modem connection.
How much time will I have if I choose to take
an incoming call?
Your ISP defines the “hold” time. The
V.92 specification allows for hold times to be anywhere from 10 seconds
Do I have to redial to get back to the Internet?
No. When you hang up the phone you can resume browsing.
Can I stay on the Internet and make a phone call?
Yes. Initiating calls is easy with MOH. First, a
MOH application is executed. This program suspends the data connection
between your modem and the ISP so you can pick up your phone and make
an outgoing call in the usual way. The application puts the modem "on-hold",
flashes the hook, and a dial tone appears on the extension handset so
you can make a call. When your call is complete, the modem will detect
an extension on hook, flash the hook twice, and return to the data (Internet)
How long will I have before the Internet connection
Again, your ISP determines the hold time. For example,
the MOH application can display the time allotted and also display a
countdown so you will know how much time you have left for the phone
There are different types of CallerID available
from the telephone companies. What services do I need to use MOH?
For the purposes of this document, we will use Telco terms that are
used in the United States. These services may be called by a different
name in other countries.
First and foremost, you must have Call Waiting in order to take advantage
of MOH. CallerID (CID) is not required. There are 2 types of CID, type
1 and type 2.
Type 1 CID is a service that allows a telephone subscriber to receive
information on the incoming call BEFORE the user (or modem) takes
the call by going off-hook. Sometimes called on-hook CID, it does
not require Call Waiting, but it does require hardware support on
the modem board if you want to use this feature via the modem. This
is because without specific hardware support, there is no data path
from the telephone line to our modem device when the modem is in the
Type 2 CID (also referred to as CID on Call Waiting) does not require
hardware support on the modem board. Type 2 CID is not required for
MOH to work. However without type 2 CID support from the Telco, the
user will not be able to receive details (telephone number) of the
incoming third-party call. For the purposes of a MOH discussion, we
will only refer to Type 2 CID.
In summary, for MOH functionality, the user must have Call Waiting
service from their telephone company at a minimum. Optionally, for CID
on CW, the user must have CID on Call Waiting (not just CID) service
from the Telco.
Which international Telcos support Call Waiting?
Most international telcos support Call Waiting, however
it is up to the modem to support the various CW tones in the driver.
Please check with your modem manufacturer.
Which countries support Call Waiting CID?
Not every international Telco offers CID on Call
Waiting as a commercial package, even if it is supported in the Telco
equipment. First, check with your telephone company to see if Call Waiting
CID is offered as a service. Second, check with your modem manufacturer
for a list of countries supported.
Where can I get a MOH software application?
We expect that most modem manufacturers will supply
a Modem-on-Hold applet with the modem driver. Check with your modem
manufacturer for details.
What is V.44?
A new link-layer compression standard based on technology
developed by Hughes Network Systems, V.44 will replace the current V.42bis
compression technology. V.44 offers a higher compression ratio than
What will V.44 do for me?
Higher compression ratios mean that more data can
be downloaded in the same amount of time. The most significant improvement
will be noticed when you are browsing and searching the web, since HTML
text files are highly compressible. For most users, data throughput
will be increased by 20 to 60%.
Is this the last standard development for analog
New features are proposed to the ITU every year,
so it is not out of the realm of possibility that we will see new developments
for the analog modem in the next year.
What is NetWaiting™?
NetWaiting (a BVRP application) is bundled with the
Conexant V.92 modem chipset and driver. In NetWaiting's initial release,
Call Waiting is supported for the US, Japan, China, Israel, France,
Italy and Singapore. Call Waiting CID is supported for US, Japan, Israel,
France and Italy. More countries will be added over time.
NetWaiting, like all MOH applications requires
the user to have Call Waiting service with their telephone company.
Additionally, Call Waiting must be enabled. Some ISPs (e.g. AOL) automatically
turn off Call Waiting in their dial up scripts.
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