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All ITSC modem pools can support the V.90 standard.
You can enjoy a high speed connection if your
modem also supports the V.90 standard. Since
the FCC regulations prohibit modem transmissions
exceeding 53.3kbps, the download throughput
would be between 40k-53k bits per second depending
on the telephone line quality.
- What is V.90?
- How many 56K modem technologies
available in the market?
- Are all the 56K modem
technologies compatible with each other?
- I want to buy a new modem.
Anything should I note?
- Which 56K technology
is ITSC modem pools currently supporting?
- Which V.90 modems have
been tested for not having connection problem?
- Why can't I connect at
56kbps? I already got a dual 56k standard
modem!
- I still encounter problems
in connecting at 56K. Any ideas?
- Are there any websites
for 56K information?
1.
What
is V.90?
The
V.90 is an open standard for 56k modem. This
standard is endorsed by the International Telecommunications
Union (ITU) and is expected to replace the current
proprietary standards such as 3Com's X2 and
Rockwell/Lucent K56flex in future.
2. How
many 56K modem technologies available in the
market?
There
are 3 different modem technologies supporting
56K in the market:
- V.90
from ITU
- X2
from US Robotics
- K56Flex
from Rockwell and Lucent Technologies.
3. Are
all the 56K modem technologies compatible with
each other?
No.
They are mutually incompatible. This means that,
if you made connection with your 56k modem to
a modem pool using another type of 56k technology,
the maximum speed should be 33.6Kb or lower.
4. I
want to buy a new modem. Anything should I
note?
To
save your investment, you are recommended to
buy a dual 56k standard modem, such as
V.90/X2 and V.90/K56flex. When all ISPs upgrade
their modems to support V.90, you do not need
to purchase another modem.
5.
Which
56K technology is ITSC modem pools currently
supporting?
- Two
distinct modem pools at ITSC, X2 56k (29330633,29330733)
and K56flex (29330800,29330900,29328000).
- Both
X2 modem pools (29330633 and 29330733) and
K56flex modem pools (29328000, 29330900 and
29330800) support ITU V.90 56k standard.
6.
Which
V.90 modems have been tested for not having
connection problem?
Below is a list of V.90 modems which are tested
by both Cisco and 3Com/USR. If users are using
USR, 3Com Megahertz, ZOOM and Hayes, they should
not have any connection problem.
| Modem |
3Com(USR) |
Cisco
5200 |
Cisco
5300 |
| USR
COURIER V.90 7.3.14 |
OK |
OK |
OK |
| USR
SPORT V.90 4.6.6 |
OK |
OK |
OK |
| USR
SPORT V.90 4.7.31 |
OK |
OK |
OK |
| USR
SPORT V.90 4.9.1 |
OK |
OK |
OK |
| 3Com
Megahertz |
OK |
OK |
OK |
| ZOOM
V.90 2.057 |
OK |
OK |
OK |
| ZOOM
V.90 2.081 (2M) |
OK |
OK |
OK |
| Hayes
Accura V.90 (Lucent chipset) |
OK |
OK |
OK |
| Hayes
Optima V.90 (Lucent chipset) |
OK |
OK |
OK |
7.
Why
can't I connect at 56kbps? I already got a
dual
56k standard modem!
You
will not get 56kbps in reality because FCC at
USA imposes a regulation on the modem speed
up to 53k only. However, you can usually make
connection at a speed ranging from 40k - 53k
per second.
The
theoretical connection speed at 56000bps can
hardly be achieved due to a number of factors,
such as the quality of your phone line and the
line conditions.
It
is expected that V.90 modems will not be stable
till the first quarter of 1999. You can try
the latest version to improve the performance.
For details, please visit http://www.nwc.com/921/921r2.html
8.
I
still encounter problems in connecting at 56K.
Any ideas?
When
encountering a connection problem, you can upgrade
the modem code to the latest version . If the
problem is till there, please try to fix the
connection method to K56flex/X.2 or downgrade
to the previous version which does not support
V.90. Or, fix it to V.34.
9. Are
there any websites for 56K information?
Yes,
the following websites provide more information
about 56k modems in the market:
|
Campus-wide E-mail (CWEM)
