Samsung N640 User Manual download pdf (Page 40)

40 Using the Modem

6. Click OK button to close "Modem Properties" dialog box.

Description of 56K

There are different standards regarding 56K technology.

•

K56Flex.

Technology developed by Rockwell Semiconductor Systems and Lucent

Technologies

•

X2.

Technology developed by USR (US Robotics, now 3Com)

K56Flex and X2 are not interoperable.

•

V.90 Standard.

In February 1998, The ITU-T (ITU Telecommunication Standardization

Sector) agreed on the technical specifications for 56K modems (V.90) and has

approved in mid-September, 1998.

But, the modem driver can be updated to resolve fine points of operation

between different vendor's modems and unusual telephone line conditions.

1. Due to FCC limitations, speeds of 53kbps are the maximum

permissible transmit power levels during download

transmissions.Actual data speeds will vary depending on line

conditions.

2. In order to use the 56K feature, be sure to check if the

standards supported by the on-line service provider and the

modem are identical.

If you use a PBX phone system, you can not connect using

the 56K mode due to line loss.

Specification

•

Data communications.

V.90, K56Flex, V.34+, V.34, V.32terbo, V.32bis, V22bis, V.23, V.21,

BELL212A, BELL103J

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Samsung N640 User Manual Page 40