Nokia M10, User Manual

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How your Nokia M10 works
DRAFT
Copyright Nokia Telecommunications Oy NTC C33539002SE_A0
6-1
Chapter 6
How your Nokia M10 works
This chapter introduces the principles according to which Nokia M10
operates.
6.1 ADSL
ADSL stands for asymmetric digital subscriber line. It is a technology
that enables the use of your normal telephone wires for very high speed
data transmission. With ADSL technology, you can retrieve data from
network through the telephone wires at rates up to 8 Mbit/s and send
data at rates up to 1 Mbit/s. The achievable rate depends on the length
of the telephone cable from your premises to the central office, as well
as noise and disturbances in the cable. The ADSL technology adapts to
the line length and other line conditions and adjusts the speed in 32
kbit/s steps.
ADSL is standardized by both ANSI and ETSI. It uses the so-called
Discrete Multitone Techniques (DMT). In DMT, the data is sent over
the telephone wires in multiple 4 kHz channels. By tuning the use of
these channels and the information content of these channels Nokia
M10 can adapt to different telephone lines.
6.2 ATM and frames over ADSL
Nokia M10 can carry ATM cells or HDLC frames on the ADSL line.
The use of cells or frames depends on the application. When M10 uses
ATM, it is possible to have up to eight (8) simultaneous connections to
different networks from a single M10.