Nokia M11 T66220, Руководство пользователя

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How your Nokia M11 works
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Copyright Nokia Networks Oy C33833001SE_00
6-1
Chapter 6
How your Nokia M11 works
This chapter introduces the principles according to which Nokia M11
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-plus and
send data at rates up to 1 Mbit/s. The data 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. M11 uses the Discrete
Multitone Technique (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 M11
can adapt to different telephone lines.
6.2 ATM over ADSL
Nokia M11 can carry ATM cells on the ADSL line. It is possible to
have up to eight (8) simultaneous connections to different networks
from a single M11. The operator can also establish one dedicated
management channel to M11.