Overview; Configuring An Atm Oc-3C/Stm-1 Interface; Adsl Interface Configuration - 3Com MSR 50 Series Configuration Manual

Overview

Configuring an ATM
OC-3c/STM-1 Interface
ADSL Interface
Configuration
Overview
This section covers only the physical configurations of the interface. For more
information about how to configure ATM (including PVCs), refer to
Configuration" on page
Follow these steps to configure an ATM OC-3c/STM-1 interface:
To do...
Enter system view
Enter ATM OC-3c/STM-1
interface view
Set the clock mode
Set the framing format
Enable scrambling
Set the loopback mode
This section covers these topics:
"Overview" on page 72
■
"Configuring an ADSL Interface" on page 79
■
"Upgrading ADSL2+ Card Software" on page 79
■
ADSL Technologies
Asymmetric digital subscriber line (ADSL) is an asymmetric transmission
technology that implements high-speed data transmission over twisted-pair
copper wire by using unused high frequency ranges in the regular telephone line
with different modulation method. Normally, in the uplink band of 26 kHz to 138
kHz, ADSL can provide transmission rates up to 640 kbps (uplink) and in the
downlink band of 138 kHz to 1.104 MHz, it provides transmission rates up to 8
Mbps (downlink).
Some latest ADSL technologies, however, can provide faster transmission rates by
improving modulation rate, coding gain, initialization state machine, by reducing
frame head overhead, and by using enhanced signal processing methods. For
example, given the same bands, ADSL2 can provide uplink transmission rates up
to 1024 kbps and downlink transmission rates up to 12 Mbps. By expanding the
downlink band from 1.104 MHz to 2.208 MHz, ADSL2+ can even provide a
downlink rate as fast as 24 Mbps.
The transmission speed of ADSL is susceptible to transmission distance and line
quality. While increased transmission distance means decreased line quality and
transmission rate, decreased transmission distance means the contrary. When
setting up a link, ADSL can automatically make tuning for a reasonable speed
taking into consideration actual line conditions such as distance and noise.
127.
Use the command...
system-view
interface atm
interface-number
clock { master | slave }
frame-format { sdh | sonet } Optional
scramble
loopback { cell | local |
remote }

ADSL Interface Configuration

"ATM
Remarks
--
Required
Optional
The default is slave.
The default is the SDH STM-1
format.
Optional
Enabled by default
Optional
Disabled by default
77