R2511-HP MSR Router Series Interface Configuration Guide(V5)

75
Ste
p
Command Remarks
8. Set the target SNR margin.
shdsl snr-margin [ current
current-margin-value ] [ snext
snext-margin-value ]
Optional.
By default, current-margin-value is
set to 2, and snext-margin-value is
set to 0.
9. Set the power spectral density
(PSD) mode.
shdsl psd { asymmetry |
symmetry }
Optional.
The default setting is symmetry.
10. Set the power back-off (PBO)
value, which reduces the
transmit power.
shdsl pbo { value | auto }
Optional.
The default setting is auto.
11. Specify the capability type.
shdsl capability { auto | g-shdsl |
g-shdsl-bis }
Optional.
• When the interface operates in
CPE mode, all three keywords
are supported, and the auto
keyword applies by default.
• When the interface operates in
CO mode, only the g-shdsl and
g-shdsl-bis keywords are
supported, and the g-shdsl-bis
keyword applies by default.
12. Set the pulse amplitude
modulation (PAM)
constellation.
shdsl pam { 16 | 32 | auto }
Optional.
The default setting is auto.
13. Enable SHDSL line probing.
shdsl line-probing enable
Optional.
SHDSL line probing is enabled by
default.
14. Set the intended bandwidth
for the G.SHDSL interface.
bandwidth bandwidth-value Optional.
15. Restore the default settings for
the G.SHDSL interface.
Default Optional.
Configuring an EFM interface
The following matrix shows the interface and router compatibility:
Interface MSR900 MSR93
X
MSR20-1
X
MSR20 MSR30 MSR50 MSR1000
EFM No No
Yes with only
the MSR20-13
Yes Yes Yes No
Ethernet First Mile (EFM) interfaces receive and transmit Ethernet frames over ATM physical links and use
the Ethernet protocol suite. They can transmit Ethernet frames over legacy DSL lines and thus achieve
all-Ethernet access. By encapsulating Ethernet packets and achieving stable and high speed data
transmission over telephone lines, EFM extends the transmission distance of Ethernet from 100 meters to
1500 meters, greatly popularizing Ethernet applications. With EFM interfaces, the already popular
Ethernet technologies can be deployed on the access networks of telecom users, greatly improving the
network performance as well as lowering the device and operation costs.