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Product >> DSL CPE >> VDSL >> Prestige 871
Prestige 871
DMT 3/4/5-band, IP-based
VDSL Modem
VDSL, the fastest offering of
DSL, provides significantly higher
bandwidth than other DSL technologies.
VDSL technology, which is similar
to that of ADSL, uses existing
copper wires to deliver high-speed
data services.
The major issues with VDSL technology are the
line codes to be employed, which can be divided
into either single-carrier or multi-carrier
modulation schemes. For example, QAM is the
most widely used form of single carrier systems
while DMT, the standard line code for ADSL,
is the primary form of multi-carrier modulation.
Both QAM- and DMT-based systems can be designed
for VDSL applications. However, DMT modulation
dynamically adapts the bit rate to conditions
on the local loop and offers excellent performance
even over noisy lines.
To provide VDSL service to end users, Telcos
in different areas may have different deployment
strategies unique to their existing and future
network plans. Ethernet in the First Mile (EFM)
is increasingly being adopted by service providers
and is being evaluated by Telcos who have traditionally
used ATM networks in the past. Without the
ATM layer, networks become more cost-effective,
flexible, and efficient. The Prestige 871,
which is built without ATM, perfectly fits
the network demands of today and tomorrow.
ZyXEL's Prestige 871 DMT-based VDSL modem supports
a complete range of speeds ranging from 64Kbps
to 25Mbps. Symmetric speeds for the Prestige
871 range up to 25Mbps at 64Kbps increments
while asymmetric speeds range up to 52Mbps
downstream and 26Mbps upstream at 64Kbps increments.
Benefits
DMT Modulation - Standard Compliance
and Outstanding Performance
The Prestige 871 is a DMT (Discrete Multi-Tone)-based
VDSL CPE. DMT modulation dynamically adapts
the bit rate to conditions on the local
loop and offers excellent performance even
over noisy lines. Network administrators
become free from manually testing lines
and from constantly adjusting equipment
to noise conditions. Both IEEE 802.3ah
Ethernet in the First Mile (EFM) Task Force
and IEEE T1E1.4 Working Group selected
DMT as its worldwide VDSL line-coding standard.
Bandwidth of over 25 Mbps Per Port in
Full Duplex
The high-bandwidth Prestige 871 allows
service providers to simultaneously deliver
a variety of value-added services, such
as broadband Internet access and multiple
streaming video channels. With the Prestige
871, small to medium business users can
have much higher bandwidth for both symmetric
and asymmetric applications while home
users can enjoy interactive media-rich
entertainment which was previously unavailable.
Triple Play over Existing Copper Wires
With VDSL, traditional "copper wire" telecom
operators may begin offering "triple play" multimedia
services such as multiple high-quality
digital video streams, high-speed Internet
access, and voice services in a way which
provides a user experience similar to today's
other existing distribution systems (cable,
terrestrial, satellite). New revenue can
be generated with a minimal amount of installation
time and expense.
Co-existence with Plain Old Telephone
Service (POTS), ISDN and Digital Phones
VDSL can be implemented quickly, even if
there is only one phone line per tenant.
The existing POTS or ISDN services may
be kept while adding new broadband services.
Best CPE for EFM Applications
Due to Ethernet's relatively low cost,
simplicity, flexibility, ubiquity and high
bandwidth, there has recently been growing
momentum in the use of Ethernet in access
networking. Such trends in access networking
make the Prestige 871 a perfect solution
for EFM (Ethernet First Mile) applications. |
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