Prestige 861 Series
Benefits
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.
ZyXEL’s Prestige 861 series, which is a DMT-based
VDSL modem, supports a complete range of speeds
ranging from 64Kbps to 25Mbps. Symmetric speeds
for the Prestige 861 series range up to 25Mbps at
64Kbps increments while asymmetric speeds range
up to 52Mbps downstream and 26Mbps upstream at
64Kbps increments. The built-in 4-port switch
allows multiple devices to share the bandwidth
without the cost of additional network hardware.
DMT 3/4/5-band,
ATM-based VDSL Modem/Gateway
DMT Modulation — Standard Compliance and Outstanding Performance
The Prestige 861 series 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 861 series 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 861
series, 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.
An Instant LAN with an Integrated 10/100Mbps Switch
The combination of a switch makes the Prestige 861 series more efficient
and less expensive than a similar unit with an external switch or hub. The
industry-standard HP Auto MDI/MDIX features enable automatic and
transparent detection as well as automatic correction of cables. Product
installation, debugging, and network maintenance become substantially
easier and significantly more efficient.
VLAN Supports QoS for Service Differentiation
The VLAN feature in the Prestige 861 series offers the benefits of both
security and performance. For example, various priorities can be assigned to
differentiate real-time applications and Internet access applications via
VLAN tagging. Such control enables service providers to turn on various
broadband services to a larger number of customers more quickly and
economically.
