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Digivance
®
NXD Digital
2
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Digivance
®
NXD
Digital Distributed RF
Overview
With the increasing popularity of wireless devices,
subscribers expect to have coverage at any time
in any place they may be. This requires service
providers to increase capacity, typically done by
adding new cell sites. However, with city center
areas becoming more congested and local
government zoning regulations increasingly more
stringent, obtaining permits for new wireless cell
sites is becoming very difficult. ADC’s Digivance
NXD is a cost effective solution for extending
or distributing capacity from base stations to
areas that require coverage, allowing the use of
city right-of-ways and easements for radio and
antenna locations.
Digivance NXD features the innovative FLEX
technology that offers the option of one, two,
three or four 15 MHz bands in a single cabinet.
This technology also provides digital simulcasting
-- the option of spreading the coverage of a
BTS sector across two or more transmit/receive
locations through digital signal processing. FLEX
technology allows multiple variable simulcast
arrangements for different bands or different
RF technologies. In addition, this technology
offers operators increased flexibility in meeting
fluctuating capacity demands. By allowing service
providers to change simulcast patterns through
the use of remotely controlled digital cross-
connect switches, FLEX technology can reallocate
capacity and reduce BTS costs. This technology
can also be integrated with Software Defined
Radio (SDR) to enable wireless networks of the
future.
Application
Digivance NXD is the most advanced long-range
RF distribution solution offering a fully digital
platform. By using patented digital RF transport
technology, Digivance NXD digitizes the entire
designated RF band, transports it over fiber,
and reconstructs the signal at full bandwidth,
regardless of modulation technology or data
rate. Digital RF transport allows the signal to be
replicated at full dynamic range, independent of
the fiber length, which increases the capability
for data throughput. As advanced high data
rate broadband services are rolled out, networks
designed using Digivance NXD are fully capable
of supporting any air interface standard.
Digivance NXD Applications Include:
• Neutral host deployments
• Wide area and medium range urban and
suburban microcells
• Capacity and coverage underlay to existing 2G
and 3G sites
• Multi-frequency, multi-operator deployments
• Campus environments and business parks
• Stadium and convention centers
System Description
Digivance NXD is an all-digital RF distribution
system that optically transports RF signals to
specific coverage areas. The Digivance NXD
comprises a centrally located hub where base
stations are connected, via fiber optic cable, to
a series of Radio Access Nodes (RANs). RANs
may be mounted on light standards, utility
poles, building walls, rooftops, or ground
pedestals in the targeted design areas. The
system is configurable and upgradeable in 15
MHz increments, with up to four independent
frequency blocks multiplexed into a single
digital link. A network operator can vary system
frequency blocks on a point-by-point basis to
match each individual market’s network strategy.
The Digivance NXD RAN is positioned near the
area requiring coverage and interfaces with an
antenna to distribute the RF signal. The distance
between the Digivance NXD hub and RAN unit is
limited only by time delay requirements of system
modulation standards; i.e., GSM, CDMA, etc.
Optionally, the course wave division multiplexing
(CWDM) features allow transport of multiple
digital RF digital links over a single fiber.
Multiple Digivance NXD links can be readily
deployed as a system to distribute capacity and
provide coverage to larger areas, such as an entire
city center area. The Digivance SNMP interface
provides operational and maintenance capabilities
for an unlimited number of NXD links.