ADC Digivance NXD User Manual
Digivance® NXD
Digital Distributed RF
High-Capacity, Multi-Operator, Multi-Band
Digital Distributed Antenna System
ADC’s Digital Advantage
ADC, a leading solution provider for distributing and enhancing wireless capacity and coverage,
now offers the Digivance NXD. The Digivance NXD is a fully Digital Distributed Antenna System
(D-DAS) designed to specifically meet a service provider’s current network needs and provide a fully
flexible path to future network migration. The Digivance product improves wireless networks by
extending seamless wireless coverage from existing cell sites to hard-to-reach areas, or distributing
capacity from centralized radio suites.
Spec Sheet
Digivance NXD is a member of ADC's family of digital radio frequency (RF) transport solutions that
include the Digivance CXD, the Digivance Long-Range Coverage Solution (LRCS), Digivance StreetLevel Coverage Solution (SCS), and the Digivance Indoor Coverage Solution (ICS). ADC leverages
its expertise in wireless technologies, as the industry leader in fully digital, multi-frequency digital
DAS network equipment, providing network operators with predictable and highly controllable RF
coverage and capacity solutions.
Features
• Flexible architecture enables macro network coverage to be distributed over individual or
multiple point-to-point optical RF transport links
• Optimized for neutral host operators, able to co-locate multiple operators at a single location
• Digital RF transport is transparent to air modulation standards; e.g., GSM, CDMA, etc.
• Individual modules for 800, 850, and 1900 MHz frequency blocks
• Field upgradeable in single block increments
• Digital simulcasting, system capable of digital switching of radio sectors
• Fully digital transport for precise system settings and management
• Open standard SNMP-based interface, remote control and alarming using commercial Network
Management Systems (NMS)
• Local alarming and control using embedded Element Management System (EMS)
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Digivance® NXD
Digital Distributed RF
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NXD Digital
Digivance
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 crossconnect 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.
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Digivance® NXD
Digital Distributed RF
®
NXD Digital
Digivance
Digital Quality
ADC's Digivance digital platform gives a network
operator the feature set it needs to build high
quality networks for its customers. The Digivance
system offers precise time delay control, high
dynamic range, and predictable performance over
time, distance, and temperature.
ADC’s D-DAS technology allows for digital
simulcasting of radio sectors for seamless capacity
distribution and improved network efficiencies.
Simulcast patterns and sector planning can be
dynamically modified using ADC digital switching
technology for changing usage patterns and
improved management of base station resources
Unmatched Network Control
The rich feature set of the Digivance system,
along with the advantages of digital RF transport,
enables network operators to configure,
optimize, and operate their networks securely
and independently on a frequency block basis.
Centralization of base station capacity can also be
realized using Digivance NXD, allowing wireless
service providers to further benefit by reducing
capital expenditures and annual operating costs.
Networks can be designed and configured to
satisfy current coverage and capacity needs, and
easily adapt and migrate as consumer demands
dictate, through the deployment of additional
RANs to the network, or the addition of more
channel capacity at the central hub. All system
hardware elements can be remotely monitored
and controlled via a Digivance SNMP interface
into commercially available NMS
Benefits
• Individual modules for each frequency block
• Common carrier system for all wireless
operators
• Independent power amplifiers for each
frequency block, autonomous operation of
multiple services
• Fully digital for precise system settings and
management
• Open standard SNMP-based Element
Management System
• Battery backup options, glitch and 1-2 hour
internal
• Secure and reliable digital fiber transport
• Compatible with E911 Network Overlay and
GPS-based position location services
With the Digivance architecture, an operator’s
network is ready to meet today’s needs and those
required in the future.
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