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| Application overview
The advent of Mini-DSLAMs (Digital Subscriber Line Access
Multiplexer) is enabling telecommunications companies to deliver
broadband access to remote business enterprises and subscribers
in low-density and sub-urban environments. Where subscribers
are located beyond the limited DSL reach from a main exchange,
point-to-point digital microwave radio systems enable Mini-DSLAMs
to connect back to the broadband network. These highly effective,
mini points-of-presence can be mounted in roadside cabinets
to successfully leverage an existing wired infrastructure
and deliver broadband DSL access. The systems are typically
deployed where the speed or costs of deployment for wired,
fiber, or satellite communications are not commercially feasible
or viable due to distance, difficult terrain or harsh environments. |
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| Commercial perspectives
This microwave radio solution enables carriers to [1] swiftly-build
broadband access networks and extend services over longer
distances and difficult terrain [2] generate new revenue streams
and profitably answer governmental imperatives for rural broadband
access, and [3] leverage and realise greater returns on their
wired infrastructure. |
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| Aprisa™
digital microwave radios
The 4RF Communications Aprisa digital microwave radio enables
connectivity between two fixed points and the transmission
of Internet, voice and data traffic over distances up to 100
kilometres. They connect for example a mini point-of-presence
and a DSL Local Loop to the broadband network and PSTN exchange.
They transport a wide-range of broadband enabled services
including Internet, VPN and LAN interconnect, VoIP, video
conferencing, web-hosting and
E-business applications; and
voice services for telephone and fax. |
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| Aprisavantage
The Aprisa radio confers two key benefits for telecommunications
companies and network operators establishing mini points-of-presence
and extending DSL reach.
Superior performance Sub
3 GHz licensed frequency bands enable extremely reliable transmission
over long distances and difficult terrain, particularly over
water and partly obscured paths. These regulated bands permit
exclusive frequency assignment guaranteeing carrier-class
performance and minimizing interference. The RF design integrates
high-performance digital processing techniques including FEC
(Forward Error Correction), interleaving and advanced radio
equalization to minimize transmission degradation from interference
and atmospheric effects. Sophisticated modulation techniques
in the radio platform enable highly efficient transmission
in narrow channels. This enables the optimisation of available
spectrum where that resource may be limited and/ or expensive.
Greater flexibility The design
of the Aprisa enables swift network integration and redeployment.
The radio features an in-built multiplexer managing Internet,
voice and data traffic. This multi-use platform enables the
delivery of bundled Internet and voice services. It creates
new revenue opportunities and reduces costs by eliminating
the requirement for external equipment. Advanced plug-in,
customer-configurable interface modules support circuit-switched
2-Wire POTS, E1/T1 (for ATM PPPoA DSLAMs) and packet-switched
IP/Ethernet (for PPPoE DSLAMs).
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