Cisco Model 6944 and 6940 Node bdr Dig Rev 2 1 Mux System for Prisma II Installationsanleitung
Improving the Performance and Capacity
of Digital Reverse Systems
A Study of System Performance using 4:1 bdr Technology
By David Graves
Abstract
As upstream signals become more numerous and valuable to the cable customer, the need for
efficient use of radio frequency (RF) and optical spectrum becomes more acute. Digital
reverse systems have increased the capacity of the upstream optical spectrum by populating
each optical wavelength of a dense wave division multiplexing (DWDM) system with two
reverse data streams using 2:1 time domain multiplexing in the digital space.
efficient use of radio frequency (RF) and optical spectrum becomes more acute. Digital
reverse systems have increased the capacity of the upstream optical spectrum by populating
each optical wavelength of a dense wave division multiplexing (DWDM) system with two
reverse data streams using 2:1 time domain multiplexing in the digital space.
The logical extension of this trend is to place more digital information on each optical
wavelength. To date, however, this has meant taking unacceptable reductions in performance
or unacceptable increases in cost. In this paper, we will examine a way of creating a 4:1 time
domain multiplexing system without a substantial reduction in performance, and at the same
time decreasing the cost of transporting reverse path signals.
wavelength. To date, however, this has meant taking unacceptable reductions in performance
or unacceptable increases in cost. In this paper, we will examine a way of creating a 4:1 time
domain multiplexing system without a substantial reduction in performance, and at the same
time decreasing the cost of transporting reverse path signals.
Understanding this new approach to digital multiplexing involves a fresh look at an
industry-accepted benchmark, the noise power ratio (NPR) performance curve. Some
assumptions and applications that previously have been valid need to be clarified to
understand the system application of emerging technologies.
industry-accepted benchmark, the noise power ratio (NPR) performance curve. Some
assumptions and applications that previously have been valid need to be clarified to
understand the system application of emerging technologies.
In This White Paper
This white paper contains the following topics.
Topic See
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4000819 Rev B
Improving the Performance and Capacity of Digital Reverse Systems
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