Cisco Cisco Prisma II EDR Receiver Technische Referenzen
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78-4016548-01 Rev C
Conversion Artifacts
Conversion Artifacts
As mentioned above, the digital signal processing (DSP) in the 2.5 Gb/s 4:1 bdr
products produces a Nyquist frequency just 0.5 MHz above the passband of interest.
In the 5-40 MHz version of the 2.5 Gb/s 4:1 bdr product, this is reflected in the
output after digital up-conversion as an effective Nyquist frequency of 40.5 MHz.
Consequently, signals in the reverse path spectrum will produce aliases in the
output with respect to this frequency. These aliases appear as images of the desired
signals mirrored around 40.5 MHz.
In the receiver, a low-pass filter after each D/A converter rolls off these aliases with
In the receiver, a low-pass filter after each D/A converter rolls off these aliases with
increasing frequency. However, a few aliased signals may appear in the range from
41 to approximately 47 MHz when input signals are applied at the transmitter in the
range of 34-40 MHz. These aliases do not represent any additional loading of the bdr
link, and generally are insignificant artifacts of the DSP process.