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2 Update to the Cisco uBR904 Cable Modem Installation and Conﬁguration Guide

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Table 1 CIsco uBR904 MCNS DOCSIS Compatibility Test Matrix

MCNS DOCSIS Compatibility Testing (BER

< or = 1 x 10

-8

)

Tests Performed Results

PHY (RF) End-to-End SNR

at Downstream Receiver

SNR Adjacent Channel Interference

Data Rate

MCNS

Speciﬁcation

Actual

Results

MCNS

Speciﬁcation

Actual

Results

Downstream

256 QAM

(5.360 Msps

, alpha 0.12) X – 30 dB 33 dB 30 dB

30.5 dB

31 dB

33 dB

33.5 dB

34 dB

64 QAM

(5.057 Msps

, alpha 0.18) X X 23.5 dB 23.5 dB 23.5 dB

23.7 dB

23.5 dB

23.7 dB

Upstream

16 QAM

(1.280 Msps

, alpha 0.25) X – 30 dB 30 dB – –

QPSK

(1.280 Msps

, alpha 0.18) X – 30 dB 30 dB – –

1. BER = bit error rate.

2. SNR = signal-to-noise ratio.

3. QAM = quadrature amplitude modulation.

4. Msps = Megasymbols per second. A symbol is the basic unit of modulation.

5. Analog or digital adjacent channel, 0 decibels relative to carrier (dBc) located at 6MHz from the desired channel.

6. Analog adjacent channel, 10 dBc located at 6MHz from the desired channel.

7. Digital adjacent channel, 10 dBc located at 6MHz from the desired channel.

8. Analog adjacent channel (10 dBc) or digital adjacent channel (0 dBc) located at 6MHz from the desired channel.

9. QPSK = quadrature phase shift keying.

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