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Specifications
The DCM 32 corresponds to the specification
MCNS DOCSIS 1.0,1.1, 2.0. The DCM 42 corre-
sponds to the specification EURODOCSIS
1.0,1.1, 2.0.
Downstream
Demodulation 64 QAM / 256 QAM
Input level -15 dBmV to +15 dBmV
Input impedance
75 Ω
Return loss >6 dB from 88 MHz to 860 MHz
DCM 32
Physical speed 30 Mb/s (64 QAM) / 43 Mb/s (256 QAM)
Error correction Reed Solomon + Trellis (ITU-T J.83 Annex B)
Frequency range 88 MHz to 860 MHz (edge frequencies) in
62.5 kHz steps
Band width 6 MHz
DCM 42 / 42 I
Physical speed 42 Mb/s (64 QAM) / 56 Mb/s (256 QAM)
Error correction Reed Solomon (ITU-T J.83 Annex A)
Frequency range 108 MHz to 860 MHz (edge frequencies) in
250 kHz steps
Band width 8 MHz
Upstream
Access method TDMA, S-CDMA (DOCSIS 2.0)
Modulation
QPSK, 8-,16-, 32- and 64QAM, 128QAM with S-CDMA only
Modulationsrate TDMA: 160, 320, 640, 1280, 2560 und 5120 kHz
S-CDMA: 1280, 2560 and 5120 kHz
Bandwidth TDMA: 200, 400, 800, 1600, 3200 and 6400 kHz
S-CDMA: 1600, 3200 and 6400 kHz
Output level TDMA:
+8 dBmV to 53 dBmV (32QAM, 64QAM)
+8 dBmV to 55 dBmV (8QAM, 16QAM)
+8 dBmV to 58 dBmV (QPSK)
S-CDMA:
+8 dBmV to 53 dBmV (all Modulations)
Max. Bitrate 30 Mbit/s (with A-TDMA- or S-CDMA)
Error correction Reed Solomon