1 256-QAM - SCTE - Alaska

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Downstream Integrity Digitally Modulated Carrier In-Channel Flatness Courtesy Agilent Technologies and Sunrise Telecom 256-QAM © 2003, Cisco Systems, Inc. All rights reserved. 24
Group Delay • Group delay is defined in units of time, typically nanoseconds (ns) • In a system, network or component with no group delay, all frequencies are transmitted through the system, network or component with equal time delay • Group delay causes intersymbol interference, which degrades BER performance Frequency response problems in a CATV network may cause group delay Group delay also is common near band edges or rolloff areas 256-QAM © 2003, Cisco Systems, Inc. All rights reserved. 25
Page 1 and 2: 256-QAM © 2003, Cisco Systems, Inc
Page 3 and 4: Why 256-QAM? • Higher data throug
Page 5 and 6: First things first Those performanc
Page 7 and 8: DOCSIS 1.0 Downstream RF Channel Tr
Page 9 and 10: DOCSIS 1.0 Upstream RF Channel Tran
Page 11 and 12: Headend RF Levels—External Upconv
Page 13 and 14: Headend Bit Error Rate Performance
Page 15 and 16: Other DOCSIS RFI Spec Parameters
Page 17 and 18: Other Euro-DOCSIS RFI Spec Paramete
Page 19 and 20: Digitally Modulated Carrier CNR vs.
Page 21 and 22: Downstream Integrity • How can on
Page 23: Downstream Integrity • Amplitude
Page 27 and 28: System performance • Forward and
Page 29 and 30: 256-QAM Checklist Entire cable net
Page 31 and 32: DOCSIS Checklist Headend (downstrea
Page 33 and 34: DOCSIS Checklist Downstream input t
Page 35 and 36: DOCSIS Checklist CMTS upstream inpu

1 256-QAM - SCTE - Alaska

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