Cisco Systems UBR7100E manual RF Specifications, Docsis Upstream and Downstream Specifications

Appendix A System Specifications

RF Specifications

RF Specifications

Table A-3 Typical RF Upstream Bandwidth and Modulation

Upstream Bandwidth	QPSK Data Throughput	16 QAM Data Throughput
200 kHz	0.3 Mbs	0.6 Mbs
400 kHz	0.6 Mbs	1.2 Mbs
800 kHz	1.2 Mbs	2.3 Mbs
1600 kHz	2.3 Mbs	4.5 Mbs
3200 kHz	4.6 Mbs	9.0 Mbs
Table A-4 Typical RF Downstream Modulation
Downstream Bandwidth	64 QAM Data Throughput	256 QAM Data Throughput
6 MHz	27.0 Mbs	38.0 Mbs
8 MHz	38.0 Mbs	56.0 Mbs

DOCSIS Upstream and Downstream Specifications

The recommended settings listed in the following tables are based on a hybrid fiber-coaxial cable (HFC) network in which the digital signal is carried 10 dB below the adjacent analog video channel. If the digital signal on your network is carried 6 dB below the adjacent analog video channel, add 4 dB to the recommended settings in Table A-5and Table A-6.

Table A-5 DOCSIS Cable Upstream RF Specifications

Specification	DOCSIS Specifications1	Minimum Settings2	Your Headend Settings
System/Channel
Frequency range	5 to 42 MHz	5 to 42 MHz
Transit delay, CMTS to furthest	< 0.800 ∝sec	< 0.800 ∝sec
customer
Carrier to noise ratio	> 25 dB (QPSK3)4	> 21 dB (QPSK)4
	> 25 dB (16 QAM5)4	> 24 dB (16 QAM)4
Carrier to ingress power ratio	> 25 dB	> 25 dB
Carrier to interference ratio	> 25 dB (QPSK)4	> 21 dB (QPSK)4
	> 25 dB (16 QAM)4	> 24 dB (16 QAM)4
Carrier hum modulation	< –23 dBc6 (7%)	< –23 dBc (7%)
Burst noise	< 10 ∝sec	< 10 ∝sec
Amplitude ripple	0.5 dB/MHz	0.5 dB/MHz
Group delay ripple	200 ns/MHz	200 ns/MHz
Micro reflections (single echo)	–10 dBc @ < 0.5 ∝sec	–10 dBc @ < 0.5 ∝sec
	–20 dBc @ < 1.0 ∝sec	–20 dBc @ < 1.0 ∝sec
Cisco uBR7100 Series and Cisco uBR7100E Series Universal Broadband Router Hardware Installation Guide
OL-5916-01				A-3