Cisco Systems UBR-3X10 manual RF Specifications

Appendix A Specifications and Component Part Numbers

RF Specifications

RF Specifications

The following table lists the RF specifications for the Cisco uBR 3x10 RF Switch.

Table A-2	RF Specifications
Description		Specification
Input/output impedance		75 ohms
Maximum RF input power		+15 dBm (63.75 dBmV)
Switch type		Electromechanical, absorptive for working path on-absorptive on the protect path
Switch settling time per switch board		20 ms. maximum
Downstream frequency range		54 to 860 MHz
Typical downstream insertion loss		CMTS to Cable Plant	Protect to Cable Plant
<450 MHz:		5.25 dB	6.25 dB
>/=450 MHz, <550MHz		5.50 dB	6.50 dB
>/=550 MHz, <650 MHz		5.75 dB	7.00 dB
>/=650 MHz, <860 MHz		6.00 dB	8.00 dB
Downstream insertion loss flatness		±1.1 dB from CMTS to Cable Plant; ± 2.1 dB from Protect to Cable Plant
Downstream output return loss		>15.0 dB at <450 MHz; >12.0 dB at >/= 450 MHz
Downstream input return loss		>15.0 dB
Downstream isolation		>60 dB channel to channel in working mode; >52 dB from CMTS to Protect when
		in protect mode
Upstream frequency range		5 to 70 MHz
Typical upstream insertion loss		4.1 dB from cable plant to CMTS; 5.2 dB from cable plant to Protect
Upstream insertion loss flatness		± 0.4 dB from Cable Plant to CMTS; ± 0.6 dB from Cable Plant to Protect
Upstream input return loss		>16 dB
Upstream isolation		>60 dB channel to channel in working mode; >60dB from CMTS to Protect when
		in protect mode
Protect mode		CMTS return loss: >10 dB; Cable Plant return loss: >10 dB

Cisco uBR-3x10 RF Switch Hardware Installation and Cabling Guide

A-2 OL-1984-06