A-2
Cisco uBR-3x10 RF Switch Hardware Installation and Cabling Guide
OL-1984-06
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
<450 MHz:
>/=450 MHz, <550MHz
>/=550 MHz, <650 MHz
>/=650 MHz, <860 MHz
CMTS to Cable Plant
5.25 dB
5.50 dB
5.75 dB
6.00 dB
Protect to Cable Plant
6.25 dB
6.50 dB
7.00 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
