Cisco uBR-3x10 Hardware Installation And Cabling Manual page 21

Chapter 1 Cisco uBR-3x10 RF Switch Overview
Upstream Switch Modules
•
There are 10 upstream switch modules used in the Cisco uBR 3x10 RF Switch. The module operates
over the from 5 to 70 MHz. Each module has ten 75-ohm inputs accessed through the MCX connectors
on the backpanel of the RF switch (see
the upstream switches direct traffic to their respective default termination interfaces.
Upstream cables from the cable interface line cards are plugged into the CMTS MCX connections in the
Note
rear of the Cisco uBR 3x10 RF Switch. See
uBR10012 CMTS Cable Interface Line Cards,"
The upstream switch module takes the signal inputs (eight) from the power splitter and routes one of the
eight to a protect output, or splits the inputs into two groups of four and sets up the switches to select
one input (of a group of four) as a protect output. The relays are electromechanical, latching relays that
are controlled through an I
connector port to connector port during normal operation and more than 20 dB when operating in protect
mode.
Figure 1-5
Each upstream switch has a set of four LEDs that indicate the working status of the port as described in
Table
Table 1-2
LED Name
Protect 1
Protect 2
Error 1
Error 2
OL-1984-06
Cisco part number 74-2622-01 (See
2
C interface. The switch card provides a minimum of 60 dB of isolation from
Upstream Switch Card
Captive screw
1-2.
Upstream Switch Board LED Descriptions
Color
Green/Yellow
Green/ Yellow
Off/Yellow
Off/Yellow
Figure 1-5.)
Figure 1-2 on page 1-3). During normal system operation, all of
Chapter 4, "Cabling the RF Switch With the Cisco
for more information about cabling the RF switch.
Description
Indicates CMTS/PROTECT 1
Indicates CABLE PLANT/PROTECT 2
Indicates a channel problem 1
Indicates a channel problem 2
Cisco uBR-3x10 RF Switch Hardware Installation and Cabling Guide
Hardware Component Descriptions
Captive screw
1-7