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Two-Way Data Headend Architecture
Two-Way Data Headend Architecture
Figure 4-1
and fax.
Figure 4-1
Typical Cable Headend Configuration for Two-Way Data
Upstream
0 dBmV
2-way
splitter
2-way
splitter
2-way
splitter
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
4-2
shows a typical headend configuration configured for two-way data, including digitized voice
Cisco
uBR7225VXR
Downstream
+10 dBmV
6 dB
3 dB
X
attenuator
attenuator
Diplex filter
40 dB
Downstream
L H
attenuator
(0 to +5 dBmV)
C
Cable
modem
+10 dBmV
6 dB
8 dB
X
attenuator
attenuator
Diplex filter
40 dB
Downstream
L H
attenuator
(0 to +5 dBmV)
C
Cable
modem
+10 dBmV
6 dB
21 dB
X
attenuator
attenuator
Diplex filter
40 dB
Downstream
L H
attenuator
(0 to +5 dBmV)
C
Cable
modem
Chapter 4
Connecting the Cisco uBR7225VXR Router to the Cable Headend
Main
headend feed
8-way
tap
0 to 20 dB
attenuator
(as required)
Optical
Reverse optical
receiver Fiber-optic
transmitter
+13 dBmV
cable
Reverse optical
Optical
transmitter
receiver Fiber-optic
+18 dBmV
cable
Reverse optical
Optical
transmitter
receiver Fiber-optic
+31 dBmV
cable
Laser
transmitter
+17 dBmV
Broadcast
video carrier
(typical)
Narrowcast
+7 dBmV
3-way
data carrier
splitter
(typical)
+17 dBmV
Distribution
network
+17 dBmV
Distribution
network
+17 dBmV
Distribution
network
Node 1
Optical
splitter
Node 2
Downstream
forward
test point
+31 dBmV
+48 dBmV
Modem
Cable
transmit
modems
levels
+58 dBmV
+42 dBmV
Modem
transmit
levels
+50 dBmV
+42 dBmV
+49 dBmV
Modem
transmit
levels
OL-17309-01
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Troubleshooting
