C H A P T E R 4 Connecting The Cisco Ubr7200 Series Router To The Cable Headend; Two-Way Data Headend Architecture - Cisco 7246 - uBR Router Hardware Installation Manual

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
6 dB
attenuator
2-way
splitter
40 dB
attenuator
6 dB
attenuator
2-way
splitter
40 dB
attenuator
6 dB
attenuator
2-way
splitter
40 dB
attenuator
Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide
4-2
shows a typical headend configuration configured for two-way data, including digitized voice
Cisco uBR7200
series router
Upconverter
Downstream
+10 dBmV
+13 dBmV
3 dB
X
attenuator
Diplex filter
Downstream
L H
(0 to +5 dBmV)
C
Cable
modem
+10 dBmV
+18 dBmV
8 dB
X
attenuator
Diplex filter
Downstream
L H
(0 to +5 dBmV)
C
Cable
modem
+10 dBmV
+31 dBmV
21 dB
X
attenuator
Diplex filter
Downstream
L H
(0 to +5 dBmV)
C
Cable
modem
Chapter 4 Connecting the Cisco uBR7200 Series Router to the Cable Headend
Main
headend feed
Broadcast
8-way
Narrowcast
tap
0 to 20 dB
3-way
attenuator
splitter
(as required)
Optical Reverse optical
receiver Fiber-optic transmitter
+17 dBmV
cable
Reverse optical
Optical
transmitter
receiver Fiber-optic
+17 dBmV
cable
Reverse optical
Optical
transmitter
receiver Fiber-optic
+17 dBmV
cable
Laser
transmitter
Node 1
+17 dBmV
Optical
video carrier
splitter
(typical)
Node 2
+7 dBmV
Downstream
data carrier
forward
(typical)
test point
+31 dBmV
Distribution
+48 dBmV
network
Modem
Cable
transmit
modems
levels
+58 dBmV
Distribution
+42 dBmV
network
Modem
transmit
levels
+50 dBmV
+42 dBmV
Distribution
network
+49 dBmV
Modem
transmit
levels
OL-5421-03