Rev F
Configuration
4-5
4
Calculating Balancing Carrier Levels
Typically, only the Forward High Balancing Carrier level will need to be calculated (if it is not provided
by the system manager). All other balancing carrier levels are near enough to the signal levels of the
bandedge carriers that bandedge levels may be used for balancing.
Perform this calculation only when the Forward High Balancing Carrier is not at the high bandedge
frequency. This calculation method can speed the process of balancing and needs to be done only
once for all similar amplifiers within a cascade.
1. Obtain a copy of the
FlexNet® 700 Series Line Extender Data Sheet
If not available, copy the sample located in Appendix E.
2. Calculate the Forward High Balancing Carrier Level using the following equation:
L
C
= Forward High Balancing Carrier level (dBmV)
L
H
= System Output Level at the High Bandedge Frequency (dBmV)
L
L
= System Output Level at the Low Bandedge Frequency (dBmV)
F
H
= System High Bandedge Frequency (MHz)
F
L
= System Low Bandedge Frequency (MHz)
F
C
= Forward High Balancing Carrier frequency (MHz)
3. Copy the Forward High Balancing Carrier level to the appropriate box in the Map Signal
Information section of the
FlexNet® 700 Series Line Extender Data Sheet
.
Temperature Compensation
Typically, only the forward balancing carriers require temperature compensation. The effect of
temperature on the cable attenuation associated with the low frequency return balancing carriers is
minimal except in extreme conditions.
If the temperature surrounding an E7 Line Extender is between 50° F and 90° F (10° C and 32° C),
balancing carrier levels do not require temperature compensation.
L
C
L
H
L
L
–
F
H
F
L
–
----------------
F
C
F
L
–
(
)
L
L
+
´
=
Note
: Temperature compensation only applies to aerial coaxial cable. Use a 0dB
Temperature Compensation Value for all underground cable.
Summary of Contents for FlexNet E629
Page 2: ...Introduction fm Page 10 Monday April 1 2002 12 43 PM ...
Page 16: ...1 8 FlexNet 700 Series Line Extender Rev F 1 ...
Page 26: ...2 10 FlexNet 700 Series Line Extender Rev F 2 ...
Page 64: ...4 22 FlexNet 700 Series Line Extender Rev F 4 ...
Page 82: ...A 6 FlexNet 700 Series Line Extender Rev F A ...
Page 88: ...B 6 FlexNet 700 Series Line Extender Rev F B ...
Page 102: ...C 14 FlexNet 700 Series Line Extender Rev F C ...
Page 104: ...D 2 FlexNet 700 Series Line Extender Rev F D ...
Page 110: ...Index 4 Rev F ...
Page 111: ...Introduction fm Page 10 Monday April 1 2002 12 43 PM ...
