C-COR.net FlexNet E7 - When Preceding Cable Loss and Internal Equalization Are Known

C-2 FlexNet
®
700 Series Line Extender Rev F
C
For example, if you calculated an Equalization Value of 2dB, then you need an SEQ-862-03 equalizer
because:
Cable Simulator Selection (Negative Equalization Value)
Select a cable simulator from the appropriate table in Reference Tables on page C-5 that has a tilt as
close as possible to the desired Equalization Value. If the desired equalizer value is at the midpoint
between equalizer values, select the equalizer with the lower value. When selecting an equalizer, be
sure to account for the accessory’s tilt. The tilt for a particular accessory is calculated as follows:
For example, if you calculated an Equalization Value of –2dB, then you would need an SCS-862-03
cable simulator because:
When Preceding Cable Loss and Internal Equalization are Known
This procedure accounts for cable losses and the internal equalization of the E7 Line Extender. To use
the dB of Cable Equalized at Highest Frequency (for cable equalizers) and dB of cable simulated (for
cable simulators) columns of the E7 Line Extender Reference Tables, the amount of the factory installed
alignment of the E7 Line Extender (if any) must be known. This information is found on the E7 Line
Extender Specification Sheet.
1. Note the amount of cable loss the E7 Line Extender is designed to accommodate at the
highest system frequency as listed under Factory Alignment/Cable Loss on the E7 Line
Extender Specification sheet.
2. To determine the actual system cable loss at the highest frequency, do either of the following:
■ Refer to the System Map and note the cable loss in dB preceding the E7 Line Extender
being balanced.
■ Calculate the cable loss using cable length and the Manufacturer's Cable Loss Charts.
3.0 (Insertion Loss at 42MHz)
– 1.0 (Insertion Loss at 862MHz)
= 2.0 (Tilt for SEQ-862-03 Series Cable Equalizers)
Insertion Loss at Low Balancing Carrier
– Insertion Loss at High Balancing Carrier
=SCS Tilt
1.0 (Insertion Loss at 54MHz)
– 3.0 (Insertion Loss at 862MHz)
=–2.0 (Tilt for SCS-862-03 Series Cable Simulators)