C-COR.net FlexNet E7, Руководство по эксплуатации оборудования

Страница: 89 / 112

Rev F Reference Tables C-1
A P P E N D I X C
Reference Tables
This section presents product tables that support the balancing procedures of Forward Balancing on
page 4-8 and Return Balancing on page 4-12.
Use Of Reference Tables —page C-1
Installing Plug-in Accessories —page C-3
Reference Tables —page C-5
Use Of Reference Tables
There are two methods for using the Reference Tables to determine the correct accessory needed to
balance a FlexNet ® 700 Series Line Extender:
■
When the Equalization Value is Known
■
When Preceding Cable Loss and Internal Equalization are Known
When the Equalization Value is Known
This procedure assumes prior calculation of the Equalization Value as defined in the Forward Balancing
procedure (Refer to Forward Balancing on page 4-8.)
■
If the Equalization Value calculated during Forward Balancing is positive, you will need to use
an equalizer to balance the E7 Line Extender and should refer to Equalizer Selection (Positive
Equalization Value) .
■
If the Equalization Value calculated during Forward Balancing is negative, you will need to
use a cable simulator to balance the E7 Line Extender and should refer to Cable Simulator
Selection (Negative Equalization Value)
on page C-2.
Equalizer Selection (Positive Equalization Value)
Select an equalizer from the appropriate equalizer 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:
Insertion Loss at Low Balancing Carrier
– Insertion Loss at High Balancing Carrier
= SEQ/MEQ Tilt