Installation guide

Configuring analog trunks 5-20
Chapter 5: Configuring Analog and Digital Trunks
Wave Global Administrator Guide
• CO Termination. Specifies the terminating impedance that the CO presents to Wave
trunk.
CO Termination is associated with the ACIM Value and generally does not need
to be changed.
For some locations, there may be an alternate value that can be tried. In North
America the terminating impedance presented by the CO is 900Ohms + 2.16uF. In
North America the alternate CO Termination value is 600 Ohms. This alternate choice
may sometimes apply if Wave is connected to a local PBX rather than directly to the
CO—some PBXs provide a 600 Ohm terminating impedance instead of the standard
900ohms+2.16uF presented by the CO.
•
Predefined/Custom. Select one of the following:
•
Predefined. Select this option to use the default hybrid coefficients based on the
selected
ACIM Value and Line Type. In almost all cases, this will result in
acceptable performance.
•
Custom. Select this option to define alternative hybrid coefficients in rare cases
where adequate performance cannot be obtained via a predefined
Line Type.
Caution: Identifying custom hybrid coefficient values should only be done
under the direction of your Vertical Technical Support representative.
• Line Type. Specifies the length and characteristics of the 2-wire cable that connects
the Wave Server to the CO. There are 8 predefined EIA line types, EIA 0 – EIA 7:
• EIA 0 represents the shortest cable length (under 2000 feet).
• EIA 6 and EIA 7 represent the longest and most complex line types.
Note: Testing has shown that EIA 3 is an appropriate setting for most installations. In
cases where EIA 3 is does not provide good performance, one of the other predefined
EIA line types can usually be found to provide adequate echo return loss performance.
•
Hybrid Coeff.1 - 8. If you selected Custom above, enter a value from 0-255 in the text
box for a specific hybrid coefficient. Click
Restore Defaults to discard your changes
and restore the default values.
3 To discard all of your changes and revert to the pre-defined system values, select the
Reset
All Trunks to Use System Defaults
checkbox.
4 Click
OK.
Release 2.0
September 2010