Inter-Tel AXXESS Manual page 1097

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4.349 Hybrid Balance Test Process: With the Hybrid Balance Test process you can assess

the degree of impedance mismatching present between a loop/ground start trunk and a trunk

port connected to it. With accurate measurements of echo return loss (ERL), you can optimize

the loop/ground start trunk interface to minimize echo. IP endpoints that connect to the Public

Switched Telephone Network (PSTN) across loop/ground start trunks may be noticeably

reduced echo after carrying out the hybrid balance test process.

4.350 In v9.115 and later, the "Measured Echo Return Loss (ERL)" and "Last Hybrid Balance

Test Timestamp" flags have been added to the Trunks folder in DB Programming. See

for details about these flags.

4.351 To run a Hybrid Balance Test: Use the Hybrid Balance Test feature to verify loop/

ground start trunk characteristics and to determine the optimal Hybrid Balance setting for each

CO trunk port interface. To establish optimal Hybrid Balance setting for each loop/ground start

trunk, you will need to carry out the following process and applicable procedures in sequence.

Exceptions to the Rule: For the performance of the following procedures only, you may

enter the On-Line Mode (OLM) mode without the supervision of Inter-Tel Technical Support

personnel. Any further or other programming in OLM mode is strictly prohibited without spe-

cific guidance from Inter-Tel Technical Support personnel.

Set up Expanded Message Print capability in On-Line Monitor (OLM) programming

Verify that the "CO Timeout in seconds" timer is set to 4 seconds in OLM program-

Set up the Message Print client for Expanded Message Print (see

Run the Hybrid Balance Test for the loop/ground start trunks connected to the system

4.352 To obtain and maintain optimal Hybrid Balance settings for individual loop/ground start

trunk ports, adhere to the following guidelines:

Perform the test on each port at initial installation of the system.

Perform the test whenever a loop/ground start trunk connection is added or changed.

Run the test on a system that is idle or nearly idle.

Run the test until the greatest Echo Return Loss (ERL) measurement is within ±2 dB

twice in a row, as shown in Expanded Message Print. If the trunk port interface is opti-

mally balanced, successive ERL readings should not vary a great deal.

MANUAL VERSION 11.0 – May 2008

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