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© Sage Instruments 2000
9100-2930-02 01/31/00
Sage Instruments 930i Communications Test Set
11. Press k4 under
MORE
to advance to the
ECHO CANCELLER
display:
ECHO CAN: FAR-EC NEAR-EC DISABLER MORE
K1
K2
K3
K4
12. Press the soft key (K1-K4) under an echo canceller to select or deselect it. You may choose a
Far End Echo Canceller (FAR-EC), Near End Echo Canceller (NEAR-EC), or an echo
canceller disabler test.
Note: G.165 echo cancellers are used to suppress unwanted echoes from the transmitted signal on
a circuit. These are the most common type of echo canceller, and react to phase reversal.
Some circuits may also have older G.164 echo cancellers (echo suppressors), which do not react
to phase reversal. These echo suppressors turn off tranmission in the reverse direction while a person
is talking in order to suppress echoes. Such suppression, however, impedes fully duplexed data, such
as the bidirectional flow of data between two modems and bidirectional BERT tests.
The echo canceller disabler on the 930i send a tone (2100 Hz with phase reversal) for 1500 ms, which
is ITU compliant with G.165 echo cancellers. This tone is designed to disable all G.165 echo
cancellers, although it also disables all G1.64 echo cancellers on a circuit.
During an echo canceller test, the 930i sends a 500 ms pause just before the test, which re-enables
both the G.165 and G.164 echo cancellers. It then sends another 2100 Hz signal (no phase reversal)
for 800 ms, which disables only the G.164 echo cancellers, thereby allowing the G.165 echo
cancellers to be tested independently.
13. Press K4 under
MORE
. If you selected a PCM trunk, you will advance to the following
BERT
display. (If you are in an analog trunk type, you will skip to the
CMS TONE LOCKING
display.)
BERT 2
↑
11-1 600 SECS EXIT
K1
K2
K3
K4
14. Press K2 to modify the BERT test duration.
15. Use the numeric keypad to enter a new test duration.
• A valid test duration is between 10
SECS
and 600
SECS
.
16. Press K4 under EXIT to advance to the
CMS TONE LOCKING
display:
CMS TONE LOCKING? YES NO
K1
K2
K3
K4
Option Menu #:
66
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