BRX-XLR User Guide
36
180-0145-001-R05
Verify that the lightning protectors at the NID are
in good working condition. Blown protectors
would short the line making the POTS
malfunction.
Note the REN number for each phone connected
to the line and sum them all. If the sum is higher
than 5, the high number of phones is loading the
line during ringing phase. Disconnect phones one
by one until the number get below 5.
While ringing, measure the AC rms voltage at the
NID. The reading should be between 40Vrms to
105Vrms
13. There is a humming noise on the
telephone (POTS) that was not
present before installing the BRX-
XLR
You should have the following equipment to help you
troubleshoot the problem:
- ADSL2+ Test Set from vendors such as: JDSU,
EXFO …
- Standard Telephone Test set
With the house disconnected at the NID and the
BRX-XLR installed on the copper pair, verify if
the audible hum noise is still present. If the noise
disappears then the problem is with the house
wiring.
Verify that the TIP-ground AC voltage matches
the RING-ground voltage and that the level is
less than 5VAC rms. If not, common 60Hz noise
may convert as audible noise on the line.
Verify that the longitudinal balance is greater than
60dB.
Verify that the Power Noise measured on the line
is lower than 80dBrnc
Verify that the Circuit Noise measured on the line
is lower than 20dBrnc
Verify that the BRX-XLR chassis grounding is
properly made. Bad grounding may reduce unit
shielding efficiency and translate into higher
noise coupling.
If the measurements for the copper pair do not match
the above guidelines, please follow the corporate
procedure to rectify the situation and verify again if
the problem is still present.
Table 10: BRX-XLR Troubleshooting
