Version 2.0.0
11
Note:
The cable pair and group are twisted inside the cable. This means the pair may be on the top, bottom, or middle
as the probe is moved along the cable. It is normal for the signal indication to rise and fall wile monitoring the cable.
The fault location is determined by higher
average
signal peaks before the fault than after the fault for shorts and
crosses. The
average
peaks are higher after a split.
The
average signal
may also increase as a splice case is approached. This is due to the lack of sheath shielding at the
case and the separation of the pair groups during splicing.
The position of the pair in the inbound cable may be different than the outbound cable due to the change in position
of the pair in the two cables. Compare the
average
maximum signal before the splice and after the splice to confirm a
fault location.
6.
To verify the location when the fault is indicated, compare the
average
signal
peaks before and after the identified location.
a.
The signal should decrease significantly for shorts and crosses after the
fault.
b.
The signal should increase after the point where a pair splits. If moving
from the spit section to the un-split section, the signal will decrease.
See the picture in 6.2.1 above.
7
D
ETECTING
DSL
The SR-101 monitors a frequency or group of frequencies to determine signal level, and produces an audio
sound in the speaker to indicate digital data transmission.
7.1
F
REQUENCY
S
CAN
The DSL Frequency Mode scans the selected frequency range to indicate signal or noise level. The range is
selectable and displayed at the bottom of the graph. The graph vertical column on the left is the relative dB level
of the signal.
Cursor Mode can be selected and the scanning stops allowing the technician to select specific frequencies. The
frequency and dB level are shown at the top of the LCD graph. The received signal can be heard from the
speaker or a connected earphone.
Short or
Cross
Confirmed
