4-2
TS1200 Test Set
Users Guide
If a problem with the PC can be ruled out, disconnect the modem from the wall jack, terminate
the line with the test set and run a modem emulation test. If the test set synchronizes with the
DSLAM, the customer’s ADSL modem may be defective. Connect another ADSL modem and try
to establish a connection.
If terminating the line with the test set fails to establish synchronization with the DSLAM (when
connected at the same point as the customer’s modem), try to isolate the failure between the
wall jack and the Network Interface Device (NID). If the test set synchronizes with the DSLAM
when connected at the NID, the inside wiring is the problem. Confirm the severity of the failure
with a test meter and run new wire to the wall jack, if necessary.
Poor bit rate performance may be caused by an excessive number or length of bridged taps in
the house. This is especially common with splitterless ADSL, which uses bridged taps for voice
service. The bit rate can be improved by shortening or reducing the number of bridged taps, or
by installing a permanent ADSL/POTS splitter, as shown in Figure 4-1. However, the bit rate
should first be verified at the NID and the ADSL jack to determine if the limitation is caused by
inside wiring or the outside plant loop conditions.
Table 4-1. Basic Troubleshooting Questions
Question
If No
If Yes
Is voice service still functioning
on the line?
The problem is probably limited
to the ADSL service.
The problem is on the line (i.e., an
open circuit).
Does the modem indicate
synchronization with the
DSLAM?
Isolate the failure using an
ADSL test set.
The problem is probably an
incorrect configuration on the PC,
or a failure in the ISP network.
Does the modem work
sporadically or only at certain
times of the day?
Isolate the failure using an
ADSL test set.
There may be periodic radio
frequency (RF) interference from
equipment or other high
frequency sources. Contact the
ADSL help desk and try
reconfiguring the line with better
noise margin (this may also
decrease the maximum
connection speed and effective
bit rate.
(External Modem only) Is the
modem correctly connected to
the PC and the power turned
on?
Reconnect the modem and turn
it on.
Isolate the failure using an ADSL
test set.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Содержание TS 1200
Страница 7: ...1 3 Contacting Fluke Networks...
Страница 8: ...1 4 TS1200 Test Set Users Guide...
Страница 27: ...2 19 Downloading Stored Results to a PC bdx03 ups Figure 2 3 Selecting and Downloading Stored Results...
Страница 28: ...2 20 TS1200 Test Set Users Guide...
Страница 42: ...4 4 TS1200 Test Set Users Guide bdx04 eps Figure 4 1 ADSL with and without a Splitter...
Страница 44: ...4 6 TS1200 Test Set Users Guide Visit us at www TestEquipmentDepot com...
