Telecommunications Techniques Corporation interceptor 147, Reference Manual, Page: 196 / 280

Applications
7-16
7
INTERCEPTOR 147 2 Mbit/s and Data Analyzer
3. Set the CONFIGURATION category items
Set Transmitter to OFF to conserve battery life.
Set Framing and Pattern to the framing and
pattern used by the transmitting test set.
4. Check AUXILIARY category items
If you are using a printer, set all printer-related
setup items as desired. (For more information,
see Section 5). Check the Time and Date items
to verify they are set for the current time and date.
5. Set RECEIVER control to TERM
TERM mode provides proper termination of the
T-BERD 305/310 2048 kbit/s output, and it
enables selection of 120
Ω
or 75
Ω
as appropriate
for compatibility with the 2048 kbit/s output
from the T-BERD 305/310.
Test Results
1. Check the error results
To analyze the performance of a 2048 kbit/s link
(while it is in-service), you can check the circuit’s
CRC-4 error results, frame (FAS and MFAS)
error results, or code error results. When available,
CRC-4 error results provide a good indication of
overall link performance. However, note that
Digital Cross-connect Systems and Automatic
Cross-connect Equipment (DCS/ACE) generally
are considered terminals (source/sink devices)
for 2048 kbit/s links. Thus, CRC-4 errors received
on one 2048 kbit/s link are not passed through to
other 2048 kbit/s links terminating on the same
DCS/ACE.
2. Check the STATUS & ALARMS LEDs
Verify proper detection of signal, framing, pattern,
and absence of alarms.
3. Check for timing problems
To check for timing problems, perform a bit slip/
frame slip test (See Section 7.8).