I-DSL64 USER’S MANUAL
27
4.6
2047 BERT
There is one built-in 2047 BERT test pattern generator and receiver in each DTE port
of the
I-DSL64
. You can easily use the testing mechanism and other loopback
functions to check the status of system itself, the DSL and the remote equipment
(Figure 11,12,13).
Note: The 2047 BERT function is not available under the following conditions.
z
Time slot you wish to use occupied by Digital Loopback test.
z
Time slot you wish to use occupied by CSU loopback test initiated from remote
site.
z
DTE port you wish to use occupied by DSU loopback test initiated from remote
site.
When 2047 BERT function is activated, the BERT LED is turned on, the assigned DTE
port off and the timer activated. Users may check the RUN TIME and BIT ERR
results on the LCD.
z
RUN TIME: The elapsed time with range from 0 to 65535 seconds. If results are
out of this range, a ”+” sign appears to the left of the digits.
z
BIT ERR: The error bit count with range from 0 to 65535 bits. If results are out of
this range, a ”+” sign appears to the left of the digits. For each bit error, the
counter will add one and the ERR LED will blink. If the bit errors are too
numerous to synchronize the 2047 BERT pattern, or there is no data input, the
BIT ERR will display “NO SYNC” and the bit error counter will stop counting.
Figure 11 Local Loopback & 2047 BERT
TD
RD
DTE
Local Site
NTU-128
TD
RD
DTE
Line Interface
Digital Interface
Remote Site
NTU-128
Local
Loopback
&
2047 BERT
2047 GEN
2047 RCV
I-DSL64
I-DSL64
