Bit Error Rate Test; End-To-End Test Results - Paradyne COMSPHERE 3610 Operator's Manual

COMSPHERE 3600 Series Data Service Units
Results Reported By
Time: Local and Remote
DSU/DBM
Tot Block: Local and Remote
DSU/DBM
Rx Blk err: Local and Remote
DSU/DBM
Tx Blk err: Local and Remote
DSU/DBM
Rx TimOuts: Local DSU/DBM only
1
Local refers to the test initiator.

Bit Error Rate Test

The Bit Error Rate Test (BERT) is a session-
disruptive test used to analyze the network circuit. This
test requires network connection to the control and
tributary DSUs. A DTE connection to the remote DSU
may be required. The originating DSU sends a continuous
511-bit test pattern from its test pattern generator
(Figure 4-11), transmitting it via the DDS circuit for the
DSU test and via the dial circuit for the DBM test. It can
monitor the results in one of the following ways:
Putting the remote DSU into Digital Loopback and
checking the returned pattern for errors
(Figure 4-11, part A).
Simultaneously executing the BERT in the remote
DSU (Figure 4-11, part
If using external test equipment that transmits a
standard 511-bit pseudo-random test pattern, make sure
the DSU is configured for the standard 511 test pattern. If
the remote end is a 2500 or 2600 DSU, it will transmit an
inverted 511 test pattern. Make sure the 3600 Series DSU
is configured for the AT&T test pattern.
The test continues until aborted. This test can be run on
an aggregate or per-port basis. When run on an aggregate
basis, in-band secondary channel transport
communications are disrupted.
4-26
Table 4-7

End-to-End Test Results

1
Running test timer. (The Clr selection resets the timer to
0:00:00.)
Number of blocks completed. (The Clr selection resets the
counter to 0.)
Number of incoming blocks with errors detected, indicating a
fault in the incoming transmission path. (The Clr selection resets
the counter to 0.)
Number of blocks with errors detected at the remote DSU,
indicating a fault in the outgoing transmission path. (The Clr
selection resets the counter to 0.)
Number of blocks that were not received or acknowledged by
the remote DSU or DBM. (The Clr selection resets the counter
to 0.)
B).
Information Displayed
A control DSU can initiate a Bit Error Rate Test on a
point-to-point or multipoint network. A tributary DSU can
only initiate a BERT on a point-to-point network.
If nondisruptive diagnostics are in effect, the in-band
secondary channel transport communications are
disrupted. The Bit Error Rate Test is not available in
Bridge mode.
To access BERT from the top-level menu, make the
following selections:
Local (F1), or Remot (F2) and Address
Test
DSU (select active core)
BERT
DSU BERT:
Start
F1
If the BERT is already in progress, Start will not be
displayed. The Port Select screen appears.
To abort the Bit Error Rate Test, press the
twice. To display the results of the test, press F1 to select
July 1999
Displ Clr
F2 F3
key
3610-A2-GB91-90