Paradyne COMSPHERE
3610, Operator'S Manual

Page: 106 / 310

COMSPHERE 3600 Series Data Service Units
4-26 July 1999 3610-A2-GB91-90
Table 4-7
End-to-End Test Results
Results Reported By
1
Information Displayed
Time: Local and Remote
DSU/DBM Running test timer. (The Clr selection resets the timer to
0:00:00.)
Tot Block: Local and Remote
DSU/DBM Number of blocks completed. (The Clr selection resets the
counter to 0.)
Rx Blk err: Local and Remote
DSU/DBM Number of incoming blocks with errors detected, indicating a
fault in the incoming transmission path. (The Clr selection resets
the counter to 0.)
Tx Blk err: Local and Remote
DSU/DBM 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.)
Rx TimOuts: Local DSU/DBM only Number of blocks that were not received or acknowledged by
the remote DSU or DBM. (The Clr selection resets the counter
to 0.)
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 B ).
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.
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
F1
DSU BERT:
Start
Displ Clr
F2 F3
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 key
twice. To display the results of the test, press F1 to select