COMSPHERE 3600 Series Data Service Units
3-12
December 1996
3610-A2-GB46-60
Digital Test
The Digital Test (DT) checks the functionality of a pair
of DSUs or DBMs and the data circuit between them.
The Digital Test uses the local DSU’s test pattern
generator. In a multipoint network where only a control
DSU can originate a Digital Test, tributary DSUs not
involved in the test are placed in Test mode for the
duration of the test.
Digital test is not available when:
•
In remote mode, or
•
Alternate Port 1 has NetIntf set to forced on (Forc)
with the DSU in Backup mode, or
•
LPDA-2 configuration option is enabled
The local DSU transmits the test pattern over the
network to the remote DSU, which is placed in Remote
Digital Loopback (RL); the user inputs the length of time.
During the test, the TXD, RXD, and RTS LEDs show
the states of the leads at the DTE interface. At the
conclusion of the test, the local DSU releases the remote
DSU from Digital Loopback.
To review the results of the DT test, press
↑
and select
Display (Displ). When using the front panel, press the
key to scroll through the results shown in Table 3-3.
The Clear (Clr) selection clears the test results and resets
the counter to zero.
Table 3-3
Digital Test Results
Results
Information Displayed
Time:
Running test timer.
Tot
Error:
Running count of bits in error. MAX appears
when the error count reaches about 65000.
Err
Secs:
Running count of errored seconds: An
errored second is at least one error detected
during a 1-second time period.
Run on:
port
nn
Port number appears if this test was not run
on an aggregate data path.
When the test is complete:
•
The top line display changes from Active to Final.
•
The second line changes from Please wait . . . to
either Command Complete or Command Failed.
End-to-End Test
The End-to-End (EE) test analyzes a control and a
tributary DSU or DBM and the network circuit between
them in both directions independently. Packets of data are
transmitted between DSUs or DBMs.
The test determines the direction of the data
transmission problem if the circuit is the cause. If an
End-to-End test is run, the in-band diagnostics are
disrupted. EE does not appear when in Remote mode.
To review the results of the EE test, press
↑
and select
Display (Displ). When using the front panel, press the
key to scroll through the results shown in Table 3-4.
The Clear (Clr) selection clears the test results and resets
the timer to zero.
Table 3-4
End-to-End Test Results
Results
Reported
By
*
Information Displayed
Time:
Local &
remote
DSU/DBM
Running test timer.
Tot Block:
Local &
remote
DSU/DBM
Number of blocks completed.
Rx Blk Err:
Local &
remote
DSU/DBM
Number of incoming blocks
with errors detected,
indicating an error in the
incoming transmission path.
Tx Blk Err:
Local &
remote
DSU/DBM
Number of blocks with errors
detected at the remote DSU,
indicating an error in the
outgoing transmission path.
Rx
TimOuts:
Local
DSU/DBM
only
Number of blocks that were
not received or acknowledged
by the remote DSU or DBM.
*
Local refers to the test initiator.
When the test is over:
•
The top line display changes from Active to Final.
•
The second line changes from Please wait . . . to
either Command Complete or Command Failed.
