DSU Operations
4-17
3610-A2-GB91-90
July 1999
Loopback
The Loopback (Lpbk) selection displays four loopback
tests:
•
Local Loopback (LL)
•
DTE Loopback (DTE)
•
Digital Loopback (DL)
•
Remote Digital Loopback (RL)
Local Loopback
Local Loopback (LL) is session-disruptive and permits
the DTE to run a test to determine whether the DTE
connection to the DSU and the DSU itself is functioning
properly. The DSU must be connected to the DTE. The
network connection to the DSU is not required.
Local Loopback is used with the DTE test after the
DSU passes a Device Test.
To access Local Loopback from the top-level menu,
make the following selections:
•
Local (F1)
•
Test
•
DSU
•
Lpbk
•
LL
While the DSU is in Local Loopback, any data
transmission by the DTE is returned as received data
(Figure 4-4). An operator can send a test pattern and
verify correct reception of the test. The DSU does not
monitor this testing.
NOTE
When a Local Loopback is
requested of an inactive core,
there is no effect since the data
from the DTE port is routed
through the active core.
F1
DSU Local Lpbk:
Command Complete
F2
F3
NOTE
When Nondisruptive Diagnostics
is enabled (Diag Type = NonD),
Local Loopback disrupts
secondary channel transport
communications. For a control
DSU, the DSU will report No
Response or Tributary Timeout
during the test.
Figure 4-4. Local Loopback
Содержание COMSPHERE 3610
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