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COMSPHERE DualFlow Data Service Units
3-12 December 1996 3615-A2-GB20-20
Verifying Network Addresses, the Network,
and DBM Operation
Establish a backup connection and perform a Digital
T
est over the backup connection to ensure that the
switched network is functioning. Access the DSU’
s
identity (ID) subbranch
for the tributary DSU
to ensure
that the DSU is properly addressed.
Verify that no alarms appear in the Device Health and
Status subbranches. Refer to the
V
erifying Operation and
T
esting Connections
section of Chapter 2 for procedures
that lead you through each of these procedures.
Other Tests
The
following lists the tests available on your DSU.
Refer to the T
est Branch
section of Chapter 4 for further
test information, as well as more detail on how to
configure and operate the DSU. Refer to Appendix A to
determine how best to access each test.
•
Device T
est (Devic)
•
Local Loopback
(LL) – DSU only
•
DTE Loopback
(DTE)
• Digital Loopback (DL)
• Remote Digital Loopback (RL) – DBM only
• Bilateral Loopback
• Digital T
est
(DT) – DBM only
• End-to-End Test (EE) – DBM only
•
Bit Err
or Rate T
est (BERT)
•
Lamp T
est (Lamp)