Tests
T1 Tests
076R155-000
SpectraComm 553 Fractional T1 DSU
4-5
Issue 7
Installation and Operation Manual
T1 Tests
When the optional Cascade Port interface is installed you have the choice of running T1 and DS0
diagnostics through either the Network interface or the Cascade interface. Channel diagnostics
employ whichever T1 interface the channel data is routed through by the Channel Configuration.
T1 Self Test (End-to-End)
T1 Self Test turns on the T1-level test pattern generator and checker in the DSU. The test can be
initiated from the terminal interface or by SNMP control. Use of this test requires coordination with
the remote site, either to establish a loopback or to activate a test pattern generator and checker
(using the same pattern) for an end-to-end test.
The illustrations show Self Test in use as an End-to-End Test. When coordinating this test with a
remote site, make sure that the same test pattern is selected in both units.
Figure 4-3
T1 End-to-End Self Test, Network Interface
Figure 4-4
T1 End-to-End Self Test, Cascade Interface
SC 553 DSU
Remote DSU
DTE
Inter-
face
TPG
TPC
Framer
TX
Driver
Analog
Receiver
Network
Analog
Receiver
TX
Driver
Framer
DTE
Inter-
face
TPC
TPG
TPG = Test Pattern Generator
TPC = Test Pattern Checker
TPC
TPC
TX
Driver
Analog
Receiver
Framer
DTE
Interface
TPC
TPC
Framer
TX
Driver
Analog
Receiver
TPG = Test Pattern Generator
TPC = Test Pattern Checker
SC 553 DSU
Network Interface
Cascade Interface
Remote
Device