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Tests
Channel Digital Loop
A Channel Digital Loop commands the DSU to loop all the DS0s assigned to carry channel data
back to the remote. The remote site is responsible for test pattern generation and checking.
A Channel Digital Loop can be initiated from the terminal interface or by SNMP control.
Figure 4-18
Channel LL with Self Test
Channel Local Loop (LL) with Self Test commands the DSU to turn on its channel-level test pat-
tern generator and checker and to loop data back at the channel interface. Local Loopback with Self
Test checks the channel interface circuitry isolated from both the DTE and the rest of the DSU.
During this test the DSU clamps the channel data it transmits to the T1 link to marks.
Local Loop with Self Test can be commanded by means of the terminal interface or by SNMP
control.
Figure 4-19
076R155-000
Issue 7
SC 553 DSU
DTE
Inter-
Framer
face
Channel Digital Loop
TPG
DTE
Inter-
Framer
face
TPC
Channel Local Loop with Self Test
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
TX
Driver
Network
Analog
Receiver
SC 553 DSU
TX
Driver
Analog
Receiver
Channel Tests
4-17
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