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Tests
TPG
DTE
Inter-
face
TPC
TPG = Test Pattern Generator
TPC = Test Pattern Checker
Figure 4-22
DS0 Loopback
A DS0 Loopback commands the DSU to loop one, selected DS0 back to the remote. The remote
site is responsible for test pattern generation and checking.
A DS0 Loopback can be initiated from the terminal interface or by SNMP control.
Figure 4-23
4-20
SC 553 DSU
TX
Driver
Framer
Network
Analog
Receiver
Local DSU transmits and monitors test pattern on
the selected DS0, and measures time required
for the round trip.
DS0 Circuit Delay Test
SC 553 DSU
DTE
Inter-
Framer
face
Only the selected DS0 is looped
DS0 Loopback
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
Remote DSU
Analog
Receiver
Framer
TX
Driver
TX
Driver
Network
Analog
Receiver
DS0 Tests
DTE
Inter-
face
076R155-000
Issue 7
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