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Tests
T1 Remote Test with Self-Test
Remote Test with Self-Test isolates the local DSU from the DTE and checks the DSU internal
circuits, the T1 link, and the remote DSU. The test procedure involves two functions:
•
Remote Test — the local DSU transmits an in-band command to its remote DSU, directing the
remote to loop received signals back onto the network. The DSU sends (and accepts) loopback
activation and de-activation codes as defined by ANSI T1.403.
•
Self-Test — the DSU enables its configurable internal Test Pattern Generator to provide the
signal for the Remote Loop and enables its Test Pattern Checker to verify the signal. The DSU
is isolated from its DTE while the Test Pattern Generator and Checker are enabled.
The Remote Test with Self-Test function can be commanded by means of the terminal interface or
by SNMP control.
TPG
DTE
Inter-
face
TPC
TPG = Test Pattern Generator
TPC = Test Pattern Checker
Figure 4-7
Remote
Device
HELLO
Figure 4-8
076R155-000
Issue 7
SC 553 DSU
TX
Driver
Framer
Network
Analog
Receiver
T1 Remote Test with Self-Test, Network Interface
Cascade Interface
Analog
Receiver
Framer
TX
Driver
DTE
Interface
T1 Remote Test with Self Test, Cascade Interface
SpectraComm 553 Fractional T1 DSU
Installation and Operation Manual
Remote DSU
Analog
Receiver
Framer
TX
Driver
SC 553 DSU
TPC
Network Interface
TX
Driver
Framer
TPC
Analog
Receiver
TPG = Test Pattern Generator
TPC = Test Pattern Checker
T1 Tests
DTE
Inter-
face
4-7
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