Near End Tests; Dte Only Test; Figure 3-1. Dte Only Test Diagram - ADTRAN DSU 56/64 User Manual

Chapter 3. Test Modes
If an E
ALM, PTRN, and E
test.

NEAR END TESTS

The local DSU 56/64 can perform the following near end tests:
•
•
•
•

DTE ONLY TEST

The DTE O
56/64 plus its loop transmitter and receiver. For this test, the loop
transmit data is connected to the loop receive data at a point close
to the physical network interface.
The loopback point and the signal paths for this test are shown in
Figure 3-1.
DTE or Test
Equipment
Interface
TD
RD
3-2
C
PROM HECKSUM
RROR
DTE Only
DTE with Test Pattern
DTE and LOOP (LL)
Loop Only (RT)
test can test both the DTE interface of the local DSU
NLY
DTE
Transmit
Interface
DTE
Receive
Interface
DSU 56/64 User Manual
failure is detected during self test, CS,
indicators all flash at the end of the self
56/64 DSU
Loop
Transmit
Interface
DTE
Only
Loop
Receive
Interface

Figure 3-1. DTE Only Test Diagram

Network
Interface
Loop TX
Loop RX
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