Digital Link DL600E, Руководство пользователя, Страница: 108 / 147

6-6 DL600E E1 Data Multiplexer UserÕs Guide
Test Types
Self Test
The Self Test checks the systemÕs electronic components and performs a
signal path check of the transmit and receive directions utilizing a
simulated
4000
foot (1220 meter)
E1
line.
The test feeds a
QRW
test pattern to the transmitter circuit, passes it
through a simulated
E1
line back into the receiver, then feeds the test
pattern to the pattern detector circuit. When the code is successfully
detected, the
NET LED
turns on and the Power/Self Test
LED
turns
green. The
PWR/TEST LED
blinks yellow and then turns green when the
test is successful. If the test fails, the
LED
turns red for
ten
seconds and
then green.
The possible messages are
RUNNING SELF TEST
SELF TEST PASSED
<N>
Table 4-1 contains descriptions of self test error indicators.
You can also run the Self Test from the front panel. Refer to ÒUsing the
TEST MenuÓ in Chapter 5 for further information.
Loop DTE Test
The Loop DTE test veriÞes the operation of the DL600E unit and its
associated
DTE
cabling and equipment.
Table 4-1 Self Test Error
Indicators
Error indicators Description
0
ROM
Checksum test failed
1
RAM
test failed
2
EEPROM
Checksum test failed
3
DTE
test failed
4 Pattern test failed
5 Flash Proms Checksum test failed