Ericsson ZAT 19.2 Operation Manual page 277

14. Tests
14.7 Local analogue loopback with test pattern
The purpose of this test is to check the receive and transmit circuits
in the local modem. The modem will generate a varying bit-pattern
which will be modulated and demodulated. Numbers of errors will be
counted and displayed on the screen when the test is ended.
—_—_—__——__»
Preconditions :
Modem
Modulator —_,
The modem must be in command state (Eventually use +++).
Echo must be enabled (The E1 command ).
Test timer disabled - example 1:
= Enter:
ATS18=0& 18g"), .|$18=0 disconnects the Test Timer.
he &T8 Selects Local analogue loopback
with test pattern.
| The lest indicator lights.
AT&TOp*| me : The lest will be interrupted.
The modem answers 000 0 fault detected
OK Test terminated
Alternative 2:
The modem answers 007 7 faults detected
OK Test terminated
LZTR104006 R1.00
14-7
Zat 14.4/14.4-7 and 19.2/19.2-7