Ericsson ZAT 19.2 Operation Manual page 288

Remote and local loopback with test pattern.
This test is used to check the local/remote modem and the line
between.
This test must be performed in data mode and only from the
SETUP menu from both modems simultaneously.
Example:
=Move cursor to (T+R) in TEST menu, data mode.
DATA: LEA/SW 96 SYNC/ASYNC
ooooo0 MENU
TEST. LINE DISC EXIT
ooooog LEAISW
SELECT TEST EXIT
L2 RL2 RL2+(T+R) _(F+#R)
=>Press the ROLL/EXEC switch to activate the test.
(T+R)
STATUS: NO ERRORS/XXX ERRORS
RESET: TERMINATE
=RESET. Reset to 0 number of bit errors.
=>TERMINATE test.
SELECT TEST EXIT
L2 RL2 RL2+(T+R) (T+R)
=> EXIT menu
TEST LINE DISC) EXIT. -
oo000g LEA/SW
=>EXIT menu
DATA: LEA/SW 96 SYNC/ASYNC
oounugaag MENU
14-18
Zat 14.4/14.4-7 and 19.2/19.2-7
LZTR104006 R1.00