Northern Telecom DMS-100 Series Installation And Maintenance Manual page 50

0 297-2121-226
0 VINTAGE 05.01
0 Local Loop:
0 This toggle switch, labeled Loc Loop, selects either normal oper-
0 ation or a local loopback (loop) test.
0 in the Loc
0 When the switch is in to Loc Loop position, the integrity of
0 DTE to DU
0 back data at the DB-25 DTE interface towards the DTE.
0 entered on the DTE keyboard are echoed on the DTE
0 Under Test
0 Loopback Tests (NT4X25AD /CH /AV /DF) on page 5-10.
0 3-30
Loop position, the DU is set for normal operation.
connection is checked.
LED lights during the test.
When this switch
When activated, the DU loops
screen.
For more details see
is not
the
Characters
The