AT&T Merlin 820 Service And Maintenance Manual page 47

Trouble on One Voice Terminal
See if there are one or more terminal extension cords between the control
Step 8.
unit and the modular terminal cord of the voice terminal on which the
trouble appears.
Note: A modular terminal cord, with a 451A Adapter connected to one
end, is the equivalent of a terminal extension cord in this step and
in the following steps.
IF
There is one or more than one ter-
minal extension cord(s),
There is not a terminal extension
cord,
Switch the terminal extension cord of the voice terminal on which the
Step 9.
trouble appears and the terminal extension cord of the voice terminal with
no trouble (see Figure 17). The terminal extension cord(s) may be con-
nected directly to the control unit or to a jack panel. The dotted line in
Figure 17 shows the terminal extension cord(s) connected directly to the
control unit.
CONTROL UNIT
Figure 17—Switching Voice Terminal Extension Cords
Page 44
Go on to Step 9.
Skip to Step 11.
D8AF TERMINAL
EXTENSION
CORDS
JACK PANEL
THEN
VOICE TERMINAL
(WITHOUT TROUBLE)
D8W MODULAR
TERMINAL
CORD
D8W MODULAR
TERMINAL
CORD
D8AF TERMINAL
EXTENSION
CORDS
VOICE TERMINAL
(WITH TROUBLE)