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X.21
The
specification
for either
set
Change
shown
order
ground
Figure
Table
Thble
10
11
12
13
14
15
AGS
A-8
Hardware
Installation
Applique
which
X.21
applique
designed
is
DTEVDE
for
DTE
DCE
mode
or
DCE
mode
the
to
by changing
in Figure
three
A-4.All
for the
to
applique
operate
when
in the
default
position
A-4
X.21
Applique
A-7
the
for the
pinout
lists
A-7
X.21
Applique
Pinout
Drain
Shield
TXD-a
Control
R-a
Indicate
RxC-a
DCE
clock
GROUND
TXD-b
Control
RxD
Indicate
RxC-b
DCE
clock
Not
used
and
Maintenance
domestic and
for
FCC
Class
and
Class
mode
with
default
as
the position
ofjumpersJlJ2
must be
in the
jumpers
J4 connects
Jumper
properly
shown
A-4
in Figure
DCE
with Jumpers
Set
for
X.21
applique
DTE
Mode
From
chassis
From
chassis
To
chassis
To
chassis
To
chassis
From
chassis
From
chassis
From
chassis
To
chassis
To
chassis
To
chassis
From
chassis
Not
used
international
use meets
the
CSA
C108.8
The
applique
DTE
shown
in Figure
andJ3
as
DCE
DTE
same
or
position
to
chassis
ground
logic
Operation
CCITT
can be
A-4
they
are
in
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