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LED
X.21
Applique
Fourteen
X.21
front
Figure
The mnemonics
Thble
RxD
RxC
TxD
DCE CLK
BDSR
CONTROL
INDICATE
BCTS
LOOP
5V
12V
-12V
OK
DCE
Indicators
LEDs
which
are positioned
synchronous
interface
serial
of
the
applique
B46
LED
X.21
Applique
and
description
B-9
LED
X.21
Applique
Red
Red
Red
Red
Red
Red
Red
Red
Red
Green
Green
Green
Green
Red
B16
shown
in Figure
as
LEDs
viewed
are
listed
as
Indicators
LED
each
shown
for
are
Functions
Indicator
To
Receive
Data
To
Receive
Clock
From
Transmit Data
From
Clock
Internal
in
To
Data
Set
Ready
From
Send
Request
to
To
Indicate
Send
To
Clear
to
Loopback
5V
present
12V
present
-12V
present
Test
Okay
Applique
DCE
Mode
indicate
the
of
status
when
to
left
right
facing
B-9
in Table
chassis
chassis
chassis
chassis
DCE
mode
chassis
chassis
chassis
chassis
LED
Reading
Indicators
the
the
B-iS
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