Распиновка, расположение выводов и внешний вид последовательного интерфейса:
ITU-TSS X.21
Common names: ITU-TSS (CCITT) X.21, ISO 4903
(at the DTE)
(at the DCE)
CORRECT?
15 PIN D-SUB MALE at the DTE (Computer).
15 PIN D-SUB FEMALE at the DCE (Modem).
PinNameDirDescriptionType
1
n/a
Shield
Ground
2
T (A)
Transmit (A)
Data
3
C (A)
Control (A)
Control
4
R (A)
Receive (A)
Data
5
I (A)
Indication (A)
Control
6
S (A)
Signal Timing (A)
Timing
7
B (A)
Byte Timing (A)
Timing
8
G
Ground
Ground
9
T (B)
Transmit (B)
Data
10
C (B)
Control (B)
Control
11
R (B)
Receive (B)
Data
12
I (B)
Indication (B)
Control
13
S (B)
Signal Timing (B)
Timing
14
B (B)
Byte Timing (B)
Timing
15
unused
Note: Direction is DTE (Computer) relative DCE (Modem).
Contributor:
Joakim Цgren
Source:
X.21 Page made-it.com/CKP/x21.html at Connectivity Knowledge Platform (Made IT)
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May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2002-01-13