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The CCITT V.24 interface standard is equivalent to the RS-232C
standard; therefore, the descriptions of the EIA standards also
apply to the CCITT standards.
The following is an illustration of data terminal equipment
connected to an external modem using connections defined by the
RS-232C interface standard:
Data
Terminal
Equipment
Communications
Line
~"",'-----
~~~
"
-
"
Adapter
",,,," Cable Conforming
"
,,'"
To RS·232C Standards
'
~~/
'"
til
EIA/CCITT
Telephone Co.
' "
f - - - - ( '
Line Number
Lead Number
r-----'..,
Protective Ground
0-
AA/101
Signal Ground
0-
AB/1 02
Transmitted Data
BAl103
0
Received Data
0-
BB/104
Request to Send
0-
CAl105
Clear to Send
0-
CB/106
Data Set Ready
®-
CC/107
Data
Data Terminal Ready
@-
CD/10S.2
Modem
Equip
Connect Data Set to Line
------@--
**/10S.1
ment
Received Line Signal Detector
8
CF/109
Terminal
Speed Select - - - - - - - {
CH/111
Transmit Signal Element
Timlng~
DB/114
Receive Signal Element Timing
&
00/115
Select Standby
@-**/116
Ring Indicator
@--
DE/125
Test
~
**/***
I
External Modem Cable Connector
1312111098
7 6 5 4
3 2 1
\ 0 0 0 0 0 0 0 0 0 0 00
OJ
\ 0 0 0 0 0 0 0 0 0 0 0 0
252423222120191817161514
(MOdemIOCE
L ___
oat~
Terminal . _ _ _
+
Data Communications--1
I
Equlpmeht
E q U i P m e n t - I
Pin Number
*Not used when business machine clocking is used.
**Not standardized by EIA (Electronics Industry Association).
***Not standardized by CCITT
8-4
Communications
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