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INTERFACE CONVERSION CHARTS

(Standard Interfaces and Their Relationship to Each Other)

CCITT(ITU) V.35 Digital Interface (M34)

This interface provides balanced twisted-pair signaling for data and clock signals,
but provides unbalanced single-ended signaling for all other control terms.
 
PINNAMESIGNAL NAMECCITTDIRECTION
AFGFRAME GROUND101N/A
BSGSIGNAL GROUND102N/A
CRTSREQUEST TO SEND105TO MODEM
DCTSCLEAR TO SEND106FROM MODEM
EDSRDATA SET READY107FROM MODEM
FDCDDATA CARRIER DETECT109FROM MODEM
HDTRDATA TERMINAL READY108.1/108.2TO MODEM
JRIRING INDICATOR125FROM MODEM
K/MF1RESERVED FOR FUTURE INTERNATIONAL USE
L/NF2
R/TRXRECEIVE DATA104FROM MODEM
V/XSCRSERIAL CLOCK RECEIVE115FROM MODEM
Y/AASCTSERIAL CLOCK TRANSMIT114FROM MODEM
P/STXTRANSMIT DATA103TO MODEM
U/WSCTESERIAL CLOCK TRANSMIT EXTERNAL113TO MODEM
Z/BBF3RESERVED FOR FUTURE INTERNATIONAL USE
CC/EEF4
DD/FFF5
HH/KKN1RESERVED FOR FUTURE INTERNATIONAL USE
JJ/LLN2
MM/NNFRESERVED FOR FUTURE INTERNATIONAL USE

Note: Double letters may be indicated by corresponding lower case letters on the connector. 


EIA RS-530 DIGITAL INTERFACE (DB25) 

This interface provides balanced, twisted-pair signaling for all data and clock signals, and for most control item.
PINNAMESIGNAL NAMEEIADIRECTION
1FGFRAME GROUNDAAN/A
2/14TXTRANSMIT DATABATO MODEM
3/16RSRECEIVE DATABBFROM MODEM
4/19RTSREQUEST TO SENDCATO MODEM
5/13CTSCLEAR TO SENDCBFROM MODEM
6/22DSRDATA SET READYCCFROM MODEM
7SGSIGNAL GROUNDABN/A
8/10CDRX LINE SIGNAL DETECTORCFFROM MODEM
24/11SCTEEXTERNAL CLOCKDBTO MODEM
15/12SCTTRANSMIT CLOCKDBFROM MODEM
17/9SCRRECEIVE CLOCKDDFROM MODEM
20/23DTEDATA TERMINAL READYCFTO MODEM
18LLLOCAL LOOPBACKTO MODEM
21RLREMOTE LOOPBACKTO MODEM
25TMTEST MODEFROM MODEM

EIA RS-232C DIGITAL INTERFACE (DB25) 

This interface provides unbalanced, single-ended signaling for all data,
clock and control items.

PIN

NAME

SIGNAL NAME

EIA

CCITT

DIRECTION

1FGFRAME GROUNDAA101N/A
2TXTRANSMIT DATABA103TO MODEM
3RXRECEIVE DATABB104FROM MODEM
4RTSREQUEST TO SENDCA105TO MODEM
5CTSCLEAR TO SENDCB106FROM MODEM
6DSRDATA SET READYCC107FROM MODEM
7SGSIGNAL GROUNDAB102N/A
8DCDDATA CARRIER DETECTCF109FROM MODEM
9RESERVED FOR DATA SET TESTING   
10 RESERVED FOR DATA SET TESTING   
11 UNASSIGNED   
12(S)COSECONDARY CARRIER ONSCF122FROM MODEM
13(S)CTSSECONDARY CLEAR TO SENDSCB121FROM MODEM
14(S)TXSECONDARY TRANSMIT DATASBA118TO MODEM
15SCTSERIAL CLOCK TRANSMITDB114FROM MODEM
16(S)RXSECONDARY RECEIVE DATASBB119FROM MODEM
17SCRSERIAL CLOCK RECEIVEDD115FROM MODEM