Specifications

Serial Cable Assemblies and Pinouts
WPIM-SY LOCAL MANAGEMENT GUIDE A-5
A.1.4 X.21
Table A-8 provides connector descriptions and Table A-9 provides pinouts for the
X.21 interface cable.
Table A-8. X.21 Interface
Cabletron interface cable part number 9380123
Description EIA-530A ALT A to X.21
Connector 1 Sub DB 26 pin male connector
Connector 2 DB 15 pin male connector
Table A-9. Cable Pinout for X.21
CONNECTOR 1
EIA-530A ALT A
P
A
I
R
CONNECTOR 2
CCITT X.21
MNEMONIC Dir to NAME Pin # Pin # NAME Dir to MNEMONIC
BA DCE Transmit Data A 2 A 2 Transmit A DCE T
BA DCE Transmit Data B 14 9 Transmit B DCE T
BB DTE Receive Data A 3 B 4 Receive A DTE R
BB DTE Receive Data B 16 11 Receive B DTE R
CB DTE Clear to Send A 5 C 5 Indication A DTE I
CB DTE Clear to Send B 13 12 Indication B DTE I
CA DCE Request to Send A 4 D 3 Control A DCE C
CA DCE Request to Send B 19 10 Control B DCE C
DB DTE Transmit Signal Timing A
Receive Signal Timing A
17,
15
E 6 Signal Element Timing A DTE S
DB DTE Transmit Signal Timing B
Receive Signal Timing B
9,
12
13 Signal Element Timing B DTE S
- SHIELD 1 DRAIN
AC DTE Common 7 8 Signal Ground G
AB DCE Common 23 8 Signal Ground G