Cabletron Systems Cabletron CyberSWITCH CSX400 - Manual (Page 244)

WPIM Cable Specifications
230 CSX400 and CSX400-DC User’s Guide
X.21
Table 44 shows the connector number, cable assembly description, and connector type.
Table 45 provides pin assignments for the X.21 interface cable.
Table 44 X.21 Interface
Connector Number Cable Assembly Description Connector Type
1
EIA-530A ALT A to X.21
Sub DB 26-pin male
2 DB-15 pin male
Table 45 X.21 Interface Cable Pin Assignment
Connector 1 EIA-530A ALT A
PAIR
Connector 2 X.21
MNEMONIC
DIRECT
TO
NAME PIN PIN NAME
DIRECT
TO
MNEMONIC
BA DCE
Transmit Data A 2
A
2 Transmit A
DCE T
Transmit Data B 14 9 Transmit B
BB DTE
Receive Data A 3
B
4 Receive A
DTE R
Receive Data B 16 11 Receive B
CB DTE
Clear to Send A 5
C
5 Indication A
DTE I
Clear to Send B 13 12 Indication B
CA DCE
Request to Send A 4
D
3 Control A
DCE C
Request to Send B 19 10 Control B
DB DTE
Transmit Signal Timing A
Receive Signal Timing A
17
15
E
6
Signal Element
Timing A
DTE S
Transmit Signal Timing B
Receive Signal Timing B
9
12
13
Signal Element
Timing B
SHIELD 1 DRAIN
AC DTE Common 7
8 Signal Ground G
AB DCE Common 23