Cable Specifications C-21
Synchronous Serial Cable Assemblies and Pinouts
X.21
Figure C-10 shows the X.21 cable assembly. Table C-13 lists the DTE pinouts. Table C-14
lists the DCE pinouts. Arrows indicate signal direction: —> indicates DTE to DCE, and
<— indicates DCE to DTE.
Figure C-10
X.21 Cable Assembly
Table C-13
X.21 DTE Cable Pinouts (DB-60 to DB-15)
60 Pin
Signal
Description
Direction
15 Pin
Signal
J1-48
J1-47
GND
MODE_2
Shorting group
–
–
–
J1-51
J1-52
GND
MODE_DCE
Shorting group
–
–
–
J1-46
Shield_GND
Single
–
J2-1
Shield GND
J1-11
J1-12
TxD/RxD+
TxD/RxD–
Twisted pair no. 3
—>
—>
J2-2
J2-9
T
Transmit–
H1974
60-pin connector (J1)
15-pin connector (J2)
Connectors are not to scale
J2-8
J2-15
J2-9
J2-1
J1-46
J1-45
J1-16
J1-15
J1-1
J1-30
J1-31
J1-60
Summary of Contents for 2501 - Router - EN
Page 4: ...xviii Router Installation and Configuration Guide Conventions ...
Page 14: ...1 10 Router Installation and Configuration Guide Ordering Documentation ...
Page 32: ...2 18 Router Installation and Configuration Guide Where to Go Next ...
Page 78: ...4 24 Router Installation and Configuration Guide Getting More Information ...
Page 84: ...A 6 Router Installation and Configuration Guide Reading the LEDs ...
Page 108: ...C 24 Router Installation and Configuration Guide ISDN BRI Port and Cable Pinouts ...