Cisco MWR-1941-DC-2T1 Hardware Installation Guide - Page 94
X.21 Smart Serial Cable Assembly
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Smart Serial Connection Signals and Pinouts Appendix B Cable Specifications Table B-20 EIA/TIA-449 DCE Smart Serial Cable Pinout (continued) 26-Pin Signal Name Note J1-12 I_DTR/DSR+ Twisted pair no. 3 J1-25 I_DTR/DSR- J1-13 B_LL/LL+ J1-26 GND+ Twisted pair no. 12 J1-04 I_RXC/TXCE Twisted pair no. 6 J1-17 + I_RXC/TXCE- DB-37 Direction Pin
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B-28
Cisco MWR 1941-DC Mobile Wireless Edge Router Hardware Installation Guide
78-15827-06B0
Appendix B
Cable Specifications
Smart Serial Connection Signals and Pinouts
X.21 Smart Serial Cable Assembly
Table B-21
lists the DTE pinout and
Table B-22
lists the DCE pinout for the X.21 Smart Serial cable.
Arrows indicate signal direction: —> means DTE to DCE and <— means DCE to DTE.
J1-12
J1-25
I_DTR/DSR+
I_DTR/DSR–
Twisted pair no. 3
<—
<—
J2-12
J2-30
TR+
TR–
J1-13
J1-26
B_LL/LL+
GND+
Twisted pair no. 12
—>
—
J2-10
J2-37
LL
SC
J1-04
J1-17
I_RXC/TXCE
+
I_RXC/TXCE–
Twisted pair no. 6
<—
<—
J2-17
J2-35
TT+
TT–
Table B-20
EIA/TIA-449 DCE Smart Serial Cable Pinout (continued)
26-Pin
Signal Name
Note
Direction
DB-37
Pin
Signal
Name
Table B-21
X.21 DTE Smart Serial Cable Pinout
26-Pin
Signal Name
Note
Direction
DB-15
Pin
Signal Name
J1-21
J1-24
MODE_2
MODE_DCE
Local connections
Drain
wire
Shield
—
J2-01
Shield_GND
J1-05
J1-18
I_RXD/TXD+
I_RXD/TXD–
Twisted pair no. 8
<—
<—
J2-04
J2-11
RECEIVE+
RECEIVE–
J1-01
J1-14
O_TXD/RXD+
O_TXD/RXD–
Twisted pair no. 5
—>
—>
J2-03
J2-09
TRANSMIT+
TRANSMIT–
J1-11
J1-10
I_CTS/RTS+
I_DSR/DTR+
Twisted pair no. 2
<—
<—
J2-05
J2-12
INDICATION
+
INDICATION
–
J1-08
J1-09
O_RTS/CTS
O_DTR/DSR+
Twisted pair no. 3
—>
—>
J2-03
J2-10
CONTROL+
CONTROL–
J1-26
GND+
Not used
Twisted pair no. 1
—
J2-08
CCT GND
Not used
J1-04
J1-17
I_RXC/TXCE
+
I_RXC/TXCE–
Twisted pair no. 7
<—
<—
J2-06
J2-13
TIMING+
TIMING–
Not used
Twisted pair no. 4
Not used
Not used
Twisted pair no. 6
Not used
Not used
Twisted pair no. 9
Not used