X.21 Smart Serial Cable Assembly - Cisco MWR 1941-DC - 1941 Mobile Wireless Router Hardware Installation Manual

Smart Serial Connection Signals and Pinouts
Table B-20 EIA/TIA-449 DCE Smart Serial Cable Pinout (continued)
26-Pin Signal Name
J1-12
J1-25
J1-13
J1-26
J1-04
J1-17

X.21 Smart Serial Cable Assembly

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