Installation guide

Cabling Specifications A-63
Serial Cables
Table A-23 Low-Speed X.21 DCE Compact Octal Serial Cable Pinouts
Router End (200-Position Plug) Network End (15-Pin Connectors)
Pin Signal Note Direction Signal Pin
J8-75
J8-76
MODE_2
GROUND
Shorting
Group
–
SHIELD_GROUND Braid SHIELD GND J0-1
J8-5
J8-6
I_RXD/TXD+
I_RXD/TXD-
Twisted pair #1 <—
<—
TRANSMIT+
TRANSMIT-
J0-2
J0-9
J8-23
J8-24
I_CTS/RTS+
I_CTS/RTS-
Twisted pair #4 <—
<—
CONTROL+
CONTROL-
J0-3
J0-10
J8-1
J8-2
O_TXD/RXD+
O_TXD/RXD-
Twisted pair #2 —>
—>
RECEIVE+
RECEIVE-
J0-4
J0-11
J8-16
J8-17
O_RTS/CTS+
O_RTS/CTS-
Twisted pair #5 —>
—>
INDICATION+
INDICATION-
J0-5
J0-12
J8-3
J8-4
O_TXCE/RXC+
O_TXCE/RXC-
Twisted pair #3 —>
—>
TIMING+
TIMING-
J0-6
J0-13
J8-11
J8-18
SIG_GROUND
SIG_GROUND
Twisted pair #6 – SIG GND
SIG GND
J0-8
J0-8
– Not used
Not used
Twisted pair #7 – Not used
Not used
–
– Not used
Not used
Twisted pair #8 – Not used
Not used
–
– Not used
Not used
Twisted pair #9 – Not used
Not used
–
SHIELD_GROUND Braid SHIELD GND J1-1
J8-46
J8-45
I_RXD/TXD+
I_RXD/TXD-
Twisted pair #1 <—
<—
TRANSMIT+
TRANSMIT-
J1-2
J1-9