Cisco Systems MGX 8230 12IN1-S4 V.35/X.21 Back Card

B-4
Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
AppendixB Cable Specifications
Frame Relay Cabling
12IN1-S4 V.35/X.21 Back Card
The back card for the MGX-FRSM-HS1 /B is the 12IN1-S4. Each port on the back card co nnects through
a DTE version or DCE version of the Cisco 12IN1 cable . For the signals on the ba ck card, see Table B-7
and Table B-8. The tables show the signal acronym, si gnal name, and signal source. The sign al depends
whether the backcard connecto r is e it he r DT E o r D CE an d w he th er th e ba ck car d ha s b een se t a s either
X.21 or V.35 as shown in Table B-6. For the part numbers of the standard and non-standard versions of
the 12IN1 cables, see Tab le B-9 .
Note The cable type and part number are p rin ted o n a p la stic band located near the smalle r connector.
TableB-6 12IN1-S4 cable types
Cable Type X.21 V.35
DCE X.21 DCE V.35 DCE
DTE X.21 DTE V.35 DTE
TableB-7 V.35 signals
Signal Name Source
RTS Request to Send DTE
DTR Data Terminal Ready DTE
CTS Clear To Send DCE
DSR Data Set Ready DCE
DCD Data Carrier Detect DCE
GND Ground both
B_LL Local Loopback DTE
GND Ground both
TxD+ Transmit Data DTE
TxD–Transmit Data DTE
RxD+ Receive Data DCE
RxD–Receive Data DCE
TXCE Secondary Clear to Send DTE
TXCE Secondary Clear to Send DTE
RxC+ Receive Clock DCE
RxC–Receive Clock DCE
TxC+ Transmit Clock DCE
TxC–Transm it Clo ck DCE