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B-4
Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
Appendix B 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 connects through
a DTE version or DCE version of the Cisco 12IN1 cable. For the signals on the back card, see Table B-7
and Table B-8. The tables show the signal acronym, signal name, and signal source. The signal depends
whether the backcard connector is either DTE or DCE and whether the backcard has been set as 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
Table B-9
.
Note
The cable type and part number are printed on a plastic band located near the smaller connector.
Table B-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
Table B-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–
Transmit Clock
DCE