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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-6
Cable Type
DCE
DTE
The cable type and part number are printed on a plastic band located near the smaller connector.
Note
Table B-7
Signal
RTS
DTR
CTS
DSR
DCD
GND
B_LL
GND
TxD+
TxD–
RxD+
RxD–
TXCE
TXCE
RxC+
RxC–
TxC+
TxC–
Cisco MGX 8230 Edge Concentrator Installation and Configuration
B-4
Table
B-9.
12IN1-S4 cable types
X.21
X.21 DCE
X.21 DTE
V.35 signals
Name
Request to Send
Data Terminal Ready
Clear To Send
Data Set Ready
Data Carrier Detect
Ground
Local Loopback
Ground
Transmit Data
Transmit Data
Receive Data
Receive Data
Secondary Clear to Send
Secondary Clear to Send
Receive Clock
Receive Clock
Transmit Clock
Transmit Clock
V.35
V.35 DCE
V.35 DTE
Source
DTE
DTE
DCE
DCE
DCE
both
DTE
both
DTE
DTE
DCE
DCE
DTE
DTE
DCE
DCE
DCE
DCE
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
Appendix B
Cable Specifications
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