Specifications

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 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

RxC+ Receive Clock DCE

RxC– Receive Clock DCE

TxC+ Transmit Clock DCE

TxC– Transmit Clock DCE