3Com 3C63311 Reference Guide - Page 34

22 CHAPTER 1: SYSTEM DESCRIPTION Table 5 PathBuilder S310 System Specifications Connector type at end of EIA530 cable Connector pinouts Connector type at end of X.21 cable X.21 DTE cable pinouts (60-pin connector) to DB-15 male (continued) DB-25 subminiature, female for DCE, male for DTE A Side B Side Chassis Ground 1 Send Data 2 14 Send Timing 15 12 Receive Data 3 16 Req to Send 4 19 Receive Timing 17 9 Clear to Send 5 13 Terminal Ready 20 23 Receiver Ready 8 10 Terminal Timing 24 11 Signal Ground 7 DB-15 subminiature, female for DCE, male for DTE Signal Name Pin # on 60-pin Pin # on Direction (for DB-15 serial port) Frame GND 46 1 Circuit GND 15 8 RTS 9,10 3,10 OUT CTS 1,2 5,12 IN DSR IN DCD (not used; tristate when in DTE mode) DTR OUT LL (not used) OUT SD+ 11 2 OUT SD- 12 9 OUT RD+ 28 4 IN RD- 27 11 IN SCTE+ OUT SCTE- OUT SCR+ 26 6 IN SCR- 25 13 IN SCT+ IN SCT- IN Shorting GR 1 47,48,49 Shorting GR 2 51, 52