Westermo MR Series - Manual (Page 432)

432 6622-3201
Web Interface and Command Line Reference Guide www.westermo.com
X.21 25-Pin to 15-Pin Crossover Cable – Internal Clock 21.1.4
This is normally the cable to use to connect the Westermo to an X.21 leased line. Use this cable
when the Westermo is the clock source or configured as “internal clock”.
25-way D - Westermo Side 15-way D
13
25 14
1 1
9 15
8
Signal Pin # (DCE) Pin # (DTE) Signal
Frame Ground (Case) Shield Shield Frame Ground (Case)
TxDA 2 4 RxDA
RxDA 3 2 TxDA
CTLA 4 5 INDA
INDA 5 3 CTLA
GND 7 8 GND
CLKB 9 13 CLKB
INDB 13 10 CTLB
TxDB 14 11 RxDB
RxDB 16 9 TxDB
CLKA 17 6 CLKA
CTLB 19 12 INDB
N.B. Frame Ground is optional.