Westermo MR Series - Manual (Page 430)

430 6622-3201
Web Interface and Command Line Reference Guide www.westermo.com
X.21 25-Pin to 15-Pin Straight Through Cable – Internal Clock 21.1.2
This is normally the cable to use to connect an X.21 terminal (e.g. an ATM) to the Westermo. 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 2 TxDA
RxDA 3 4 RxDA
CTLA 4 3 CTLA
INDA 5 5 INDA
GND 7 8 GND
CLKB 9 13 CLKB
INDB 13 12 INDB
TxDB 14 9 TxDB
RxDB 16 11 RxDB
CLKA 17 6 CLKA
CTLB 19 10 CTLB
N.B. Frame Ground is optional.