Position
RJ-11C Direction* Description Product marking  
PSTN
a Not Connected
b Not Connected
c In/Out PSTN Transmit/ Receive
d In/Out PSTN Transmit/ Receive
e Not Connected 
f Not Connected
Position
Screw  
terminal* Direction* Description
Not Connected Data Carrier Direct (DCD)
No. 2 Out Received Data (RD)
No. 1 In Transmitted Data (TD)
No. 3 In Data Terminal Ready (DTR)
No. 5 – Signal Ground (SG) 
No. 4 Out Data Set Ready (DSR)
10 6619-2202
Position
D-sub Direction* Description D-sub  
description
No. 1 Out Data Carrier Direct (DCD)
No. 2 Out Received Data (RD)
No. 3 In Transmitted Data (TD)
No. 4 In Data Terminal Ready (DTR)
No. 5 – Signal Ground (SG) 
No. 6 Out Data Set Ready (DSR)
No. 7 In Request To Send (RTS)
No. 8 Out Clear To Send (CTS)
No. 9 Out Ring Indicator (RI)
RS-232 (DCE)
1
2
3
4
5
6
7
8
9
Power LV
LED Indicators  
(for details see 
next page)
PSTN
* Direction relative this unit.
Position Direction* Description Product marking
No. 1 In –Voltage
No. 2 In +Voltage