DETEWE opencom 100, Mounting And Commissioning Manual, Page: 26 / 136

24
Port Assignment, Termination, Cable Lengths Installation
The S
0
bus is terminated at one end by
the OpenCom 100 ; the hook switch is
closed.
IAE = ISDN socket (German: “ISDN An-
schluß Einheit”) or an ISDN terminal.
TR = terminating resistor, the S
0
ter-
mination. The TR must be at the ter-
mination of the line. This can also be
done by an appropriately wired IAE.
The S
0
bus is terminated by the TR at
the ends; the hook switch is open.
Termination on an ISDN socket
U
pn
Ports
Each of the U
pn
ports enable the
connection of an RFP 21/23 DECT
base station or an OpenPhone 61, 63
or 65 telephone using a twin-wire
cable.
The maximum permissible length of
the twin-wire cable on a U
pn
port of
an interface card is 1,000 m when
0.6 mm cable (with twisted pairs) is
used. The power consumption of
each U
pn
port is approx. 3 W.
Pin assignment of the S
0
and
U
pn
ports
a/b Ports
The a/b ports are for operating ana-
logue devices (a fax machine, mo-
dem or telephone). The maximum
permissible length of the cable is
1,000 m when twin-wire 0.6 mm ca-
ble (with twisted pairs) is used.
If an entrance intercom system is
connected to a/b1, the switch
marked “E” on the diagram
Positions
OpenCom 110
OpenCom 120
R
IAE IAE
TR
OpenCom 110
OpenCom 120
R
IAE
TR TR
IAE
1a
1b
2a
2b
TR
TR
S
0
int
2a 2b 1a 1b
1 2 3 4 5 6 7 8
RFP with 2 U
pn
1 2 3 4 5 6 7 8
U
pn
/RFP with 1 U
pn
1 2 3 4 5 6 7 8