DETEWE OpenCom 130, User Manual

Page: 50 / 204

Installation Port Assignment, Termination, Cable Lengths
48
The maximum permissible length of the twin-wire cable on a U
pn
port is 500 m.
This line may only be laid inside buildings.
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 (these
interface cards are available for an OpenCom 130/150).
The power consumption of each U
pn
port is approx. 3 W.
Pin assignment of the S
0
and U
pn
ports
3.10.3 a/b Ports
The a/b ports are for operating analogue devices (e.g. a fax machine, modem or
telephone). The maximum permissible length of the cable is 1,000 m when twin-
wire 0.6 mm cable (with twisted pairs) is used.
Doorstation equipment can be activated on an a/b1 port (OpenCom 130,
OpenCom 131). In this case, an electronic switch enables the low-frequency
voltage to be separated from the feed.
Tip: It is possible to operate analogue trunk lines with an additio-
nal interface card. Further explanations regarding this inter-
face card can be found in the “M100-AT4 Interface Card” ma-
nual.
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