Port Assignment, Termination, Cable Length
50
Installation
Tip:
If, for example, you have connected an IAE socket to an internal
S
0
port, and wish to switch the S
0
port to external operating
mode, you will need a crossover ISDN connection cable to
connect the IAE socket to an NTBA. The assignment of a
crossover connection cable is described in the chapter on
under the heading
U
pn
Ports
U
pn
ports enable you to connect the digital system telephones
Forum Phone 516/526/536 or Forum Phone 515/525/535 using a twin-
wire cable. You can also connect DECT base stations to a U
pn
port.
If you want to use cordless DECT handsets (e. g. Forum Free 565/575 or
Forum Free 567/577/587) you will need the DECT base station
Forum Base DECT. If the DECT base station is connected to a U
pn
port, four
calls can be made simultaneously using the handsets. If the base station is
connected to two U
pn
ports, eight calls can be made simultaneously. Please
note however, that you can only make as many simultaneous external
connections as there are externally-connected B channels available.
The length of a twin-wire cable for a U
pn
port on a U
pn
interface card may not
exceed a maximum of 1000 m, where a 0.6 mm cable (with twisted pairs) is
used. This cable may only be laid inside buildings.
Each U
pn
port has a power consumption of about 3 W.
Pin assignment of U
pn
ports
To connect a digital system telephone or DECT base station, connect the
pressure terminals to a UAE socket.
1 U
pn
8
RFP wit
1 2 3 4
Summary of Contents for forum 523
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