Add-ons
15
System Telephones on the Forum 500 / Forum 5000
listening/hands-free volume of the second telephone. The feed
power can be increased by connecting an external AC adapter (2).
Note:
U
pn
adapters on the communications system can only be
operated on telephones directly connected to the system. A U
pn
adapter is not permitted on a second telephone.
a/b Adapter
Using an a/b adapter, you can connect analogue telephones to the
Forum Phone 520 and Forum Phone 530 system telephones.
Technical Data
z
Dialling mode: DTMF
z
CLIP is not supported on connected analogue telephones.
z
Charge impulses are not transmitted, and charges are
therefore not displayed on analogue telephones.
Notes on Connecting a/b Adapters
The connection of an a/b adapter exceeds the feed power of the
U
pn
port (3 W), regardless of the range. For this reason you also
have to connect a power supply to the a/b adapter.
Note:
Use the power supply with the part number 900 263 33!
You can connect
one
a/b adapter to a Forum Phone 520 or a
Forum phone 530.
You can connect one a/b adapter
and
one U
pn
adapter to a
Forum Phone 530. On the telephone connected via the U
pn
adapter, a Forum Phone 520 for example,
no
a/b adapter can be
operated.
If you combine an Forum Phone 530 via an a/b adapter and a U
pn
adapter with two other telephones (i.e. three telephones alto-
gether), you can make calls on a maximum of two of them
simultaneously.
CLIP = Calling Line Identification Presentation: Displays the tel-
ephone number of the caller.