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a/b Ports
The a/b ports are for operating analogue devices (e. g. fax,
modem or analogue telephone). The maximum permissible length
of the cable is 1,000 m, where a twin-wire 0.6 mm cable (with
twisted wire pairs) is used. You can then use devices for voice or
data communication which use pulse dialling, or devices which use
pulse or DTMF dialling, including:
analogue telephones,
G3 fax machines,
analogue modems,
external devices for Music on Hold,
external mail systems.
If analogue telephones are to be used, connect the pressure ter-
minals to a standard telephone connection socket.
black wire
red wire
a/b port
Alternatively you can also use the
combination of wires white/yellow.
cable: max. 1000 m
Connection using a telephone connection socket
To connect an analogue device (fax, modem), connect the pres-
sure terminal to a connection socket for telecommunications
devices.
black wire
red wire
a/b port
Alternatively you can also use the
combination of wires white/yellow.
cable: max. 1000 m
Connecting a combined German standard telephone/NFN socket
Port Assignment, Termination, Cable Length
1 2 3 4 5
6
F
TAE-F socket
analogue phone
1 2 3 4 5
6
N
F
N
TAE-NFN socket
analogue phone
analogue fax machine
55
Installation
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