Proximus forum 523, Mounting And Commissioning Manual

Page: 49 / 228

Port Assignment, Termination, Cable Length
Installation 47
Connecting to the network (NTBA)
You can connect up to 8 terminals (ISDN telephones, ISDN fax machines, ISDN
base stations and ISDN terminals, ISDN cards for PCs etc.) to each internal S
0
bus. The power for three of these terminals can be supplied by the bus. Where
more devices are used, they will need their own power supply. The length of
the four-wire cable of an internal S
0
bus must not exceed 130 m. Each
internal S
0
bus has a capacity of about 3 W. The internal S
0
buses enable
point-to-multi-point calls using the DSS1 protocol (Euro ISDN).
To connect an ISDN telephone, connect a pressure terminal connection to an
IAE socket. For the following example, activate the
Telephony : Ports : S0 (#) :
Line termination option in the Configurator . In the IAE socket, 100 ohms
terminating resistors between 1a and 1b as well as between 2a and 2b are
required.
Connecting an IAE socket
NTBA
S01 external S02 external
Socket with 100 ohm termination impedance
Port S
0
intern
ISDN terminal
1a 1b 2a 2b
2a 2b 1a 1b
cable: max. 500 m