ONE100 Chapter 4
Installation Guide Interface Description
51
Straps
Every ISDN interface has a strap (ST13, ST14, ST15 ST16) making it possible to configure the following
options:
• 100 Ohms impedance adaptation
• Power-feeding for ISDN phones
Refer to 3.6 - The ONE100 Motherboard on page 42 for the position of these straps.
Description
All four straps allow:
• To connect a 100 Ohms impedance adaptation or not. The straps can be used in sending, in receiving
or in both sending and receiving direction. The 100 Ohm adaptation is required on a S-bus (connec-
tion to ISDN phones) with a distance above 50 meters. By default these jumpers are set.
• To connect the power supply for ISDN terminal (30 volts) or not. This is required for connection to
ISDN phones. Sometimes it is also required for connection to a PBX. By default, these straps are set.
Straps operate in pairs:
- No power feeding: both straps must be removed.
- With power feeding: both straps must be set.
The following figure illustrates the functions of the straps:
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