IC-4BRV Hardware Description
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Figure 5-4: Three Ports are connected to the PBX and one Port to the ISDN Network
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Two ports (0, 1) are connected to the PBX and two ports (2, 3) to the ISDN network. In this
case, both local breakout ports (four B-Channels) can be used to route calls to the ISDN
network. Only Port 1 is protected by the bypass relay.
Figure 5-5: Two Ports are connected to the PBX and two Ports to the ISDN Network
5.8
S-Bus Line Power
Some ISDN terminals are powered through the S-Bus. This is usually the case for ISDN phones but
not for PBXs. If you want to connect such a terminal directly to a port of the IC-4BRV, you must
install a PM-48V-int (or PM-38V-int) power supply module. Two steps are required to provide S-Bus
line power:
Hardware Installation Guide, Revision 3.11
