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Installing the gateway router 27
SmartNode 4552 & 4562 Getting Started Guide 3 • SmartNode installation
External S-Bus power supply
Many ISDN telephone handsets require that 40-VDC power be supplied via the S-Bus connection. In other
words, they have no separate or built-in power supply. In general, point-to-multipoint ISDN BRI network ter-
minations supply line power to the S-Bus. Point-to-point configurations connected to a PBX generally do not
supply line power.
The Model 4552 does not supply S-Bus line power on the BRI ports, however, there are two options to provide
S-Bus line power:
• If one of the BRI ports is connected to an ISDN NT, the power supplied by the NT is fed through to the
other BRI port.
• If line power is not available from the NT, but required for connected terminals, the PM-BRI-EXT S-Bus
Phantom power supply can be used.
Table 5. PM-BRI-EXT S-Bus 40V power supply
Item Phantom Power Supply; PM-BRI-EXT
Voltage Specifications Input 230VAC, Output 40VDC
If you use a Phantom power supply other than that supplied by
Patton Electronics Co., you must ensure that it conforms to ITU
I.430 Section 9.7.3.2.2. which specifies that the maximum cur-
rent delivered shall not exceed 200mA.
The PM-BRI-EXT power supply unit is equipped with a transformer
that is specially designed for S-Bus line power. The use of a general
purpose DC power transformer may cause equipment damage.
Do not plug the Phantom power supply directly into any other port
than BRI 0/0. Installing it on the Ethernet ports could result in serious
equipment damage.
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