Aria-130 Digital Key Telephone System
Issue: 1.2
Installation Manual
23
MB contains various kinds of connectors as in the Fig 2.4.3 Board Configuration of MB. There are six
universal slots in the MB(SLOT 1~6). Any kind of peripheral card can be installed in the universal slot.
RGU6 can be installed in the right bottom side of KSU through RGU connector on MB. PFTU is
connected to the PFTU connector on MB.
2.4.2 PSU (Power Supply Unit)
A Power Supply Unit, PSU, is supplied with KSU. The PSU converts commercial AC power (110 - 127 /
220 - 240V AC @ 48~63Hz) to DC voltages, regulates the voltages, and provides the appropriate DC
voltages to the back plane for distribution to other system components. Three DC outputs are provided :
±5V DC, +30V DC. A red LEDs in the KSU side panel indicate the presence of +30V DC.
The PSU includes circuitry to charge externally connected 24 volt batteries and controls operation of the
battery back-up circuits. And the PSU will provide system operating voltages from the batteries if
commercial AC power fails. In addition, battery back-up control circuitry is incorporated in the PSU to
disconnect the batteries prior to a deep discharge or over-charged.
2.4.3 RGU (Ring Generator Unit)
The Ring Generator Unit provides the ring voltage to the SLIB circuits to ring the SLT. Also the RGU
provides the input to the Message Wait source on the SLIB cards. The output of the RGU is 65V AC, 25
Hz. The RGU6 can support simultaneous ringing for 10 SLTs. The internal RGU is fitted on the lower right
side panel inside cabinet.
2.4.4 PFTU (Power Failure Transfer Unit)
The PFTU provides the relay contacts for transfer of 6 CO Lines to 6 SLTs in the event of a power or
processor failure. The PFTU is installed outside of the KSU and up to 5 PFTU modules can be connected
to the KSU with the cascade connection of control wire. The PFTU is equipped with a manual switch that
activates the Power Failure Transfer mode for testing purpose.
A 2-pin connector with screws is fitted for the control signal. And a RJ21 type male connector is fitted for
the connection between CO line, CO interface circuit, SLT interface circuit and SLT.
CON1
BD1
SW1
RL6
RL5
RL4
RL3
RL2
RL1
D1
Figure 2.4.4 PFTU Configuration
