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P31003-H3560-S403-54-7620, 09/05
HiPath 3000 V6.0, HiPath 5000 V6.0, Provisional Service Manual
3-369
Boards for HiPath 3000
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3.4.13 REAL
Functions
The tasks of the REAL (S30807-Q5913-X) board in HiPath 3750 and HiPath 3700 are divided
into two functional areas (see Figure 3-165):
●
Relay ( RE AL)
Four individual, controllable relays (K1 to K4) are available for special connections. The re-
lays are energized by the CBCPR board via the REAL socket X05 connection cable. The
switch contacts for all relays are floating and protected by surge protectors.
In addition, a - 48-V line fused using a PTC resistor is routed to MDFU/MDFU-E and can
be used there for external applications (max. 80 mA).
- 48-V lines are provided at pins 17 and 37 (SU connector X06) for external applications
with higher power requirements. These lines have a load capacity of max. 15 W.
●
Power Failure Transfer ALUM (RE AL )
This function is provided by two relays (K5, K6) with two switch contacts each. In the event
of a power failure or a system restart or reload, an analog trunk is transferred from the sys-
tem to an analog telephone. The system monitors the line’s loop current to avoid discon-
necting any trunk calls in progress when the power is restored.
In normal mode, the relays are activated:
– The trunk is connected to the line trunk module.
– The subscriber line is connected to the subscriber line module.
In the event of a power failure or during a restart or reload (low potential of trunk failure
transfer signal from CBCPR), the relays are deactivated giving rise to the following situa-
tion:
– The signals to the line trunk module and subscriber line module are split and the trunk
is connected directly to the subscriber line.
If the power supply voltage returns after an interruption and a trunk call is in progress, ac-
tivation of the trunk failure transfer relay is prevented (by optocoupler).