Motorola MSF 5000 Instruction Manual page 86

Chapter
1
Description
MSF
5000
Instruction Manual
Secure Board Functional Description
1-48
The
Secure board
provides two methods
to generate the
KR
signal to clear
the
keys. The first method uses the external
key
reset
signal (J4001-5).
This
interface
allows
the
key
reset
line to
be
activated
by
switches or push buttons located on or
near the station.
The second method is controlled by
the microprocessor
in
the control and
logic
circuitry. When jumper JU4002 is in
its alternate setting,
via
the C683 option, an
active
high signal
from the secure
ASIC
grounds
the
key
reset
signal line. The
source
of
the
key
reset request
is commonly
a
wireline function
tone,
which
is
communicated to the Secure board
via
the
HSR
signal.
68P81092E02
3/14/94
Chapter
1
Description
MSF
5000
Instruction Manual
Secure Board Functional Description
1-48
The
Secure board
provides two methods
to generate the
KR
signal to clear
the
keys. The first method uses the external
key
reset
signal (J4001-5).
This
interface
allows
the
key
reset
line to
be
activated
by
switches or push buttons located on or
near the station.
The second method is controlled by
the microprocessor
in
the control and
logic
circuitry. When jumper JU4002 is in
its alternate setting,
via
the C683 option, an
active
high signal
from the secure
ASIC
grounds
the
key
reset
signal line. The
source
of
the
key
reset request
is commonly
a
wireline function
tone,
which
is
communicated to the Secure board
via
the
HSR
signal.
68P81092E02
3/14/94