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MSF
5000
Instruction Manual
Chapter
1
Description
Secure Board Functional Description
O
RCVKEYFAIL:
If
enabled, the
750
Hz
tone
is encoded with an
87 ms on
and
an 87 ms off
duty
cycle,
if
coded receive
activity
occurs when the receive
decryption hybrid has lost its
key.
The
tone sequence
is generated
as
long
as
these
two conditions
exist.
Key
Variable Loader Interface
68P81092E02
3/14/04
Key
Insertion
The
Key
Variable Loader
(KVL)
is an external optional device to transfer
encryption keys from its own memory into
other
SECURENET
equipment
containing
secure
hybrids.
A KVL
is
only compatible with hybrids of
the same
type,
as
specified on the back of the
KVL
unit.
The station internal
Secure Interface cable connects between the Secure board
connector J4001 to the
Junction
Box. The station external
KVL
cable connects
between the
KVL
and the
Junction
Box.
NOME
When
a
KVL
is connected to the station, the station is
placed
in
access
disable mode.
Refer
to
Chapter
2
-
Operation for
the procedure to
load encryption keys.
A
synchronized.clock signal
(the
KVL
clock synchronization signal) is
generated
by
the secure
ASIC
and phase-locked to the
Key
Insertion
Device signal. After all
keys have
been loaded, the
KVL
connector must be disconnected to take the
station out of access disable mode.
A
successful
key
transfer is indicated
in
the
KVL
display
for
all hybrid types, with
the exception
of option
DVP
Hybrid.
Key
Variable Battery Backup
A
key variable
battery backup is provided
with all
secure
hybrid
options to
allow
the
hybrids
to retain their
encryption/ decryption keys in
case
of power
loss.
If
the
+5
Vdc supply
drops out, the
Vcs supply
to the
hybrids must
be
maintained
above +2
Vdc
for
key
data retention.
The
3.6
Vdc, 1Ahr lithium
battery provides
a
minimum of
4
years of
key
retention time for eight
hybrid installations, and up
to
10
years of
key
retention time for
two hybrid installations. The Encode
/ Decode
Secure board
kit
number is TNN6005, part number 6082452R02.
Key
Clearing
The
Key
Reset
(KR)
signal (active low pin
7)
of
the secure
hybrids provides
a
means to erase all
of
the
hybrid keys
simultaneously,
which
prevents any further
encryption or decryption.
This
function is provided for all hybrid options,
with
the exception of option C794
DVP
Hybrid.
1-47
NOME
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