Copyright © 2011 NEXCOM International Co., Ltd. All Rights Reserved.
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Appendix B: Bypass Specifications
DNA 1120/1120A User Manual
DNA 1120/1120A provides LAN bypass functionality to ensure that data
can still pass through the device, even when it is powered off. This feature
helps ensure the continuous flow of data through the device in the event
of a hardware failure. For network security appliances deployed at the
gateway, for example, it is crucial that they provide LAN bypass functional-
ity to ensure that hardware failure on these appliances will not bring down
the entire network.
a
PPendix
B: B
yPass
s
PeCifiCations
BTCR - Bypass Timer Configuration Register = 0XF2
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R
X
X
X
X
RW
RW
RW
Timer
expired
Not
used
Not
used
Not
used
Not
used
Global timeout value
BCSR - Bypass Control Status Register = 0XF3
Bypass Control Register Map
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
W
X
X
X
X
X
W
Bypass mode
Not
used
Not
used
Not
used
Not
used
Not
used
Seg-
ment 1
