Appendix C: Bypass Specifications; Bypass Control Register Map - Nexcom NSA 5130 User Manual

Appendix C: Bypass Specifications

Appendix C: Bypass Specifications
NSA 5130 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 gate-
way, for example, it is crucial that they provide LAN bypass functionality to
ensure that hardware failure on these appliances will not bring down the
entire network.

Bypass Control Register Map

BTCR - Bypass Timer Configuration Register = 0XF2
Bit 7 Bit 6 Bit 5 Bit 4
R X X X
Timer Not Not Not
expired used used used
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Bit 3 Bit 2 Bit 1 Bit 0
X R/W
Not Global timeout value
used
Power ON State Bypass Control Status Register = 0XF3
Bit 7 Bit 6 Bit 5
W X
Bypass mode Not
used
Power OFF State Bypass Control Status Register = 0XF7
Bit 7 Bit 6 Bit 5
X X X
Not Not Not
used used used
90
Bit 4 Bit 3 Bit 2 Bit 1
X X X W
Not Seg- Seg- Seg-
used ment 4 ment 3 ment 2
Bit 4 Bit 3 Bit 2 Bit 1
X X X W
Not Seg- Seg- Seg-
used ment 4 ment 3 ment 2
NSA 5130 User Manual
Bit 0
W
Seg-
ment 1
Bit 0
W
Seg-
ment 1