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[6] ISA ES–16 ports protection
ISA ES–16 board supports the EPS protection scheme as well as ISA ATM and ISA PR_EA boards.
The EPS protection scheme is 1+1, where the main and spare positions are assigned by
managementsystem in a flexible way (Note).
Note: The board main and the board spare have to be configured on throughput equivalent slot (i.e. both
not enhanced slots or both enhanced slots).
The characteristics of the protection scheme: the switching type is unidirectional (single–ended), the
operation type is Not Revertive (this means that WTR time is not applicable), the external commands are:
Manual Switch working, Manual Switch spare, and Clear. The command Lockout of spare is not provided,
as well Force switch working and Force Switch spare.
The access cards (Fast Ethernet and Gigabit Ethernet) are not protected by the EPS protection scheme,
this means if the board switches the Ethernet traffic carried by the local physical interfaces is lost, unless
a protection scheme is configured on the client side like dual attach protocol for the Gigabit Ethernet
interfaces.
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