, нужно сложить мнение, для себя

Хочу у специалистов, разобраться, о необходимости?

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If using in a chain, in case of a failure of an intermediate MiniFlex SHDSL.bis, the SHDSL lines can be bypassed with the help of an optional Bypass Relay Line Card. In that case, the DSL Bypass Relay Line card will automatically switch the incoming SHDSL ports to the outgoing SHDSL ports, keeping the chain in operation.