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We consider type IIB superstring theory with embedded $D5$-brane and chooseboundary conditions which preserve half of the initial supersymmetry. In thecanonical approach that we use, boundary conditions are treated as canonicalconstraints. The effective theory, obtained from the initial one on thesolution of boundary conditions, has the form of the type I superstring theorywith embedded $D5$-brane. We obtain the expressions for $D5$-brane backgroundfields of type I theory in terms of the $D5$-brane background fields of typeIIB theory. We show that beside known $\Omega$ even fields, they containsquares of $\Omega$ odd ones, where $\Omega$ is world-sheet paritytransformation, $\Omega:\sigma\to -\sigma$. We relate result of this paper andthe results of [1] using T-dualities along four directions orthogonal to$D5$-brane.

$D5$-brane type I superstring background fields in terms of type IIB ones by canonical method and T-duality approach