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Dear Mr. Babu,
As far as my understanding of the concepts in your question goes, SDI and routing of periodicals both are types of current awareness service . The defference being, the SDI is highly personal service keeping in mind the preofile of the user ( i.e the interest areas of an individual user).
In my opinion, If you are routing all the periodicals being subscribed by the library to all the users or a select group of users irrespective of their specialisation, areas of interest (i.e. the users' profile) in a fixed sequence, it is a kind of Current awarenes service.
The moment you start maintaining a users' profile and start routing periodicals according to their profiles, it becomes SDI.
Following link to the article on literature review of SDI will give you more insight into the topic
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