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Find the solution for support timing supply

Hi there:

I'm helping my customer to find the new resource for EOL older part. But not sure which catalog is correct. 

the general description as following: "The DS26503 is a building-integrated timingsupply (BITS) clock-recovery element. It also functions as a basic T1/E1 transceiver. "

Could you help us to find the possible solution or suggestion for RD? 

Thanks again. 

The reference spec as following: