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Request a Quote TN573B Avaya TN573B Switch Node Interface The TN573B routes circuit, packet, and control messages. It is installed in a SN carrier in a CSS that terminates a fiber optic link from a SNI in another SN carrier, and EI in a PPN, and an EI in an EPN. One TN573B is used per PN and supports the TN574 DS1 converter circuit pack. The TN573B and higher provides an interface to the single-mode fiber optic transceiver and supports the TN1654 and TN574 DS1 converter circuit pack. Avaya TN573B Switch Node Interface