Avaya Definity TN573B
Switch-Node Interface (G3R only)

• Routes circuit, packet and control messages.
• Is an interface (Installed in an SN carrier in a CSS that terminates a fibre optic from the SNI in an SN carrier to an SNI in another SN carrier, an EI in a PPN, and an EI in an EPN.
• One TN573B is used per PN and supports the TN574 DSI converter circuit pack.
• The TN573B and higher provides an interface to the single-mode fibre optic transceiver and supports the TN1654 and the TN574 DSI converter circuit pack.

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We sell new and remanufactured TN2181 cards.

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