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Request a Quote TN570C Avaya TN570C Expansion Interface The TN570C provides an interface between the TDM bus and packet bus, and fiber optic links interconnecting cabinets. It is used in a Port Network (PN) between a PN and another PN in a direct-connect system and a PN and an SNI in a switch node carrier in a CSS-connected system. The TN570C also provides control channel applications and time-slot interchanging between the PPN and EPNs. It is used when ISDN-BRI and/or ASAI is connected in an EPN, and in R7si/r or later systems. The TN570C is also used in SREPN (Survivable Remote Expansion Port Network), R7 or later csi. Avaya TN570C Expansion Interface