The Definity TN570C Expansion Interface provides an interface between the TDM bus and packet bus, and fiber optic links interconnecting cabinets.

The Definity TN570C Expansion Interface 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 Definity TN570C Expansion Interface provides control channel applications and time-slot interchanging between the PPN and EPNs.

The Definity TN570C Expansion Interface is used when ISDN-BRI and/or ASAI is connected in an EPN and is used in R7si/r or later systems.

The Definity TN570C Expansion Interface is also used in SREPN (Survivable Remote Expansion Port Network), R7 or later csi.

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