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Avaya Definity TN570C Expansion Interface.
- Provides an interface between the TDM bus and packet bus, and fiber optic links interconnecting cabinets
- 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
- Provides control channel applications and time-slot interchanging between the PPN and EPNs
- Used when ISDN-BRI and/or ASAI is connected in an EPN
- Used in R7si/r or later systems
- TN570C used in SREPN (Survivable Remote Expansion Port Network), R7 or later csi
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