Avaya Definity TN570D Expansion Interface.

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• Provides 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 between 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
• Carries circuit-switched data, packet-switched data, network control, timing control, and DS1 control
• Communicates with the TN775B maintenance circuit pack in an EPN to send the EPN environmental and alarm status to the SPE
• Replaced by the TN2305 or TN2306 when an ATM switch replaced the CSS
• Used in an EPN that is supported by a Survivable Remote Processor (SRP)