Avaya Definity TN570B Expansion Interface (TN570B)

Definity TN570B

Overview:

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 12-Ports connecting to ISDN-BRI terminals
Each port has TXT, TXR, PXT, and PXR signal leads
Up to 8 ports can be used for adjunct switch application interface (ASAI) links
Each port operates at 192 kbps per second and has 2 B-channels and 1 D-channel
Requires a packet control circuit pack (TN778) when used in R6si systems or packet bus-equipped R6vs systems
Range of up to 3300 ft. maximum from the system to the voice terminal
Can connect 24 terminals where each terminal uses 1 B-channel and shares the D-channel
Provides control channel applications and time-slot interchanging between the PPN and EPNs
Carries circuit switched data, packet-switched data, network control, timing control, and DS1 control.
Used when ISDN-BRI and/or ASAI is connected in an EPN
Used in R7si/r or later systems