TN776 Expansion Interface (for R6 or earlier si)

TN776 Features

Connected to the Time Division Multiplexing (TDM) bus in one Port Network (PN) is an interface between that PN and the TDM bus extended to another PN
Packages the TDM control channel with Link Access Procedure on the D-channel (LAPD) for transmission over the fiber link between cabinets
Provides the time-slot interchange between cabinets
A system with ASAI/BRI or with PRI signaling for the packet bus (PACCON) requires a TN570B/C EI circuit pack in place of a TN776 circuit pack
Replace by TN570B/C in R7si and later