AT&T DEFINITY 7100 series Bedienungsanleitung PDF herunterladen (Seite 65)

CONTROL CIRCUIT PACKS

Expansion Interface TN776 (G3iV2)

Provides for the extension of the TDM bus from the PPN cabinet to

the TDM bus of the EPN cabinet. Packages the TDM control chan-

nel with LAPD control for transmission over the fiber link between

cabinets. Provides the time slot interchange between cabinets. A

system with ASAI/BRI requires TN570 Expansion Interface circuit

packs instead of TN776 Expansion Interface circuit packs to con-

nect the TDM bus and packet bus of the PPN to the TDM bus and

packet bus of the EPN(s).

Expansion Interface TN570 (G3iV2 and G3rV2)

TN570 is an interface in the fiber-optic links that interconnect

cabinets. It is used in a port network in the following cabinet

connections:

●

Between a port network and another port network in a

●

directly-connected system

Between a port network and a Switch Node Interface in a

switch node carrier in a Center Stage Switch-connected

system.

The TN570 also provides control channel connectivity and time slot

interchanging between the PPN and the EPNs.

The TN570 carries the following information: circuit-switched data,

packet-switched data, network control, timing control, and DS1 con-

trol.

Lightwave Transceivers (4-Type or 9823-Type)

Mount on an I/O connector located on the backplanes of multicarrier

cabinet (MCC) and single-carrier cabinet (SCC) systems requiring

an Expansion Port Network.

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AT&T DEFINITY 7100 series Bedienungsanleitung Seite 65