The J2320 and J2350 midplane is located in the center of the chassis and forms the rear of the PIM card cage (see Figure 6 and Figure 7). You install the PIMs into the midplane from the front of the chassis. Data packets are transferred across the midplane from the PIM to the Routing Engine, and from the Routing Engine across the midplane to the destination PIM.
A time-division multiplexing (TDM) bus in J2320 and J2350 routers provides support for the Avaya VoIP module TGM550. The TGM550 converts the voice path from the TDM bus to compressed or uncompressed and packetized VoIP on an Ethernet connection. For more information, see PIM and VoIP Module Overview.