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Using the Centillion EtherSpeedII Switch Modules
1-4 207344-B
MPOA is the ATM Forum standard that specifies a method to efficiently
transport intersubnet unicast data in a LAN emulation (LANE) environment.
MPOA uses LANE and Next Hop Resolution Protocol (NHRP) processes to
allow direct shortcut virtual channel connections (VCCs) to be established for
intersubnet communication without requiring passage through a router. The
intrasubnet communication continues to be supported over LANE. For IP,
Nortel Networks has adopted MPOA as the standard to implement layer 3
switching in an ATM network.
• Improved performance in segmentation and reassembly (SAR) performance
to 3.2 gigabits per second (Gb/s).
• MultiLink Trunking (MLT)
Physical Description of the Switch Modules
The EtherSpeedII 10/100BASE-T switch module (Figure 1-2) consists of a
printed circuit board with a metal module faceplate. The switch module includes
captive retaining screws and inserter/extractor levers on the top and bottom of the
front panel.
Figure 1-2. EtherSpeedII 10/100BASE-T 20-Port Switch Module
9454FA
Inserter/extractor
levers
Captive retaining
screws
LEDs
Backplane connector
Printed circuit
board
20 10/100BASE-T ports (RJ-45)