136
C
HAPTER
6: ATM S
WITCHING
The EFCI bit in the Payload Type Identifier (PTI) field in the cell header is
set when congestion is encountered. The EFCI bit is set based on one of
the following defined output queue levels: 20% full, 50% full, 80% full.
These output queue levels can be configured only for the CoreBuilder
7000 (REV-C). For the CoreBuilder 7000HD, the level is hardcoded as
50%.
The EFCI function is only implemented on the low priority queue. When
the CoreBuilder 7000 family ATM switch receives notification of
congestion and the output queue levels defined are reached, it sets the
EFCI bit.
Priority Output Queues
The CoreBuilder 7000 ATM switch assigns its output queues two levels of
priority: high priority and low priority. It processes the address bits
associated with each cell and determines whether the associated cell is
loaded into the high priority or low priority queue. Each virtual circuit can
be connected through the high or low priority queues. High priority
channels are used for delay sensitive data. Each output port is serviced by
a high/low priority multiplexer that removes cells from the high and low
priority queues. The multiplexer always gives preference to high priority
cells.
Summary of Contents for CoreBuilder 7000
Page 12: ......
Page 30: ...30 CHAPTER 1 ATM NETWORK BASICS...
Page 32: ...32 CHAPTER 1 ATM NETWORK BASICS...
Page 34: ...34 CHAPTER 1 ATM NETWORK BASICS Figure 8 LANE Network over WAN...
Page 96: ...96 CHAPTER 4 PRIVATE NETWORK TO NETWORK INTERFACE PNNI VERSION 1 0...
Page 184: ...184 CHAPTER 7 LAN EMULATION VERSIONS 1 0 AND 2 0...
Page 206: ...206 CHAPTER 9 DEVICE MANAGEMENT...
Page 222: ...222 APPENDIX A TECHNICAL SUPPORT...
Page 234: ...234 APPENDIX B PROTOCOLS AND INTERFACES...
Page 238: ...238 APPENDIX C COREBUILDER 7000 FAMILY ATM SWITCH SPECIFICATIONS...
Page 242: ...242 APPENDIX D SAFETY INFORMATION...
