Quality of Service Parameters
123
The bandwidth available from the network may vary, but does not
become less than MCR.
The CoreBuilder 7000 switch forwards the ABR information to the end
users.
Three information elements are involved in the signaling of ABR
capability:
1
ATM traffic descriptor. includes:
Peak Cell Rate
Sustain Cell Rate
Max Burst Size
ABR Min Cell Rate.
2
ABR setup parameters include:
ABR Initial Cell Rate (ICR) — The rate at which each source may
initially commence transmitting.
ABR Transient Buffer Exposure (TBE) — The number of cells which can
be supported for a VC starting up before the control loop is
established.
Cumulative RM Fixed Round Trip Time (FRTT — The sum of the fixed
and propagation delays from the source to a destination and back.
Rate Increase Factor (RIF) — Controls the amount by which the cell
transmission rate may increase upon receipt of an RM-cell.
Rate Decrease Factor (RDF) — Controls the decrease in the cell
transmission rate.
3
ABR additional parameters include:
Nrm — Nrm is the maximum number of cells a source may send for
each forward RM-cell
Trm — Trm provides an upper bound on the time between forward
RM-cells for an active source.
CDF — The Cutoff Decrease Factor, CDF, controls the decrease in ACR
associated with CRM
ADTF — The ACR Decrease Time Factor is the time permitted between
sending RM-cells before the rate is decreased to ICR.
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...