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Extra resources for Cisco - Advanced Voice over IP Tuning and Troubleshooting 409

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Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 60 30 Anatomy of a Carrier Customer Premises Equipment Access Lines Inter-Node Trunks “The Cloud/Carrier” Frame Relay, ATM WAN Switch Fabric Inter-Node Trunk Over Subscription Often 3:1 or Higher 409 1040_05F9_c2 61 © 1999, Cisco Systems, Inc. WAN Queuing and Buffering Router WAN Switch Access IGX/8400 T1 Ingress T1 Queue WAN Switch IGX/8400 Access Inter-Nodal Trunk Trunk Queue Packets Arrive at Line Rate Placed in Ingress Queue Router 56kbps Trunk Queue Egress 56 Queuekbps Packets De-Queue at Line Rate Packets Leak into Trunk at PIR—(Peak Information Rate) Typically Lowest Access Rate—56 kbps 409 1040_05F9_c2 © 1999, Cisco Systems, Inc.

Printed in USA. scr 84 42 409 1040_05F9_c2 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA.

All rights reserved. Printed in USA. scr 78 39 Low Speed WAN Pt to Pt Example Point-to-Point Considerations Regional Office • Prioritization Cisco 7200 IP Prec/RSVP • Link efficiency MLPPP with fragmentation and interleave 256 kbps VAD (if desired) CRTP (if desired) Cico 3600 IP • Traffic shaping Branch Office 409 1040_05F9_c2 N/A 79 © 1999, Cisco Systems, Inc. 12 if remote low-speed • Traffic shaping Shape to VC parameters • Traffic shaping Frame Relay traffic shaping N/A • Traffic shaping N/A Shape to CIR 409 1040_05F9_c2 © 1999, Cisco Systems, Inc.

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Cisco - Advanced Voice over IP Tuning and Troubleshooting 409


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