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Extra info for Cisco - Advanced Voice over IP Tuning and Troubleshooting 409
All rights reserved. Printed in USA. 12 Shape to CIR on Voice PVC Cico 3600 VAD (If desired) IP CRTP (If desired) Branch Office • Traffic shaping Frame Relay traffic shaping Shape to CIR on Voice PVC 409 1040_05F9_c2 77 © 1999, Cisco Systems, Inc. Low Speed WAN ATM Example Central Site + Remote Branch Considerations (ATM Typically Greater than T1) Regional Office Cisco 7200 • Prioritization IP-ATM CoS • Link efficiency ATM T1 and above “typically” not needed • Traffic shaping Cico 3600 Shape to VC parameters IP Branch Office 409 1040_05F9_c2 © 1999, Cisco Systems, Inc.
Scr 64 32 Congestion Detection and Feedback Effectiveness Depends on Round Trip Delay Router WAN Switch Access IGX/8400 T1 Ingress T1 Queue WAN Switch IGX/8400 Access Inter-Nodal Trunk Trunk Queue Egress 56 Queuekbps Trunk Queue ABR/ ABR/ Foresight Foresight Router 56kbps ABR/ Foresight FECN/ BECN ABR—Available ABR—Available Bit Bit Rate Rate FECN/BECN FECN/BECN Notification Notification Foresight/CLLM Foresight/CLLM Can Can Send Send aa Rate Rate Down Down from from Point Point of of Congestion Congestion Requires Requires Far Far End End to to Reflect Reflect aa FECN FECN and and Send Send and and BECN BECN Back Back to to Source Source Indicating Indicating aa Rate Rate Down Down Can Can Send Send aa Rate Rate Down Down from from Point Point of of Congestion Congestion Speeds Speeds up up Rate Rate Down Down Time Time over over FECN/BECN FECN/BECN Congestion Must Occur to Invoke, Congestion Relief Can be as Long as One Round Trip Time 409 1040_05F9_c2 65 © 1999, Cisco Systems, Inc.
Printed in USA. scr 70 35 Types of Echo Tail Circuit “Loud Echo” WAN/PSTN Router 0DB PBX Echo Echo Echo Echo -7DB • ERL should be greater than 15 DB • Typical echo canceller adds about 25 DB of echo reduction • Solution—fix echo source “Long Echo” 0DB at Time 0 WAN/PSTN Router PSTN Echo Echo Echo Echo -30DB 100 ms Later • Echo exceeds coverage range—Cisco echo coverage is 32 ms 409 1040_05F9_c2 71 © 1999, Cisco Systems, Inc. 131 30 db 20 db 10 db 0 db 0 ms 409 1040_05F9_c2 Low Delay Masking: Side Tone + Low WAN/Terrestrial Link Delay 50 ms 100 ms 150 ms © 1999, Cisco Systems, Inc.