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Extra resources for Cisco - Traffic Engineering for Voice over Integrated Service Networks
Example text
Printed in USA. 1 Code Lookup Ingredients ngredients A Sound K Sound Directions Play K, A, and K Recipe or Code Book 407 1015_05F9_c1 71 © 1999, Cisco Systems, Inc. Voice Transport Choices Voice L3 L2 HDLC L1 IP PPP ATM Frame Relay PDH or SDH Each Layer Adds a Bandwidth Requirement which Must Be Accounted for in Proper Network Traffic Engineering 407 1015_05F9_c1 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. 44M frames (20 byte frames) or 400 fps • ATM 1 Erlang = (AAL1) 655K cells or 182 cells/second = (AAL5) 600K cells or 167 cells/second 407 1015_05F9_c1 73 © 1999, Cisco Systems, Inc.
Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 74 37 RTP/RTCP—RFCs 1889/1890 • End-to-end network transport function Payload type identification—voice, video, compression type Sequence numbering Time stamping Delivery monitoring • RTCP (Real-Time Control Protocol) V 4bytes E R CC M Payload Type Sequence Number 4bytes RTP Timestamp 4bytes Synchronization Source (SSRC) ID 407 1015_05F9_c1 75 © 1999, Cisco Systems, Inc. VoIP Bandwidth Solution RTP Header Compression • 20ms@8kb/s yields 20 byte payload • IP header 20; UDP header 8; RTP header 12 Version Time to Live 2X payload!!!!!!!!
AAL Cell Tax AAL–1 Cell Tax AAL–2 Cell Tax 5 Byte Header 5 Byte Header 1 Byte 47 Byte Payload 1–47 Byte Payload AAL–3/4 Cell Tax 1–48 Bytes AAL–5 Cell Tax 5 Byte Header 5 Byte Header 44 Byte Payload 48 Byte Payload No Tax 407 1015_05F9_c1 4 Byte © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 84 42 ATM Adaptation Layer—AAL ATM Adaptation Layer (AAL) PBX AAL C S ATM Layer S A R Physical Layer • AAL = CS + SAR • CS—cell tax • SAR—cell <-> packet 407 1015_05F9_c1 85 © 1999, Cisco Systems, Inc.