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Cisco vo ip
- 1. VoIP Voice Over InternetProtocol
- 2. Benefits of PacketTelephony Networks • More efficient use of bandwidth and equipment • Lower transmission costs • Consolidated network expenses • Improved employee productivity through features provided by IP telephony: – IP phones are complete business communication devices • Directory lookups and database applications (XML) • Integration of telephony into any business application – Software-based and wireless phones offer mobility • Access to new communications devices (such as, PDAs and cable set-top boxes)
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- 4. Two Basic Methodsfor Voice over IP
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- 6. Analog Interfaces Analog InterfaceType Description FXS Used by the PSTN or PBX side of an FXS–FXO connection FXO Used by the end device (phone) side of an FXS–FXO connection E&M Trunk, used between switches
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- 8. Digital Interfaces Interface Voice Channels(64 kbps Each) Signaling Framing Overhead Total Bandwidth BRI 2 1 channel (16 kbps) 48 kbps 192 kbps T1 23 1 channel (64 kbps) 8 kbps 1544 kbps E1 30 64 kbps 64 kbps 2048 kbps
- 9. Stages of aPhone Call
- 10. Stages of aPhone Call
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- 12. Basic Voice Encoding: ConvertingAnalog to Digital
- 13. Voice Codec Characteristics Standard Bandwidthper Voice Channel G.711 64 G.726 16, 24, 32 G.729 8
- 14. Describe Cisco VoIP Implementations •EncapsulatingVoice Packets for Transport
- 15. Voice Encapsulation Examples •Digitized voice is encapsulated into RTP, UDP, and IP. • By default, 20 ms of voice is packetized into a single IP packet.
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- 18. Cisco IP Phone •Voice traffic tagged for voice VLAN
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- 20. Power over Ethernet(PoE) • Sending operating power over Ethernet Category 5 cable • Power-sourcing equipment (PSE) – Switches, power injector • Powered devices – IP phones, Access points • Distances up to 100 meters • Alternative: AC power adapter
- 21. Midspan Power Injection •Uses pairs 4,5 and 7,8 • Requires eight-wire cabling • Does not extend 100-m total length limit • Not possible for 1000TX
- 22. Power-Sourcing Equipment •Power injector •AIR-PWRINJ3/AIR-PWRINJ-FIB •Powering switch • Cisco Catalyst 3560-PS/3750-PS • Cisco Catalyst 4500/6500 switch with inline power line cards • Router module NM-16ESW-PWR • Router card HWIC-4ESW-POE • Router with PoE support
Editor's Notes
- #21Â To decrease the cost and complexity of the installation, the Cisco Aironet 1200 and 1100 can be powered over an Ethernet cable, eliminating the need to run expensive AC power to remote access point installation locations. No electrician is required. Anyone qualified to run Cat 5 cable can install the cabling required to power Cisco Aironet Access Point. Remember the standard Cat 5 cable requirements still apply (maximum 328 feet or 100 meters). New Power over Ethernet switches like C3750-24PS switch can supply power of up to 15W per port. Up to 15W power is required for dual-mode access points.
- #23Â Power Injector AIR-PWRINJ3 / AIR-PWRINJ-FIB Powering switch Catalyst 3560-PS Catalyst 3750-PS Cisco Express CE500-LC / CE500-PC Catalyst 4500 / 6500 switch with inline power line cards Catalyst 6500 switch with inline power line cards Router Modul NM-16ESW-PWR (Router Series 2600/2800/3600/3700/3800) Router Card HWIC-4ESW-POE (Router 2800/3800) Router with PoE Support (Router 1801/1811/1812)