Avaya 3645 Kurulum Kılavuzu - Sayfa 12

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Installation Guide

or dynamically using standard DHCP protocol. The Avaya Handset Configuration Cradle can be used to

quickly load and change administration options in the Avaya wireless telephones including static IP

addresses. For dynamic IP addressing, a DHCP server is required.

Avaya Voice Priority Processor (AVPP) also requires an IP address and supports either static or DHCP

address assignment. When using one or more AVPP(s), one AVPP will serve as the Registration AVPP

and must be assigned a static IP address. The Registration AVPP IP address should be designated in

the DHCP scope for the handsets.

3.3 Software Updates Using TFTP

The Avaya wireless telephones and related infrastructure are field-upgradeable in terms of new software

features or capabilities and bug fixes. Avaya wireless telephones and AVPP utilize a TFTP client to

automatically download new code when available. Ideally the TFTP serving software updates will be

located on the local network and not over a WLAN connection.

4.0 Quality of Service

4.1 Avaya Voice Priority Processor (AVPP)

Quality of service (QoS) is a means of providing a level of service that will result in a network

connection of acceptable quality. Typically this results in providing different levels of service for

different applications, depending on their requirements. When data and voice are competing for

bandwidth, it is necessary to have a prioritization method that provides a controlled preference to voice

packets. The initial 802.11 standards did not provide a practical QoS mechanism, so Avaya utilized the

AVPP to allow delay-sensitive voice and asynchronous data applications to coexist on a Wi-Fi network

without compromising voice quality.

Good voice quality is ensured on a shared network with an AVPP, which is fully compatible with Wi-Fi

networks. Supported by the leading AP vendors as the de facto standard for voice QoS, the AVPP

guarantees audio quality in a shared voice and data network. Access points generally use random

back-off intervals and require all types of traffic to contend for access to the wireless medium with

equal rights. However, treating all traffic equally can cause significant delays to voice traffic. Modifying

the AP behavior to recognize and prioritize voice packets increases the probability of better

performance while continuing to treat asynchronous data packets normally. The two operations that

comprise AVPP compliance in the AP, minimizing random back-off and priority queuing, require a

packet-filtering mechanism. Packet filtering requires recognizing the packet's type. Avaya wireless

telephone packets are registered as protocol ID 119 at layer 4. The AVPP also performs packet

delivery timing through the AP to the wireless telephones, which is critical for ensuring seamless

handoffs among APs and for enhanced battery management. The following section offers a more

detailed explanation of timed delivery.

4.1.1 AVPP Infrastructure

To trigger AVPP functionality in the APs from the wired side of the network at least one AVPP is

required. A model AVPP-010 or AVPP-020 can support smaller installations however at least one

AVPP-100 is required for applications using greater than 80 handsets.

4.1.2 AVPP Capacity

A single AVPP-100 supports 80 simultaneous calls. Multiple AVPP-100s can be used to increase

capacity to support up to 850 total calls (which can support approximately 8,000 wireless telephones.)

For smaller IP telephony interface deployments, 10 and 20-user AVPPs are also available. Refer to

the AVPP administration guide for additional information regarding the maximum number of

simultaneous calls and wireless telephones supported by multiple AVPPs.

Octiober 2008