Avaya IP Telephony Konfigurationsanleitung PDF herunterladen (Seite 34)

34 Chapter 3 Installing IP telephones

P0937663 03.1

Choosing a Jitter Buffer

A jitter buffer is used to prevent the jitter associated with arriving (Rx) voice packets at the IP

telephones. The jitter is caused by packets arriving out of order due to having used different

network paths, and varying arrival rates of consecutive voice packets.The greater the size of the

jitter buffer, the better sounding the received voice appears to be. However, voice latency (delay)

also increases. Latency is very problematic for telephone calls, as it increases the time between

when one user speaks and when the user at the other end hears the voice.

The administrator can adjust the default jitter buffer size to the following values:

• NONE: Minimal latency, best for short-haul networks with good bandwidth.

• AUTO: Business Communications Manager will dynamically adjust the size.

• SMALL: Business Communications Manager will adjust the buffer size, depending on

CODEC type and number of frames per packet to introduce a 60-millisecond

delay.

• MEDIUM: 120-millisecond delay

• LARGE: 180-millisecond delay

Installing i-series telephones

The Nortel Networks i-series telephones can be configured to the network by the end user or by the

administrator. If the end user is configuring the telephone, the administrator must provide the user

with the required parameters.

A maximum of 90 IP telephones, including Nortel Networks i2050 Software Phones, and H.323

devices, can be connected on the Business Communications Manager system.

Before installing

Before installing the i2002 or i2004 telephone, ensure that:

• ensure the telephone has the appropriate power supply for your region

• if powered locally, ensure the installation site has a nearby power outlet;

otherwise, it can be powered through a Power Inline Patch Panel (PiPP)

• the installation site has a 10/100 BaseT Ethernet connection

• if you are not using the 3-port switch, you have 10/100 BaseT Ethernet connections for both

the telephone and for your computer equipment.

Caution: Do not plug the telephone into an ISDN connection. This can cause severe

damage to the telephone. Plug the telephone only into a 10/100 BaseT Ethernet connection

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Avaya IP Telephony Konfigurationsanleitung Seite 34