Avaya VoIP Monitoring Manager Release 3.1 Configuration Instrukcja Użytkownika Pobierz pdf (Strona 43)

RSVP Status

Issue 7 February 2006 43

Real-Time Transport

Protocol (RTP)

Real-Time Transport Protocol is the protocol used for transmitting real-time

data. For more information see IETF RFC 1889 located at

http://www.ietf.org/rfc/rfc1889.txt

Resource

ReSerVation

Protocol (RSVP)

RSVP is a protocol for reserving network bandwidth on the routers and

switches between two endpoints in a session (in some other protocol, such as

RTP. There are two reservations per session, one for each direction the data

has to travel. For further reference see the IETF RFCs 2205 and 2750 located

at http://www.ietf.org/rfc/rfc2205.txt

Round Trip Time

(RTT)

Round trip time is the length of time it takes a packet to traverse the network

and return (thus being a round trip). It is the sum of the two one-way network

delays between two endpoints. Callers can experience difficulties in carrying

on a normal conversation when the one-way network delay exceeds 500

milliseconds (ms). However, some users may elect to tolerate this. It can

comprise the following four components:

● Propagation delay: The time it takes for a packet to travel across the

network from sender to receiver. This variable is based on the speed of

light and the distance the signal must travel. For example, the

propagation delay between Singapore and Boston is much longer than

the propagation delay between New York and Boston.

● Transport delay: The time it takes to traverse the network devices along

a transmission path. Networks containing many routers, firewalls,

congestion and low-speed WAN services, for example, introduce more

delay than an overprovisioned LAN on a single floor of a building.

● Packetization delay: The time it takes for a compressor/decompressor

(codec) to digitize an analog signal, build frames and then reverse the

process at the other end. The G.729 codec has a higher packetization

delay than the G.711 codec.

● Jitter buffer delay: The delay introduced by the receiver while it holds

one or more packets to reduce variations in packet arrival times.

RSVP Status The RSVP status for an endpoint shows whether the RSVP is enabled on the

endpoint, and if it is, whether a reservation was established for the received

RTP data stream.

The RSVP status can change during a session. For example, if the RSVP

status for a single endpoint in a session has changed between significant

states (such as Failed and Success) then VoIP Monitoring Manager will use

the label Various to represent this situation. However, if the status has only

changed from Pending to Success, then VoIP Monitoring Manager will report

Success. Also, the RSVP status can be different for each endpoint in the

session. For example, RSVP may be disabled for one endpoint in the session,

and enabled for the other.

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