Acer ISDN 128 Surf USB Uživatelský manuál stáhnout pdf (Strana 15)

Recommendation ITU-T Y.1541 IP QoS Classes and Objectives

QoS Classes and Objectives

Network

Performance

Parameter

Nature of

Objective

Class 0 Class 1 Class 2 Class 3 Class 4 Class 5

IP packet

transfer delay

(IPTD)

Upper bound on

the mean IPTD

100ms 400ms 100ms 400ms 1 s Unspec.

IP packet

transfer delay

variation

(IPDV)

Upper bound on

the 1-10

-3

quantile

of IPTD minus the

minimum IPTD

50ms 50ms U U U Unspec.

IP packet loss

ratio (IPLR)

Upper bound on

the packet loss

probability

1.10

-3

1.10

-3

1.10

-3

1.10

-3

1.10

-3

Unspec.

IP packet error

ratio (IPER)

Upper bound 1.10

-4

Unspec

Tab. 8 - Recommendation QoS services

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 36 37

2 Principles of VoIP 1
Num. of layer 2
1990 1995 1995 1996 1996 4
3 Quality of Service (QoS) 7
5.1 Test method of QoS 9
5.2 About utilities 9
5.4 Solution of QoS test 11
Fig. 7 - Delay of flow 14
QoS Classes and Objectives 15
Pentium II, 300MHz, 128 MB 17
Pentium 4, 2.6 GHz, 1 GB RAM 17
6.2 Part of clients 22
Fig. 12 - X-Lite softphone 23
Fig. 11 - iPhone client 23
Fig. 13 - SJphone 24
6.3 Part of ISDN connections 26
$ modprobe hisax type=13 28
Fig. 19 -xlite client 33
Appendix A 35
Reference: 36

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