, - IP, , . QoS, IP- . IP- , IP- . ITU-T QoS /IP NGN (New Generation Network):
1. IP ;
2. , - ;
3. ;
4. .
2002. 13- ITU-T , . ITU-T Y.1540 IP. ITU-T Y.I541 , Y.1540, - .
, . , IP . , . , ( ) Y.1540 Y.1541 IP- . Y.1540 Y.1541, QoS IP-.
ITU-T Y.1540
ITU-T Y.1540 ( ), :
;
/ ;
;
();
.
, , , /. , . ITU-T Y.1540 , . ITU-T Y.I541 , , , , ITU-T Y.1221.
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/
. , , . Y.1540, IP- ( ) (Measurement Point). , . - .
IP
, - , . ITU-T Y.1540 - IP-. IP, . QoS ( ) . ITU-T Y.1540 , IP :
IP- (IP packet transfer delay, IPTD);
IPTD (t2 t1) - t1 t2, t2 > t1 (t2 - t1) < Tmax;
IPTD , , .
IP , Y.1540, . , , . , , . , , , , .
IP- (IP packet delay variation, IPDV)
IPDV, Vk( ) IP- k ( ) k k, ( ) d1,2 : Vk= Xk− d1,2. d1,2 . , , , . IP- , , , .
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IP (IP packet loss ratio, IPLR)
IPLR . IP , , Tmax. , . VoIP , , Tmax, , . , , , .
IP (IP packet error ratio, IPER)
IPER , , , .
ITU-T Y.1541
ITU-T Y.1541 , Y.1540, , IP. , . QoS, , . 14.1 . , , , , , , . Y.1541 , - , , .. IP - 1-20 50 /. , 60 .
14.1. IP
QoS | ||||||
IP, IPTD | 100 | 400 | 100 | 400 | 1 | |
IP, IPDV | 50 | 50 | ||||
IP, IPLR | 1*10-3 | 1*10-3 | 1*10-3 | 1*10-3 | 1*10-3 | |
IP, IPER | 1*10-4 | 1*10-4 | 1*10-4 | 1*10-4 | 1*10-4 |
: .
Y.1541 :
0 , , (VoIP, );
1 , , (VoIP, );
2 , (, );
3 - , ();
4 - , ( , );
5 - IP, QoS.