NEC Univerge sv8500 Manual page 1190

13.1.5 Quality of Service (QoS)
To distinguish transmission quality of signaling control data, MG-PRI/PRA can specify Type of Service
(ToS) of IP Precedence and Differentiated Service (Diffserv). The packets mapped by Diffserv are con-
trolled per switch, which is called Per Hop Behavior. The QoS is specified depending on your network en-
vironment. The following shows the packet types of IP Precedence and Diffserv.
Telephony Server (Internal PHI-PRI) does not control packets using ToS.
Note:
IP Precedence
7 6 5
Prec
Diffserv
6 5
7
DSCP
3 2 0
4 1
D T R
C
111
High
110
101
100
Priority
011
010
001
Low
000
4 3 2 0
1
EF
High
Priority
AF
Low
BF
Prec= PRECEDENCE (3 bits)
D=Delay (0/1= -/immediate sending is emphasized)
T=Throughput (0/1= -/transfer speed is emphasized)
R=Reliability (0/1= -/high reliability is emphasized)
C=Cost (-/low cost)
DSCP: Diffserve Codepoint (6 bits)
EF (Expedited Forwarding): 101110
AF (Assured Forwarding):
BF (Best Effort):
VOL.2-937
MG-PRI/PRA
111110
000010
000000