Specifications

Chapter 1 Introduction Installation and Operation Manual
1-14 Functional Description RICi-4E1/T1, RICi-8E1/T1 Ver. 2.0
Quality of Service
RICi-4E1/T1, RICi-8E1/T1 support QoS mapping to priority queues (3 PQ, strict
priority, per bridge port) at the E1/T1 egress according to one of the following:
• VLAN priority (802.1p)
• DSCP (ToS byte)
• Port-based
0
01234567890
1
0
2
0
3
1
VERSION IHL
TOS
TOTAL LENGTH
IDENTIFICATION FLAGS FRAGMENT OFFSET
TIME TO LIVE PROTOCOL HEADER CHECKSUM
SOURCE ADDRESS
DESTINATION ADDRESS
123456789 123456789
OPTIONS PADDING
IP
HEADER
Figure 1-3. IP Header
Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7
DS5 DS4 DS3 DS2 DS1 DS0 XX XX
DSCP: six bits (DS5–DS0)
Figure 1-4. ToS Byte DSCP Field