Research Article
Towards Internet QoS Provisioning Based on Generic Distributed QoS Adaptive Routing Engine
Table 2
DSCP Assignation for Internet traffic.
| Service Group |
Service Category |
Major Service classes |
Flow C/Cs | QoS Metrics |
DSCP Value |
Traffic class | Minor Service classes | Timeliness | B.W | Reliability | RT (sec) | Delay (ms) | Jitter (ms) |
| | Best Effort | Default | Unclassified | U | U | U | U | U | 000000 | CS0-Default | Everything else |
User oriented | Data oriented | Low priority | Symmetric | 1 sec | <200 | N/A | Elastic | Zero Loss | 001000 | CS1 | Internet Chat | Interactive | (i) short lived (ii) Low Latency (iii) Asymmetric | 2–5 | 250–400 | N/A | Elastic | Zero Loss | 010010 010100 010110 | AF23 AF22 AF21 | Telnet Web Browsing Enhanced Web | Bulk Transfer | (i) long-lived (ii) High Throughput (iii) Asymmetric | 2–5 | Low-Medium | N/A | Elastic | Zero Loss | 001010 001100 001110 | AF11 AF12 AF13 | E-Mail FTP Billing transfer | Media oriented | | | | | | | | | | | Tolerant Real Time Symmetric | Multimedia Conferencing | (i) interactive (ii) group communication (iii) Rate adaptive | Rate adaptive | <150 | <400 | 8 kbps–1 Mbps | Very low loss | 100110 100100 100010 | AF43 AF42 AF41 | Audio Audio graphics video | Telephony Service | CBR, fixed small packets, Interactive and fast response | <150 | <100 | <400 | 8 kbps–1 Mbps | Very low loss | 101110 101100 | EF EF | VOIP Videophony | Intolerant Real Time Symmetric | Broadcasting | (i) Inelastic (ii) CBR and VBR | 2–5 | <150 | 50–100 | 56 K–40 M | low loss | 011010 011100 | AF31 AF32 | Broadcast Video Broadcast Audio | Streaming | (i) Elastic (ii) Variable packet size | 2–5 | <150 | <100 | 64 k–60 M | low loss | 011000 | CS3 | Streaming media | Interactive | (i) Inelastic (ii) VBR | 2–5 | <150 | <100 | 64 k–60 M | low loss | 100000 | CS4 | VoD |
|
Network oriented | Network Control | Routing and control information | Inelastic-Short messages | N/A | 1–10 s | N/A | Elastic | Zero Loss | 110000 | CS6 | Routing information | Operation and Management signaling | OAM | Inelastic-Short messages | N/A | 50–100 | N/A | Elastic | Zero Loss | 010000 | CS2 | OAM | Application Control | Signaling Service Class | Inelastic-Short messages | N/A | 50–100 | N/A | Elastic | Zero Loss | 101000 | CS5 | VOIP Signaling |
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