Dropped voice calls during periods of high network utilisation
Interface buffer overruns
Ingress Interfaces Only
Ingress and Egress Interfaces
Egress interfaces Only
The three least significant bits specify the drop probability.
The 8 TOS bits are used for DSCP.
To convert DSCP to IP Precedence, the three highest bits are matched.
DSCP provides for up to 8 precedence levels, with two drop probabilities.
Source and Destination Address
Source or Destination Port
Whether or not the PE router is managed by the service provider
Whether or not the CE router is managed by the service provider
Whether or not the service provider is using an MPLS core
The SLAs offered by the service provider
Predictor or stacker
To distinguish between exceeding and violating traffic
To distinguish between conforming and exceeding traffic
To allow the setting of both Layer 2 and Layer 3 QOS markers at the same time
To allow marking of the traffic before transmission
FRF.12 fragmentation is used on DLCIs configured for VoIP
FRF.12 fragmentation is used on DLCIs configured for VoFR
FRF.11 Annex C fragmentation is used on DLCIs configured for VoIP
FRF.11 Annex C fragmentation is used on DLCIs configured for VoFR
MPLS EXP bits.
Jitter, Delay, Packet-loss.
Latency, WRED, Attenuation.
AIS, Latency, NEXT.
SNR, Delay, WRED.
Latency less that 150 ms
Jitter less than 30 ms
Loss less than 1 percent
Bandwidth 80kbps per call minimum for all codecs
Retransmit interval less than 10 ms