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Chapter 17 xDSL Profiles Setup
IES-1248-51V User’s Guide
145
at time B. If the next cell arrives earlier than time C, it is discarded or tagged for
not complying with the TAT. Time C is calculated based on the CDVT or BT.
Figure 66 TAT, CDVT and BT in Traffic Shaping
17.4 Upstream Policing
Upstream policing is an agreement between the carrier and the subscriber to
regulate the average rate and fluctuations of data transmission coming from the
subscriber's device to the IES-1248-51V.
Note: Upstream policing controls incoming (upstream) traffic, not outgoing
(downstream).
The ATM traffic classes and parameters are identical with downstream shaping.
Upstream policing can control the upstream incoming traffic rate on specific PVCs.
Upstream ATM cell traffic that violates the policing profile will be discarded. Traffic
shaping must also be enabled on the subscriber's device in order to use upstream
policing. If a subscriber attempts to enlarge his device's PVC shaping parameters
in order to get more upstream traffic bandwidth, it will violate the IES-1248-51V's
upstream policing profile and the traffic will be discarded. Operators can use this
feature to prevent subscribers from changing their device settings.
Note: Traffic shaping must also be enabled on the subscriber's device in order to use
upstream policing.
Note that since the IES-1248-51V uses ATM QoS, if the subscriber device's
upstream shaping rate is larger than the IES-1248-51V's upstream policing rate,
some ATM cells will be discarded. In the worst case, none of the Ethernet packets
from the CPE will be able to be reassembled from AAL5, so no packets from the
subscriber's device can be received by the IES-1248-51V.
The upstream policing feature can be enabled/disabled per PVC. No matter which
ATM traffic class is used for the PVC's upstream traffic (CBR, VBR, or UBR), the
IES-1248-51V will drop any upstream traffic that violates the specified ATM VC
profile.
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