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AAM1212-51/53 Series User’s Guide
124
Chapter 14 xDSL Profiles Setup
14.3.2.5 Burst Tolerance (BT)
Burst Tolerance (BT) is the maximum number of cells that the port is guaranteed to handle
without any discards. BT controls the time scale over which the SCR is enforced. BT is used to
determine if a cell arrived too early in relation to SCR. Use this formula to calculate BT: (MBS
– 1) x (1 / SCR – 1 / PCR) = BT.
14.3.2.6 Theoretical Arrival Time (TAT)
The Theoretical Arrival Time (TAT) is when the next cell (in an ATM connection’s stream of
cells) is expected to arrive. TAT is calculated based on the PCR or SCR.
The following figure illustrates the relationship between TAT, CDVT and BT. If a cell arrives
at time A, then according to PCR or SCR, the next cell is expected to arrive 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 59
TAT, CDVT and BT in Traffic Shaping
14.4 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
AAM1212.
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 AAM1212's upstream policing profile and the traffic will be
discarded. Operators can use this feature to prevent subscribers from changing their device
settings.
Содержание AAM1212-51
Страница 1: ...AAM1212 51 53 ADSL2 module of IES 1000 User s Guide Version 3 52 Edition 1 8 2006...
Страница 2: ...AAM1212 51 53 Series User s Guide 2...
Страница 24: ...AAM1212 51 53 Series User s Guide 24 Table of Contents...
Страница 36: ...AAM1212 51 53 Series User s Guide 36 List of Tables...
Страница 54: ...AAM1212 51 53 Series User s Guide 54 Chapter 3 Front Panel...
Страница 61: ...AAM1212 51 53 Series User s Guide Chapter 4 Introducing the Web Configurator 61 Figure 21 Logout...
Страница 62: ...AAM1212 51 53 Series User s Guide 62 Chapter 4 Introducing the Web Configurator...
Страница 68: ...AAM1212 51 53 Series User s Guide 68 Chapter 5 Initial Configuration...
Страница 84: ...AAM1212 51 53 Series User s Guide 84 Chapter 7 System Information...
Страница 90: ...AAM1212 51 53 Series User s Guide 90 Chapter 9 User Account...
Страница 96: ...AAM1212 51 53 Series User s Guide 96 Chapter 10 Switch Setup...
Страница 98: ...AAM1212 51 53 Series User s Guide 98 Chapter 11 IP Setup...
Страница 100: ...AAM1212 51 53 Series User s Guide 100 Chapter 12 ENET Port Setup...
Страница 132: ...AAM1212 51 53 Series User s Guide 132 Chapter 14 xDSL Profiles Setup...
Страница 140: ...AAM1212 51 53 Series User s Guide 140 Chapter 15 xDSL Line Data...
Страница 148: ...AAM1212 51 53 Series User s Guide 148 Chapter 16 VLAN...
Страница 166: ...AAM1212 51 53 Series User s Guide 166 Chapter 19 Multicast VLAN...
Страница 190: ...AAM1212 51 53 Series User s Guide 190 Chapter 26 DHCP Snoop...
Страница 198: ...AAM1212 51 53 Series User s Guide 198 Chapter 27 2684 Routed Mode...
Страница 204: ...AAM1212 51 53 Series User s Guide 204 Chapter 28 PPPoA to PPPoE...
Страница 220: ...AAM1212 51 53 Series User s Guide 220 Chapter 33 Syslog...
Страница 228: ...AAM1212 51 53 Series User s Guide 228 Chapter 34 Access Control...
Страница 238: ...AAM1212 51 53 Series User s Guide 238 Chapter 36 Alarm...
Страница 246: ...AAM1212 51 53 Series User s Guide 246 Chapter 38 Diagnostic...
Страница 270: ...AAM1212 51 53 Series User s Guide 270 Chapter 41 Commands...
Страница 278: ...AAM1212 51 53 Series User s Guide 278 Chapter 42 Command Examples...
Страница 286: ...AAM1212 51 53 Series User s Guide 286 Chapter 43 Alarm Commands...
Страница 328: ...AAM1212 51 53 Series User s Guide 328 Chapter 48 Packet Filter Commands...
Страница 334: ...AAM1212 51 53 Series User s Guide 334 Chapter 49 IP Commands...
Страница 344: ...AAM1212 51 53 Series User s Guide 344 Chapter 51 SNMP...
Страница 380: ...AAM1212 51 53 Series User s Guide 380 Chapter 52 ADSL Commands...
Страница 406: ...AAM1212 51 53 Series User s Guide 406 Chapter 53 Virtual Channel Management...
Страница 412: ...AAM1212 51 53 Series User s Guide 412 Chapter 54 ACL Commands...
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