COMNET III CACI

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Parameter Name Sample Value Rate 1 151 (PCR value) Limit Burst 1 1 CLP Count 1 CLP=0+1 Rate 2 100 (SCR value) Limit Burst 2 20 CLP Count 2 CLP=0 Conformance GCRA 1 only Burst units Packets Set CLP use algorithm Table 6: Policing parameters for VBR PCR(CLP=0+1) and SCR(CLP=0) cell streams If tagging is not supported the conformance parameter should be set to Both GCRA and the set CLP parameter should be set to never. This will ensure that both GCRAs are used for conformance checking, albeit on different CLP streams. A cell has to pass both conformance tests to be transmitted, otherwise it is discarded. These settings correspond directly to the specification as outlined in section B.2.2.2. To map the PCR(CLP=0+1) & SCR(CLP=0+1) cell stream onto the <strong>COMNET</strong> <strong>III</strong> policing parameters, the following values should be set: Parameter Name Sample Value Rate 1 151 (PCR value) Limit Burst 1 1 CLP Count 1 CLP=0+1 Rate 2 100 (SCR value) Limit Burst 2 20 CLP Count 2 CLP=0+1 Conformance Both GCRA Burst units Packets Set CLP never Table 7: Policing parameters for the VBR PCR(CLP=0+1) & SCR(CLP=0+1) cell streams Recall that this version does not support cell tagging! 26
The remarks made under the previous section concerning the scope of these parameters with respect to the cell stream carry over. Both rate control and policing functions consider the entire cell stream generated by the source, regardless of the message instance. To perform these functions on message instances independently, make sure that messages generated by the source are non-overlapping, i.e. that their message delay does not exceed the message inter-arrival time. Similarly, performing both rate control and policing functions at the same source does not add additional functionality to the model, since the stream generated through rate control already conforms and hence the policing function should never tag / discard (provided the parameter sets for both rate control and policing are identical). The simulation results provide an indication of the QoS which can be expected under the modeled conditions. Again, the priority function should be used in presence of ABR or UBR traffic. Make sure however that the priority does not exceed the CBR priority. 27
Page 1 and 2: COMNET III Application Notes: Model
Page 3 and 4: Appendices……………………
Page 5 and 6: 2.2 Underlying Assumptions A number
Page 7 and 8: only those details which are signif
Page 9 and 10: Table 1 gives you an overview of th
Page 11 and 12: Network Interfaces Connection Admis
Page 13 and 14: 3.2 Overview of COMNET III’s Mode
Page 15 and 16: To generate ATM traffic, you would
Page 17 and 18: 3.2.3 Other Protocols over ATM The
Page 19 and 20: 3.4 Modeling CBR Services A fundame
Page 21 and 22: UPC/NPC conformance for the CBR tra
Page 23 and 24: 3.5 Modeling VBR Services To model
Page 25: Figure 5: VBR buffer limit. As illu
Page 29 and 30: control parameters as well as to ex
Page 31 and 32: In order for the RM cells to indica
Page 33 and 34: 3.7 Modeling UBR Services As descri
Page 35 and 36: For the FM functions, a distinction
Page 37 and 38: Bus Bus 1..n CPU Ports Ports Line C
Page 39 and 40: 4. Example Applications In the firs
Page 41 and 42: The particular QoS parameters of in
Page 43 and 44: CBR AAL1 VBR AAL3/4 ABR AAL3/4 Basi
Page 45 and 46: After running the model under both
Page 47 and 48: 4.2 TCP/IP vs. ATM at the Desktop T
Page 49 and 50: Note that she has decided to reduce
Page 51 and 52: The voice mail traffic is given the
Page 53 and 54: 4.3 Modeling ATM LANE Networks This
Page 55 and 56: The model topology consists of a nu
Page 57 and 58: Connected to the LES is a single CO
Page 59 and 60: Figure 17 depicts a modified model
Page 61 and 62: To model this architecture, COMNET
Page 63 and 64: The OFF command is a global process
Page 65 and 66: The respective connection utilizati
Page 67 and 68: A. Perspectives on ATM - Brief Revi
Page 69 and 70: This integration of the different n
Page 71 and 72: available, or it will accept to est
Page 73 and 74: Version 4.0 of the ATM Forum’s tr
Page 75 and 76: A.3 The B-ISDN Protocol Reference M
Page 77 and 78:
Class A B C D AAL Type AAL1 AAL2 AA
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Higher layer PDU (1-65535 bytes) Co
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Link 1 ATM Switch VCI = 1 Link 2 VP
Page 83 and 84:
FDDI ATM Router ATM Switch Private
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Input Ports Output Ports Figure 30:
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In addition to the internal switchi
Page 89 and 90:
B.1.1 Resource Management Policies
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Finally, the setup request is forwa
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intermediary node, the local CAC fu
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Arrival of a cell at time ta(k) X
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CLP value? 0 1 GCRA using PCR(CLP=0
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B.2.2.3 Available Bit Rate Conforma
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control scheme requires more compli
Page 103 and 104:
B.3 Management Services We will now
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In the second dimension, the OAM ce
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• SECBR = Severely Errored Cell B
Page 109 and 110:
Note that the node detecting the fa
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Glossary and Acronyms: The terms in
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NNI* nrt-VBR OAM cells PCR PDU* PT
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COMNET III CACI

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