CN8236EBGB Mindspeed Technologies, CN8236EBGB Datasheet - Page 181
CN8236EBGB
Manufacturer Part Number
CN8236EBGB
Description
ATM SAR 155Mbps 3.3V ABR/CBR/GFR/UBR/VBR 388-Pin BGA
Manufacturer
Mindspeed Technologies
Datasheet
1.CN8236EBGB.pdf
(443 pages)
Specifications of CN8236EBGB
Package
388BGA
Traffic Class
ABR|CBR|GFR|UBR|VBR
Utopia Type
Level 1|Level 2
Host Interface
PCI
Maximum Data Rate
155 Mbps
Typical Operating Supply Voltage
3.3 V
Minimum Operating Supply Voltage
3 V
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CN8236
ATM ServiceSAR Plus with xBR Traffic Management
Figure 6-6. One Possible Scheduling Priority Scheme with the CN8236
28236-DSH-001-B
Scheduling Scenarios
VBR_OFFSET
High
= 1
6.2.2.5 Some
Low
15
7
6
5
4
2
1
0
8
3
This section discusses a few examples of scheduling priority schemes that system
designers may decide to implement. These examples demonstrate the range of
flexibility that the CN8236 affords system designers and network administrators.
slots. In this illustration, the number of VBR/ABR priorities = 3. In addition, the
tunnel at PRI = 5 has shared VBR traffic. CBR_TUN = 1, SLOT_DEPTH = 001.
The highest VBR/ABR scheduling priority (PRI) is 5. Thus, VBR_OFFSET = 1.
Reserved for Tunnel 2
VBR_OFFSET. To ensure that these priorities remain contiguous when accessed
by VBR_OFFSET, the following condition must be met:
Reserved for Tunnel 1
Figure 6-6
The VBR/ABR priorities must be contiguous in order to be accessible by
Scheduling Priority
VBR1
VBR2
ABR
Mindspeed Technologies
CBR
(Unused)
illustrates how scheduling priorities are assigned in scheduling
UBR1
UBR2
UBR3
VBR_OFFSET
(UBR & VBR shared)
(VBR/ABR Priority 3)
(VBR/ABR Priority 2)
(VBR/ABR Priority 1)
(UBR Only)
+
(# of VBR ABR priorities)
™
6.2 xBR Cell Scheduler Functional Description
nrt-VBR — Frame Relay/ABR MCR
Tunnel through private ATM Network
Tunnel through public ATM Network
(Scheduling Priorities 8 thru 15
ABR>MCR — LAN Data Traffic
Voice — AAL1 on AAL0 VCCs
High Priority UBR User Traffic
Low Priority UBR User Traffic
are not used in the scheme.)
Signalling, ILMI, PNNI Traffic
Service/Application
rt-VBR — Video
6.0 Traffic Management
15
8236_038
6-13
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