cn8237 Mindspeed Technologies, cn8237 Datasheet - Page 168

• Manufacturer Part Number: cn8237
• Description: Atm Oc-12 Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

6.0 Traffic Management
6.2 xBR Cell Scheduler Functional Description
Figure 6-6. One Possible Scheduling Priority Scheme with the CN8237
6-12
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 CN8237 affords system designers and network administrators.
slots. In this illustration, the number of VBR/ABR priorities = 4. In addition, the
tunnel at PRI = 5 has VBR traffic (CBR_TUN = 1, SLOT_DEPTH = 010). 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
VBR_OFFSET + (# of VBR / ABR priorities) < 15
CBR
(Unused)
illustrates how scheduling priorities are assigned in scheduling
UBR1
UBR2
UBR3
(VBR/ABR Priority 3)
(VBR/ABR Priority 2)
(VBR/ABR Priority 1)
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
(VBR Priority 4)
(VBR Priority 4)
™
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
28237-DSH-001-C
CN8237
8237_061