RS8234EBGC Mindspeed Technologies, RS8234EBGC Datasheet - Page 170

• Manufacturer Part Number: RS8234EBGC
• Description: RS8234EBGC ATM XBR SAR
• Manufacturer: Mindspeed Technologies

6.0 Traffic Management
6.2 xBR Cell Scheduler Functional Description
Figure 6-6. One Possible Scheduling Priority Scheme with the RS8234
6-10
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, which demonstrate the range of flexibility
that the RS8234 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
be accessible by 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
As mentioned before, the VBR/ABR priorities must be contiguous in order to
Scheduling Priority
VBR1
VBR2
ABR
Mindspeed Technologies
CBR
(Unused)
illustrates how scheduling priorities are assigned in scheduling
UBR1
UBR2
UBR3
VBR_OFFSET + (# of VBR/ABR priorities)
(UBR & VBR shared)
(VBR/ABR Priority 3)
(VBR/ABR Priority 2)
(VBR/ABR Priority 1)
(UBR Only)
ATM ServiceSAR Plus with xBR Traffic Management
™
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
<
15
28234-DSH-001-B
RS8234
100074_045