RS8234EBGC Mindspeed Technologies, RS8234EBGC Datasheet - Page 52
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RS8234EBGC
Manufacturer Part Number
RS8234EBGC
Description
RS8234EBGC ATM XBR SAR
Manufacturer
Mindspeed Technologies
Datasheet
1.RS8234EBGC.pdf
(401 pages)
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2.0 Architecture Overview
2.5 Advanced xBR Traffic Management
2.5.6 xBR Cell Scheduler
2-20
The xBR Scheduler slates traffic for transmission according to a Dynamic
Schedule Table maintained in SAR shared memory. The table contains a
user-programmable number of schedule slots. The duration of a single slot is a
user-programmable number of system clock cycles. The xBR Scheduler
sequences through this table in a circular fashion to schedule traffic. By
configuring the number of slots in the table and the duration of each slot, the
system designer chooses a range of available rates. A specific rate for any channel
is determined by how many slots in the table to which that channel is assigned.
Schedule slots not reserved for CBR during table setup are used for the rest of the
service categories.
shaping algorithms. The predecessor to the RS8234, the Bt8230 SAR, proved the
core algorithms. The RS8234 extends their use to other service classes. The
RS8234 xBR Scheduler shapes all traffic classes, including CBR, single leaky
bucket VBR, dual leaky bucket VBR, ABR, and UBR. The host configures the
Dynamic Schedule Table during system initialization, defining the table size in
number of schedule slots and the length of each schedule slot in clock cycles.
After setup, the RS8234 dynamically manages the entire table.
without host intervention. The RS8234 fairly distributes the link bandwidth to
channels based upon their QoS parameters and assigned transmission priority. As
covered previously, the RS8234 supports 16 priorities in addition to preallocated
CBR time slots.
topologies. The RS8234 rate shapes VCs or VPs. Additionally, CBR tunneling
allows UBR, VBR and/or ABR traffic management schemes to operate under a
preallocated CBR limit.
The xBR Scheduler implements Mindspeed’s proprietary per-VCC rate
Some key features of the xBR Scheduler are:
1.
2.
3.
4.
5.
6.
Dynamic management provides on-the-fly reallocation of link bandwidth
The xBR Scheduler facilitates advanced network traffic management
Per-VCC rate control guarantees conformance to GCRA UPC/policing
Dynamic reallocation of link bandwidth to active channels
Dynamic, fair sharing of bandwidth on oversubscribed lines
Multiple scheduling priorities
Fine grained rate control
Rate based on a user supplied reference clock
Mindspeed Technologies
ATM ServiceSAR Plus with xBR Traffic Management
™
28234-DSH-001-B
RS8234
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