RS8234EBGC Mindspeed Technologies, RS8234EBGC Datasheet - Page 13

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

RS8234
ATM ServiceSAR Plus with xBR Traffic Management
28234-DSH-001-B
VBR Traffic Management
The RS8234 schedules each VBR VCC according to GCRA parameters stored in
the individual VCC control tables. The internal xBR Traffic Manager schedules
the transmitted data to maximize the permitted link utilization. The actual rate
sent is accurate to within 0.15% of the negotiated rates over a range from 10 cells
per second to full line rate of 155 Mbits/sec.
Virtual Path Networking
The RS8234 can interleave segmentation of numerous VCCs (i.e., separate VC
channels) as members of one Virtual Path (VP). VP-based traffic shaping is
supported. The entire VP is scheduled according to parameters for one VCC.
AAL for Proprietary Traffic
The RS8234 incorporates an AAL0 traffic class for both segmentation and
reassembly, which acts as an AAL level for proprietary use. Several options for
packetization are implemented.
Optional Local Processing of ATM Management Traffic
The RS8234’s Local Processor Interface allows for an optional local processor to
direct segmentation and reassembly of ATM management level traffic, such as
Operations and Maintenance (OAM) cells, Performance Monitoring (PM) cells,
signalling, and Interim Local Management Interface (ILMI) traffic. This
off-loads network control traffic from the host, thereby focusing host processing
power on the user application.
Internal SNMP MIB Counters
RS8234 has three internal counters that measure cells received, cells discarded,
and AAL5 PDUs discarded (to meet ILMI and RFC1695 requirements).
• New per-VCC MCR and ICR fields reduce the number of ABR templates
• The RS8234 allows rate adjustments on Turnaround RM cells, based on
• The RS8234 allows rate adjustments due to Use-It-Or-Lose-It behavior.
• The RS8234 generates out-of-rate Forward RM cell(s) to restart
• The RS8234 optionally posts the current Allowed Cell Rate (ACR) on the
Three VBR modes are supported:
• Sustained cell rate (one leaky bucket)
• Peak and sustained cell rate (dual leaky bucket)
• CLP 0+1 shaping (supports committed/best effort services)
be tuned for different network policies.
needed in local memory.
congestion in the host.
scheduling of a VCC whose rate has dropped below the Schedule Table
minimum rate.
segmentation status queue for the host monitoring functions.
(This is the mode recommended by the Internet Engineering Task Force
[IETF] as the most convenient model for IP over ATM interworking.)
Mindspeed Technologies
1.2 Service-Specific Performance Accelerators
™
1.0 RS8234 Product Overview
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