RS8234EBGC Mindspeed Technologies, RS8234EBGC Datasheet - Page 162

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

Table 6-1. ATM Service Category Parameters and Attributes (2 of 2)
6.0 Traffic Management
6.1 Overview
6-2
max Cell Transfer Delay (CTD)
Cell Loss Ratio (CLR)
Feedback
NOTE(S):
(1)
variation, as would be appropriate for voice and video applications.
(2)
(3)
variation. Examples of such applications are traditional computer communications applications, such as file transfer and e-mail.
(4)
(5)
to the source in order to control the source transmission rate in response to changing ATM layer transfer characteristics.
The rt-VBR service category is intended for real-time applications; i.e., those requiring tightly constrained delay and delay
The nrt-VBR service category is intended for non-real-time applications which have bursty traffic characteristics.
The UBR service category is intended for non-real-time applications which do not require tightly constrained delay and delay
This is a network parameter. The RS8235 provides counters that monitor this parameter.
Feedback refers to the several types of control cells called Resource Management Cells (RM cells), which are conveyed back
OTHER ATTRIBUTES:
(5)
Attribute
segmentation on each active VCC by controlling the segmentation coprocessor.
By intelligently selecting when each VCC transmits a cell, the Traffic Manager
guarantees that the output of the RS8234 conforms to the negotiated traffic
contract. This selection process (called Scheduling) executes dynamically, based
upon per-VCC parameters.
the Dynamic Cell Scheduler, which provides for CBR, VBR, UBR, and GFR
traffic. Second, for ABR service classes, is the ABR Flow Control Manager, an
additional state machine, which works in conjunction with the xBR Cell
Scheduler.
achieve full rate performance – one which reacts to feedback from the network
and adjusts cell transmission accordingly. This specification models ABR to align
with the TM 4.1 ABR specification. The RS8234 supports the rate based flow
control and service models specified for ABR in TM 4.1.
complements the GFC algorithm by allowing switches to significantly
overallocate port bandwidth.
In order to supply these services, the xBR Traffic Manager directs the
The xBR Traffic Manager consists of two primary components. The first is
Due to the complexities of ABR, a dedicated state machine is required to
The RS8234 also provides Generic Flow Control. This XON/XOFF protocol
CBR
Mindspeed Technologies
Supported
Supported
rt-VBR
(4)
(1)
(4)
ATM Layer Service Category
nrt-VBR
ATM ServiceSAR Plus with xBR Traffic Management
(2)
™
Supported
UBR
Not
4)
Not Supported
(3)
(
Supported
Supported
ABR
(4)
4)
28234-DSH-001-B
(
Supported
GFR
Not
RS8234
4)
(