RS8234 Mindspeed Technologies, RS8234 Datasheet - Page 79
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RS8234
Manufacturer Part Number
RS8234
Description
Atm Servicesar Plus With Xbr Traffic Management
Manufacturer
Mindspeed Technologies
Datasheet
1.RS8234.pdf
(401 pages)
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28234-DSH-001-B
4.0 Segmentation Coprocessor
4.1 Overview
ATM’s cell transport mechanism enables large numbers of virtual channels or
VCCs to be multiplexed onto a single physical interface. The segmentation
process converts user data (typically Ethernet, Token Ring, or Frame Relay
packets) into ATM cells.
coprocessor block independently segments each channel and multiplexes the
VCCs onto the line with cell level interleaving. The RS8234 xBR Traffic
Manager determines the order of execution of these independent processes to
ensure the requested QoS for every channel. For each cell transmission
opportunity, the xBR Traffic Manager tells the segmentation coprocessor which
VCC to send. Therefore, the segmentation coprocessor acts as a slave to the xBR
Traffic Manager.
generates all AAL overhead for AAL3/4 and AAL5, or optionally uses a null
adaptation layer, AAL0. The RS8234 also generates the ATM cell header, as
defined by the host, for each VCC. Furthermore, the segmentation coprocessor
and xBR Traffic Manager together provide service specific features to enhance
the performance of Frame Relay internetworking and LAN Emulation.
The RS8234 can segment 64 K VCCs simultaneously. The segmentation
In addition to converting blocked user data into ATM cells, the RS8234
Mindspeed Technologies
4
™
4-1
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