RS8234EBGC Mindspeed Technologies, RS8234EBGC Datasheet - Page 112
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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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5.0 Reassembly Coprocessor
5.3 CPCS-PDU Processing
Figure 5-6. CPCS-PDU Reassembly
5-8
CPCS-PDU
(For a
Specific VCC)
ATM Cells
(Hdr)
BOM Cell
(Payload)
5.3 CPCS-PDU Processing
After the VCC has been identified via channel lookup, the reassembly
coprocessor performs the appropriate CPCS-PDU processing according to the
AAL_TYPE field in the reassembly VCC table.
consecutive ATM cell payloads on a specific VCC to form a CPCS-PDU. This
processing is either reassembly into an AAL5 PDU, according to the specification
in ANSI T1.635, reassembly into an AAL3/4 PDU, or reassembly into a
transparent AAL0 PDU. The exact process is governed by the AAL type
described in detail in the subsections below.
SETUP
Each active reassembly VCC must have a corresponding entry in the reassembly
VCC table to describe its state. At channel setup time — either during system
initialization for Provisioned Virtual Connections (PVCs), or dynamically for
Switched Virtual Connections (SVCs) — the host allocates a reassembly VCC
table entry and configures the VCC according to its provisioned or negotiated
characteristics. This includes the AAL in use, its assigned buffer pools and
allocation priority, as well as the associated segmentation VCC Index
(SEG_VCC_INDEX) for full duplex connections.
OPERATION
Once the reassembly process is activated, this RSM VCC table entry will be used
to track the current state of the connection and direct the RS8234 to perform
specific functions as described throughout this chapter.
The reassembly process is essentially the extraction and concatenation of
Figure 5-6
Mindspeed Technologies
illustrates the basic process function.
(Hdr)
COM Cells . . .
(Payload)
ATM ServiceSAR Plus with xBR Traffic Management
™
. . .
. . .
(Hdr)
EOM Cell
(Payload)
28234-DSH-001-B
RS8234
100074_027
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