cx28365 Mindspeed Technologies, cx28365 Datasheet - Page 15

• Manufacturer Part Number: cx28365
• Description: X12, X6, X4 T3/e3 Framer And Atm Cell Transmission Convergence Sublayer Processor
• Manufacturer: Mindspeed Technologies

1.0 Product Description
The CX2836x provides up to twelve DS3/E3 framers, each integrated with ATM
physical layer processing functions. The framers support DS3-M13, DS3-C-bit parity,
E3-G.751, and E3-G.832 transmission formats. Access is provided to the FEAC and
TDL channels. The CX2836x integrates all the ATM Layer processing functions
found in the ATM Forum Cell-Based Transmission Convergence Sublayer
specification (af-phy-0043.000) in each of the twelve ports. The ATM cell processor
is also referred to as the cell delineator. A UTOPIA Level 2 Multi-PHY interface
connects the device to the host switch or terminal system and concentrates the ATM
cell traffic onto a single bus interface.
Although designed primarily for DS3/E3 line applications, the ATM cell processor
can be individually bypassed. Each port may be configured for operation at speeds
from 64 Kbps to 52 Mbps, allowing a maximum aggregate bandwidth of 624 Mbps.
Typical system implementations center around the concentration of multiple standard
data rates such as T1 and E1 lines, DS3 and E3 lines, and multiple Digital Subscriber
Line (DSL) formats such as HDSL, ADSL or VDSL. For each specific format,
external devices perform the appropriate PMD (physical media dependant) layer
functions and present the CX2836x with a payload bit stream. The CX2836x then
performs all cell alignment functions on that bit stream. This gives system designers a
simple, modular, and low-cost architecture for supporting all ATM interfaces below
52 Mbps. It also enables them to select the most integrated framer and LIU available,
or reuse existing devices and software.
If the cell processor is bypassed, all framer signals are available, and the framer can be
used as a standalone DS3/E3 framer. The CX2836x device allows for ease of
configuration, while providing maximum flexibility to support the transmission and
recovery of industry standard formats. It provides a flexible opportunity bit generation
method to source Opportunity bits on an individual framer.
Mindspeed Technologies™
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500028C
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Preliminary Information/Mindspeed Proprietary and Confidential