VITESSE VSC9210 Datasheet
2.5Gb/s SONET/SDH FEC Encoder and Decoder
Optical
Transport
Networking
Features:
• Reed Solomon RS(255,241)
Codec
• Bit Error Rate Improvement
from 10
• Includes Optical Channel
Overhead (OCh-OH) of 10Mb/s
• Provides Bit Error Rate
Monitoring of FEC Line
5
to 10
20
VSC9210
Product Brief
• Processes Data Rates up to
2.654Gb/s and Information
Rates to 2.488Gb/s
• Provides a Dedicated User
Defined Data Channel at
10.368Mb/s
Benefits:
• Device Pin Configured as
Stand-alone Encoder, Decoder,
or Bypass with Cocks Disabled
• Provides Count of Correctable
0’s and 1’s that are in Error in
Prior Code Word
• Interfaces Directly with Vitesse
OC-48 Rate Components
Product Description
The VSC9210 provides forward error
correction for any data rate and protocol operating up to 2.5Gb/s using a
block oriented Reed-Solomon Forward Error Correction (FEC) algorithm
RS(255,241). The device can be configured as a FEC encoder or a FEC
decoder utilizing two 16-bit differential PECL I/O ports to interface with
an external high speed multiplexer/
demultiplexer pair. Clock dividers are
provided on chip to facilitate control
of external PLL circuitry.
For the Encoder, the 1:16
Demultiplexer is used to convert the
incoming 2.5Gb/s STS-48 information
to a 16 bit parallel data at 155MHz to
interface with the VSC9210. After the
encoding process, the 16 bit parallel output data from the VSC9210 is obtained
at 165MHz and is converted to a
2.65Gb/s data stream using the 16:1
Multiplexer. In the case of the Decoder
configuration, the Demultiplexer operates on a 2.65Gb/s data stream while
the Multiplexer provides the 2.5Gb/s
STS-48 information stream. Clock dividers are incorporated within the
VSC9210 to provide control of an external PLL circuit for synthesizing the
necessary reference clock for the Multiplexer. In the case of the Bypass mode,
the input and output rates are identical
and both the Multiplexer and
Demultiplexer operate at 2.5Gb/s.
www.vitesse.com
Telecom Division
2.5Gb/s SONET/SDH FEC Encoder and Decoder
Product Brief
Specifications:
• Operable at OC-48, OC-12,
OC-3 Rates
• 16-Bit PECL Input/Output Bus
• 3.3.V Power Supply
• Telecom Temperature Range:
0°- 85°C Case
• Thermally Enhanced 208-pin
PQFP Package
VSC9210
VSC9210 Block Diagram
Overhead
I/O Port
Demux
Interface
16-bit 156 Mbps
RS
CODEC
Optical
Transport
Networking
Error Monitor
Interface
Mux
Interface
16-bit 166 Mbps
The User Channel is an 8 bit TTL
interface operating at 1.296MHz resulting in an aggregate data rate of
10.368Mb/s. This data channel is
encoded and decoded along with the
16-bit STS data, i.e. errors occurring
in this User Channel are also corrected.
For more information on Vitesse Products visit the Vitesse web site
at www.vitesse.com or contact Vitesse Sales at (800) VITESSE or
sales@vitesse.com
The VSC9210 can be operated at or
below unencoded and encoded data
rates of 155Mb/s and 165Mb/s respectively. The ratio of the two input
clocks (INCLK and OUTCLK) must be
15/16 for Encoder operation, and 16/
15 for Decoder operation.
www.vitesse.com
© Copyright 2000 Vitesse Semiconductor Corporation
and the Vitesse logo
of Vitesse Semiconductor Corp;oration
are all registered trademarks
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