9.9 to 12.5 Gbps 16:1 Multiplexer with Clock Multiplier Unit and Demultiplexer

with Clock Recovery Chip Set

VSC1237, VSC1238

The VSC1237 and VSC1238 is a complete high-

performance multiplexer/demultiplexer chip

set designed for 9.9-12.5 Gbps applications,

including SONET OC-192, SDH STM-64,

10GbE, G.975, G.709 and offering enhanced

capabilities specifically designed to address the needs of Ultra Long

Haul (ULH) and Long Haul (LH) fiber optic transmission systems.

Multiplier Unit. This device easily surpasses the jitter requirements

for SONET/SDH transmission systems. Integrated phase locked loop

circuits, including VCOs, are used for high speed clock generation,

jitter filtering and low-speed data transfer.

This device offers

enhanced features, such as a integrated jitter filter PLL and a

selectable full/half-rate clock output, which is specifically designed to

be used in long haul and ultra long haul systems that utilize clocked

laser drivers or RZ signaling. The clock output features extremely low

clock-data skew variation, and can be disabled to save power.

Recovery (CDR) unit. This device is capable of direct recovery of

signals which are subject to various impairments/formats inherent in

ULH/LH systems, including poor Optical Signal to Noise Ratio (OSNR)

arising from optical amplification, distortion from Chromatic

Dispersion, Polarization Mode Dispersion / Differential Group Delay

(PMD/DGD), and RZ signaling. The highly sensitive front-end, precise

phase detector / decision circuit, and adaptive threshold features

eliminate the need for AGC amplifiers, post-amplifiers, filters, etc.

which are traditionally needed to recover these signals.

GENERAL DESCRIPTION:

741 Calle Plano

Camarillo, CA 93012, USA

Tel: +1 805.388.3700

Fax: +1 805.987.5896

www.vitesse.com

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

©2004 Vitesse Semiconductor Corporation

Vitesse, ASIC-Friendly, FibreTimer, TimeStream and Snoop Loop are trademarks of Vitesse Semiconductor Corporation.

All other trademarks or registered trademarks mentioned herein are the property of their respective holders. Vitesse

Semiconductor Corporation ("Vitesse") retains the right to make changes to its products or specifications to improve

performance, reliability or manufacturability. All information in this document, including descriptions of features,

functions, performance, technical specifications and availability, is subject to change without notice at any time.

BLOCK DIAGRAMS:

VSC1237

VSC1238