GENERAL DESCRIPTION
• The S/UNI-9953-POS is a single chip ATM, POS User-Network Interface operating at 9953.28 Mbit/s. The S/UNI 9953-POS is intended for use in OC-192c and high-density OC-48c POS/ATM applications.

FEATURES
• Supports framing, scrambling/
   descrambling and pointer processing
   for the following:
   • STS-192c (STM-64-64c).
   • 4 x STS-48c (4 x STM-16-16c).
   • STS-192 (STM-64) channelized
      down to STS-48c (STM-16c).
• Supports alarm signal
   insertion/detection, B1/2/3 processing
   and insertion/termination of SONET
   Section/Line/Path overhead bytes (or
   SDH equivalents).
• Provides ATM and POS payload
   processing for:
   • STS-192c (STM-64-64c)
   • 4 x STS-48c (4 x STM-16-16c).
   • STS-192 (STM-64) channelized
      down to STS-48c (STM-16c).

INTERFACES
• Provides SATURN® POS-PHY™
   Level 4 16-bit LVDS System-side
   Interface (clocked at 700 MHz
   nominal).
• Directly connects to optics via 16 bit by
   622 MHz OIF SFI-4 (OIF99.102) lineside interface.

POS/ATM
• Implements the ATM Forum User
   Network Interface Specification and
   the ATM physical layer for Broadband
   ISDN according to CCITT
   Recommendation I.432.
• Implements the Point-to-Point Protocol
   (PPP) over SONET/SDH specification
   according to RFC 2615(1619)/1662 of
   the PPP Working Group of the Internet
   Engineering Task Force (IETF).

GENERAL
• Provides internal FIFOs (16 KB
   ingress, 20 KB egress) to
   accommodate system latencies.
• Provides line-side and system-side
   loopbacks for system level diagnostic
   capability.
• Provides support for automatic
   protection switching (APS) via two 16-
   bit LVDS 777.76 MHz ports.
• Provides a generic 16-bit
   microprocessor bus interface for
   configuration, control and status
   monitoring.
• Standard 5 signal P1149.1 JTAG test port.
• Low power 1.8 V CMOS core logic with
   3.3 V CMOS/TTL compatible digital
   inputs and digital outputs.
• Industrial temperature range (-40 °C to
   +85 °C).
• 1152 pin FCBGA package.

APPLICATIONS
• Edge and Core Routers.
• Multi-Service (Multi-Protocol) Switches.
• SONET/SDH add/drop multiplexers and optical cross-connects.
• WAN and Edge ATM switches.
• Up-link cards.
• SONET/SDH ATM/POS test equipment.
• Emerging DPT, IPT and GFP applications.