ETHOS: Ethernet over SDH/SONET

System on Chip for standalone and protected SDH/SONET system applications

Overview

ETHOS is a system-on-chip that provides all functions for a hybrid SDH/SONET and data multiplexer/mapper, and provides full-rate GbE transport over SDH/SONET.

Typical applications include SDH/SONET network terminator with Ethernet and PDH access interfaces at customer premises as well as SDH/SONET aggregation systems with DS1 or E1 interfaces or interface cards in telecom or datacom equipment.

Interfaces

  • 2 x STM-1/OC-3, STM-4/OC-12 multi-rate line interfaces
  • 2x STM-1/OC-3 fixed-rate tributary interfaces
  • Glueless interfaces to hotpluggable SFP modules
  • 4x E1/DS1
  • 4x Gigabit Ethernet or Fast Ethernet
  • Telecom bus, 19.44MHz, 8 bit interface
  • 2MHz, 2Mbit and DS1 timing output

Features

  • 19x19 AU-4, 57x57 STS-1 high order cross connect
  • 14 x 14 VC-12/VT-1.5/VC-3 low order cross connect (VC-4 equivalents)
  • Full support for SDH/SONET pointer processing, overhead termination and protection schemes
  • Up to 4 Virtual Concatenation groups for flexible Ethernet transport
  • Lower order groups supporting a total capacity of 9 VC-3s, 126 VC-12s or 126 VT-1.5s
  • VC-3-Xv (X=1..9)
  • VC-12-Xv (X=1..63)
  • VT1.5-Xv (X=1..63)
  • Higher order groups supporting a total capacity of 8 VC-4s or 24 STS-1s
  • VC-4-Xv or STS-3c-Xv (X=1..8)
  • STS-1-Xv (X=1..24)
  • Interface to external memory for up to 128msec differential delay compensation
  • Low-latency and hitless LCAS (G.7042)
  • GFP, LAPS and PPP mapping of Ethernet frames
  • Jumbo frame support and flow control over 80km of 1000BASE-X fibre with optional external memory
  • Ingress and egress rate controller per channel, from 0 up to 1000 Mbit/s, in steps of 100kbit/s
  • Ethernet to Ethernet local cross connect with MAC frame insert/extract to CPU (Managed Ethernet NT or media converter applications)
  • Flexible xMII interface supporting various PHY devices and MMI management interface
  • Access to DCC overhead channels
  • 32 bit interface to PowerPC CPU
  • Completely integrated G.813 SEC / ETHOS used in stand-alone application GR-1244 Stratum-3 network Element clock timing reference generation, selection and distribution functions from a single oscillator
  • HDLC based In-band management channels (IMC) via P12 (2Mbit/s) or P11 (DS1)
  • Integrated HDLC controller and internal packet memory for 4 DCC IMC serial channels

Technology and Package

  • 0.18µm CMOS technology
  • 2.5V / 3.3V power supply
  • 756-pin BGA
  • Total power consumption < 5W

Applications

  • Access equipment for Ethernet, Fast Ethernet, Gigabit Ethernet, E1 and DS1
  • OC-12/STM-4 network termination
  • Slide-in unit for E1/DS1 and 2 x 622 Mbit/s Ethernet access in protected Protection SDH/SONET ADM or MSPP
  • Small SDH/SONET Add/Drop multiplexer

ETHOS used in stand-alone application

ETHOS used on a slide-in unit in a protected SDH/SONET system

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ETHOS product brief (pdf)