STATUS: June 5th 2014
|PMC-Sierra||Enabling OTN Switching over Packet/Cell Fabrics
OTN switching delivers a cost-effective, scalable, low-latency switching layer to address the massive bandwidth scaling required to deal with packet traffic growth. Furthermore, it delivers this scale in such a way that it can transparently transport legacy services such as TDM concurrent with the packet traffic. Service providers are demanding converged packet/OTN boxes, often referred to as Packet Optical Transport Platforms (P-OTPs), which support high-capacity OTN switching as well as packet functions such as Ethernet statistical multiplexing and MPLS-TP switching. TDM traffic is traditionally switched over a TDM-optimized switch fabric, and packet is traditionally switched over a packet/cell fabric. Maintaining two fabrics is challenging in terms of cost, power, and operational complexity. This white paper discusses how OTN switching can be accomplished over a converged fabric which also natively supports packet switching.
|PMC-Sierra||Swizzle FEC for 40G and 100G Optical Transmission
The introduction of OTU3 at 40G and OTU4 at 100G has put a great deal of pressure on SNR budgets. A strong FEC is the most economical way of regaining some of the link budget. The “Swizzle” Spiral Interleaved Turbo Forward Error Correction code is PMC-Sierra’s third-generation FEC designed to meet the needs of 40G and 100G DWDM systems. It offers 9.45dB of net coding gain with the standard 6.7% OTN overhead, 1.35dB better than the second-generation FECs captured in G.975.1
|PMC-Sierra||Improving Clock Performance in Base Stations
As base station architectures shift towards multi-standard, multi-carrier Remote Radio Heads and Active Antenna Modules, system designers are being challenged to reduce cost, power, and area while increasing the number of clocks in the system and still meeting all standards-based requirements. To meet stringent clock specifications, currently deployed systems often include additional filtering or costly discrete clocking components, which is often a sub-optimal trade-off between system performance and circuit cost, area, and power consumption.
|PMC-Sierra||Tutorial on ITU-T G.709 Optical Transport Networks (OTN)
The SONET/SDH network that has grown to be the backbone of most of the modern telecommunications network was originally designed for optical interfaces that used a single wavelength per fiber. As optical component technology has advanced, it has become more economical to transmit multiple SONET/SDH signals over the same fiber using wavelength division multiplexing (WDM) rather than going to a higher rate SONET/SDH signal. Based on experience with the SONET/SDH networks, the ITU-T defined a transport network that was optimized for cost-effective transparent transport of a variety of client signals over WDM networks. The optical transport network (OTN) architecture is specified in ITU-T Rec. G.872 and the frame format and payload mappings are specified in G.709.
|PMC-Sierra||Enabling OTN Convergence
Transport networks worldwide are steadily evolving from a pure SONET/SDH-centric infrastructure to one that better supports packet traffic. This white paper outlines the motivation behind the transport network’s evolution to adopt OTN and describes the architectures of new network elements required, including the Packet Optical Transport Platform (P-OTP). The paper explores relevant standards that apply to these architectures. It also discusses specific requirements and design elements for the Original Equipment Manufacturer (OEM) to consider when evaluating technology to implement these architectures. The white paper concludes with an introduction to PMC’s family of OTN products, a chip set of highly integrated components designed to address critical requirements in the next generation Packet Optical Transport Network (P-OTN).
|PMC-Sierra||Using GPON in Mobile Backhaul Networks
This document describes how GPON technology addresses the need for increased bandwidth, scalability and reliability in mobile backhaul networks while providing lower capital and operation expenses, backwards compatibility, and an easy migration path to an all-IP network.
|PMC-Sierra||Transporting Sub-ODU1 Rate Signals in the OTN
The OTN brings the potential for a simplified transparent transport network that can ultimately replace SONET/SDH at Layer 1. In order to do this, however, the OTN must be capable of carrying a number of important legacy, including GE and SONET/SDH, and emerging client signals with sub-ODU1 rates, including SAN and native video signals. This white paper summarizes the different approaches that have been considered for transporting sub-ODU1 client signals. While one approach, the ODU0, has been standardized by the ITU-T, it will be many years before ODU0 support is available in the OTN. The need exists for alternative methods that can be deployed in the meantime, and also to support important long term applications. This white paper describes the alternatives for sub-ODU1 rate client signal transport, and the applications for each.
|PMC-Sierra||The Importance of Dynamic Bandwidth Allocation in GPON Networks
This article describes Bandwidth Allocation in the PON network and highlights the advantages of Dynamic Bandwidth Allocation (DBA). A well-defined DBA algorithm can significantly improve network performance, provide a means of flexibly tailoring network responsiveness and enable a service provider to generate more revenue from their FTTH networks without boosting raw bandwidth by increasing the percentage of acceptable oversubscription.