Scalable Research & Education Networks
| Dr. Brian Smith, Senior Optical Systems Designer |
| Introduction. | |
| Review of Requirements for Research and Education Regional Optical Networks. | |
| Comparing Strategies for Regional Optical Networks. | |
| Towards seamless overlay of 10Gbps and 40Gbps traffic. |
| Regional Optical Networks for Research and Education are being built at an increasing rate | ||
| Acquisition of dark fiber – lit up as private networks | ||
| Some University focused – some joint education/government initiatives. | ||
| Large Scale Research Applications are driving the demand for dedicated bandwidth | ||
| Real time image sharing between collaborating institutions | ||
| Very Large Baseline Interferometry | ||
| Distributed supercomputer simulations | ||
| Interactive Video | ||
What features would be required in such a network ?
| Dynamic Provisioning | ||
| Fully reconfigurable wavelength node | ||
| Simple migration from ring to mesh networking. | ||
| Ability to switch light-paths using Central/Distributed Management workstation(s). | ||
| Single wavelength granularity add and drop. | ||
| Seamless switching between DWDM and CWDM providing cost effective multi-grid networks. | ||
| Bit rate and protocol transparency – universal interface to higher layers. | ||
| Traffic grooming down to ‘STS-1’ level for ultimate flexibility but with GFP for protocol transparency. | ||
| Simple and Cost-Effective | ||
| Transport platform that integrates WDM transmission, wavelength switching and SDH/SONET grooming. | ||
| Central or distributed management of all network elements. | ||
| Layer 1 performance monitoring at every node – fault isolation. | ||
| Auto discovery of nodes, cards and optical interfaces | ||
| Interface directly to existing GigE /10GigE routers/switches (carry 10GigE LAN PHY natively without expensive WAN PHY/SONET encapsulation). | ||
| Carry any service (Ethernet, SONET, SAN) at wire speed from Fast Ethernet to 10GigE and beyond. | ||
| Scalability | ||
| Add wavelengths ‘in-service’ with no impact on existing traffic. | ||
| Add wavelengths with no adjustments to network provisioning (amplifiers etc). | ||
| Seamless overlay of wavelengths carrying traffic up to 2.5G, 10G and 40G over the same fiber. | ||
| Allow addition of on-grid alien wavelengths. | ||
| Make full use of industry standard technologies such as SFP/XFP to reduce cost and complexity of sparing. | ||
7200 OADX –
Unique Product Architecture
OADM vs
OADX
Multi-Degree Support
OADM vs OADX
Multi-WDM Interface Support
OADM vs OADX
High Error Rate Protection Switching
OADM vs OADX
Adding Wavelengths
| OADM solutions address fiber exhaust needs but introduce difficult operational and engineering constraints | ||
| Serial Architecture Filter Design (Cascaded & Banded) | ||
| Result in Stranded Bandwidth | ||
| Serious Scaling Pains w/Re-engineering Required | ||
Capacity Upgrade – Line Amplifiers
OADM vs
OADX
Multi-Protocols Trib Card Support
Overlaying 10G and 40G traffic on existing networks
| The dispersion experienced over any km of fiber segment lies within a range defined by the manufacturer. |
Dispersion Tolerance (cont. .)
10G + 40G overlay on existing traffic
| With an appropriate adaptive DCM at the receiver and enhanced FEC, 40G traffic can be transmitted over a system designed to support 2.5 and 10G traffic. | |