Welcome to the Cisco Networking Professionals Ask the Expert conversation. This is an opportunity to discuss Cisco Optical Infrastructure Solutions for Cable Multi Service Operators with Cisco expert Duane Webber. Duane is a Market Development Manager at Cisco Systems, Inc. He currently has Market Development responsibilities for the Optical Team. Prior to joining Cisco Duane worked in Design Engineering and Technical Marketing at Intel Corporation. Duane holds an MSEE from the University of Southern California. Remember to use the rating system to let Duane know if you have received an adequate response.
Duane might not be able to answer each question due to the volume expected during this event. Our moderators will post many of the unanswered questions in other discussion forums shortly after the event. This event lasts through February 13. Visit this forum often to view responses to your questions and the questions of other community members.
Networks may be converged at multiple layers, including the wavelength, SONET, Ethernet, and IP layers. For high-bandwidth traffic where traffic aggregation at the Ethernet layer does not gain bandwidth efficiencylarge amounts of Gigabit Ethernet video-on-demand (VoD) traffic, for exampleit is beneficial to converge the network at the wavelength layer. When including TDM (DS-1 and DS-3) and OC-n traffic, convergence at the SONET layer is beneficial. For traffic such as voice over IP (VoIP) and high-speed data (HSD), the network can first be converged at the IP layer to provide these IP services and subsequently converged at the Ethernet layer where bandwidth optimization can be beneficial.
What protocols does the Cisco optical infrastructure support independent of the transport protocol embedded in the wavelength?
The Cisco ONS 15454 Multiservice Transport Platform (MSTP) provides access to the dense wavelength-division multiplexing (DWDM) layer from transponders that convert the incoming signal to the proper ITU-T wavelength and provide G.709 standard encapsulation for the following client protocols:
* 1-Gbps Ethernet
* 10-Gbps Ethernet
Encapsulation of the client protocol into G.709 ensures independent transport of the wavelength from the ingress port of the DWDM layer to the egress port of the DWDM layer with the ability of monitoring the wavelength.
For most VoD architectures, the added cost of muxponding is not necessary because it incurs extra cost at the distribution hubs. As the network grows, the cost benefits of implementing muxponding are minimal.
Why is Digital Video Broadcast-Access Server Integration (DVB-ASI) not supported on the multiservice transport platform (MSTP)?
Although DVB-ASI is an important interface for existing broadcast video, the majority of customers that Cisco Systems® is working with for high-growth VoD applications are moving to Gigabit Ethernet transport. Cisco® is therefore focusing its efforts on delivering solutions that optimize Gigabit Ethernet video transport.
Network administrators can manage the passive optical network through active components in the network, including the erbium-doped fiber amplifiers (EDFAs) and the 100-GHz OADMs. For example, the EDFAs implement automatic gain control and variable optical attenuators that allow software control of power at the input of the amplifier. Information from these active devices flow up to both Cisco Transport Controller and Cisco Transport Manager, allowing both management of and visibility into the network.