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Re-architecting Broadband Networks – Cisco Blogs

That is Half II of a three-blog sequence on options to beat challenges related to bridging the digital divide.

Within the earlier weblog (see Bridging the Digital Divide with Subscriber Edge), we mentioned the normal broadband community design. On this weblog, we are going to deal with a brand new structure for broadband networks, and the challenges that they deal with.

Shifting to a distributed structure

The power to allow subscriber capabilities on completely different layers or units within the community offers a possibility to optimally place subscriber edge within the community to assist match economical and user-experience wants. For instance, provided that video quantities to greater than 75% of the amount of whole subscriber visitors, versatile termination permits for the environment friendly offload of video visitors nearer to the subscriber by cautious placement of content material caches and the addition of peering factors. Distributed termination of subscribers improves the general consumer expertise because the visitors follows a extra very best path that optimizes capability utilization and helps decrease latency for demanding purposes.

With this distributed structure, communication service suppliers (CSPs) can save prices by decreasing unneeded bandwidth upgrades of the whole community by visitors offload additional downstream. Nonetheless, with extra distributed placement of subscriber edge capabilities utilizing completely different termination fashions, CSPs might face challenges with scaling, managing, and working subscriber providers networks.

To resolve these challenges, Broadband Discussion board outlined the Management and Person Airplane Separation (CUPS) mannequin for the Broadband Community Gateway (BNG) in TR-459 (see Determine 1). CUPS permits distribution of consumer/knowledge planes nearer to the subscriber, permitting the management aircraft operate to be centralized. It is a vital change from the normal BNG structure—the place management aircraft and consumer aircraft capabilities are tightly built-in and carried out by the identical machine. This new distributed architectural strategy takes benefit of CUPS to supply newer broadband providers and use instances which can be completely different from conventional choices.

Centralizing the management aircraft operate helps decrease operational prices in a distributed subscriber edge operate that may be non-uniform with various necessities on scalability, kind issue, and function.

CUPS additionally permits new income streams or fashions, which weren’t attainable with the normal structure, similar to differentiated service plans. For instance, service suppliers can supply a day/evening plan, the place subscribers are provisioned or moved to a smaller set of consumer planes in the course of the evening for price financial savings and potential sustainability advantages.

Prospects may supply tiered plans with Platinum, Gold, and Greatest-Effort, based mostly on redundancy capabilities to assist defend premium subscribers from consumer aircraft, entry, or website failures. With the management aircraft not tightly built-in with the consumer aircraft, and full visibility of all consumer planes, CUPS permits larger flexibility for CSPs to seamlessly transfer subscribers to completely different nodes with out disruption.

Determine 1. New CUPS structure view

The newest growth by the Broadband Discussion board is Subject 2 of TR-459 Multi-Service Disaggregated BNG with CUPS specification (see Figure2), which permits improved resiliency, scalability, and sooner deployment instances to assist present a greater end-user expertise with a extra dependable and constant service.

Determine 2. MS-BNG capabilities separating into management aircraft and consumer aircraft (from BBF TR-459i2)

Within the third weblog, we are going to share particulars on the Cisco Subscriber Edge answer, together with the structure, technical benefits, and buyer advantages.


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