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Cisco DOCSIS 3.0 Downstream Solution Design and Implementation Guide
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Preface
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Chapter 1: Overview of DOCSIS 3.0 Downstream Solution
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Chapter 2: Solution Overview for M-CMTS
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Chapter 3: Solution Overview for I-CMTS
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Chapter 4: Cisco DOCSIS 3.0 Downstream Solution Components
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Chapter 5: Cisco DOCSIS 3.0 Downstream Solution Architecture
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Chapter 6: Implementing and Configuring the Solution
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Chapter 7: Monitoring and Troubleshooting Narrowband and Wideband Components
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Appendix A: Cisco DOCSIS 3.0 Downstream Solution Release 1.0 and 2.0 Component Compatibility Matrix
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Index
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Table Of Contents
Cisco DOCSIS 3.0 Downstream Solution Overview for the M-CMTS
Compatibility with Prior Versions of DOCSIS
Cisco DOCSIS 3.0 Solution Capabilities
Cisco DOCSIS 3.0 Downstream Solution Key Features
Cisco DOCSIS 3.0 Dowstream Solution Components
Cisco and Scientific Atlanta Equipment
Cisco DOCSIS 3.0 Downstream Solution Overview for the M-CMTS
This chapter provides an overview of the Cisco DOCSIS 3.0 Downstream Solution for the Modular Cable Termination System (M-CMTS), and contains the following major topics:
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Cisco DOCSIS 3.0 Downstream Solution Key Features
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In this document, the terms wideband channel, bonded channel, and bonding group have the same meaning: a logical grouping of one or more physical radio frequency (RF) channels over which MPEG-TS packets are carried.
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Description and Scope
The Wideband SPA and Cisco uBR-MC3GX60V line card support M-CMTS DS channels. In the Cisco M-CMTS implementation, the DS channels are aggregated and encapsulated for the Gigabit Ethernet using the Downstream External PHY Interface (DEPI) protocol as defined by DOCSIS M-CMTS.
In case of the Wideband SPA, the DS channels can be referred to as SPA downstream (DS) channels to differentiate them from the Cisco uBR-MC5X20 line card downstream channels. The M-CMTS DS channels can be used either as primary-capable channels (narrowband channels), or as part of bonded channels (wideband channels), or both. The Cisco DOCSIS 3.0 Downstream Solution provides narrowband data services to support DOCSIS 1.x and DOCSIS 2.0 modems and wideband data services to support DOCSIS 3.0 modems over existing hybrid fiber-coaxial (HFC) networks, and it also enables the DOCSIS 1.x, DOCSIS 2.0 and DOCSIS 3.0 modems to share the same M-CMTS DS channel.
With the wideband data services, multiple M-CMTS DS channels are aggregated into a single logical wideband channel (bonding group) that delivers higher bandwidth to the wideband cable modem than was not previously possible with DOCSIS 2.0 Solution. This aggregation of the M-CMTS DS channels is referred to as channel bonding.
The maximum bandwidth supported depends on the number of M-CMTS DS channels that can be aggregated into a wideband channel. The Cisco IOS Release 12.2(33)SCE has been tested with modems with up to eight DS channels. Some examples of modems tested with the solution are:
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Compatibility with Prior Versions of DOCSIS
The Cisco DOCSIS 3.0 Downstream Solution can be deployed in parallel with DOCSIS 1.X and DOCSIS 2.0 modem technology. The Cisco uBR-MC5X20 cable interface line card along with CISco Wideband SPA, supports DOCSIS 1.X, DOCSIS 2.0 and DOCSIS 3.0 cable modems on SPA primary-capable downstream channels and SPA bonded channels. The Cisco uBR-MC3GX60V cable interface line card also supports DOCSIS 1.X/2.0 and DOCSIS 3.0 cable modems on primary-cable downstream channel and bonded channels.
Cisco DOCSIS 3.0 Solution Capabilities
The Cisco DOCSIS 3.0 Downstream Solution provides the following capabilities:
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Primary-capable channels on the Wideband SPA DS channels (also known as SPA RF channels) are associated with the upstream channels from the Cisco uBR10-MC5X20 cable interface line cards. To be primary-capable, these downstream channels carry SYNC messages, Upstream Channel Descriptors (UCD), and Mini-slot Allocation Packet (MAP) messages for at least one upstream channel. They may also carry primary MAC Domain Descriptor (MDD) messages for DOCSIS 3.0 modems.
This capability:
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Architecture and Scope
The Cisco DOCSIS 3.0 Downstream Solution includes these major components:
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The WCMTS is the component located at the cable television system headend or distribution hub and exchanges digital signals with cable modems in a cable network to enable data connectivity to a WAN.
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The Cisco Wideband SIP for the 1-Gbps Wideband SPA is a carrier card that is installed in the Cisco uBR10012 router chassis in slots 1/0, slot 3/0, or both. The SIP provides no network connectivity on its own. The Wideband SPA that inserts into the bay of the SIP provides ports for network connectivity. It enables cable operators to offer high-speed broadband connectivity.
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For more information about the Cisco uBR-MC5X20 line card, see Configuring the Cisco uBR-MC5X20 Cable Interface Line Card at the following URLs:
For more information about the Cisco uBR-MC3GX60V line card, see Configuring the Cisco uBR-MC3GX60V Cable Interface Line Card at URL:
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The DTCC provides centralized DOCSIS clock and time-stamp distribution to the cable line cards within the WCMTS. This card allows synchronization of the DOCSIS clock and time stamp to an external DTI server.
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The DTI server provides DOCSIS clock generation in an M-CMTS architecture. It ensures that the DOCSIS time stamp and frequency between the modular CMTS core, edge QAM device, and upstream are synchronized to nanosecond levels.
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The edge quadrature amplitude modulation (EQAM) device is a network element that is separate from the CMTS. It allows operators to leverage the same network resources to support multiple types of services, such as data, voice, and video.
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WCMs are modems that are DOCSIS 3.0-compliant and support downstream channel bonding.
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NCMs are modems that are DOCSIS 1.x/2.0-compliant and support data from a single RF channel.
Figure 2-1 presents a simplified view of the Cisco DOCSIS 3.0 Downstream Solution. In Figure 2-1, four RF channels are bonded into a wideband channel (bonding group).
Figure 2-1 Cisco DOCSIS 3.0 Downstream Solution
In Cisco IOS Release 12.2(33)SCB, the following components have been added to the scope of the DOCSIS 3.0 Downstream Solution:
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The Cisco SIP-600 is a high-performance, feature-rich SPA interface processor (SIP) that functions as a carrier card for shared port adapters (SPAs) on the Cisco uBR10012 router. The SIP is compatible with one or more platform-independent SPAs.
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In addition to the Cisco Wideband SPA, the Cisco SIP-600 also supports the following Gigabit Ethernet SPAs:
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In Cisco IOS Release 12.2(33)SCE the Cisco uBR-MC3GX60V cable interface line card has been added to the scope of the DOCSIS 3.0 Downstream Solution.
In Scope
The scope of the Cisco DOCSIS 3.0 Downstream Solution comprises fully tested and supported Cisco and Scientific Atlanta components, as well as selected third-party components that Cisco has tested for interoperability.
The following aspects of the solution are in scope:
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Device configuration that is in scope for this document is limited to the Cisco uBR-MC3GX60V line card, Wideband SIP, and Wideband SPA.
For information on edge QAM device installation and software configuration, refer to the edge QAM device documentation provided by the vendor.
Out of Scope
The Cisco DOCSIS 3.0 Downstream Solution-related information in this document pertains to the components listed in the "In Scope" section. Not included in the scope of the Cisco DOCSIS 3.0 Downstream Solution are the hardware and software components that make up the remainder of the cable data network.
For the Cisco DOCSIS 3.0 Downstream Solution, the cable network management tools and operations support system (OSS) facilities for wideband cable are outside the scope of the solution.
Cisco DOCSIS 3.0 Downstream Solution Key Features
For each major release, key features are listed in the following sections.
In the Cisco IOS Release 12.3(23)BC, the DOCSIS 3.0 Downstream Solution provides the following key features:
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Represents the narrowband capability of a SPA DS channel.
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Primary-capable channels provide narrowband data services to support DOCSIS 1.x and DOCSIS 2.0 modems.
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Provides up to 48 SPA DS channels plus 40 built-in DS channels in addition to the downstream channels on the Cisco uBR-MC5X20 line cards for DOCSIS 1.x and DOCSIS 2.0 traffic.
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Provides narrowband data services to support DOCSIS 1.x and DOCSIS 2.0 modems and wideband data services to support DOCSIS 3.0 modems over HFC networks; it also enables DOCSIS 1.x, DOCSIS 2.0 and DOCSIS 3.0 modems to share the same SPA RF channel.
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In Cisco IOS Release 12.2(33)SCB, the following additional features are supported on the DOCSIS 3.0 Downstream Solution:
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The DOCSIS WFQ Scheduler is an output packet scheduler that provides output scheduling services on both WAN uplink interfaces and DOCSIS downstream interfaces.
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This new CMTS feature enables dynamic bandwidth sharing (DBS) on modular cable and wideband cable interfaces.
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CMTS supports voice services on voice-enabled wideband cable modems.
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The Wideband Modem Resiliency feature provides the best possible service in the event of non-primary RF channel disruptions to ensure that a cable modem remains operational. With the implementation of this feature, the CMTS does not force a cable modem to perform a MAC reset if the CM loses connectivity to the CMTS on one or all of its non-primary RF channels.
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The DOCSIS 3.0 Downstream Bonding for Bronze Certification feature helps cable operators offer new, more bandwidth-intensive services by adding one or more additional downstream quadrature amplitude modulation (QAM) channels to the standard broadband DOCSIS system.
In Cisco IOS Release 12.2(33)SCE, apart from the features supported in Cisco IOS Release12.2(23) BC and Cisco IOS Release 12.2(33)SCB, the following additional features are supported on the DOCSIS 3.0 Downstream Solution:
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Cisco DOCSIS 3.0 Dowstream Solution Components
Cisco DOCSIS 3.0 Downstream consists of Cisco and Scientific Atlanta components that are tested, documented, and fully supported by Cisco or Scientific Atlanta. Also, third-party equipment, although not fully supported by Cisco, has been selected and tested for interoperability with the solution components.
Cisco and Scientific Atlanta Equipment
For the Cisco DOCSIS 3.0 Downstream, the following Cisco and Scientific Atlanta equipment have been tested in the context of the solution:
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Third-Party Equipment
For the Cisco DOCSIS 3.0 Downstream Solution, Table 2-1 lists the third-party component, vendor, and the basic functionality that each component provides.
