 TB300 Datasheet (PDF)
The TB300 is based on the same hardware platform as the industry-proven TB200, however the TB300 is configured for voice over PacketCable applications. The TB300 is IPDT (IP digital terminal) gateway that allows MSOs offer a toll-quality voice service. Other than basic cable service, voice is clearly the largest single revenue line item, delivering from $50 to $70 per month per subscription on average - at 40% or better margins. Cable telephony has shown immediate take rates in the 10% range, with total marketshare of 30% or more 24 months out. A huge revenue source! Offering voice service is also a benefit to other strategic services such as VoD or ITS - as telephony customers show remarkably low churn (under 2% per year) and the customer enjoys the convenience of a single bill for all telecommunications services coming into the home. The PacketCable IPDT approach to VoIP allows VoIP to be deployed easily and safely today, by installing compliant VoIP adapters at the subscriber, while the highly-reliable Class 5 switch delivers the features and service. When next-generation VoIP services are ready to go, just over-lay them on the same network model, without having to replace the subscriber gateway, DOCSIS 1.1 CMTS or any of the other network equipment. 
The TB300 uses NCS 1.0 on the line side, and interoperates with a wide variety of VoIP MTAs / BTIs from popular manufacturers such as Tellabs, Motorola, Arris and others. The TB300 is designed to be fully PacketCable compliant, and will evolve into a full packet-cable compliant media Gateway supporting a standard CMS and TGCP interface with a software upgrade. * The TB300 is based on the TB200 platform, which is the most widely deployed access gateway in service today with over 40,000 paying subscribers in service. Actual measured reliability for TollBridge gateways in service is over 99.999% with well over 99.99% call completion. The TB200 is NEBS certified and has fully redundant hardware and software elements with no single point of failure. The TB200 includes safety and environmental certifications from a variety of international agencies including UL, CE mark and others. The TB300 achieves its performance through a robust modular architecture. The shelf itself is a 21-slot telco rack-mounted system, with a high-performance mid-plane containing both packet-switched and TDM channels. Available modules include "voice" modules that perform encoding, decoding and call control, "switch" modules that route packets and cells to the proper destination within the system and "interface" modules that connect to the WAN and switching systems. "Administration" modules are also used to perform provisioning, housekeeping and various management functions. All modules have an optional redundant twin and are hot-swappable. Functionally, the TB300 interworks voice over IP (VoIP) packets in the access network via NCS / RTP to Class 5 switches or softswitches in the PSTN. The TB300 employs a powerful, DSP-based architecture with superior echo cancellation and jitter buffer implementations to deliver toll-quality voice service. Dialtone, billing and all of the value-added custom calling features available from the Class 5 switch today are transparently delivered by the TollBridge platform. This approach allows the MSO to deploy VoIP in the access network today and migrate smoothly to a softswitch-based service model without swapping out any hardware in the future. The TB300 operates in accordance with CableLab's PacketCable PKT-TR-ARCH-LCS-V01-010629 Line Control Signaling System Architecture. Full certification is planned for late 2001. Circuit-switched voice traffic coming from the Class 5 switch is packetized and sent to a Media Terminal Adapter (MTA) or Broadband Telephony Interface (BTI) located at the customer premises. These devices are also often referred to as residential "gateways". The TB300 IPDT transparently delivers all Class 5 services to end users. Going the other way, the MTA / BTI translates samples from multiple voice-lines into packets that are sent through the broadband network. The TB300 Voice Gateway translates the packetized voice data back into circuit switched voice traffic for delivery to the Class 5 switch using a GR-303 or V5.2 interface. The TollBridge architecture delivers toll-quality multiline voice that is indistinguishable from circuit-switched voice. - Converges both data and voice into a common packet-switched access service enabling MSOs to offer the widest range of revenue-producing services using minimal bandwidth
- Leverages existing voice switches for increased reach and performance: an entire metropolitan area may be served from a single Class 5 switch
- Migrates to a CMS / softswitch model seamlessly
- Modular platform with high-speed midplane and complete fault-tolerance for scaleability and reliability
- Support for all network services and Class features including Centrex, call waiting, voicemail, E-911, 411, etc.
- Toll quality voice: phone service better or equal to POTS
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