Embedded Systems Design - Europe - August/September 2007 - (Page 24)

DSPs Features that an office-in-a-box device can support System partition Features User Supports 8 to 100 users. Each user will have: Data: PC network connection Phone: IP phone, analog and digital phone connection, video, and voice and video mail Codec: G.711, G.729AB, G.723, G.722, and G.722.2 Services: Session Initiation Protocol (SIP) or other call manager, IP PBX, voice mail, conferencing, short message service (SMS), and multimedia messaging service (MMS) SMB gateway: Network address translation (NAT), router, firewall, VPN, network management Flexible WAN connection: Cable, DSL, fiber, wireless, others Wired LAN: 10/100 or 10/100/1000 Mbit/s Ethernet, 802.1x Ethernet protocols Wireless LAN: 802.11 a/b/g/n and future standards Services: E-mail, shared storage, network printer Protocol: Virtual LAN, QoS, security, and others Video conferencing: H.264 common intermediate format (CIF) Video surveillance: NTSC, PAL, and serial raw digital video formats Services: Video mail, video surveillance streams and storage Voice Data Video Table 1 area, cost per channel, power consumption, and architecture according to the needs of each application. As shown in Figure 1, the DSP often communicates with an external network or host processor in the system. Because many OEMs have existing development investments in a host-processing environment, a DSP that’s compatible with any host processor is essential. In some applications, where scalability isn’t desired, the DSP supplier should offer a choice of standalone DSPs for voice processing and integrated DSPs that combine voice and host processing on one device. A new concept, the ofﬁce-in-a-box platform, combines multiple SMB communications in one network-access device. Today, these solutions provide voice functionality such as: Phone: Connections and power for wired IP and analog phones as well as a digital PBX, whether these devices are targeted at the low-cost, mid-tier, or high-end markets. In the future, telephony support will extend to wireless and ﬁxed-mobile convergence user devices. VoIP gateway: Connections for access lines and voice trunks. Also supports foreign-exchange station/ foreign-exchange ofﬁces, fax and modem devices, and a full range of voice codecs. IP-PBX application: Provides soft- • • • • • • • ware-based call management with voice mail and applications such as specialized call routing and call attendant. Moving forward, ofﬁce-in-a-box will include: Router: Enterprise-class data routing with multiple, scalable Ethernet ports. Firewall/uniﬁed threat management: Security for data, voice, and video streams. Wireless LAN access point and WAN modem: Multiple types of wireless LAN and WAN access could be added as cards in the device. WAN types supported include DSL, cable, and passive optical network (PON). At some point, the requirement to support WiMAX may emerge. Video surveillance: Support for video surveillance cards and convergence of the video streams with voice and data applications. SMB customers will also want the option to store video ﬁles locally or send video streams over the network to a central monitoring station. This will be done selectively based on analysis of a real-time video feed that detects an event that needs to be recorded. This capability requires video-codec conversions to obtain optimal bandwidth use over the network. • • Storage: Support for networked storage or customer-provided equipment (CPE) storage devices for voice mail and video ﬁles. Management: An integrated framework for remotely managing devices and quality-of-service for voice and video trafﬁc. The service integration offered by an ofﬁce-in-a-box solution depends on a single-DSP system design. The single DSP provides the necessary integration of voice, video, and data processing. Figure 2 shows a typical system design using an integrated DSP. With this system design, an ofﬁce-in-a-box device can support the features listed in Table 1. As OEMs and ODMs (original design manufacturers) begin their SMB product design, they must carefully consider whether they’re designing plain vanilla single-function devices or integrated solutions that scale between applications and are designed to meet the varied needs of the end customer. These decisions will have a material impact on which DSP technology they select and how that selection will make it easier to reach SMB markets with converged devices. Ravi Kodavarti (ravi@ti.com) is a product manager in Texas Instruments’ VoIP group. Tom Flanagan is the director of technical strategy for TI’s DSP Systems group. 24 AUGUST – SEPTEMBER 2007 | embedded systems design europe | www.embedded.com/europe 020-022-023-024_ESDE.indd 24 5/09/07 15:15:23 http://www.embedded.com/europe

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Contents News Cover Feature: Annual Study Uncovers the Embedded Market DSP Serves the Convergence Needs of Small Business Embedded Test Offers Unique Value for Serial I/O The Software Detective: First-Fault Data Capture Boards May Shrink But Performance Doesn't New Products Advertising Contacts

Embedded Systems Design - Europe - August/September 2007

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