Cisco ASR1006 Hardware Installation Guide - Page 114

Cisco DSP SPA for ASR 1000 Series Overview Chapter 3 Overview: Cisco ASR 1000 Series Aggregation Services Routers SPAs Table 3-44 Cisco WebEx Node SPA Front Shutdown Button and LEDs LED Label SYS DISK STATUS Color Off Green Green Off Green Off Green Amber State Off On Flashing Off On Off On On Blinking Meaning System is shut down and ready for physical removal. System is on and running. System shutdown is in progress. Hard drive is inactive. Hard drive is active. SPA power is off. SPA is ready and operational. SPA power is on and good, and SPA is being configured. SPA is undergoing FPD upgrade operation. Note Because the Cisco WebEx Node SPA is a services type of SPA, it does not support routable interfaces. Cisco DSP SPA for ASR 1000 Series Overview To provide voice transcoding and transrating functionalities on Cisco ASR 1000 Series Routers, Cisco SPA-DSP (also referred to as SPA-DSP) has been introduced from Cisco IOS XE Release 3.2S. This section provides information about the need for a DSP SPA, and an overview of the SPA-DSP. It contains the following topics: • Understanding the Need for SPA-DSP, page 3-72 • SPA-DSP Overview, page 3-72 • SPA-DSP LED, page 3-74 Understanding the Need for SPA-DSP The growth of Internet has increased not only in terms of transmitting data, but transmitting voice and video over Internet as well. Although the growth of Internet has been exponential, the implementation of the process to transmit voice and video is challenging. Voice is transmitted over internet using a specific codec from a pool of supported codecs. To provide decoding and encoding from one type of codec to another type, interoperability is needed. The SPA-DSP has been introduced mainly to provide voice transcoding and transrating capabilities. SPA-DSP Overview The Cisco DSP SPA for Cisco ASR 1000 Series Routers is a half-height SPA that provides voice transcoding and transrating functionalities for media streams using different codecs. For example, translating a media stream that has been encoded using G.711 into G.729, it requires Digital Signal Processor (DSP). The SPA-DSP is a service SPA, and does not have any external physical interfaces. The SPA-DSP works in conjunction with the Session Border Controller (SBC) application to provide voice transcoding capabilities. The SPA-DSP can be installed in either SIP-10 or SIP-40 in any of the slots. 3-72 Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Hardware Installation Guide OL-14126-12