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Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Hardware Installation Guide
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Chapter 3 Overview: Cisco ASR 1000 Series Aggregation Services Routers SPAs
Cisco DSP SPA for ASR 1000 Series Overview
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.
SYS Off Off System is shut down and ready for physical removal.
Green On System is on and running.
Green Flashing System shutdown is in progress.
DISK Off Off Hard drive is inactive.
Green On Hard drive is active.
STATUS Off Off SPA power is off.
Green On SPA is ready and operational.
Amber On SPA power is on and good, and SPA is being configured.
Blinking SPA is undergoing FPD upgrade operation.
Table 3-44 Cisco WebEx Node SPA Front Shutdown Button and LEDs
LED Label Color State Meaning
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