Cisco ASR 1000 Configuration Guide

24-2
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
OL-14127-08
Chapter 24 Overview of the Cisco DSP SPA for ASR 1000 Series
Pre-requisites
Pre-requisites
Table 24-1 provides the software and hardware compatibility requirement matrix for installing a
SPA-DSP:
Ta b l e 24-1 SPA-DSP Hardware and Software Compatibility Requirements
Overview of the Cisco DSP SPA
The Cisco DSP SPA has been introduced on Cisco ASR 1000 Series Routers to provide voice transcoding
and transrating functionalities. The DSP SPA is a half-height SPA. The Product ID of DSP SPA is
SPA-DSP. The SPA-DSP is a service SPA and does not have external physical interfaces on the front
panel. The SPA-DSP has 21 Digital Signal Processors (DSPs) which perform the encoding and decoding
of voice streams. The SPA-DSP works in conjunction with the SBC application to provide the voice
transcoding and transrating functionalities. The CUBE (ENT) can also use the SPA-DSP for transcoding
and transrating.
The SPA-DSP in the transcoder case, provides functionality to translate one type of media stream using
a specific codec type to another type of media stream that uses a different type of codec technologies.
This not only includes translation between differing codecs, but also functionality such as the translation
between different packetization settings (transrating), and the ability to perform DTMF interworking.
The SBC on the Cisco ASR1000 Series Router, externally known as Cisco Unified Border Element,
Service Provider - CUBE (SP) can be configured as a Unified SBC or as a Distributed SBC. When
configured as a distributed SBC, the SPA-DSP can be used externally as a centralized resource for other
SBCs.
High-Level System Details
Based on the type of operational management, the SPA-DSP functions can be divided into two modules:
Data Plane and Control Plane.
The data plane module is responsible for processing and sending the data. The SPA-DSP does not have
any interfaces towards the network. The DSPs on the SPA process the voice packets that they receive
from the QFP side and send the transcoded voice packets back to the QFP.
After initial set up a boot image is uploaded to the SPA-DSP. The full SPA-DSP image is then uploaded
and the SPA-DSP is controlled through the DSP control packets.
Note The SPA-DSP does not have a CPU or a hard disk.
Type of DSP SPA
(Product ID)
ASR1000 Router
Chassis
supported
Route
Processor
supported
SIPs
supported
ESPs
supported
Minimum Cisco
IOS XE Software
Release
supported
SPA-DSP ASR 1002,
ASR 1004, and
ASR 1006
Chassis
RP1 and
RP2
SIP10 and
SIP40
ESP10 and
ESP40
Cisco IOS XE
Release 3.2s

Cisco ASR 1000 Specifications

General

Brand	Cisco
Model	ASR 1000
Category	Network Router
Language	English