AudioCoded
TM
Enabling Technology Products
The AC491xxx family of DSPs is an ideal solution for high density, carrier
class Voice over IP gateways. Featuring high channel density (up to 240
channels of non-compressed voice, or 120 channels of compressed voice),
low power consumption (less than 5 mW/ch for non-compressed voice), and
low footprint (16x16 mm) with no external memory required, the AC491xxx
provides an excellent building block for high density gateways. Field-proven,
feature rich software and reference design, enables the rapid development
and fast time-to-market of the complete solution.
Deliver Feature-Rich Technologies
The AC491xxx voice over packet processor combines up to 120 channels of
toll quality low bit rate (LBR) voice compression or 240 G.711 channels, which
are processed with an improved G.168-2002
1
compliant echo canceller
(configurable tail length of up to 128 msec). Other voice quality enhancers
include Adaptive Voice Activity Detection, Comfort Noise Generation and
Adaptive Jitter Buffer. Field-proven G3 Fax Relay, compliant with the T.38
ASN.1 standard, is a major enhancement to the AC491xxx offering. The Fax
Relay, that can withstand delays of up to 10 seconds in the network, has
passed several interoperability tests with major OEMs in the world, and was
tested with numerous fax machines. The Fax Relay functionality does not alter
the channel density.
Enhance System Solutions
The AC491xxx also provides RTP/RTCP Packetization and DTMF relay, or AAL2
Packetization. This feature offloads the Packet Processor from such tasks.
RTP Packets may be optionally encrypted according to state of the art encryption
algorithm AES. The AC491xxx also offers a new set of media processing
technologies, such as fast/slow voice playback, automatic gain control, energy
detector, and packet to packet Transcoding (LBR to PCM in one channel).
These features enable developers of Media Server Platforms to exploit
AudioCodes' vast experience in the voice over packet market for significantly
shortening their time-to-market.
Field-Proven Reference Design
By using the AC491xxx in its other high density applications, AudioCodes has
the unique capability to offer its VoP Processor customers field-proven reference
designs, which are used and tested by customers throughout the world.
The AC491xxx offers an easy to integrate Utopia Level 2 interface for media
packets, which is suitable for many popular Network Processors. For control
packets, an Enhanced HPI interface is used. Suitable drivers are supplied
with the AC491xxx for fast software integration.
AC491xxx Features
7 Wireline, wireless & cable low bit rate Voice Coders
7 G.168-2000 (future: G.168-2002
1
) compliant Echo Canceller
7 T.38 compliant Fax Relay (does not reduce LBR density)
7 In-Band Signaling, international caller ID support
7 IPmedia
TM
features
7 PacketCable media encryption (AES)
7 Adaptive Jitter Buffer
7 RTP/RTCP Packetization
1 Standard pending ITU final approval
No need for external memory
Low per-channel cost, power and footprint
Field-proven reference designs
Proprietary evaluation & development tools
AC491xxx
High Density Voice over Packet Processor
AudioCoded
*
Platforms for Enhanced Voice Services
2002 AudioCodes Ltd. All rights reserved. AC, AudioCodes, AudioCodes
logo, AudioCodes, IPmedia, Mediant, MediaPack, MP-MLQ, NetCoder, Stretto,
TrunkPack and VoicePacketizer are trademarks or registered trademarks
of AudioCodes Ltd. All other marks are the property of their respective
owners. The information and specifications in this document and the
product(s) are subject to change without notice.
Ref. # LTRT-00270 01/03 V.1
Applications
Carrier Class Voice over IP Gateways
Class 4 and Class 5 Switches Replacements
Trunking & Access Gateways
Wireless (UMTS, CDMA, GSM) and Cable High
Density Gateways Applications
Large PBXs
About AudioCodes
AudioCodes Ltd. (NASDAQ: AUDC) designs,
develops and markets Voice over Packet media
gateway technologies and systems for
converged networks. The company is a market
leader in voice compression technology and
the key originator of the ITU G.723.1 standard
for the emerging Voice over IP market.
AudioCodes' product line includes enabling
technology products such as Voice over Packet
chip processors, VoIP communication boards,
VoIP media gateway modules and CPE devices.
In addition, AudioCodes provides OEMs with
media gateway system solutions for packet
networks in the wireline, wireless, broadband
access and media server markets.
International Headquarters
4 HaHoresh Street
Yehud, Israel 56470
Tel: +972-3-539-4000
Fax: +972-3-539-4040
US Headquarters
2890 Zanker Road, Suite 200
San Jose, CA 95134
Tel: +1-408-577-0488
Fax: +1-408-577-0492
China
Room 209, Tower A, Grand Pacific Building
8A Guanghua Road
Chao Yang District
Beijing 100026, P. R. China
Tel: +86-10-6581-6622
Fax: +86-10-6581-5599
Japan
S Building B1F, 2-30-2
Chuou, Nakano-ku
Tokyo 164-0011, Japan
Tel/Fax: +81-3-5348-1405
E-Mail info@audiocodes.com
www.audiocodes.com
AudioCoded
TM
Enabling Technology Products
AC491xxx
Software Specifications
1
Channel Density
Uncompressed 64 kbps Voice
Compressed Voice
Voice Functions
Voice Coders
Other Available Voice Coders
(upon request)
Echo Canceller
3 Way Conferencing
Quality Enhancement
IPmedia
TM
Features
Data Functions
Voice/Fax/Data
Fax Support
Modem Support
Signaling
In-band Signaling
Detection and Generation
Out-of-band Signaling
Caller ID Detection and Generation
Packetization
RTP/RTCP
DTMF Relay
AAL2 Encapsulation
Host Services
HDLC Framing
SS7 Signaling
Encryption
RTP Payload
Up to 240
Up to 120
PCM Interface
Host Post Interface (control and status)
Utopia Interface (packet exchange)
Power Supply
Power Consumption
Operational Temperature Range
Package
1 Please contact AudioCodes representative for specific software availability
2 Standard pending ITU final approval
G.711 PCM (/A-law) at 64 kbps G.723.1 ACELP at 5.3 kbps
G.726 ADPCM at 16-40 kbps
GSM 6.10 Full Rate at 13.2 kbps
G.727 E-ADPCM at 16-40 kbps NetCoder at 6.4-9.6 kbps
G.729A/B CS-ACELP at 8 kbps
GSM Enhanced Full Rate at 12.2 kbps
G.723.1 MP-MLQ at 6.3 kbps
G.729E at 11.8 kbps
QCELP 8 Up to 8.55 kbps
AMR at 4.75-12.2 kbps
QCELP 13 Up to 13.3 kbps
G.728 LD-CELP 16 kbps
EVRC Up to 8.55 kbps
G.168-2000 (future: G.168-2002
2
) compliant with programmable echo tail
of up to 128 msec
Conferencing of 3 participants from PSTN or IP
Voice Activity Detection (VAD) Comfort Noise Generation (CNG)
Packet Loss Concealment (PLC) Adaptive Jitter Buffer
Fast/slow voice playback and announcements Automatic Gain Control
Energy and Answer detectors Packet to Packet Transcoding
Automatic detection and switching
T.38 compliant G3 Fax Relay, 2.4-14.4 kbps or PCM bypass
Automatic switch to PCM for up to V.92 rates
DTMF TIA 464B MF R1, R2 SS4, SS5
User Defined and Call Progress tones
CAS ABCD (From Standard Framers)
Telcordia (Bellcore) On Hook and Off Hook Service (Type 1 & 2)
ETSI On Hook and Off Hook Service (Type 1 & 2)
NTT Number Display (Type 1)
Per RFC 1889, 1890, 2198
Per RFC 2833
Per I.366.2 and AF-VMOA-0145.00
For CCS signaling (ISDN, V5.2)
MTP1 per Q.703
128 bit AES 56 bit key DES, 168 bit key 3 DES (future)
Authentication HMAC MD5, HMAC SHA1
Hardware Specifications
8.192 up to 32.768 Mbps, A/-Law
16 bit Bidirectional
Utopia level 2, 16 bit, 50 MHz
+1.2V (core), +3.3V (I/O)
1200 mW (typ)
0
o
C - 85
o
C
284 pin MicroStar BGA , 0.8 mil
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