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Asterisk VoIP Card for IP PBX Systems

VoIP PCI/PCIe Card for Voice Codec, transcoding, Echo Cancellation, and VQE for Open Source VoIP Systems


SigC5561 VoIP PCI card for Asterisk IP PBX server
SigC5561 card without PCI adapter, view of front bezel and bottom side. Configurable from 1 to 12 high-density Texas Inst TNETV3010 VoIP chips. Each chip has six (6) cores capable of 32 channels each of carrier grade VoIP, including echo can and voice codec

Overview

The SigC5561 PCI/PCIe card utilizes Texas Instruments / Telogy TNETV3010 DSP devices to provide a high-density, low-cost packetization engine for Asterisk™ IP PBX and open source VoIP systems. The TNETV3010 device yields a high ratio of channel capacity to cost and board space, providing up to 192 channels per device including full 128 msec echo cancellation, multiple voice codecs (see list below), G.711.1 packet loss concealment, VAD, CNG, DTMF functions and RFC 2833 relay, jitter buffer, and more.

The SigC5561 card complies with HMP (Host Media Processing) architecture and allows transfer of both tdM and packet data over PCI/PCIe bus, providing a hardware engine for PC-based media gateway, softswitch, and transcoding server applications based on open source VoIP software. Channel capacity scales from 192 to 2304 G.711 (PCM voice), 96 to 1152 G.729AB or iLBC, and 72 to 864 G.723 or GSM-AMR channels.

The SigC5561 board may also be used in ATCA, cPCI, VME, and other infrastructure platforms. Click here for more information about non-desktop PC configurations of the SigC5561 card.

SigC5561 card highlights include:

Voice codecs, echo cancellation, and voice quality monitoring are good examples of "DSP real-time processing" performed far more efficiently and at far lower cost using the SigC5561 card than using server arrays based on multi-core x86 processors. At higher channel capacities, for example 120 or more, adding one or more SigC5561 cards triggers a cascade of cost savings, eliminating Lbr codec IP/royalty fees, reducing electric and cooling costs, and reducing required physical space. In effect, each server is maximized for efficiency and the waste and high cost caused by "motherboard farming" is eliminated.

VoIP Overview

In a typical VoIP application, the SigC5561 card processes tdM channels of 64 kbps PCM (G711) voice, fax or data traffic. Voice data is optionally compressed via G729AB, G723, GSM-AMR, EVRC, iLBC, or other Lbr codec. In addition, the SigC5561 card provides RTP, RTCP, or T.38 packetization of voice and fax data, and a comprehensive range of voice and data telephony functions.

In a typical transcoding application, the SigC5561 card transcodes between one type of Lbr codec and another, for example between G729AB and G723, or G729AB and GSM-AMR, using embedded logic on the board to allow internal PCM loopback and framesize adjustment.

Mixed VoIP and transcoding applications are supported.

For advanced applications, an optional WinPath network processor provides packet formatting, segmentation, reassembly, and routing functions directly on the SigC5561 card, without host intervention, including direct GbE or 10/100 interfaces to RJ-45 connectors.

PSTN Interface Options

There are three (3) ways to interface PSTN lines, also known as tdM or PCM data, to the SigC5561 card:
  1. Separate multi-FSX/FXO, multi-T1/E1 or T3 PCI card(s). In this case, tdM data is transported on the PCI bus, between cards. Providers of T1/E1 and T3 cards include Digium, Sangoma, SBE, and more. This method is the least expensive and most flexible, but experiments show that reliable operation is limited to about 500 or so tdM channels over the PCI/PCIe bus on 32-bit PCI/PCIe motherboards.
  2. Unified multi-T1/E1 or T3 card. In this case, the SigC5561 and another PMC form-factor card are combined on a dual site PCI carrier card, which allows tdM data to move between the two cards without PCI bus interaction. A typical dual carrier card configuration would combine a SigC5561 card and a wanT3 channelized DS3 card. The dual carrier method allows higher channel capacities due to direct inter-card tdM communication, free from impact of system activities involving the PCI/PCIe bus. tdM channel capacities up to 2048 full-duplex channels are possible per SigC5561 card.
  3. tdMoIP protocol. tdM-over-IP protocol, also referred to as CESoPSN, may be used. In this case, tdM data is transported on the GbE interface to the SigC5561 card, where it is "interworked" by the WinPath network processor into tdM format data and routed to the tdM side of the DSP farm. tdM channel capacities up to 2304 full-duplex channels are possible per SigC5561 card.

VoIP Feature Summary

Below are VoIP features included with all configurations of the SigC5561 card.

Voice Compression (CODEC)

G.711 (64 kbps m-law or A-law)
G.711.1 (Appendix A) Packet Loss Concealment
G.722 wideband (48, 56, 64 kbps)
G.723.1 (24, 40 kbps)
G.723.1A
G.726 ADPCM (16, 24, 32, 40 kbps)
G.727 ADPCM
G.728 (16 kbps)
G.729 (8 kbps)
G.729AB (8 kbps)
G.729D (6.4 kbps)
G.729E (11.8 kbps)
GSM FR, GSM EFR, GSM AMR
EVRC
SMV
iLBC
QCELP13
FAX
T38U
CID
CONF

Echo Cancellation

G.165 and G.168 64 msec nominal. Up to 128 msec
with multiple reflection cancellations; includes Telogy
proprietary enhancements

Jitter Buffer

Packet playout unit; Telogy packet-loss mitigation options

Silence Suppression

VAD, CNG, Telogy proprietary
G.723.1A
G.729AB
GSM FR
GSM EFR
Fax Relay / Pass-Thru: T.38 TCP/IP
FRF.11
AAL2 I.366.2
V.17 @ 7.2, 9.6, 12, 14.4 kbps
V.27ter @ 2.4, 4.8 kbps
V.29 @ 7.2, 9.6 kbps
T.30
Modem Relay / Pass-Thru:

V.92
V.90
V.34
V.32bis
V.22bis
V.21
V.23
Bell 212, 103
V.42 MNP 2-4, V.44 MNP 5
Modem transparency: auto-switch from G.7xx to G.711
on fax or modem detection

ISDN

Sync-mode PPP, HDLC framed PPP
V.110
56k rate adaptation

VoIP
Standards
Compliance
RTP
RTCP per RFC 1889/1890/2508
UDP/IP header
In-Band Signaling / Call Processing DTMF, MF R1, MF R2, MFC, SS7 COT, SF, Call Progress for T1 CAS
Out-of-Band Signaling / Call Processing DTMF Relay (RFC 2833)
Rx, Tx Gain Control Programmable ±31 dB
Following Features Require Optional Network Processor SRTP (RFC 3711)
tdM Protocols CESoPSN (tdMoIP)
H.110 subset (also known as CTbus)
VoATM
Standards
Compliance
AAL0 (raw cell)
AAL1
AAL2 I.366.2
Network Packet Switching Example: G.729AB / RTP G.726 / AAL2
Packet Aggregation and Processing

Running default Control Path Software (CPS) and Data
Path Software (DPS) builds, the WinPath 747 or 787
Communications and Network Processor provides:

  • ATM Adaptation layers AAL0, AAL1, AAL2 and AAL5
  • ATM traffic shaping M traffic shaping M traffic shaping M traffic shaping for Cbr, Vbr, GFR and Ubr, compatible with ATM Forum TM-4.1
  • Up to 64k simultaneous channels (VC or VP) with per-VC queuing
  • ATM cell and CPS switching up to 622 Mbps full duplex
  • AAL1 -- supports structured and unstructured Circuit Emulation Services (CES 2.0) ATMF-0078
  • IMA -- Inverse Multiplexing over ATM in one or more IMA groups according to ATMF 0086.001
  • IP Termination -- support for IPv4 (including TOS, TTL, header processing).
  • IP Routing -- support for IPv4, RFC 1812 (including TOS, TTL, header processing)
  • IP Interworking
    • Per flow WFQ and shaping
    • Routing and forwarding over ATM (RFC 1483/2684)
    • IP routing and forwarding over PPP (RFC 2364/2472) and PPP-Mux (RFC 1661)
    • Supports IPv4 IP routing and forwarding over Ethernet (RFC1042)
  • IP Classification -- supports Multi-field Classification and Differentiated Services according to RFC 2474 and 2475. Algorithmic with single or multiple passes (without external CAM)

Software Support

Asterisk software support includes Linux drivers and install scripts. For open source VoIP and application-specific programming, DirectdSP software is available that allows host C/C++ programming interface to the card. WinXP and Win9x drivers and Win version of DirectdSP software are also available.

The SigC5561 card may also be used with applications other than Asterisk; the C5561 card driver and API fully support user-defined application software.

Channel Capacity table

The table below gives channel capacities for available configurations of the SigC5561 card, including 2 DSPs, 7 DSPs, and 12 DSPs. Note that all channels include 64 msec echo cancellation.

Description Codec 2 DSPs 7 DSPs 12 DSPs
 

 ITU Codecs

G.729
G.723
G.726
G.711
G.711 App 1
Fax, T38
192
144
192
384
336
384
672
504
672
1344
1176
1176
1152
864
1152
2304
2016
2016
GSM Codecs GSM FR
GSM EFR
GSM AMR
144
144
144
504
504
504
864
864
864
CDMA Codecs EVRC
SMV
QCELP13
96
96
96
336
336
336
 
576
576
576
Cable Codecs iLBC
G728
G729E
Fax, T38
96
96
96
192
336
336
336
672
576
576
576
1152

Simultaneous Call Capacity table

The table below gives IP-to-IP simultaneous call figures assuming one call leg is G.711. "IP-to-IP" is typically referred to as transcoding. Note that G711 leg includes 64 msec echo cancellation, if required by the application.


 
Description Codec 2 DSPs 7 DSPs 12 DSPs
ITU Codecs G.729
G.723
   G.726     G.711 App 1
Fax, T38
192
144
192
336
384
672
504
672
1176
1176
1152
864
1152
2016
2016
GSM Codecs GSM FR
GSM EFR
GSM AMR
144
144
144
504
504
504
864
864
864
CDMA Codecs EVRC
SMV
QCELP13
96
96
96
336
336
336
576
576
576
Cable Codecs iLBC
G728
G729E
Fax, T38
96
96
96
192
336
336
336
672
576
576
576
2016

Download Reference Guide

Specifications

Below are specifications for the SigC5561 card. All specifications are subject to change.

Storage:
Dimensions 4.3 x 7.44 x 0.5" (109 x 189 x 12.7 mm) Length measured from surface of back-plate, height measured from surface of motherboard, width less than single slot
DSP Farm Up to 12 Texas Instruments TNETV3010 devices with
Premium Carrier Grade Telogy Software; includes indemnification
of essential patents for conformance & interoperability
Network Processor (NPU) Wintegra WinPath 747 or 787 Access Packet Processor
PCI Bus Interface 32-bit, 33 MHz PCI; 3.3V signaling with passive adapter, 5V signaling with active adapter
PCIe Bus Interface 4x or higher, up to 133 MHz clock rate, differential signaling per PICMG v1.3, active adapter including PCIe-to-PCI bridge
Power Consumption 15W in 2 DSP configuration
16W in 7 DSP configuration
23W in 12 DSP configuration**
Temperature Operating: 0șC to 55șC (airflow >200 LFM)
  Storage: -40șC to 85șC
Humidity Operating: 10 to 90% non-condensing
5 to 95% non-condensing
Designed to Meet FCC Part 15 Subpart B
EN55022
EN55024
UL60950 3rd edition
UL60950 3rd edition

** Worst-case figures, measured under full load "stress conditions" with voice software running Lbr codec and 64 msec on all channels

Asterisk is a trademark of Digium, Inc.