Digital Telephone Card E1 for Asterisk

Terratel Digital Telephone Card E1 PCI with Hardware Echo Cancellation (to 128 voice channels)

Features

  • Legacy PBX/IVR Services, Asterisk IP-PBX
  • VoIP Gateways (supports SIP, H.323 и IAX)
  • SyncPPP, Frame Relay, Cisco HDLC, Multi-link PPP
  • a-Law, μ-Law, and Linear Modes Supported
  • Line coding HDB3, AMI, B8ZS

Overview

Terratel offer for the Asterisk project or FreeSwitch a line of high quality digital interface cards E1 to connect IP PBX, IVR systems, VoIP Gateway, or custom telephony solution to the public telephone network PSTN.

The D-201E/D-401E telephony card is designed to build digital telephony systems based on the Asterisk IP-PBX. The card performs data/voice exchange over E1 links.

The D-201E/D-401E card is notable for its flexible installation options – it can be installed in both 5V and 3.3V slots.

This allows to use the board in PCI as well as in PCI-X slots. The PCI master mode is used to relieve the CPU from I/O operations and increase the PCI bandwidth.

The PCI 32/33 MHz bus is used as a host interface. This card provides up to 60/120 links to transmit voice and data over four E1 interfaces. The E1 operating mode can be selected individually for each PCI card interface.

D-201 digital telephone card 2E1 to connect IP PBX Asterisk

Pic 1. D-201 digital telephone card 2E1

The D-201E/D-401E telephony card is fully compatible with DAHDI/Zaptel drivers.

Digital E1 cards allow for installing the hardware echo cancellation unit – ECM-128-OCT/ECM-064-OCT of its own design.

Hardware Echo Cancellation Module

Echo appears when integrating VoIP and PSTN networks.

This is due to the fact that the VoIP network introduces a delay that analog TDM systems do not have.

Terratel has designed a hardware echo canceller module ECM-128-OCT for its digital telephony interfaces card E1 for Asterisk-based IP-PBX appliances (or FreeSwitch).

Hardware Echo Cancellation Module for Asterisk

Pic 2. Terratel Hardware Echo Cancellation Module ECM-128-OCT

The module provides a high level of echo cancellation and voice enhancement while reducing load on the CPU, as compared to Oslec (Open Source Line Echo Canceller), the software-based echo cancellation solution provided in the standard Asterisk framework.

Terratel’s echo cancellation module provides a high level of echo cancellation and voice enhancement while reducing load on the CPU. Each separate device (Terratel D201E or D401E) requires a single Echo Canceller card.
The hardware echo canceller module includes and support for up to a total of 128 voice channels.
It good alternative to software echo cancellation solution typically used in standard Asterisk systems (IP telephony solution).

The hardware echo canceller module is designed to process conversational information simultaneously in 120 channels, which allows not to load the processor of a VoIP system.

The solution is based on the use of Octasic’s DSP processor, which allows for 128 ms (1024 taps) of echo cancellation on all channels in accordance with recommendation G.168 ITU-T.

Advantages of using the hardware echo cancellation

The main advantages of using the hardware echo cancellation module:

  • Use of Octasic DSP Processor
  • 128 ms (1024 taps) echo cancellation on all channels
  • Dynamic non-linear processor
  • Automatic tail finder
  • Cancel multiple reflections
  • Double talk detection

Digital Telephone Card E1 Key Features and configurations

  • Up to 30 simultaneous calls per 2E1 port (and 120 total 4E1 card)
  • Supports E1 physical interface connections
  • TDM protocols support: ISDN PRI, CAS
  • Industry standard RJ-45 port
  • PCI form factors
  • Available in 2E1 and 4E1 ports, and also in addition to the hardware echo cancellation module

Ordering information

The company offers to buy VoIP Digital Telephone Card E1 for Asterisk:

Part Number Photo Description
D-201 D201 Digital board 2E1 for Asterisk, Telephone Card D201 2E1, 60 channels for voice and data transmission via 2 E1 interfaces without hardware echo cancellation module
D-201E D201E Digital board 2E1 for Asterisk, echo cancellation unit, Telephone Card D201E 2E1, 60 channels for voice and data transmission via 2 E1 interfaces, G.168 echo cancellation unit
D-401 D401 Digital board 4E1 for Asterisk, Telephone Card D401 4E1, 120 channels for voice and data transmission via 4 E1 interfaces without hardware echo cancellation module
D-401E D401E Digital board 4E1 for Asterisk, echo cancellation unit, Telephone Card D401E 4E1, 120 channels for voice and data transmission via 4 E1 interfaces, G.168 echo cancellation unit

Digital Telephone Card E1 Technical Specifications

System Type
Board
Application
Legacy PBX/IVR Services
Voice over Internet Protocol (VoIP) services
Complex IVR Trees
“Meet-Me” Bridge Conferencing
VoIP Gateways (supports SIP, H.323 and IAX)
Calling Card Platforms
Voice/Data Router
PRI Switch Compatibility – Network or CPE
Asterisk IP-PBX
Port Features
HDB3, AMI Line coding
CRC-4, not CRC-4, ESF, SF, D4T1/E1 Frame alignment
Data Transfer Protocols
SyncPPP
Frame Relay
Cisco HDLC
Multi-link PPP
Voice Transfer Protocols
E&M Wink
a-Law and Linear Modes Supported
Hardware Requirements
CPU 800 MHz or higher
RAM 128 MB or higher
PCI 2.2 slot 32-bit/33 MHz
Software Requirements
Linux kernel 2.6.x