Digital Telephone Card E1 for Asterisk

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

digital telephone card E1 for Asterisk, 2E1, 4E1, echo cancellation module

D-401E Digital telephone card 4 E1

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

digital telephone card E1 for Asterisk, 2E1, 4E1, echo cancellation module

Pic 1. D-201 digital telephone card 2 E1

The D-201E/D-401E telephony card is fully compatible with DAHDI/Zaptel drivers. Digital E1 cards can be completed with a Hardware Echo Cancellation module.

Terratel Hardware Echo Cancellation Module

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, Terratel Digital Telephone Card E1 PCI with Hardware Echo Cancellation 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)

Terratel Digital Telephone Card E1 Key Features and configurations

  • Up to or 60 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

Feature of E1 Terratel digital cards for Asterisk

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 product allows for installing the hardware echo cancellation unit – ECM-128-OCT/ECM-064-OCT.

The price of the digital IP telephony card for Asterisk

The company offers to buy digital VOIP ISDN E1 boards for Asterisk:

D201 Digital board 2E1 for Asteris, Telephone Card D201D201 Digital board 2E1 for Asteris
2E1, 60 channels for voice and data transmission via 2 E1 interfaces without hardware echo cancellation module
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D201E Digital board 2E1 for Asterisk, echo cancellation unit, Telephone Card D201ED201E Digital board 2E1 for Asterisk with echo cancellation unit
2E1, 60 channels for voice and data transmission via 2 E1 interfaces, G.168 echo cancellation unit
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D401 Digital board 4E1 for Asterisk, Telephone Card D401D401 Digital board 4E1 for Asterisk
4E1, 120 channels for voice and data transmission via 4 E1 interfaces without hardware echo cancellation module
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D401E Digital board 4E1 for Asterisk, echo cancellation unit, Telephone Card D401ED401E Digital board 4E1 for Asterisk with echo cancellation unit
4E1, 120 channels for voice and data transmission via 4 E1 interfaces, G.168 echo cancellation unit
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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 Line coding
Frame alignment
HDB3, AMI, B8ZS
CRC-4, not CRC-4, ESF, SF, D4T1/E1
Data Transfer Protocols SyncPPP
Frame Relay
Cisco HDLC
Multi-link PPP
Voice Transfer Protocols E&M Wink
a-Law, μ-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

Telephone Card D-201E/D-401E:

• D-201 (2E1, 60 channels for voice and data via 2 interfaces E1);
• D-201E (2E1, 60 channels for voice and data via 2 interfaces E1, hardware echo cancellation module G.168);
• D-401 (4E1, 120 channels for voice and data via 4 interfaces E1);
• D-401E (4E1, 120 channels for voice and data via 4 interfaces E1, hardware echo cancellation module G.168).

Employees of our company will answer your request within 1-3 days. Thank you for contacting us!



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