Twenty-four (24) port modular (line and/or station) analog PCI 3.3/5.0V card

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  • Certified

  • Supported


  • Twenty-four modular analog interfaces (FXO and/or FXS) in a PCI 3.3/5.0V form factor
  • Optional 128ms G.168 DSP Echo Cancellation
  • Fully compatible and integrated with Asterisk and Switchvox


  • Paid
  • Base card with DSP echo cancellation, no modules - $638 USD
  • Base card with software only echo cancellation, no modules - $379.50 USD


Digium's line of telephony cards are used by customers worldwide to build a variety of applications including gateways, PBXs, voicemail servers, conference bridges, and more. Simple integration with Digium's powerful Asterisk telephony toolkit allows users to quickly create any number of solutions.

The TDM2400 provides an industry standard 25-pair RJ-21 interfaces on a single card bracket to support up to 24 analog ports. This eliminates the need for multiple brackets, external dongles, or splitters. In doing so, the TDM2400 reduces part complexity, cable clutter, and points of failure.

The TDM2400 contains six module banks. Each bank supports up to four analog interfaces and may be filled either with one standard Digium quad station (S400M) or line/trunk (X400M) analog module.  The optional VPMADT032 hardware echo cancellation module provides 1024 taps (128 milliseconds) of G.168 compliant echo cancellation for superior echo cancellation on both types of analog interfaces. If the hardware echo cancellation module is not installed, the TDM2400 may be used in conjunction with Digium's High Performance Echo Cancellation (HPEC) software, a commercial and toll quality hybrid echo cancellation solution. Digium's HPEC provides 16ms to 128ms of selectable near-end ITU G.168 compliant echo cancellation in software.

Available parts and accessories -
1TDM2400PLF: 24 port modular analog PCI 3.3/5.0V card, no interfaces
1S400MF: Quad Channel Station (FXS) module
1X400MF: Quad Channel Trunk (FXO) module
1VPMADT032LF: Thirty-two (32) channel hardware echo cancellation module
1PWR2401BLF: One (1) external power supply bundle for analog card station (FXS) modules
1PWR2402BLF: Two (2) external power supply buncle for analog card station (FXS) modules
3113-00002: Six (6) Foot 50-pin male-to-femal cable for twenty-four (24) port analog cards
1ACC24PBO: Twenty-four (24) port RJ-11 breakout box for twenty-four (24) port analog cards

Supported Signalling Modes -
FXS Loop Start (Station modules), FXO Loop Start (Trunk modules)

Warranty -
Five years parts and labor including Digium's 30-day Exceptional Satisfaction Policy.

Physical -
Size: 12.28" x 4.2" x 0.68" (31.19 x 10.67 x 1.72 cm)
Weight: 5.8 oz (164.43 gm)

Interfaces -
Local Loop Access: RJ-21X

Environment -
Temperature: 0 to 50C (32 to 122F) operation; -20 to 65C (4 to 149F) storage
Humidity: 10 to 90% non-condensing

Power -
5.0V: 9 Watts, Maximum
12V: 20 Watts, Maximum (TDM2460E at 5REN), 0 Watts Minimum (no FXS modules)

Production Quality -
ISO 9001:2001

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Support Details

Digium provides case-based e-mail and phone support from Monday-Friday, 7am-8pm, CST/CDT (GM -6/-5).

In addition, Digium provides online documentation and knowledge base articles accessible from its website.

Other community-based support offerings are available including online mailing lists, an IRC channel and forums.

For links to each, please visit the Digium website

All new Digium telephony cards come with a 5 year warranty and are backed with Digium's Exceptional Satisfaction Policy. See Digium's website for more information about product warranties.

Support Contact Information

Digium, Inc


Digium®, Inc., the Asterisk® Company, created and is the innovative force behind Asterisk, the most widely used open source telephony software. Since its founding in 1999 by Mark Spencer, Digium has become the open source alternative to proprietary communication providers, with offerings that cost as much as 80 percent less. Digium offers Asterisk software free to the open source community and offers Switchvox, Digium's Unified Communications solution to power a broad family of products for small, medium and large businesses. The company's product line includes a wide range of telephony hardware and software to enable resellers and customers to implement turnkey VoIP systems or to design their own custom communications solutions. At Digium, we're changing the way businesses communicate.


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Digium Certified

Digium offers certification of selected products to ensure their interoperability with Certified Asterisk as well as Digium's other products. A Digium certified product provides an assurance of quality and interoperability of the product with Asterisk.