AccessSwitch Modules/Cards

The AccessSwitch (ISDN access switch) Model 60 and Model 200 supports the following plug-in modules:

  • MCU4

Some of these cards have been upgraded or expanded to newer configurations and higher capacities. Contact TKO for information on upgrades or replacements. Note the AccessSwitch Model 20 including the Intelligent Switch are stand-alone fixed configurations that do not accespt the above cards. These Model 20-based systems can be preconfigured with the specific modules required by an specific application at reduced cost.

Technical Support and Product Availability

At TKO, we offer technical support, diagnostic assistance and one of the largest inventories (worldwide) of upgrades and replacement parts for the AccessSwitch product lines including cards for the Model 60 and Model 200 AccessSwitches. We have many of these switching products in stock. Contact us for further information and availability.

AccessSwitch Modules/Cards

The Model 60 and Model 200 can be configured with a wide range of interface cards that provide synchronous interfaces, port or network distribution and both public and private network access (using T1, E1, PRI and/or BRI interfaces.) These multiple and customizable configurations can provide scalability for future growth and longevity of network investment.

You may also be interested in learning more about:


  • Integrated Services Digital Network (ISDN) interfaces for the Basic Rate Interface or BRI. These cards offer 4 - RJ45 interfaces in either U or S/T interfaces. They can be configured in multipoint (NI-1) or point-to-point mode (5ESS). In Point-to-Point mode, SPID use is optional, making these cards optimal for laboratory use as a development platform.


These cards/modules offer Integrated Services Digital Network (ISDN) interfaces for the Basic Rate Interface or BRI. They are newer versions of the BRIU and QBIU offering 8 - RJ45 interfaces in either U or S/T interfaces. The OBIU-S/T and OBIU-U modules provide network access to basic rate ISDN (when configured as trunks) or distribution of basic rate ISDN (when configured as ports). This flexibility offers a network manager the ability to distribute BRI services widely within an organization with only a few ISDN interfaces from a service provider and it also offers a lab or development environment the ability to test large scale Basic Rate ISDN products without procuring multiple lines from a local telco. Additionally, the lines themselves are highly configurable for Multipoint, Point-to-Point, AT&T 5ESS, DMS-100 and other configurations.


All of these cards are versions of the ISDN Network Processor that runs the AccessSwitch. In some cases, on older models, an INP card is paired with a timing interface card called a VTIU to enable calls on the switch. The INP3, INP4 and INP4D cards are various iterations of the same functioning module. This system module performs switch level call routing, translations, timing and offers a command interface. A system card is required for the slotted frames of the Model 60 and Model 200 AccessSwitches. Note: on older systems two system cards were required (INP and VTIU.)


This module enables 4 sites to join a video conference as a multipoint conference on an AccessSwitch.


These are T1 or E1 capacity network cards/modules. They support the Primary Rate ISDN interface, or PRI. Each card type has a different number of RJ45 interfaces: QDIU - 4 interfaces, DDIU - 2 interfaces, SEIU and PRIU - 1 interface.

The QDIU (North America Version), QEIU (Europe Version) provides input/output connections between high-speed digital networks and any other modules installed in the AccessSwitch frame. This means a switch can be configured with T1 or PRI network lines to a service provider such a telephone company and T1 or PRI lines (and even BRI lines or analog lines) can be distributed throughout a laboratory or to conference rooms and desktops. Many organizations use these switches in support of applications such as video conferencing where T1 or PRI network to a conference room is shared from a common network point in a centralized switchroom.

The AccessSwitch performs network translations to allow calls to transit from Basic Rate Interfaces to Primary Rate or T1 interfaces in both 56 Kbps and 64 Kbps speeds. Additionally, multiple line codings are supported such as D4/AMI coding and Extended Superframe (ESF).


The QRVX and DRVX modules provide the ability to bundle from 2 to 31 (inclusive), 56 Kbps or 64 Kbps channels to create a single wide band channel. This is commonly called bonding calls or Inverse Multiplexing calls.

The QRVX is configured with 4 interfaces, the DRVX has two and the SAIU has one. Each interface allows for two RS-366/V.35 or RS449 connections to devices such as routers or video conferencing systems. Additionally, a user can map T1 channels to these synchronous interfaces to create dedicated connections on a wide area network.

TKO Video Communications

TKO provides networking and video conferencing equipment as well as services and technical support for local, national and global communications networks. We distinguish ourselves from all vendors in our industry by providing high quality video conference and network outsourcing including technical consulting.

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