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Digital Multiplexer

Supplier: Newtek Instruments

The K5302 DASY (Digital Access System) is a multiplexer for E1 and DS1 PCM lines.


Functional Description

It consists of a mainframe, a control unit (DRC) with display, a power supply and a number of input and output boards. DASY's main function is to couple single timeslots or PCM streams from an input board to one or more output boards.

With the latest Firm- and Software the DASY also supports the coupling of groups of timeslots, which will have exactly the same delay when coupled through the DASY.

The K5302 mainframe offers 13 slots to be used by input (DDM) or output (DDA) boards. Any combination of boards is possible, however, at least 1 input and 1 output board are required.

As each DDM module can handle up to 8 bi-directional PCM lines (either E1 or DS1), the configuration with 12 DDM boards and 1 DDA board would offer a maximum of 96 incoming PCM lines to be connected to the DASY.

The remaining DDA board would offer 4 Tx/Tx (8 Rx/Tx respectively) PCM lines. Each of the 2076 input timeslots (96*31, TS 0 to be handled separately) can be coupled to any of the output timeslots.

In order to increase the overall capacity of the system, several DASYs may be cascaded.

Fields of Application

The K5302 has been designed for various purposes:

  • To provide protocol testers with flexible and convenient access to a test environment with a huge number of links to be analyzed

Testing under lab conditions often means analyzing different interfaces. The configurations and thus the cabling often change. After connecting all possible PCM links to the multiplexer, DASY offers an easy way to couple the appropriate input links to the output.

  • To concentrate PCM signaling timeslots in order to enhance capabilities of protocol testers such as the K1205

The number of physical PCM interfaces of a protocol tester is usually limited. On the other hand, it is quite common that only very few (even just one) timeslots of a PCM link are used for signaling purposes.

By multiplexing single timeslots of several links to one output PCM link DASY offers a solution to solve this contradiction.

  • To duplicate signaling timeslots/PCM links in order to make the same signaling available for several users

It is not unusual for certain PCM links to be of interest to different users working with different analyzers. Connecting a number of protocol testers to a PCM link may have an impact (due to impedance reasons) on this link.

As the DASY offers a convenient way to duplicate single timeslots or even PCM links, it will make the same link available for several users without degrading the performance of the PCM links.

In order to avoid operating errors when setting couplings, a 4 digit PIN can be assigned to each output connector. If the password protection is turned on, users can only set/reset couplings on output connectors they have logged into before. To control the configuration of PINs, the user must have a Master PIN. Couplings may be stored in an EEPROM and will then automatically be restored after a power outage.

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Features & Benefits

  • Digital Multiplexer to Concentrate PCM Signaling Timeslots
  • Duplication of Timeslots Possible
  • Supports E1 and DS1
  • Can be Used and Configured Stand Alone
  • Powerful Application to Control Several DASYs Available (Directly via RS-232 or Remotely via Modem or LAN IEEE 803.2)
  • Clock Supply: Internal, External, PCM Link
  • Designed to Enhance the Capabilities of Protocol Testers
  • Support of time-synchronized couplings – allows coupling of logical links on Gb interface in GPRS networks


  • Provide Protocol Testers with Flexible and Convenient Access to Test Environment with Many Links to be Analyzed
  • Concentrate PCM Signaling Timeslots to Enhance Capabilities of Protocol Testers
  • Duplicate Signaling Timeslots/PCM Links to Make the Same Signaling Available for Several Users

Ordering Information  
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