Product manual

System description, Radio exchange boards

Technical Product Manual - DCT1800-GAP

TD 92093 (1/LZBNB 103 108 R4D) / 2006-03-09/ Ver.C

Fig. 9 Line Termination Unit (LTU)

4.9 Digital Trunk Unit – DTU

To use the DTU with CAS+ firmware in a GAP system, it can be connected to an MD110, Meridian 1

or Succession 1000M.

The digital trunk unit provides the digital interface between the PBX and the radio exchange. The

physical connection with the PBX is established via two coaxial or twisted pair cables.

Every DTU board contains 2 Digital Trunk Circuits (DTC, see figure 10), each equipped with identical

firmware. Both DTCs support the Channel Associated Signalling (CAS) interface.

The CAS interface provides 30 fixed communication channels to which 30 cordless phones are

assigned. In this case a DTU board can handle 60 cordless phones.

LTU and DTU boards with CAS interfaces can be operational at the same time in a DCT1800-GAP

system.

CCS firmware (S2-protocol) can be connected to Ascotel I5 and higher with AMI software, or EADS

6500 PBXs.

Fig. 10 Digital Trunk Unit (DTU)

4.10 Modular Cabinet Connection Board – MCCB

The modular cabinet connection board provides connectors for a personal computer, a printer, 3 DTU

boards, R-button earth connection for 7 LTU boards, base station powering via 7 CLU/CLU-S boards or

SLU boards and a general alarm (via relays). The MCCB is located at the bottom of the modular cabinet.

Peripheral

LTC

SPC

LTC

SPC

LTC

SPC

LTC

Analogue

telephone

line

Analogue

telephone

line

DTC2

DTC1

L2 L1BC

Channels

31- 60

Channels

1- 30

2 Mbit/s

trunk

2 Mbit/s

trunk