User's Manual

Site Requirements 90DIB500R41SR_FCC02 – 99.1 17
DIB-500 R4.1 Product description
3 Product description
The Digital Indoor Base Station (DIB-500 R4.1) is used as a base station in
ACCESSNET
®
-T IP networks. The base station is responsible for radio coverage in a
defined radio coverage area. For this purpose, up to eight carriers are available
depending on the antenna coupling variant. It can thus provide as many as 32 radio
channels (four radio channels per carrier) for the communication of the mobile terminal
equipment, via which voice and data is/are transmitted in accordance with the TETRA
standard (Terrestrial Trunked Radio).
In addition, in networks with a distributed switching architecture, the DIB-500 R4.1 can
take on the routing function and thus act as a full system controller node. Moreover, fur-
ther functions are available; applications, for example, can be connected directly to the
ACCESSNET
®
-T IP by means of an IP connection.
The carriers are provided via the transceiver module TETRA Indoor Base Transceiver
(TIB) that can accommodate up to two carriers. Two TIB transceiver modules may be
incorporated in the equipment rack of the DIB-500 R4.1, thus providing four carriers.
From five carriers, a second equipment rack is used, which can also provide up to four
carriers.
Two TETRA antenna connections and one GPS antenna connection (Global Position-
ing System, GPS) are available for connecting antennas. Internally, the antennas are
coupled via the antenna coupling system. In the FlexibleTx variant, project-specific
external antenna coupling systems can be used for this purpose. For optimum reception
properties, antenna diversity is available.
Depending on the requirement, the ACS can provide the following antenna connection
variants:
| Hybrid
| Cavity
| High Power or
| FlexibleTx
For communicating with other base stations and with the IP Node (IPN) network ele-
ment, the DIB-500 R4.1 features Ethernet interfaces for linking to the IP transport net-
work.
If all the connections to the other network constituents break down during operation, the
DIB-500 R4.1 ensures radio operation within its own radio cell. If the DIB-500 R4.1 is
operated with a separate routing function in networks with a distributed switching archi-
tecture, the base station additionally collects call detail records (CDR).