User's Manual

Table Of Contents
DIB-500 R4.1 Product description
Constituents
60 Installation, Operation and Service Manual 90DIB500R41IM_FCC02 99.1
3.1.9 Redundancy options for the DIB-500 R4.1 or the Base Station Func-
tion (BSF)
The ACCESSNET
®
-T IP provides numerous redundancy concepts to ensure the availa-
bility of services and performance features reliably even in exceptional situations. The
concept of designing system functions, network elements and connection routes redun-
dantly, may be required to ensure location reliability and system reliability. Location and
system reliability refers to the capability of the network to perpetuate the operation of
the overall system even if one location or route drops out completely or partially (due to
technical failure, natural phenomena, acts of terrorism etc.).
In combination with the flexible network architecture, the design of the engineered sys-
tem permits scalable redundancy solutions that take into account the different require-
ments for availability and capacity within an overall network.
The following sections describe the available redundancy options in conjunction with
the DIB-500 R4.1.
3.1.9.1 Redundant Main Control Channel (MCCH)
Irrespective of the number of carriers assigned to a radio cell of a base station, a radio
cell has only one main control channel (MCCH), via which the mobile stations receive
information on adjacent radio cells, for example.
Generally, the main control channel is sent via the first carrier of a base station. The
three remaining channels of this carrier and all the channels of all the other carriers are
used as voice channels. Up to three of the remaining channels on the first carrier can be
configured as secondary control channels (SCCH), which reduces the number of voice
channels accordingly.
Multiple radio cells per base station
If a base station has been assigned multiple radio cells, it is also possible to configure
secondary control channels on the first carriers of these radio cells. A base station can
be assigned a maximum of four radio cells, i.e. for base station with eight carriers, a
max. of 16 control channels are possible.
Table 3.27 Legend: DIB-500 R4.1 cavity variant with four cavity couplers for frequencies > 806 MHz
(front view)
No. Designation
1 Cavity coupler A
2 Cavity coupler B
3 Insulator for cavity coupler B
4 Star distributor
5 Cavity coupler C
6 Cavity coupler D