User's Manual

ITC2100-NA Operation and Service Manual Version 1.0

Page 15 of 129

The data to be transmitted is passed from a digital paging network controller directly to the

Master-ITC (ITC 0) employing a TCP/IP protocol. The Master ITC retransmits the received

alert messages. The digital pagers located in the radio coverage of the Master ITC are then

alerted. At the same time the Slave ITC's in alarm ring 1 receive the alert message. As

soon as the complete message has been received these ITC's then retransmit the mes-

sage to each other fully synchronised.

The pagers located in the radio coverage area of the Slave ITC's are also alerted. At the

same time the Slave ITC's in alarm ring 2 receive the alarm message and so on. In this way

the alarm travels through the complete coverage area of the system.

In addition to alarm the complete system or any individual ITC can be polled and configured

using specific system messages.

4.3.3 Multimaster Wave Network Configuration Using ITC2100-NA

The basic concept of Multimaster networks is that they permit the alerting of large regions.

Several interconnected sub-networks (e.g. several rural districts), each consisting of a wave

network with a Master ITC, receive the synchronised alarm signal which is triggered by an

interregional command and control centre. Due to multimaster operation, a large region

consisting of a combination of sub-networks, can be simultaneously alerted with an alarm

time that remains the same. The master ITC's in the sub-networks receive the alarm data

at the same point in time from the command and control centre. The Master ITC's transmit

their alarm messages bit synchronised at the prescribed transmission time which is syn-

chronised using a time reference (e.g. via GPS).

Fig. 4-2: Multimaster wave networks with ITC2100-NA

4.3.4 Emergency Operation in Multimaster Wave Networks with ITC2100-NA

If a failure occurs in the link from several Multimaster ITC's to the command and control

centre or there is a fault in the time reference, the transmission over the complete system is

carried out in an emergency mode via the remaining Master ITC links. In emergency mode

the information is transmitted from the command and control centre to these Master ITC's

Master

Landkreis B

Regionale

Leitstelle

Master

Regionale

Leitstelle

Master

Regionale

Leitstelle

Landkreis A

Landkreis C

Zentrale Leitstelle

IP (VPN,

Intranet,

RiFu-Netz,

etc.)