User Manual

MBF, Multi Band Repeater

PRODUCT DESCRIPTION AND USER'S MANUAL

3.9 Access to the System

Important Generic Information

Axell Wireless repeaters and OMUs can be configured in three different ways as regards

communication and control. They can be “stand-alone units”, “node masters” or “slaves”.

Stand-alone units do not control any other unit or take control from any other unit. All communication

with a stand-alone unit needs to be made directly with the unit – either locally or remotely via a modem

or Ethernet. Most stand-alone units are equipped with Ethernet and/or a modem for this purpose.

Node Masters keep track of the slaves that are connected to it. It is the single point of contact for alarm

reports and for heart beats in the entire system, and communicates with the AEM. All configuration and

control of all units in the network go through this Node Master. Most stand-alone units are equipped

with Ethernet and/or a modem for this purpose.

Slaves are linked to a node master. Slaves do not have modems but instead all data is transferred to the

master where it is distributed further to the AEM.

An OMU-Repeater system can be designed using repeaters that operate as slaves to the OMU or as stand

alone units regarding communication, configuration, alarms etc. Either all communication is handled by the

OMU that acts as a node master and the repeaters are slaves, or each repeater (and the OMU) handles this

communications and reporting separately.

The most common configuration is the master-slave set up which has several advantages:

 All nodes can be reached from any node in the system. An operator can log in from any node in the

system and access all parameters in all nodes, including those in the OMU

 Only one modem is needed for remote communication and configuration of the whole system

 Since the communication runs on the same fibre as the RF, this arrangement gives a reliable supervision

of the radio link. If communication between the OMU and a repeater is broken, an alarm can be

generated immediately.

Several users at a time can be logged on to the system, for instance one locally via the RS232 interface and

one remotely via modem or Ethernet. Only one user at a time can be logged in remotely.

Note! If the network has an OMU from an earlier generation

, there are some limitations of what can be

accessed via a local login to a slave repeater.

3.9.1 Local Access

Local access is achieved via a RS232 interface to the LMT port in the repeater or the OMU. This port is

accessible on the front of the OMU and inside the repeater.

3.9.2 Remote Access

Remote access is achieved via modem or via Ethernet. Different types of modems are supported, for example

GSM, GSM-R and PSTN.

The modem is either placed on the Control Module or as a separate unit. When cascaded OMUs are used, the

modem is placed in the OMU unit that holds the Control Module. Ethernet connection is available on the

Control Module.

The earlier version of the OMU was called HUB.