Maintenance Guide

Cobham Wireless
idDAS Installation and Maintenance Guide 00109GU Rev. 2.0
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2.3 Master Slave Topologies
This topology provides single source management for two cascaded MSDH units. A total of 36 idRUs are
supported for the installation that includes both MSDH units.
In this type of installation, the two MSDH units are cascaded and each MSDH unit interfaces to dedicated
idRUs or idRU cascades referred to as ‘strings’. Depending on the required capacity, the MSDH units can be
fed from either a single MTDI connected to the Master MSDH, or each MSDH may be fed from a dedicated
MTDI.
To implement single source management, the MSDH units are interconnected via one of the CPRI ports. One
of the units is configured as Master, and the other as Slave. All management is performed via the Master
MSDH. See section 4.4.5.1 for connections.
Figure 2-4. MSDH Master Slave Configuration
2.4 Redundancy Driven Topologies
The majority of public safety distributed coverage solutions require a high level of redundancy to ensure no
single point of failure results in a total loss of service which could have a detrimental impact to general
public safety and security.
Currently, idDAS supports two types of redundancy driven topologies:
x RF source redundancy, in which redundancy is provided for the RF source chain feeding the remote
units. These include the BTS farms, MTDI elements, and MSDH elements.
x Dual-system redundancy, in which redundancy is provided for the RF source as well as the remote units.
Up to 36 idRUs