Maintenance Guide

Cobham Wireless
idDAS Installation and Maintenance Guide 00109GU Rev. 2.0
Page | 56
4.4.5.2 RF Source Redundancy Driven Topologies MSDH Connections
This section describes the MSDH connections for an RF source redundancy driven topology. In this type of
topology, each string of idRUs is connected to two RF supply chains – one at each end of the cascade.
The MSDH units in each RF supply chain can located at a distance of up to 40 km from each other, and are
interconnected via an Ethernet connection.
For an overview and detailed description of the topology, refer to
Section 2.4.1. The topology is illustrated in Figure 4-13.
NOTE: The required setup parameters are defined during the commissioning procedure.
To connect a redundancy topology
1. MSDH to MSDH synchronization connections:
x Connect a CPRI port on the designated Primary MSDH to a
parallel CPRI port on the designated
Secondary MSDH. For example, CPRI Port-1 to CPRI Port-1.
x For order and clarity, it is recommended to use the lower numbered MSDH CPRI ports.
2. MTDI connections:
x Connect L1 or L2 port on the designated Primary MTDI to any CPRI port on the designated
Primary MSDH.
x Connect L1 or L2 port on the designated Secondary MTDI to any CPRI port on the designated
Secondary MSDH.
3. Connect each idRU ‘string’ as follows:
x Connect the Main CPRI port of the outer idRU adjacent to the Primary MSDH to any CPRI port
on the Primary MSDH.
x Connect the AUX CPRI port of the outer idRU adjacent to the Secondary MSDH to any CPRI
port on the Secondary MSDH.
Below is an example of an RF source redundant topology.
Figure 4-13. Physical Connections of the RF Source Redundant idDAS Systems