72 Connection
HBM QuantumX
5.2.14 Connecting more than 12 modules
123
1234
67891011
Hub
P3
P4
12
5
Displayed:
Total number of modules: 15
Total number of Hops: 12
QuantumX module
Longest chain to data sink (max. 12)
P3 = Port 3
Data sink
Fig.5.13: Example of a star topology with two chains and one hub
The number of modules connected in series (daisy chain) is limited to 12. If you want to
connect more modules (maximum 24), you must use hubs. Hubs are devices that connect
network chains together in star configurations. This connection mode is again limited to 14
hops.
A hop is the transition from one module to another (this means n−1 hops for n QuantumX
modules in a chain).
Depending on the connection situation, 1 to 2 hops are counted in one hub (see Fig.5.14).
To count the total number of hops, the longest chain to the data sink must be counted (worst
case).
In FireWire systems that consist of several hubs with several module series, only the hops of
the longest series are counted, the others are not taken into account.
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