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8. Unit-to-Unit Time-Tag Synchronisation
Multiple EtherSpaceLink units can be linked together to synchronize their internal clocks. This allows synchronised
outputs across multiple boxes and time tags to be the same across multiple units. The hardware option “S” is
required to provide the necessary SMA connectors on each unit that will be synchronised - e.g. MSR-RG408-MS.
Units are synchronised with a daisy-chain cable between them - using rear-panel SMA connectors J7 and J8.
These connectors are grouped in pairs (J1-J2, J3-J4, J5-J6 and J7-J8) with both connectors in a pair connected
together (loop-through). In the following illustrations connectors J7 and J8 are interchangeable.
Units to be synchronised are connected together by SMA-SMA cables, and 50 Ω terminators must be added at
each end of the chain. The two connectors in a pair are simply wired to each other and may be used as a loop-
through connection, or a resistor may be inserted into one of the connectors so that the other forms a terminated
connection.
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