- It is an alternate timeline and the default setting for GURPS Traveller.
- The Lorenverse eventually converges (NOT merges) with the primary timeline of the OTU.
Library Data Referral Tree
1115 or 1116
Though there is considerable fuzzy ground on the date, what seems clear is that the Lorenverse divided from the OTU with the setting in motion of the events leading up to Dulinor's ship's destruction. If the event was a conspiracy, then the date is somewhat earlier (...perhaps late 1115) than if the gig simply malfunctioned. Certainly, the timeline split by 1116 in the latest. 
1201 - The Wave
As with the OTU, the Wave has been propagating from the Core for a long time. As a result, it arrives in Zhodani space in 1185 and the Imperium Eternal in 1201. It passes through Charted Space at the same times and with the same effects of biosphere devastation and destruction. 
The destruction of the Imperium Eternal is essentially complete by 1287 at the latest, since half of the Imperium is consumed by the Wave by this time. A few zones (centered on Rhylanor, Ilelish 2006, and Vland 1117) remain relatively unharmed. These areas, cut off from one another, mark the end of the Imperium, and must adjust to the loss of an entire empire's infrastructure.