I am not sure if I understand the question. What are you using for your timing source if not GPS? I assume your using PTP-Sync because you have multiple PTP650 links.
Are you using a sync source of Internal? This would occur if you were using PTP-SYNC with no GPS antenna, but with PTP-SYNC configured with GPS as the sync source using Strict holdover.
The maximum cable length with PTP-SYNC and PTP 650 is:
No more than 2 m (6.5 ft) between the AC+DC Power Injector (the PIDU) and the PTP-SYNC
No more than 100 m (328 ft) between the network equipment and the ODU
Other than this there are no restrictions specifically on the distance from the ODU to the PTP-SYNC, or the distance from the PTP-SYNC to the network equipment.
A 1 m Ethernet cable is supplied with the PTP-SYNC.