On a PTP 650, it is possible to use the Network Indoor Unit (NIDU) for T1/E1 circuits simultaneously with the PTP-SYNC module. So a link can be TDD synchronized and deliver TDM traffic at the same time. The correct sequence to for the connection is:
NIDU - PIDU – SYNC - LPU - LPU - ODU <-----> ODU - LPU - LPU - SYNC - PIDU - NIDU
PIDU is the AC+DC Power Injector
NIDU is the Network Indoor Unit
SYNC is the PTP-SYNC module
LPU is the Lightning Protection Unit
ODU is the Outdoor Unit