This snazzy unit was an all in one solution!!
The model number is better known as DH-153Q1-A.
Introduced in 1987, the PDP-11/53 was a stripped-down low-end version of the PDP-11/73 , based on the KDJ11-D CPU module, with on-board memory, 2 integrated SLU's, and no cache. There was no UNIBUS equivalent.